1
|
Dengler L, Meier J, Klingl A, Nißl L, Bellack A, Grohmann D, Rachel R, Huber H. A novel interdomain consortium from a Costa Rican oil well composed of Methanobacterium cahuitense sp. nov. and Desulfomicrobium aggregans sp. nov. Arch Microbiol 2023; 205:189. [PMID: 37055657 PMCID: PMC10102059 DOI: 10.1007/s00203-023-03533-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2023] [Revised: 03/20/2023] [Accepted: 03/31/2023] [Indexed: 04/15/2023]
Abstract
A novel interdomain consortium composed of a methanogenic Archaeon and a sulfate-reducing bacterium was isolated from a microbial biofilm in an oil well in Cahuita National Park, Costa Rica. Both organisms can be grown in pure culture or as stable co-culture. The methanogenic cells were non-motile rods producing CH4 exclusively from H2/CO2. Cells of the sulfate-reducing partner were motile rods forming cell aggregates. They utilized hydrogen, lactate, formate, and pyruvate as electron donors. Electron acceptors were sulfate, thiosulfate, and sulfite. 16S rRNA sequencing revealed 99% gene sequence similarity of strain CaP3V-M-L2AT to Methanobacterium subterraneum and 98.5% of strain CaP3V-S-L1AT to Desulfomicrobium baculatum. Both strains grew from 20 to 42 °C, pH 5.0-7.5, and 0-4% NaCl. Based on our data, type strains CaP3V-M-L2AT (= DSM 113354 T = JCM 39174 T) and CaP3V-S-L1AT (= DSM 113299 T = JCM 39179 T) represent novel species which we name Methanobacterium cahuitense sp. nov. and Desulfomicrobium aggregans sp. nov.
Collapse
Affiliation(s)
- Linda Dengler
- Institute of Microbiology and Archaea Centre, University of Regensburg, Universitätsstrasse 31, 93053, Regensburg, Germany.
| | - Julia Meier
- Institute of Microbiology and Archaea Centre, University of Regensburg, Universitätsstrasse 31, 93053, Regensburg, Germany
| | - Andreas Klingl
- Plant Development and Electron Microscopy, Biocenter LMU Munich, Planegg-Martinsried, Germany
| | - Laura Nißl
- Institute of Microbiology and Archaea Centre, University of Regensburg, Universitätsstrasse 31, 93053, Regensburg, Germany
| | - Annett Bellack
- Institute of Microbiology and Archaea Centre, University of Regensburg, Universitätsstrasse 31, 93053, Regensburg, Germany
| | - Dina Grohmann
- Institute of Microbiology and Archaea Centre, University of Regensburg, Universitätsstrasse 31, 93053, Regensburg, Germany
| | - Reinhard Rachel
- Centre for Electron Microscopy, Faculty for Biology and Preclinical Medicine, University of Regensburg, Universitätsstrasse 31, 93053, Regensburg, Germany
| | - Harald Huber
- Institute of Microbiology and Archaea Centre, University of Regensburg, Universitätsstrasse 31, 93053, Regensburg, Germany.
| |
Collapse
|
2
|
Dengler L, Meier J, Grünberger F, Bellack A, Rachel R, Grohmann D, Huber H. Methanofollis propanolicus sp. nov., a novel archaeal isolate from a Costa Rican oil well that uses propanol for methane production. Arch Microbiol 2022; 204:554. [PMID: 35962867 PMCID: PMC9375759 DOI: 10.1007/s00203-022-03152-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2022] [Revised: 06/28/2022] [Accepted: 07/27/2022] [Indexed: 11/29/2022]
Abstract
A novel methanogenic strain, CaP3V-MF-L2AT, was isolated from an exploratory oil well from Cahuita National Park, Costa Rica. The cells were irregular cocci, 0.8–1.8 μm in diameter, stained Gram-negative and were motile. The strain utilized H2/CO2, formate and the primary and secondary alcohols 1-propanol and 2-propanol for methanogenesis, but not acetate, methanol, ethanol, 1-butanol or 2-butanol. Acetate was required as carbon source. The novel isolate grew at 25–40 °C, pH 6.0–7.5 and 0–2.5% (w/v) NaCl. 16S rRNA gene sequence analysis revealed that the strain is affiliated to the genus Methanofollis. It shows 98.8% sequence similarity to its closest relative Methanofollis ethanolicus. The G + C content is 60.1 mol%. Based on the data presented here type strain CaP3V-MF-L2AT (= DSM 113321T = JCM 39176T) represents a novel species, Methanofollis propanolicus sp. nov.
Collapse
Affiliation(s)
- Linda Dengler
- Institute of Microbiology and Archaea Centre, University of Regensburg, Universitaetsstrasse 31, 93053, Regensburg, Germany
| | - Julia Meier
- Institute of Microbiology and Archaea Centre, University of Regensburg, Universitaetsstrasse 31, 93053, Regensburg, Germany
| | - Felix Grünberger
- Institute of Microbiology and Archaea Centre, University of Regensburg, Universitaetsstrasse 31, 93053, Regensburg, Germany
| | - Annett Bellack
- Institute of Microbiology and Archaea Centre, University of Regensburg, Universitaetsstrasse 31, 93053, Regensburg, Germany
| | - Reinhard Rachel
- Electron Microscopy Center, University of Regensburg, Universitaetsstrasse 31, 93053, Regensburg, Germany
| | - Dina Grohmann
- Institute of Microbiology and Archaea Centre, University of Regensburg, Universitaetsstrasse 31, 93053, Regensburg, Germany
| | - Harald Huber
- Institute of Microbiology and Archaea Centre, University of Regensburg, Universitaetsstrasse 31, 93053, Regensburg, Germany.
| |
Collapse
|
3
|
Cario A, Oliver GC, Rogers KL. Characterizing the Piezosphere: The Effects of Decompression on Microbial Growth Dynamics. Front Microbiol 2022; 13:867340. [PMID: 35663870 PMCID: PMC9157427 DOI: 10.3389/fmicb.2022.867340] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2022] [Accepted: 04/20/2022] [Indexed: 12/04/2022] Open
Abstract
The extent to which the full diversity of the subsurface microbiome can be captured via cultivation is likely hindered by the inevitable loss of cellular viability from decompression during sampling, enrichment, and isolation. Furthermore, the pressure tolerance of previously isolated strains that span surface and subsurface ecosystems can shed light into microbial activity and pressure adaptation in these transition zones. However, assessments of the effects of elevated pressure on the physiology of piezotolerant and piezosensitive species may be biased by high-pressure enrichment techniques. Here, we compared two high-pressure cultivation techniques-one that requires decompression of the whole cultures during sampling and one that employs the previously described isobaric PUSH devices-to explore the effects of repeated decompression during incubations performed to characterize isolates from deep environments. Two model sulfate-reducing prokaryotes were used to test the effects of decompression/repressurization cycles on growth rates, cell yields, and pressure tolerance. The mesophilic bacterium Desulfovibrio salexigens was cultivated from 0.1 to 50 MPa, and the hyperthermophilic archaeon Archaeoglobus fulgidus was tested from 0.1 to 98 MPa. For both cultivation methods, D. salexigens showed exponential growth up to 20 MPa, but faster growth rates were observed for isobaric cultivation. Furthermore, at 30 MPa minor growth was observed in D. salexigens cultures only for isobaric conditions. Isobaric conditions also extended exponential growth of A. fulgidus to 60 MPa, compared to 50 MPa when cultures were decompressed during subsampling. For both strains, growth rates and cell yields decreased with increasing pressures, and the most pronounced effects of decompression were observed at the higher end of the pressure ranges. These results highlight that repeated decompression can have a significant negative impact on cell viability, suggesting that decompression tolerance may depend on habitat depth. Furthermore, sampling, enrichment, and cultivation in isobaric devices is critical not only to explore the portion of the deep biosphere that is sensitive to decompression, but also to better characterize the pressure limits and growth characteristics of piezotolerant and piezosensitive species that span surface and subsurface ecosystems.
Collapse
Affiliation(s)
- Anaïs Cario
- Department of Earth and Environmental Sciences, Rensselaer Polytechnic Institute, Troy, NY, United States
| | - Gina C. Oliver
- Department of Earth and Environmental Sciences, Rensselaer Polytechnic Institute, Troy, NY, United States
| | - Karyn L. Rogers
- Department of Earth and Environmental Sciences, Rensselaer Polytechnic Institute, Troy, NY, United States
- Rensselaer Astrobiology Research and Education Center, Rensselaer Polytechnic Institute, Troy, NY, United States
| |
Collapse
|
4
|
Effect of Sodium on Methanogens in a Two-Stage Anaerobic System. APPLIED SCIENCES-BASEL 2022. [DOI: 10.3390/app12030956] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
Abstract
This study evaluated the effects of sodium on anaerobic biomass from the second-stage reactor of a two-stage anaerobic digester. The results indicated that methanogens showed a relatively high sodium tolerance of 2.4 g Na+ L−1. Microbial community analysis showed that viable Methanomicrobiales was the most abundant population by a combined propidium monoazide cross-linking quantitative polymerase chain reaction technique. There was a population shift towards higher abundance of Thermotoga (0.02%), Clostridium (2.50%) and Methanoculleus (13.80%). Biomass activity in relation to increased sodium concentrations was investigated with the adenosine triphosphate test coupled with extracellular polymeric substances measurement. The results showed biomass activity decreased from 33 to 16 µg g−1 volatile suspended solids as sodium concentrations increased from 1.3 to 9.1 g Na+ L−1. Higher EPS production, particularly a greater predominance of carbohydrates, was stimulated by higher sodium concentrations. This study provides insights into the superiority of sodium tolerance of two-stage anaerobic digester in compared with a single-stage anaerobic system.
Collapse
|
5
|
Empower C1: Combination of Electrochemistry and Biology to Convert C1 Compounds. ADVANCES IN BIOCHEMICAL ENGINEERING/BIOTECHNOLOGY 2021; 180:213-241. [PMID: 34518909 DOI: 10.1007/10_2021_171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
The idea to somehow combine electrical current and biological systems is not new. It was subject of research as well as of science fiction literature for decades. Nowadays, in times of limited resources and the need to capture greenhouse gases like CO2, this combination gains increasing interest, since it might allow to use C1 compounds and highly oxidized compounds as substrate for microbial production by "activating" them with additional electrons. In this chapter, different possibilities to combine electrochemistry and biology to convert C1 compounds into useful products will be discussed. The chapter first shows electrochemical conversion of C1 compounds, allowing the use of the product as substrate for a subsequent biosynthesis in uncoupled systems, further leads to coupled systems of biology and electrochemical conversion, and finally reaches the discipline of bioelectrosynthesis, where electrical current and C1 compounds are directly converted by microorganisms or enzymes. This overview will give an idea about the potentials and challenges of combining electrochemistry and biology to convert C1 molecules.
Collapse
|
6
|
Huang C, Liu Q, Wang H, Gao L, Hou YN, Nan J, Ren N, Li ZL. Influence of microbial spatial distribution and activity in an EGSB reactor under high- and low-loading denitrification desulfurization. ENVIRONMENTAL RESEARCH 2021; 195:110311. [PMID: 33130169 DOI: 10.1016/j.envres.2020.110311] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2020] [Revised: 09/19/2020] [Accepted: 10/02/2020] [Indexed: 06/11/2023]
Abstract
To characterize the impact of reactor configuration and influent loading on elemental sulphur (S0) recovery during denitrification desulfurization, a laboratory-scale expanded granular sludge bed (EGSB) reactor was established under two influent acetate/nitrate/sulphide loadings; the water flow velocity, microbial community, and functional genes at different heights were investigated. There was no S0 generated when acetate/nitrate/sulphide loadings were set to 0.95/0.60/1.05 kg/m3.d (low-loading). Furthermore, there were no typical denitrifying sulphide oxidizing bacteria under this condition, and Syntrophobacter, Anaerolineaceae genera were predominant in the reactor. As the influent loading was doubled (high-loading), S0 recovery increased to 87%; the bacterial distribution was relatively homogeneous with sulphide oxidation genera (Thauera) being predominant. Neither nirK nor sqr genes were detected in the low-loading sample at a height of 50 cm. The sqr/sox ratios of low-loading stage were 2.50 (10 cm), 0.94 (30 cm), and 0 (50 cm), and the ratios of the high-loading stage were 1.38 (10 cm), 1.33 (30 cm), and 1.08 (50 cm). A hydrodynamics analysis indicated that the water flow velocity was homogenous throughout the reactor. Appropriate reactor configuration and operation parameters play an important role in the efficient regulation of S0 recovery during denitrification desulfurization.
Collapse
Affiliation(s)
- Cong Huang
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, China; National Technology Innovation Center of Synthetic Biology, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China; Key Laboratory of Environmental Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
| | - Qian Liu
- Research Center for Eco-environmental Engineering, Dongguan University of Technology, Dongguan, 523808, China
| | - Hong Wang
- College of Chemical Engineering, Qinghai University, Xining, 810016, China
| | - Lei Gao
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, China
| | - Ya-Nan Hou
- National Technology Innovation Center of Synthetic Biology, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China
| | - Jun Nan
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, China
| | - Nanqi Ren
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, China; National Technology Innovation Center of Synthetic Biology, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, 300308, China
| | - Zhi-Ling Li
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, China.
| |
Collapse
|
7
|
Damodara Kannan A, Evans P, Parameswaran P. Long-term microbial community dynamics in a pilot-scale gas sparged anaerobic membrane bioreactor treating municipal wastewater under seasonal variations. BIORESOURCE TECHNOLOGY 2020; 310:123425. [PMID: 32361646 DOI: 10.1016/j.biortech.2020.123425] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2020] [Revised: 03/31/2020] [Accepted: 04/01/2020] [Indexed: 06/11/2023]
Abstract
This study evaluates the microbial community development in the suspended sludge within a pilot-scale gas sparged Anaerobic membrane bioreactor (AnMBR) under ambient conditions, as well as understand the influence of microbial signatures in the influent municipal wastewater on the bioreactor using amplicon sequence analysis. The predominant bacterial phyla comprised of Bacteroidetes, Proteobacteria, Firmicutes, and Chloroflexi demonstrated resiliency with ambient temperature operation over a period of 472 days. Acetoclastic Methanosaeta were predominant during most of the AnMBR operation. Beta diversity analysis indicated that the microbial communities present in the influent wastewater did not affect the AnMBR core microbiome. Syntrophic microbial interactions were evidenced by the presence of the members from Synergistales, Anaerolineales, Clostridiales, and Syntrophobacterales. The proliferation of sulfate reducing bacteria (SRB) along with sulfate reduction underscored the competition of SRB in the AnMBR. Operational and environmental variables did not greatly alter the core bacterial population based on canonical correspondence analysis.
Collapse
Affiliation(s)
- Arvind Damodara Kannan
- Department of Civil Engineering, Kansas State University, Fiedler Hall, 1701C Platt Street, Manhattan, KS 66506, USA
| | - Patrick Evans
- CDM Smith, 14432, SE Eastgate Way, Suite 100, Bellevue, WA 98007, USA
| | - Prathap Parameswaran
- Department of Civil Engineering, Kansas State University, Fiedler Hall, 1701C Platt Street, Manhattan, KS 66506, USA.
| |
Collapse
|
8
|
Abstract
Gold amalgam microelectrodes (GAMEs) have been characterized and successfully calibrated to measure >1.5 mM (30 mg L−1) sulfide in artificial wastewater (AWW) using cathodic stripping voltammetry (CSV). Microbial sulfide generation in two types of AWW was traced. Artificial wastewater type 1 (AWW1) held the potential for almost 50% conversion of sulfur compounds at a maximum rate of ~4.3 ± 0.5 µM h−1 while AWW 2 held a potential for 75–100% conversion at a rate of 165 µM h−1. In addition, the GAMEs were thoroughly examined during fabrication, maturation, and aging. An earlier described plating method was found to result in varying electrode surfaces due to excess mercury deposition and, therefore, deviating stripping signals. The limited shelf life of GAMEs has been proposed previously. This study shows the extent of electrode surface changes during amalgam formation and the wear and tear of application. As a result, suggestions to optimize fabrication and application are discussed to provide reliable measurements and proceed toward a future commercialization.
Collapse
|
9
|
Oliver GC, Cario A, Rogers KL. Rate and Extent of Growth of a Model Extremophile, Archaeoglobus fulgidus, Under High Hydrostatic Pressures. Front Microbiol 2020; 11:1023. [PMID: 32595611 PMCID: PMC7303961 DOI: 10.3389/fmicb.2020.01023] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2020] [Accepted: 04/27/2020] [Indexed: 11/28/2022] Open
Abstract
High hydrostatic pressure (HHP) batch cultivation of a model extremophile, Archaeoglobus fulgidus type strain VC-16, was performed to explore how elevated pressures might affect microbial growth and physiology in the deep marine biosphere. Though commonly identified in high-temperature and high-pressure marine environments (up to 2-5 km below sea level, 20-50 MPa pressures), A. fulgidus growth at elevated pressure has not been characterized previously. Here, exponential growth of A. fulgidus was observed up to 60 MPa when supported by the heterotrophic metabolism of lactate oxidation coupled to sulfate reduction, and up to 40 MPa for autotrophic CO2 fixation coupled to thiosulfate reduction via H2. Maximum growth rates for this heterotrophic metabolism were observed at 20 MPa, suggesting that A. fulgidus is a moderate piezophile under these conditions. However, only piezotolerance was observed for autotrophy, as growth rates remained nearly constant from 0.3 to 40 MPa. Experiments described below show that A. fulgidus continues both heterotrophic sulfate reduction and autotrophic thiosulfate reduction nearly unaffected by increasing pressure up to 30 MPa and 40 MPa, respectively. As these pressures encompass a variety of subsurface marine environments, A. fulgidus serves as a model extremophile for exploring the effects of elevated pressure on microbial metabolisms in the deep subsurface. Further, these results exemplify the need for high-pressure cultivation of deep-sea and subsurface microorganisms to better reflect in situ physiological conditions.
Collapse
Affiliation(s)
- Gina C. Oliver
- Department of Earth and Environmental Sciences, Rensselaer Polytechnic Institute, Troy, NY, United States
| | - Anaïs Cario
- Department of Earth and Environmental Sciences, Rensselaer Polytechnic Institute, Troy, NY, United States
| | - Karyn L. Rogers
- Department of Earth and Environmental Sciences, Rensselaer Polytechnic Institute, Troy, NY, United States
- Rensselaer Astrobiology Research and Education Center, Rensselaer Polytechnic Institute, Troy, NY, United States
| |
Collapse
|
10
|
Paulo LM, Castilla-Archilla J, Ramiro-Garcia J, Escamez-Picón JA, Hughes D, Mahony T, Murray M, Wilmes P, O'Flaherty V. Microbial Community Redundancy and Resilience Underpins High-Rate Anaerobic Treatment of Dairy-Processing Wastewater at Ambient Temperatures. Front Bioeng Biotechnol 2020; 8:192. [PMID: 32232038 PMCID: PMC7082317 DOI: 10.3389/fbioe.2020.00192] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2019] [Accepted: 02/27/2020] [Indexed: 11/25/2022] Open
Abstract
High-rate anaerobic digestion (AD) is a reliable, efficient process to treat wastewaters and is often operated at temperatures exceeding 30°C, involving energy consumption of biogas in temperate regions, where wastewaters are often discharged at variable temperatures generally below 20°C. High-rate ambient temperature AD, without temperature control, is an economically attractive alternative that has been proven to be feasible at laboratory-scale. In this study, an ambient temperature pilot scale anaerobic reactor (2 m3) was employed to treat real dairy wastewater in situ at a milk processing plant, at organic loading rates of 1.3 ± 0.6 to 10.6 ± 3.7 kg COD/m3/day and hydraulic retention times (HRT) ranging from 36 to 6 h. Consistent high levels of COD removal efficiencies, ranging from 50 to 70% for total COD removal and 70 to 84% for soluble COD removal, were achieved during the trial. Within the reactor biomass, stable active archaeal populations were observed, consisting mainly of Methanothrix (previously Methanosaeta) species, which represented up to 47% of the relative abundant active species in the reactor. The decrease in HRT, combined with increases in the loading rate had a clear effect on shaping the structure and composition of the bacterial fraction of the microbial community, however, without affecting reactor performance. On the other hand, perturbances in influent pH had a strong impact, especially when pH went higher than 8.5, inducing shifts in the microbial community composition and, in some cases, affecting negatively the performance of the reactor in terms of COD removal and biogas methane content. For example, the main pH shock led to a drop in the methane content to 15%, COD removals decreased to 0%, while the archaeal population decreased to ~11% both at DNA and cDNA levels. Functional redundancy in the microbial community underpinned stable reactor performance and rapid reactor recovery after perturbations.
Collapse
Affiliation(s)
- Lara M Paulo
- Microbiology, School of Natural Sciences and Ryan Institute, NUI Galway, Galway, Ireland.,Dairy Processing Technology Centre (DPTC), Limerick, Ireland
| | - Juan Castilla-Archilla
- Microbiology, School of Natural Sciences and Ryan Institute, NUI Galway, Galway, Ireland.,Dairy Processing Technology Centre (DPTC), Limerick, Ireland
| | - Javier Ramiro-Garcia
- Luxembourg Centre for Systems Biomedicine, University of Luxembourg, Esch-sur-Alzette, Luxembourg
| | - José Antonio Escamez-Picón
- Microbiology, School of Natural Sciences and Ryan Institute, NUI Galway, Galway, Ireland.,Dairy Processing Technology Centre (DPTC), Limerick, Ireland
| | - Dermot Hughes
- Microbiology, School of Natural Sciences and Ryan Institute, NUI Galway, Galway, Ireland.,NVP Energy Ltd., Galway Technology & Business Centre, Galway, Ireland
| | - Thérèse Mahony
- Microbiology, School of Natural Sciences and Ryan Institute, NUI Galway, Galway, Ireland.,Dairy Processing Technology Centre (DPTC), Limerick, Ireland
| | - Michael Murray
- NVP Energy Ltd., Galway Technology & Business Centre, Galway, Ireland
| | - Paul Wilmes
- Luxembourg Centre for Systems Biomedicine, University of Luxembourg, Esch-sur-Alzette, Luxembourg
| | - Vincent O'Flaherty
- Microbiology, School of Natural Sciences and Ryan Institute, NUI Galway, Galway, Ireland.,Dairy Processing Technology Centre (DPTC), Limerick, Ireland
| |
Collapse
|
11
|
Baek G, Kim J, Kim J, Lee C. Individual and combined effects of magnetite addition and external voltage application on anaerobic digestion of dairy wastewater. BIORESOURCE TECHNOLOGY 2020; 297:122443. [PMID: 31786039 DOI: 10.1016/j.biortech.2019.122443] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Revised: 11/13/2019] [Accepted: 11/15/2019] [Indexed: 06/10/2023]
Abstract
Direct interspecies electron transfer (DIET) between exoelectrogenic fatty acid oxidizers and electrotrophic methanogens plays an important role in keeping the overall anaerobic digestion (AD) process well-balanced. This study examined the individual and combined effects of two different DIET-promoting strategies, i.e., magnetite addition (20 mM Fe) and external voltage application (0.6 V), in continuous digesters treating dairy wastewater. Although the strategies were both effective in enhancing the process performance and stability, adding magnetite had a much greater stimulatory effect. External voltage contributed little to the methane yield, and the digester with magnetite addition alone achieved stable performance, comparable to that of the digester where both strategies were combined, at short hydraulic retention times (down to 7.5 days). Diverse (putative) electroactive microorganisms were significantly enriched under DIET-promoting conditions, particularly with magnetite addition. The overall results suggest that magnetite addition could effectively enhance AD performance and stability by promoting DIET-based electro-syntrophic microbial interactions.
Collapse
Affiliation(s)
- Gahyun Baek
- School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Eonyang-eup, Ulju-gun, Ulsan 44919, Republic of Korea
| | - Jinsu Kim
- School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Eonyang-eup, Ulju-gun, Ulsan 44919, Republic of Korea
| | - Jaai Kim
- School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Eonyang-eup, Ulju-gun, Ulsan 44919, Republic of Korea
| | - Changsoo Lee
- School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Eonyang-eup, Ulju-gun, Ulsan 44919, Republic of Korea.
| |
Collapse
|
12
|
Genome-Centered Metagenomics Analysis Reveals the Microbial Interactions of a Syntrophic Consortium during Methane Generation in a Decentralized Wastewater Treatment System. APPLIED SCIENCES-BASEL 2019. [DOI: 10.3390/app10010135] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The application of anaerobic digestors to decentralized wastewater treatment systems (DWTS) has gained momentum worldwide due to their ease of operation, high efficiency, and ability to recycle wastewater. However, the microbial mechanisms responsible for the high efficiency and ability of DWTS to recycle wastewater are still unclear. In this study, the microbial community structure and function of two different anaerobic bioreactors (a primary sludge digestor, PSD, and anaerobic membrane bioreactor, AnMBR) of a DWTS located in Germany was investigated using 16S rRNA gene amplicon and metagenomic sequencing, respectively. The results showed that the microbial community structure was remarkably different in PSD and AnMBR. Methanobacteriaceae and Syntrophaceae were identified as the families that significantly differed in abundance between these two bioreactors. We also used genome-centered metagenomics to predict the microbial interactions and methane-generating pathway, which yielded 21 near-complete assembled genomes (MAGs) (average completeness of 93.0% and contamination of 2.9%). These MAGs together represented the majority of the microbial community. MAGs affiliated with methanogenic archaea, including Methanobacterium sp., Methanomicrobiales archaea, Methanomassiliicoccales archaea, and Methanosaeta concilii, were recruited, along with other syntrophic bacterial MAGs associated with anaerobic digestion. Key genes encoding enzymes involved in specific carbohydrate-active and methanogenic pathways in MAGs were identified to illustrate the microbial functions and interactions that occur during anaerobic digestion in the wastewater treatment. From the MAG information, it was predicted that bacteria affiliated with Bacteroidetes, Prolixibacteraceae, and Synergistaceae were the key bacteria involved in anaerobic digestion. In the methane production step, Methanobacterium sp. performed hydrogenotrophic methanogenesis, which reduced carbon dioxide to methane with hydrogen as the primary electron donor. Taken together, our findings provide a clear understanding of the methane-generating pathways and highlight the syntrophic interactions that occur during anaerobic digestion in DWTS.
Collapse
|
13
|
Guermazi-Toumi S, Chouari R, Sghir A. Molecular analysis of methanogen populations and their interactions within anaerobic sludge digesters. ENVIRONMENTAL TECHNOLOGY 2019; 40:2864-2879. [PMID: 29560816 DOI: 10.1080/09593330.2018.1455747] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2017] [Accepted: 03/15/2018] [Indexed: 06/08/2023]
Abstract
Knowledge of archaeal population structure, function and interactions is of great interest for a deeper understanding of the anaerobic digestion step in wastewater treatment process, that represents a bottle neck in the optimization of digesters performance. Although culture-independent techniques have enabled the exploration of archaeal population in such systems, their population dynamics and interactions still require further investigation. In the present study, 2646 almost full archaeal 16S rRNA gene sequences retrieved from 22 anaerobic digesters located worldwide were analyzed and classified into 83 Operational Taxonomic Units (OTUs) for Euryarchaeotes and 2 OTUs for Crenarchaeotes. Among the Euryarchaeotes, Methanosarcinales represent the predominant archaeal population (47.5% of total sequences), followed by the ARC I (WSA2) lineage (25.3%), Methanomicrobiales (19.9%) and Methanobacteriales (1.9%). Theses lineages are predominant in nine, five, two and one digesters respectively. However, the remaining 5 digesters show no predominance of any methanogenic group. According to the predominance of theses lineages, 5 digester profiles were distinguished. This study revealed a clear interaction between the 4 methanogenic lineages. A core of 12 OTUs represented by five, four, two and one OTU for Methanosarcinales, Methanomicrobiales, ARC I and Methanobacteriales respectively were quantitatively abundant in at least 50% of the analyzed digesters. 16S rRNA targeted hybridization oligonucleotide probes targeting the predominant OTUs are being developed to follow their population dynamics under various parameters.
Collapse
Affiliation(s)
- Sonda Guermazi-Toumi
- a Faculté des Sciences de Gafsa, Université de Gafsa , Gafsa , Tunisie
- b Laboratoire de recherche Toxicologie-Microbiologie Environnementale et Santé (LR17ES06), Faculté des Sciences de Sfax, Université de Sfax , Sfax , Tunisie
| | - Rakia Chouari
- c Faculté des Sciences de Bizerte, UR11ES32 Plant Toxicology and Molecular Biology of Microorganims, Université de Carthage , Bizerte , Tunisie
| | - Abdelghani Sghir
- d Université d'Evry Val d'Essonne , Evry , France
- e CNRS-UMR 8030 , Evry , France
- f CEA, DRF, Institut de biologie François Jacob , Genoscope, Evry , France
| |
Collapse
|
14
|
Feng S, Hong X, Wang T, Huang X, Tong Y, Yang H. Reutilization of high COD leachate via recirculation strategy for methane production in anaerobic digestion of municipal solid waste: Performance and dynamic of methanogen community. BIORESOURCE TECHNOLOGY 2019; 288:121509. [PMID: 31195363 DOI: 10.1016/j.biortech.2019.121509] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2019] [Revised: 05/11/2019] [Accepted: 05/17/2019] [Indexed: 06/09/2023]
Abstract
The influences of reutilization of high COD leachate via recirculation strategy on methane production and dynamic of methanogen community in anaerobic digestion of Municipal Solid Waste (MSW) were revealed. With a COD concentration of 6000 mg·L-1 recirculation, the efficiency of hydrolytic acidification process was improved and alleviated the pH reduction during acidification, while the highest COD removal efficiency was achieved. The maximum methane production rate and accumulated CH4 production by the 6000 mg·L-1 group increased by 90.7% and 156.0%, respectively. Whereas the performance of the 9000 mg·L-1 group was actually below the control group. According to high-throughput sequencing, the superiority of acetotrophic Methanothrix was replaced by hydrogenotrophic Methanobacterium in the 3000- and 6000-mg·L-1 systems. Methanoculleus predominated in the 9000-mg·L-1 system, while Methanoregula, Methanolinea, and Methanospirillum suffered intensive inhibition effects. Canonical correspondence analysis verified a positive correlation between the dominant methanogens Methanobacterium and CH4 production, and a negative correlation with Methanoculleus.
Collapse
Affiliation(s)
- Shoushuai Feng
- School of Biotechnology, Jiangnan University, No. 1800 Lihu Road, Wuxi 214122, Jiangsu, China; The Key Laboratory of Industrial Biotechnology, Ministry of Education, No. 1800 Lihu Road, Wuxi 214122, Jiangsu, China; Key Laboratory of Carbohydrate Chemistry and Biotechnology (Jiangnan University) Ministry of Education, No. 1800 Lihu Road, Wuxi 214122, Jiangsu, China
| | - Xianjing Hong
- School of Biotechnology, Jiangnan University, No. 1800 Lihu Road, Wuxi 214122, Jiangsu, China; The Key Laboratory of Industrial Biotechnology, Ministry of Education, No. 1800 Lihu Road, Wuxi 214122, Jiangsu, China; Key Laboratory of Carbohydrate Chemistry and Biotechnology (Jiangnan University) Ministry of Education, No. 1800 Lihu Road, Wuxi 214122, Jiangsu, China
| | - Tao Wang
- School of Biotechnology, Jiangnan University, No. 1800 Lihu Road, Wuxi 214122, Jiangsu, China; The Key Laboratory of Industrial Biotechnology, Ministry of Education, No. 1800 Lihu Road, Wuxi 214122, Jiangsu, China; Key Laboratory of Carbohydrate Chemistry and Biotechnology (Jiangnan University) Ministry of Education, No. 1800 Lihu Road, Wuxi 214122, Jiangsu, China
| | - Xing Huang
- WUXI City Environmental Technology Co., Ltd, No. 3 Tangnan Road, Liangxi District, Wuxi 214026, Jiangsu, China
| | - Yanjun Tong
- National Engineering Research Center for Functional Food, School of Food Science and Technology, Jiangnan University, No. 1800 Lihu Road, Wuxi 214122, Jiangsu, China
| | - Hailin Yang
- School of Biotechnology, Jiangnan University, No. 1800 Lihu Road, Wuxi 214122, Jiangsu, China; The Key Laboratory of Industrial Biotechnology, Ministry of Education, No. 1800 Lihu Road, Wuxi 214122, Jiangsu, China; Key Laboratory of Carbohydrate Chemistry and Biotechnology (Jiangnan University) Ministry of Education, No. 1800 Lihu Road, Wuxi 214122, Jiangsu, China.
| |
Collapse
|
15
|
Zhang Q, Wang M, Ma X, Gao Q, Wang T, Shi X, Zhou J, Zuo J, Yang Y. High variations of methanogenic microorganisms drive full-scale anaerobic digestion process. ENVIRONMENT INTERNATIONAL 2019; 126:543-551. [PMID: 30852441 DOI: 10.1016/j.envint.2019.03.005] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2018] [Revised: 02/26/2019] [Accepted: 03/01/2019] [Indexed: 06/09/2023]
Abstract
Anaerobic digestion is one of the most successful waste management strategies worldwide, wherein microorganisms play an essential role in reducing organic pollutants and producing renewable energy. However, variations of microbial community in full-scale anaerobic digesters, particularly functional groups relevant to biogas production, remain elusive. Here, we examined microbial community in a year-long monthly time series of 3 full-scale anaerobic digesters. We observed substantial diversification in community composition, with only a few abundant OTUs (e.g. Clostridiales, Anaerolineaceae and Methanosaeta) persistently present across different samples. Similarly, there were high variations in relative abundance of methanogenic archaea and methanogenic genes, which were positively correlated (r2 = 0.530, P < 0.001). Variations of methanogens explained 55.7% of biogas producing rates, much higher than the explanatory percentage of environmental parameters (16.4%). Hydrogenotrophic methanogens, especially abundant Methanomicrobiales taxa, were correlated with biogas production performance (r = 0.665, P < 0.001) and nearly all methanogenic genes (0.430 < r < 0.735, P < 0.012). Given that methanogenic archaea or genes are well established for methanogenesis, we conclude that high variations in methanogenic traits (e.g. taxa or genes) are responsible for biogas production variations in full-scale anaerobic digesters.
Collapse
Affiliation(s)
- Qiuting Zhang
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 10084, China
| | - Mengmeng Wang
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 10084, China; School of Life Sciences, South China Normal University, Guangzhou, China
| | - Xingyu Ma
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 10084, China
| | - Qun Gao
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 10084, China
| | - Tengxu Wang
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 10084, China
| | - Xuchuan Shi
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 10084, China
| | - Jizhong Zhou
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 10084, China; Institute for Environmental Genomics, Department of Microbiology and Plant Biology, University of Oklahoma, Norman, OK 73019, USA; School of Civil Engineering and Environmental Sciences, University of Oklahoma, Norman, OK 73019, USA; Earth and Environmental Sciences, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Jiane Zuo
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 10084, China.
| | - Yunfeng Yang
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 10084, China.
| |
Collapse
|
16
|
Engel C, Schattenberg F, Dohnt K, Schröder U, Müller S, Krull R. Long-Term Behavior of Defined Mixed Cultures of Geobacter sulfurreducens and Shewanella oneidensis in Bioelectrochemical Systems. Front Bioeng Biotechnol 2019; 7:60. [PMID: 30972336 PMCID: PMC6445848 DOI: 10.3389/fbioe.2019.00060] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Accepted: 03/05/2019] [Indexed: 11/24/2022] Open
Abstract
This work aims to investigate the long-term behavior of interactions of electrochemically active bacteria in bioelectrochemical systems. The electrochemical performance and biofilm characteristics of pure cultures of Geobacter sulfurreducens and Shewanella oneidensis are being compared to a defined mixed culture of both organisms. While S. oneidensis pure cultures did not form cohesive and stable biofilms on graphite anodes and only yielded 0.034 ± 0.011 mA/cm2 as maximum current density by feeding of each 5 mM lactate and acetate, G. sulfurreducens pure cultures formed 69 μm thick, area-wide biofilms with 10 mM acetate as initial substrate concentration and yielded a current of 0.39 ± 0.09 mA/cm2. Compared to the latter, a defined mixed culture of both species was able to yield 38% higher maximum current densities of 0.54 ± 0.07 mA/cm2 with each 5 mM lactate and acetate. This increase in current density was associated with a likewise increased thickness of the anodic biofilm to approximately 93 μm. It was further investigated whether a sessile incorporation of S. oneidensis into the mixed culture biofilm, which has been reported previously for short-term experiments, is long-term stable. The results demonstrate that S. oneidensis was not stably incorporated into the biofilm; rather, the planktonic presence of S. oneidensis has a positive effect on the biofilm growth of G. sulfurreducens and thus on current production.
Collapse
Affiliation(s)
- Christina Engel
- Institute of Biochemical Engineering, Technische Universität Braunschweig, Braunschweig, Germany.,Braunschweig Centre of Systems Biology (BRICS), Technische Universität Braunschweig, Braunschweig, Germany
| | - Florian Schattenberg
- Working Group Flow Cytometry, Department of Environmental Microbiology, Centre for Environmental Research - UFZ, Leipzig, Germany
| | - Katrin Dohnt
- Institute of Biochemical Engineering, Technische Universität Braunschweig, Braunschweig, Germany.,Braunschweig Centre of Systems Biology (BRICS), Technische Universität Braunschweig, Braunschweig, Germany
| | - Uwe Schröder
- Braunschweig Centre of Systems Biology (BRICS), Technische Universität Braunschweig, Braunschweig, Germany.,Institute of Environmental and Sustainable Chemistry, Technische Universität Braunschweig, Braunschweig, Germany
| | - Susann Müller
- Working Group Flow Cytometry, Department of Environmental Microbiology, Centre for Environmental Research - UFZ, Leipzig, Germany
| | - Rainer Krull
- Institute of Biochemical Engineering, Technische Universität Braunschweig, Braunschweig, Germany.,Braunschweig Centre of Systems Biology (BRICS), Technische Universität Braunschweig, Braunschweig, Germany
| |
Collapse
|
17
|
Tanet L, Tamburini C, Baumas C, Garel M, Simon G, Casalot L. Bacterial Bioluminescence: Light Emission in Photobacterium phosphoreum Is Not Under Quorum-Sensing Control. Front Microbiol 2019; 10:365. [PMID: 30886606 PMCID: PMC6409340 DOI: 10.3389/fmicb.2019.00365] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2018] [Accepted: 02/12/2019] [Indexed: 01/03/2023] Open
Abstract
Bacterial-bioluminescence regulation is often associated with quorum sensing. Indeed, many studies have been made on this subject and indicate that the expression of the light-emission-involved genes is density dependent. However, most of these studies have concerned two model species, Aliivibrio fischeri and Vibrio campbellii. Very few works have been done on bioluminescence regulation for the other bacterial genera. Yet, according to the large variety of habitats of luminous marine bacteria, it would not be surprising to find different light-regulation systems. In this study, we used Photobacterium phosphoreum ANT-2200, a piezophilic bioluminescent strain isolated from Mediterranean deep-sea waters (2200-m depth). To answer the question of whether or not the bioluminescence of P. phosphoreum ANT-2200 is under quorum-sensing control, we focused on the correlation between growth and light emission through physiological, genomic and, transcriptomic approaches. Unlike A. fischeri and V. campbellii, the light of P. phosphoreum ANT-2200 immediately increases from its initial level. Interestingly, the emitted light increases at much higher rate at the low cell density than it does for higher cell-density values. The expression level of the light-emission-involved genes stays constant all along the exponential growth phase. We also showed that, even when more light is produced, when the strain is cultivated at high hydrostatic pressure, no change in the transcription level of these genes can be detected. Through different experiments and approaches, our results clearly indicate that, under the tested conditions, the genes, directly involved in the bioluminescence in P. phosphoreum ANT-2200, are not controlled at a transcriptomic level. Quite obviously, these results demonstrate that the light emission of the strain is not density dependent, which means not under quorum-sensing control. Through this study, we point out that bacterial-bioluminescence regulation should not, from now on, be always linked with the quorum-sensing control.
Collapse
Affiliation(s)
| | | | | | | | | | - Laurie Casalot
- Aix Marseille Univ., Université de Toulon, CNRS, IRD, MIO UM 110, Marseille, France
| |
Collapse
|
18
|
De Vrieze J, Ijaz UZ, Saunders AM, Theuerl S. Terminal restriction fragment length polymorphism is an "old school" reliable technique for swift microbial community screening in anaerobic digestion. Sci Rep 2018; 8:16818. [PMID: 30429514 PMCID: PMC6235954 DOI: 10.1038/s41598-018-34921-7] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Accepted: 10/04/2018] [Indexed: 11/08/2022] Open
Abstract
The microbial community in anaerobic digestion has been analysed through microbial fingerprinting techniques, such as terminal restriction fragment length polymorphism (TRFLP), for decades. In the last decade, high-throughput 16S rRNA gene amplicon sequencing has replaced these techniques, but the time-consuming and complex nature of high-throughput techniques is a potential bottleneck for full-scale anaerobic digestion application, when monitoring community dynamics. Here, the bacterial and archaeal TRFLP profiles were compared with 16S rRNA gene amplicon profiles (Illumina platform) of 25 full-scale anaerobic digestion plants. The α-diversity analysis revealed a higher richness based on Illumina data, compared with the TRFLP data. This coincided with a clear difference in community organisation, Pareto distribution, and co-occurrence network statistics, i.e., betweenness centrality and normalised degree. The β-diversity analysis showed a similar clustering profile for the Illumina, bacterial TRFLP and archaeal TRFLP data, based on different distance measures and independent of phylogenetic identification, with pH and temperature as the two key operational parameters determining microbial community composition. The combined knowledge of temporal dynamics and projected clustering in the β-diversity profile, based on the TRFLP data, distinctly showed that TRFLP is a reliable technique for swift microbial community dynamics screening in full-scale anaerobic digestion plants.
Collapse
Affiliation(s)
- Jo De Vrieze
- Center for Microbial Ecology and Technology (CMET), Ghent University, Coupure Links 653, B-9000, Gent, Belgium.
| | - Umer Z Ijaz
- Infrastructure and Environment Research Division, School of Engineering, University of Glasgow, Glasgow, UK
| | - Aaron M Saunders
- Department of Biotechnology, Chemistry and Environmental Engineering, Aalborg University, Sohngardsholmsvej 49, 9000, Aalborg, Denmark
| | - Susanne Theuerl
- Leibniz Institute for Agricultural Engineering and Bioeconomy e.V. (ATB), Department Bioengineering, Max-Eyth-Allee 100, D-14469, Potsdam, Germany
| |
Collapse
|
19
|
Zhang J, Chen X, Liu J, Huang B, Xu M. Structural characteristics of a spiral symmetry stream anaerobic bioreactor based on CFD. Biochem Eng J 2018. [DOI: 10.1016/j.bej.2018.05.016] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
|
20
|
Khan MA, Patel PG, Ganesh AG, Rais N, Faheem SM, Khan ST. Assessing Methanogenic Archaeal Community in Full Scale Anaerobic Sludge Digester Systems in Dubai, United Arab Emirates. Open Microbiol J 2018; 12:123-134. [PMID: 29785219 PMCID: PMC5960743 DOI: 10.2174/1874285801812010123] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2018] [Revised: 04/18/2018] [Accepted: 04/19/2018] [Indexed: 11/22/2022] Open
Abstract
Introduction: Anaerobic digestion for methane production comprises of an exceptionally diverse microbial consortium, a profound understanding about which is still constrained. In this study, the methanogenic archaeal communities in three full-scale anaerobic digesters of a Municipal Wastewater Treatment Plant were analyzed by Fluorescence in situ hybridization and quantitative real-time Polymerase Chain Reaction (qPCR) technique. Methods & Materials: Fluorescence in situ hybridization (FISH) was performed to detect and quantify the methanogenic Archaea in the sludge samples whereas qPCR was carried out to support the FISH analysis. Multiple probes targeting domain archaea, different orders and families of Archaea were used for the studies. Results and Discussion: In general, the aceticlastic organisms (Methanosarcinaceae & Methanosaetaceae) were more abundant than the hydrogenotrophic organisms (Methanobacteriales, Methanomicrobiales, Methanobacteriaceae & Methanococcales). Both FISH and qPCR indicated that family Methanosaetaceae was the most abundant suggesting that aceticlastic methanogenesis is probably the dominant methane production pathway in these digesters. Conclusion: Future work involving high-throughput sequencing methods and correlating archaeal communities with the main operational parameters of anaerobic digesters will help to obtain a better understanding of the dynamics of the methanogenic archaeal community in wastewater treatment plants in United Arab Emirates (UAE) which in turn would lead to improved performance of anaerobic sludge digesters.
Collapse
Affiliation(s)
- Munawwar A Khan
- Department of Life and Environmental Sciences, College of Natural and Health Sciences, Zayed University, P.O.Box: 19282, Dubai, UAE
| | - Poojabahen G Patel
- School of Life Sciences, Manipal University, Dubai International Academic City, P.O.Box 345050, Dubai, UAE
| | - Arpitha G Ganesh
- Department of Life and Environmental Sciences, College of Natural and Health Sciences, Zayed University, P.O.Box: 19282, Dubai, UAE
| | - Naushad Rais
- School of Life Sciences, Manipal University, Dubai International Academic City, P.O.Box 345050, Dubai, UAE
| | - Sultan M Faheem
- School of Life Sciences, Manipal University, Dubai International Academic City, P.O.Box 345050, Dubai, UAE
| | - Shams T Khan
- Department of Agricultural Microbiology, Aligarh Muslim University, Aligarh, 2002002, UP. India
| |
Collapse
|
21
|
Liu Y, Ma S, Huang L, Wang S, Liu G, Yang H, Zheng D, Cheng J, Xu Z, Deng L. Two-step heating mode with the same energy consumption as conventional heating for enhancing methane production during anaerobic digestion of swine wastewater. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2018; 209:301-307. [PMID: 29306839 DOI: 10.1016/j.jenvman.2017.12.061] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2017] [Revised: 10/26/2017] [Accepted: 12/22/2017] [Indexed: 06/07/2023]
Abstract
With high percentage of washing water, swine wastewater is characterized by large volume and low concentration of total solids. Thus, in treating swine wastewater, it is relatively difficult to heat digesters, resulting in low methane production at low ambient temperatures (ATs). To increase methane production from swine wastewater, this study proposed a novel "two-step heating (TSH)" mode with the same energy consumption as a one-step process for anaerobic digestion. Compared with the traditionally heated digesters (one-step heating), the digestion temperature in TSH digesters increased by 3.50-10.50 °C under the assumption of no heat dissipation and by 3.30-9.25 °C in the actual experiments. Although methane production of the TSH digesters improved by 15% in our experiments, the improvement was far less than theoretically estimated. This was mainly caused by short hydraulic retention time and sludge washout in the digesters. Moreover, the acetoclastic methanogenesis, accomplished by genus Methanosaeta, was the major methanogenesis pathway at low temperatures in both the TSH and conventional heating modes. However, the relative abundance of syntrophic bacteria and hydrogenotrophic methanogens in TSH mode were both higher than in the digesters operation in conventional heating mode when the atmospheric temperature was below 10 °C.
Collapse
Affiliation(s)
- Yi Liu
- Biogas Institute of Ministry of Agriculture, No. 13 Section 4, South Renmin Rd., Chengdu, 610041, PR China
| | - Shichun Ma
- Biogas Institute of Ministry of Agriculture, No. 13 Section 4, South Renmin Rd., Chengdu, 610041, PR China
| | - Liang Huang
- Sichuan University, No. 24 South Section 1, 1st Ring Rd., Chengdu, 610065, PR China
| | - Shiyu Wang
- Leshan Qinli Agricultural Development Co. Ltd., Maershan, Shizhong District, Leshan, 614000, PR China
| | - Gangjin Liu
- Biogas Institute of Ministry of Agriculture, No. 13 Section 4, South Renmin Rd., Chengdu, 610041, PR China
| | - Hongnan Yang
- Biogas Institute of Ministry of Agriculture, No. 13 Section 4, South Renmin Rd., Chengdu, 610041, PR China
| | - Dan Zheng
- Biogas Institute of Ministry of Agriculture, No. 13 Section 4, South Renmin Rd., Chengdu, 610041, PR China
| | - Jingsi Cheng
- Biogas Institute of Ministry of Agriculture, No. 13 Section 4, South Renmin Rd., Chengdu, 610041, PR China
| | - Ze Xu
- Biogas Institute of Ministry of Agriculture, No. 13 Section 4, South Renmin Rd., Chengdu, 610041, PR China
| | - Liangwei Deng
- Biogas Institute of Ministry of Agriculture, No. 13 Section 4, South Renmin Rd., Chengdu, 610041, PR China.
| |
Collapse
|
22
|
John M, Trzcinski AP, Zhou Y, Ng WJ. Microbial stress mediated intercellular nanotubes in an anaerobic microbial consortium digesting cellulose. Sci Rep 2017; 7:18006. [PMID: 29269771 PMCID: PMC5740137 DOI: 10.1038/s41598-017-18198-w] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2015] [Accepted: 12/05/2017] [Indexed: 01/15/2023] Open
Abstract
The anaerobic digestion process is a multi - step reaction dependent on concerted activities such as exchange of metabolites among physiologically different microbial communities. This study investigated the impact of iron oxide nanoparticles on the anaerobic sludge microbiota. It was shown there were three distinct microbial phases following addition of the nanoparticles: microbial stress and cell death of approximately one log order of magnitude, followed by microbial rewiring, and recovery. Furthermore, it was noted that cellular stress led to the establishment of intercellular nanotubes within the microbial biomass. Intercellular nanotube - mediated communication among genetically engineered microorganisms and ad hoc assembled co - cultures have been previously reported. This study presents evidence of intercellular nanotube formation within an environmental sample - i.e., anaerobic sludge microbiota subjected to stress. Our observations suggested a mode of microbial communication in the anaerobic digestion process not previously explored and which may have implications on bioreactor design and microbial functions.
Collapse
Affiliation(s)
- Martina John
- Advanced Environmental Biotechnology Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, CleanTech One, #06-08, Singapore, 637141, Singapore.
- Division of Environmental and Water Resources, School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore.
| | - Antoine Prandota Trzcinski
- Advanced Environmental Biotechnology Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, CleanTech One, #06-08, Singapore, 637141, Singapore
| | - Yan Zhou
- Advanced Environmental Biotechnology Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, CleanTech One, #06-08, Singapore, 637141, Singapore
| | - Wun Jern Ng
- Advanced Environmental Biotechnology Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, CleanTech One, #06-08, Singapore, 637141, Singapore.
- Division of Environmental and Water Resources, School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore.
| |
Collapse
|
23
|
García-Mancha N, Monsalvo VM, Puyol D, Rodriguez JJ, Mohedano AF. Enhanced anaerobic degradability of highly polluted pesticides-bearing wastewater under thermophilic conditions. JOURNAL OF HAZARDOUS MATERIALS 2017; 339:320-329. [PMID: 28658641 DOI: 10.1016/j.jhazmat.2017.06.032] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2017] [Revised: 06/14/2017] [Accepted: 06/15/2017] [Indexed: 06/07/2023]
Abstract
This work presents a sustainable and cost-competitive solution for hardly biodegradable pesticides-bearing wastewater treatment in an anaerobic expanded granular sludge bed (EGSB) reactor at mesophilic (35°C) and thermophilic (55°C). The reactor was operated in continuous mode during 160days, achieving an average COD removal of 33 and 44% under mesophilic and thermophilic conditions, respectively. The increase of temperature improved the biomass activity and the production of methane by 35%. Around 96% of pesticides identified in raw wastewater were not detected in both mesophilic and thermophilic effluents. A dramatic selection of the microbial population in anaerobic granules was caused by the presence of pesticides, which also changed significantly when the temperature was increased. Pesticides caused a significant inhibition on methanogenesis, especially over acetoclastic methanogens. Aerobic biodegradability tests of the resulting anaerobic effluents revealed that aerobic post-treatment is also a feasible and effective option, yielding more than 60% COD reduction.
Collapse
Affiliation(s)
- N García-Mancha
- Chemical Engineering Section, University Autonoma de Madrid, Francisco Tomas y Valiente 7, 28049 Madrid, Spain.
| | - V M Monsalvo
- Innovation and Technology Department, FCC Aqualia, Av. del Camino de Santiago, 40, 28050 Madrid, Spain.
| | - D Puyol
- Department of Chemical and Energy Tech., Chemical and Environmental Tech., Mechanical Tech. and Analytical Chemistry ESCET, Rey Juan Carlos University, 28933 Madrid, Spain.
| | - J J Rodriguez
- Chemical Engineering Section, University Autonoma de Madrid, Francisco Tomas y Valiente 7, 28049 Madrid, Spain.
| | - A F Mohedano
- Chemical Engineering Section, University Autonoma de Madrid, Francisco Tomas y Valiente 7, 28049 Madrid, Spain.
| |
Collapse
|
24
|
Antwi P, Li J, Opoku Boadi P, Meng J, Shi E, Xue C, Zhang Y, Ayivi F. Functional bacterial and archaeal diversity revealed by 16S rRNA gene pyrosequencing during potato starch processing wastewater treatment in an UASB. BIORESOURCE TECHNOLOGY 2017; 235:348-357. [PMID: 28384587 DOI: 10.1016/j.biortech.2017.03.141] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2017] [Revised: 03/17/2017] [Accepted: 03/22/2017] [Indexed: 06/07/2023]
Abstract
Microbial community structure of sludge sampled from an UASB treating potato starch processing wastewater (PSPW) was investigated. Operational taxonomic units revealed at 97% sequence identity tolerance was 2922, 2869 and 3919 for bottom, middle and top sections of the reactor, respectively. Overall abundant phylum observed within the UASB was low-G+C-Gram-positive bacteria affiliated to Firmicutes (26.01%) followed by Chloroflexi (16.70%), Proteobacteria (12.71%), Cloacimonetes (10.72%), Bacteroidetes (7.87%), Synergistetes (9.02%) and Euryarchaeota (8.82%). Whiles Firmicutes had dominated the bottom and top section by 34.01% and 28.64%, respectively, middle section was predominantly Euryarchaeota (24.32%) with major dominance in methanogens affiliated to genus Methanosaeta. The results demonstrated substantial stratification of the microbial community structure along the reactor height with various functional bacterial groups which subsequently allowed degradation of organics in PSPW in sequential mode. The findings herein would provide guidance for optimizing the anaerobic process and operation of the UASB.
Collapse
Affiliation(s)
- Philip Antwi
- State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China
| | - Jianzheng Li
- State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China.
| | - Portia Opoku Boadi
- School of Management, Harbin Institute of Technology, 92 West Dazhi Street, Nan Gang District, Harbin 150001, PR China
| | - Jia Meng
- State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China
| | - En Shi
- State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China
| | - Chi Xue
- State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China
| | - Yupeng Zhang
- State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China
| | - Frederick Ayivi
- Department of Geography, University of North Carolina, 237 Graham Building, 1009 Spring Garden St, Greensboro, NC 27412, USA
| |
Collapse
|
25
|
Chen Y, Lan S, Wang L, Dong S, Zhou H, Tan Z, Li X. A review: Driving factors and regulation strategies of microbial community structure and dynamics in wastewater treatment systems. CHEMOSPHERE 2017; 174:173-182. [PMID: 28161518 DOI: 10.1016/j.chemosphere.2017.01.129] [Citation(s) in RCA: 74] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2016] [Revised: 01/24/2017] [Accepted: 01/25/2017] [Indexed: 06/06/2023]
Abstract
The performance and stabilization of biological wastewater treatment systems 1are closely related to the microbial community structure and dynamics. In this paper, the effects and mechanisms of influent composition, process configuration, operating parameters (dissolved oxygen [DO], pH, hydraulic retention time [HRT] and sludge retention time [SRT]) and environmental condition (temperature) to the change of microbial community structure and process performance (nitrification, denitrification, biological phosphorus removal, organics mineralization and utilization, etc.) are critically reviewed. Furthermore, some strategies for microbial community structure regulation, mainly bioaugmentation, process adjustment and operating parameters optimization, applied in the current wastewater treatment systems are also discussed. Although the recent studies have strengthened our understanding on the relationship between microbial community structure and wastewater treatment process performance, how to fully tap the microbial information, optimize the microbial community structure and maintain the process performance in wastewater treatment systems are still full of challenges.
Collapse
Affiliation(s)
- Yangwu Chen
- Key Laboratory of Environmental and Applied Microbiology, Chengdu Institute of Biology, Chinese Academy of Sciences, 610041, Chengdu, PR China; Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, 610041, Chengdu, PR China; University of Chinese Academy of Sciences, 100049, Beijing, PR China
| | - Shuhuan Lan
- Key Laboratory of Environmental and Applied Microbiology, Chengdu Institute of Biology, Chinese Academy of Sciences, 610041, Chengdu, PR China; Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, 610041, Chengdu, PR China
| | - Longhui Wang
- Key Laboratory of Environmental and Applied Microbiology, Chengdu Institute of Biology, Chinese Academy of Sciences, 610041, Chengdu, PR China; Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, 610041, Chengdu, PR China
| | - Shiyang Dong
- Key Laboratory of Environmental and Applied Microbiology, Chengdu Institute of Biology, Chinese Academy of Sciences, 610041, Chengdu, PR China; Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, 610041, Chengdu, PR China; University of Chinese Academy of Sciences, 100049, Beijing, PR China
| | - Houzhen Zhou
- Key Laboratory of Environmental and Applied Microbiology, Chengdu Institute of Biology, Chinese Academy of Sciences, 610041, Chengdu, PR China; Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, 610041, Chengdu, PR China
| | - Zhouliang Tan
- Key Laboratory of Environmental and Applied Microbiology, Chengdu Institute of Biology, Chinese Academy of Sciences, 610041, Chengdu, PR China; Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, 610041, Chengdu, PR China.
| | - Xudong Li
- Key Laboratory of Environmental and Applied Microbiology, Chengdu Institute of Biology, Chinese Academy of Sciences, 610041, Chengdu, PR China; Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, 610041, Chengdu, PR China
| |
Collapse
|
26
|
Petropoulos E, Dolfing J, Davenport RJ, Bowen EJ, Curtis TP. Developing cold-adapted biomass for the anaerobic treatment of domestic wastewater at low temperatures (4, 8 and 15 °C) with inocula from cold environments. WATER RESEARCH 2017; 112:100-109. [PMID: 28142091 DOI: 10.1016/j.watres.2016.12.009] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2016] [Revised: 12/02/2016] [Accepted: 12/09/2016] [Indexed: 06/06/2023]
Abstract
Temperature is the bottleneck for the anaerobic treatment of domestic wastewater in temperate climates. Most previous attempts to achieve anaerobic treatment at low temperatures have attempted to acclimatize mesophilic sludge and have failed at temperatures below 10-13 °C. We describe an alternative approach using communities from environments that have been exposed to low temperatures over evolutionary time-scales as seed for such reactors. Batch reactors were inoculated with a mixture of soils and sediments from the high Arctic and an Alpine lake to treat UV-sterilized raw domestic wastewater at 4, 8 and 15 °C. To evaluate the intrinsic treatment capacity of the bacteria the specific rates of methanogenesis and hydrolysis were evaluated. Specific methanogenic activity at 4, 8 and 15 °C was 6.3, 7.6 and 10.3 fmol CH4 cell-1day-1 respectively. Specific putative hydrolysis rates were 76.2, 186.6 and 251.9 fgrams COD cell-1day-1. Hydrolysis was twice as temperature sensitive as methanogenesis (Q10: 4.62 and 1.57 respectively). The specific rates are over ten times higher than we have previously observed in microcosms fed with settled wastewater at the same temperatures. The results imply that inoculating reactors with cold-adapted communities is a promising way to develop biomass capable of treating anaerobic wastewater treatment at low temperatures whilst achieving an effluent that conforms to the EC Directive COD standards. Large-scale reactors are feasible if satisfactory cell concentrations can be achieved.
Collapse
Affiliation(s)
- Evangelos Petropoulos
- School of Civil Engineering and Geosciences, Newcastle University, Newcastle NE17RU, England, UK
| | - Jan Dolfing
- School of Civil Engineering and Geosciences, Newcastle University, Newcastle NE17RU, England, UK
| | - Russell J Davenport
- School of Civil Engineering and Geosciences, Newcastle University, Newcastle NE17RU, England, UK
| | - Emma J Bowen
- School of Civil Engineering and Geosciences, Newcastle University, Newcastle NE17RU, England, UK
| | - Thomas P Curtis
- School of Civil Engineering and Geosciences, Newcastle University, Newcastle NE17RU, England, UK.
| |
Collapse
|
27
|
Gokal J, Awolusi OO, Enitan AM, Kumari S, Bux F. Chapter 4 Molecular Characterization and Quantification of Microbial Communities in Wastewater Treatment Systems. Microb Biotechnol 2016. [DOI: 10.1201/9781315367880-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
|
28
|
Seib MD, Berg KJ, Zitomer DH. Influent wastewater microbiota and temperature influence anaerobic membrane bioreactor microbial community. BIORESOURCE TECHNOLOGY 2016; 216:446-452. [PMID: 27262719 DOI: 10.1016/j.biortech.2016.05.098] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2016] [Revised: 05/20/2016] [Accepted: 05/24/2016] [Indexed: 06/05/2023]
Abstract
Sustainable municipal wastewater recovery scenarios highlight benefits of anaerobic membrane bioreactors (AnMBRs). However, influences of continuous seeding by influent wastewater and temperature on attached-growth AnMBRs are not well understood. In this study, four bench-scale AnMBR operated at 10 and 25°C were fed synthetic (SPE) and then real (PE) primary effluent municipal wastewater. Illumina sequencing revealed different bacterial communities in each AnMBR in response to temperature and bioreactor configuration, whereas differences were not observed in archaeal communities. Activity assays revealed hydrogenotrophic methanogenesis was the dominant methanogenic pathway at 10°C. The significant relative abundance of Methanosaeta at 10°C concomitant with low acetoclastic methanogenic activity may indicate possible Methanosaeta-Geobacter direct interspecies electron transfer. When AnMBR feed was changed to PE, continual seeding with wastewater microbiota caused AnMBR microbial communities to shift, becoming more similar to PE microbiota. Therefore, influent wastewater microbiota, temperature and reactor configuration influenced the AnMBR microbial community.
Collapse
Affiliation(s)
- M D Seib
- Department of Civil, Construction and Environmental Engineering, Marquette University, P.O. Box 1881, Milwaukee, WI 53233, USA.
| | - K J Berg
- Department of Civil, Construction and Environmental Engineering, Marquette University, P.O. Box 1881, Milwaukee, WI 53233, USA
| | - D H Zitomer
- Department of Civil, Construction and Environmental Engineering, Marquette University, P.O. Box 1881, Milwaukee, WI 53233, USA
| |
Collapse
|
29
|
De Vrieze J, Coma M, Debeuckelaere M, Van der Meeren P, Rabaey K. High salinity in molasses wastewaters shifts anaerobic digestion to carboxylate production. WATER RESEARCH 2016; 98:293-301. [PMID: 27110885 DOI: 10.1016/j.watres.2016.04.035] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2016] [Revised: 04/13/2016] [Accepted: 04/15/2016] [Indexed: 05/16/2023]
Abstract
Biorefinery wastewaters are often treated by means of anaerobic digestion to produce biogas. Alternatively, these wastewaters can be fermented, leading to the formation of carboxylates. Here, we investigated how lab-scale upflow anaerobic sludge blanket reactors could be shifted to fermentation by changing organic loading rate, hydraulic retention time, pH, and salinity. A strong increase in volatile fatty acid concentration up to 40 g COD L(-1) was achieved through increasing salinity above 30 mS cm(-1), as well as a decrease in methane production by more than 90%, which could not be obtained by adjusting the other parameters, thus, indicating a clear shift from methane to carboxylate production. Microbial community analysis revealed a shift in bacterial community to lower evenness and richness values, following the increased salinity and VFA concentration during the fermentation process. A selective enrichment of the hydrogenotrophic Methanomicrobiales took place upon the shift to fermentation, despite a severe decrease in methane production. Particle size distribution revealed a strong degranulation of the sludge in the reactor, related to the high salinity, which resulted in a wash-out of the biomass. This research shows that salinity is a key parameter enabling a shift from methane to carboxylate production in a stable fermentation process.
Collapse
Affiliation(s)
- Jo De Vrieze
- Center for Microbial Ecology and Technology (CMET), Ghent University, Coupure Links 653, B-9000 Gent, Belgium
| | - Marta Coma
- Center for Microbial Ecology and Technology (CMET), Ghent University, Coupure Links 653, B-9000 Gent, Belgium
| | - Matthias Debeuckelaere
- Center for Microbial Ecology and Technology (CMET), Ghent University, Coupure Links 653, B-9000 Gent, Belgium
| | - Paul Van der Meeren
- Department of Applied Analytical and Physical Chemistry, Coupure Links 653, B-9000 Gent, Belgium
| | - Korneel Rabaey
- Center for Microbial Ecology and Technology (CMET), Ghent University, Coupure Links 653, B-9000 Gent, Belgium; Advanced Water Management Centre, The University of Queensland, Brisbane, Queensland 4072, Australia.
| |
Collapse
|
30
|
|
31
|
Theiss J, Rother M, Röske K. Influence of DNA isolation method on the investigation of archaeal diversity and abundance in biogas plants. Arch Microbiol 2016; 198:619-28. [PMID: 27089887 DOI: 10.1007/s00203-016-1221-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2015] [Revised: 03/29/2016] [Accepted: 04/06/2016] [Indexed: 11/26/2022]
Abstract
Various methods are available for DNA isolation from environmental samples. Because the chemical and biological composition of samples such as soil, sludge, or plant material is different, the effectiveness of DNA isolation can vary depending on the method applied and thus, have a substantial effect on the results of downstream analysis of the microbial community. Although the process of biogas formation is being intensely investigated, a systematic evaluation of kits for DNA isolation from material of biogas plants is still lacking. Since no DNA isolation kit specifically tailored for DNA isolation from sludge of biogas plants is available, this study compares five commercially available kits regarding their influence on downstream analyses such denaturing gradient gel electrophoresis (DGGE) and quantitative real-time PCR (qPCR). The results show that not all kits are equally suited for the DNA isolation from samples of different biogas plants, but highly reproducible DGGE fingerprints as well as qPCR results across the tested samples from biogas reactors using different substrate compositions could be produced using selected kits.
Collapse
Affiliation(s)
- Juliane Theiss
- Sächsische Akademie der Wissenschaften zu Leipzig, Karl-Tauchnitz-Straße 1, 04107, Leipzig, Germany
| | - Michael Rother
- Technische Universität Dresden, Professur für Mikrobielle Diversität, Zellescher Weg 20b, 01217, Dresden, Germany
| | - Kerstin Röske
- Sächsische Akademie der Wissenschaften zu Leipzig, Karl-Tauchnitz-Straße 1, 04107, Leipzig, Germany.
| |
Collapse
|
32
|
Enrichment of Methanosaetaceae on carbon felt and biochar during anaerobic digestion of a potassium-rich molasses stream. Appl Microbiol Biotechnol 2016; 100:5177-87. [DOI: 10.1007/s00253-016-7503-y] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Revised: 03/22/2016] [Accepted: 03/24/2016] [Indexed: 01/30/2023]
|
33
|
Kim J, Lee C. Response of a continuous anaerobic digester to temperature transitions: A critical range for restructuring the microbial community structure and function. WATER RESEARCH 2016; 89:241-51. [PMID: 26689661 DOI: 10.1016/j.watres.2015.11.060] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2015] [Revised: 11/24/2015] [Accepted: 11/26/2015] [Indexed: 05/03/2023]
Abstract
Temperature is a crucial factor that significantly influences the microbial activity and so the methanation performance of an anaerobic digestion (AD) process. Therefore, how to control the operating temperature for optimal activity of the microbes involved is a key to stable AD. This study examined the response of a continuous anaerobic reactor to a series of temperature shifts over a wide range of 35-65 °C using a dairy-processing byproduct as model wastewater. During the long-term experiment for approximately 16 months, the reactor was subjected to stepwise temperature increases by 5 °C at a fixed HRT of 15 days. The reactor showed stable performance within the temperature range of 35-45 °C, with the methane production rate and yield being maximum at 45 °C (18% and 26% greater, respectively, than at 35 °C). However, the subsequent increase to 50 °C induced a sudden performance deterioration with a complete cessation of methane recovery, indicating that the temperature range between 45 °C and 50 °C had a critical impact on the transition of the reactor's methanogenic activity from mesophilic to thermophilic. This serious process perturbation was associated with a severe restructuring of the reactor microbial community structure, particularly of methanogens, quantitatively as well as qualitatively. Once restored by interrupted feeding for about two months, the reactor maintained fairly stable performance under thermophilic conditions until it was upset again at 65 °C. Interestingly, in contrast to most previous reports, hydrogenotrophs largely dominated the methanogen community at mesophilic temperatures while acetotrophs emerged as a major group at thermophilic temperature. This implies that the primary methanogenesis route of the reactor shifted from hydrogen- to acetate-utilizing pathways with the temperature shifts from mesophilic to thermophilic temperatures. Our observations suggest that a mesophilic digester may not need to be cooled at up to 45 °C in case of undesired temperature rise, for example, by excessive self-heating, which offers a possibility to reduce operating costs.
Collapse
Affiliation(s)
- Jaai Kim
- School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Eonyang-eup, Ulju-gun, Ulsan 689-798, Republic of Korea
| | - Changsoo Lee
- School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Eonyang-eup, Ulju-gun, Ulsan 689-798, Republic of Korea.
| |
Collapse
|
34
|
Huang W, Wang Z, Guo Q, Wang H, Zhou Y, Ng WJ. Pilot-scale landfill with leachate recirculation for enhanced stabilization. Biochem Eng J 2016. [DOI: 10.1016/j.bej.2015.10.013] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
35
|
Huang W, Wang Z, Zhou Y, Ng WJ. The role of hydrogenotrophic methanogens in an acidogenic reactor. CHEMOSPHERE 2015; 140:40-46. [PMID: 25466820 DOI: 10.1016/j.chemosphere.2014.10.047] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2014] [Revised: 10/12/2014] [Accepted: 10/13/2014] [Indexed: 06/04/2023]
Abstract
A laboratory-scale acidogenic anaerobic sequencing batch reactor was set up to test the effect of pH change on microbial community structure of the reactor biomass and process performance. No immediate performance change on acidogenesis was observed after the pH change. However, as the hydrogenotrophic methanogen population decreased, hydrogen content in biogas increased followed by a sharp decrease in volatile fatty acids (VFAs) with acetic acid (HAc) in particular. Recovery of reactor performance following pH correction was only apparent after recovery of hydrogenotrophic methanogen population. These suggested hydrogenotrophic methanogens played a very important role in performance of the acidogenic process.
Collapse
Affiliation(s)
- Wenhai Huang
- School of Civil & Environmental Engineering, Nanyang Technological University, Singapore
| | - Zhenyu Wang
- School of Civil & Environmental Engineering, Nanyang Technological University, Singapore
| | - Yan Zhou
- School of Civil & Environmental Engineering, Nanyang Technological University, Singapore; Advanced Environmental Biotechnology Center, Nanyang Environment & Water Research Institute, Nanyang Technological University, Singapore.
| | - Wun Jern Ng
- School of Civil & Environmental Engineering, Nanyang Technological University, Singapore; Advanced Environmental Biotechnology Center, Nanyang Environment & Water Research Institute, Nanyang Technological University, Singapore.
| |
Collapse
|
36
|
De Vrieze J, Saunders AM, He Y, Fang J, Nielsen PH, Verstraete W, Boon N. Ammonia and temperature determine potential clustering in the anaerobic digestion microbiome. WATER RESEARCH 2015; 75:312-23. [PMID: 25819618 DOI: 10.1016/j.watres.2015.02.025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2014] [Revised: 02/13/2015] [Accepted: 02/15/2015] [Indexed: 05/07/2023]
Abstract
Anaerobic digestion is regarded as a key environmental technology in the present and future bio-based economy. The microbial community completing the anaerobic digestion process is considered complex, and several attempts already have been carried out to determine the key microbial populations. However, the key differences in the anaerobic digestion microbiomes, and the environmental/process parameters that drive these differences, remain poorly understood. In this research, we hypothesized that differences in operational parameters lead to a particular composition and organization of microbial communities in full-scale installations. A total of 38 samples were collected from 29 different full-scale anaerobic digestion installations, showing constant biogas production in function of time. Microbial community analysis was carried out by means of amplicon sequencing and real-time PCR. The bacterial community in all samples was dominated by representatives of the Firmicutes, Bacteroidetes and Proteobacteria, covering 86.1 ± 10.7% of the total bacterial community. Acetoclastic methanogenesis was dominated by Methanosaetaceae, yet, only the hydrogenotrophic Methanobacteriales correlated with biogas production, confirming their importance in high-rate anaerobic digestion systems. In-depth analysis of operational and environmental parameters and bacterial community structure indicated the presence of three potential clusters in anaerobic digestion. These clusters were determined by total ammonia concentration, free ammonia concentration and temperature, and characterized by an increased relative abundance of Bacteroidales, Clostridiales and Lactobacillales, respectively. None of the methanogenic populations, however, could be significantly attributed to any of the three clusters. Nonetheless, further experimental research will be required to validate the existence of these different clusters, and to which extent the presence of these clusters relates to stable or sub-optimal anaerobic digestion.
Collapse
Affiliation(s)
- Jo De Vrieze
- Laboratory of Microbial Ecology and Technology (LabMET), Ghent University, Coupure Links 653, B-9000 Ghent, Belgium
| | - Aaron Marc Saunders
- Department of Biotechnology, Chemistry and Environmental Engineering, Aalborg University, Sohngårdsholmsvej 49, 9000 Aalborg, Denmark
| | - Ying He
- State Key Laboratory of Microbial Metabolism, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Jing Fang
- State Key Laboratory of Microbial Metabolism, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Per Halkjaer Nielsen
- Department of Biotechnology, Chemistry and Environmental Engineering, Aalborg University, Sohngårdsholmsvej 49, 9000 Aalborg, Denmark
| | - Willy Verstraete
- Laboratory of Microbial Ecology and Technology (LabMET), Ghent University, Coupure Links 653, B-9000 Ghent, Belgium
| | - Nico Boon
- Laboratory of Microbial Ecology and Technology (LabMET), Ghent University, Coupure Links 653, B-9000 Ghent, Belgium.
| |
Collapse
|
37
|
Lee S, Lee B, Han G, Yoon H, Kim W. Performance of and methanogenic communities involved in an innovative anaerobic process for the treatment of food wastewater in a pilot plant. Biosci Biotechnol Biochem 2015; 79:1378-83. [PMID: 25744534 DOI: 10.1080/09168451.2015.1018122] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
In this study, dual-cylindrical anaerobic digesters were designed and built on the pilot plant scale for the improvement of anaerobic digestion efficiency. The removal efficiency of organics, biogas productivity, yield, and microbial communities was evaluated as performance parameters of the digester. During the stable operational period in the continuous mode, the removal efficiencies of chemical oxygen demand and total solids were 74.1 and 65.1%, respectively. Biogas productivities of 63.9 m(3)/m(3)-FWW and 1.3 m(3)/kg-VSremoved were measured. The hydrogenotrophic methanogen orders, Methanomicrobiales and Methanobacteriales, were predominant over the aceticlastic methanogen order, Methanosarcinaceae, probably due to the tolerance of the hydrogenotrophs to environmental perturbation in the field and their faster growth rate compared with that of the aceticlastics.
Collapse
Affiliation(s)
- Seungyong Lee
- a R&D Center, POSCO Engineering & Construction Co., Ltd. , Incheon , Republic of Korea
| | | | | | | | | |
Collapse
|
38
|
Karadag D, Köroğlu OE, Ozkaya B, Cakmakci M. A review on anaerobic biofilm reactors for the treatment of dairy industry wastewater. Process Biochem 2015. [DOI: 10.1016/j.procbio.2014.11.005] [Citation(s) in RCA: 157] [Impact Index Per Article: 17.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
39
|
Pussayanavin T, Koottatep T, Eamrat R, Polprasert C. Enhanced sludge reduction in septic tanks by increasing temperature. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART A, TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING 2015; 50:81-89. [PMID: 25438134 DOI: 10.1080/10934529.2015.964633] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Septic tanks in most developing countries are constructed without drainage trenches or leaching fields to treat toilet wastewater and /or grey water. Due to the short hydraulic retention time, effluents of these septic tanks are still highly polluted, and there is usually high accumulation of septic tank sludge or septage containing high levels of organics and pathogens that requires frequent desludging and subsequent treatment. This study aimed to reduce sludge accumulation in septic tanks by increasing temperatures of the septic tank content. An experimental study employing two laboratory-scale septic tanks fed with diluted septage and operating at temperatures of 40 and 30°C was conducted. At steady-state conditions, there were more methanogenic activities occurring in the sludge layer of the septic tank operating at the temperature of 40°C, resulting in less total volatile solids (TVS) or sludge accumulation and more methane (CH4) production than in the unit operating at 30°C. Molecular analysis found more abundance and diversity of methanogenic microorganisms in the septic tank sludge operating at 40°C than at 30°C. The reduced TVS accumulation in the 40°C septic tank would lengthen the period of septage removal, resulting in a cost-saving in desluging and septage treatment. Cost-benefit analysis of increasing temperatures in septic tanks was discussed.
Collapse
Affiliation(s)
- Tatchai Pussayanavin
- a Environmental Engineering and Management , School of Environment Resources and Development, Asian Institute of Technology , Pathumthani , Thailand
| | | | | | | |
Collapse
|
40
|
Primers: Functional Genes and 16S rRNA Genes for Methanogens. SPRINGER PROTOCOLS HANDBOOKS 2015. [DOI: 10.1007/8623_2015_138] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
|
41
|
Chen Z, Wang Y, Li K, Zhou H. Effects of increasing organic loading rate on performance and microbial community shift of an up-flow anaerobic sludge blanket reactor treating diluted pharmaceutical wastewater. J Biosci Bioeng 2014; 118:284-8. [DOI: 10.1016/j.jbiosc.2014.02.027] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2013] [Revised: 02/15/2014] [Accepted: 02/27/2014] [Indexed: 10/25/2022]
|
42
|
Jáuregui-Jáuregui JA, Méndez-Acosta HO, González-Álvarez V, Snell-Castro R, Alcaraz-González V, Godon JJ. Anaerobic treatment of tequila vinasses under seasonal operating conditions: start-up, normal operation and restart-up after a long stop and starvation period. BIORESOURCE TECHNOLOGY 2014; 168:33-40. [PMID: 24785790 DOI: 10.1016/j.biortech.2014.04.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2014] [Revised: 04/03/2014] [Accepted: 04/04/2014] [Indexed: 06/03/2023]
Abstract
This study examines the performance of an anaerobic fixed-film bioreactor under seasonal operating conditions prevailing in medium and small size Tequila factories: start-up, normal operation and particularly, during the restart-up after a long stop and starvation period. The proposed start-up procedure attained a stable biofilm in a rather short period (28 days) despite unbalanced COD/N/P ratio and the use of non-acclimated inoculum. The bioreactor was restarted-up after being shut down for 6 months during which the inoculum starved. Even when biofilm detachment and bioreactor clogging were detected at the very beginning of restart-up, results show that the bioreactor performed better as higher COD removal and methane yield were attained. CE-SSCP and Q-PCR analyses, conducted on the biofilm prokaryotic communities for each operating condition, confirmed that the high COD removal results after the bioreactor clogging and the severe starvation period were mainly due to the stable archaeal and resilient bacterial populations.
Collapse
Affiliation(s)
- J A Jáuregui-Jáuregui
- Departamento de Ingeniería Química, CUCEI-Universidad de Guadalajara, Blvd. M. García Barragán 1451, C.P. 44430 Guadalajara, Jal., Mexico; División de Biotecnología y Salud, Tecnológico de Monterrey Campus Guadalajara, Av. General Ramón Corona 2514, C.P. 45201 Zapopan, Jal., Mexico
| | - H O Méndez-Acosta
- Departamento de Ingeniería Química, CUCEI-Universidad de Guadalajara, Blvd. M. García Barragán 1451, C.P. 44430 Guadalajara, Jal., Mexico.
| | - V González-Álvarez
- Departamento de Ingeniería Química, CUCEI-Universidad de Guadalajara, Blvd. M. García Barragán 1451, C.P. 44430 Guadalajara, Jal., Mexico
| | - R Snell-Castro
- Departamento de Ingeniería Química, CUCEI-Universidad de Guadalajara, Blvd. M. García Barragán 1451, C.P. 44430 Guadalajara, Jal., Mexico
| | - V Alcaraz-González
- Departamento de Ingeniería Química, CUCEI-Universidad de Guadalajara, Blvd. M. García Barragán 1451, C.P. 44430 Guadalajara, Jal., Mexico
| | - J J Godon
- INRA, UR0050, Laboratoire de Biotechnologie de l'Environnement, Avenue des Etangs, F-11100 Narbonne, France
| |
Collapse
|
43
|
Bialek K, Cysneiros D, O’Flaherty V. Hydrolysis, acidification and methanogenesis during low-temperature anaerobic digestion of dilute dairy wastewater in an inverted fluidised bioreactor. Appl Microbiol Biotechnol 2014; 98:8737-50. [DOI: 10.1007/s00253-014-5864-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2014] [Revised: 05/23/2014] [Accepted: 05/23/2014] [Indexed: 11/28/2022]
|
44
|
Yilmaz V, Ince-Yilmaz E, Yilmazel YD, Duran M. Is aceticlastic methanogen composition in full-scale anaerobic processes related to acetate utilization capacity? Appl Microbiol Biotechnol 2014; 98:5217-26. [DOI: 10.1007/s00253-014-5597-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2013] [Revised: 01/24/2014] [Accepted: 02/04/2014] [Indexed: 11/24/2022]
|
45
|
Performance of an Anaerobic Baffled Filter Reactor in the Treatment of Algae-Laden Water and the Contribution of Granular Sludge. WATER 2014. [DOI: 10.3390/w6010122] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
46
|
Zhao Z, Feng Y, Feng H, Ghulam A, Su Y, Shen D. Anaerobic biotransformation of fluoronitrobenzenes and microbial communities in methanogenic systems. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART A, TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING 2014; 49:1187-1197. [PMID: 24844900 DOI: 10.1080/10934529.2014.897537] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The fluorinated compounds are becoming a ubiquitous class of environmental contaminants because of their widespread applications, and their fate is a matter of great concern under anaerobic environment. In this work, the biotransformation of five fluoronitrobenzenes (FNBs), i.e., 2-fluoronitrobenzene (2-FNB), 3-fluoronitrobenzene (3-FNB), 4-fluoronitrobenzene (4-FNB), 2,4-difluoronitrobenzene (2,4-DFNB), and 2,3,4-trifluoronitrobenzene (2,3,4-TFNB), under methanogenic conditions had been studied by semicontinuous and batch tests for the first time. In 245 days, the five FNBs except 3-FNB were transformed mainly via nitro-reduction, and the reductive defluorination was not observed. During the biotransformation of 3-FNB, the reductive defluorination occurred after 98 days; however, its product was not aniline. The maximum transformation rates of 2-FNB, 3-FNB, 4-FNB, 2,4-DFNB, and 2,3,4-TFNB were 21.21 ± 1.73, 32.14 ± 2.33, 21.33 ± 2.48, 33.89 ± 6.87, and 10.87 ± 0.84 mg FNB (g VSS h)(-1), respectively. With the increase in the number of the fluorous groups, the transformation rates did not increase. Besides, the microbial communities were characterized by means of denaturing gradient gel electrophoresis (DGGE). Results showed that the predominant archaea were Methanobacterium, Methanosphaerula, Methanofollis, Methanospirillum, Methanolinea, and Methanosaeta; the predominant bacteria were Sphingbacteriales, Flavobacteriales, bacteroidales, Deltaproteobacteria, Desulfovibrionales, Clostridates, and Pseudomonadates. Few bacteria found were with high similarity to dechlorinating microorganisms reported. The results demonstrated that the pathways of FNBs biotransformation were different from those of the chloronitrobenzenes under methanogenic conditions.
Collapse
Affiliation(s)
- Zhiqing Zhao
- a College of Environment & Resource Sciences , Zhejiang University , Hangzhou , P. R. China
| | | | | | | | | | | |
Collapse
|
47
|
Kim J, Kim W, Lee C. Absolute dominance of hydrogenotrophic methanogens in full-scale anaerobic sewage sludge digesters. J Environ Sci (China) 2013; 25:2272-80. [PMID: 24552056 DOI: 10.1016/s1001-0742(12)60299-x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Anaerobic digestion (AD) is gaining increasing attention due to the ability to covert organic pollutants into energy-rich biogas and, accordingly, growing interest is paid to the microbial ecology of AD systems. Despite extensive efforts, AD microbial ecology is still limitedly understood, especially due to the lack of quantitative information on the structures and dynamics of AD microbial communities. Such knowledge gap is particularly pronounced in sewage sludge AD processes although treating sewage sludge is among the major practical applications of AD. Therefore, we examined the microbial communities in three full-scale sewage sludge digesters using qualitative and quantitative molecular techniques in combination: denaturing gradient gel electrophoresis (DGGE) and real-time polymerase chain reaction (PCR). Eight out of eleven bacterial sequences retrieved from the DGGE analysis were not affiliated to any known species while all eleven archaeal sequences were assigned to known methanogen species. Quantitative real-time PCR analysis revealed that, based on the 16S rRNA gene abundance, the hydrogenotrophic order Methanomicrobiales is the most dominant methanogen group (> 94% of the total methanogen population) in all digesters. This corresponds well to the prevailing occurrence of the DGGE bands related to Methanolinea and Methanospirillum, both belonging to the order Methanomicrobiales, in all sludge samples. It is therefore suggested that hydrogenotrophic methanogens, especially Methanomicrobiales strains, are likely the major players responsible for biogas production in the digesters studied. Our observation is contrary to the conventional understanding that aceticlastic methanogens generally dominate methanogen communities in stable AD environments, suggesting the need for further studies on the dominance relationship in various AD systems.
Collapse
Affiliation(s)
- Jaai Kim
- School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology, Ulsan 689-798, Korea.
| | - Woong Kim
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejon 305-701, Korea
| | - Changsoo Lee
- School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology, Ulsan 689-798, Korea
| |
Collapse
|
48
|
Population dynamics of methanogens and methane formation associated with different loading rates of organic acids along with ammonia: redundancy analysis. Bioprocess Biosyst Eng 2013; 37:977-81. [DOI: 10.1007/s00449-013-1061-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2013] [Accepted: 09/09/2013] [Indexed: 11/25/2022]
|
49
|
Low-temperature (10°C) anaerobic digestion of dilute dairy wastewater in an EGSB bioreactor: microbial community structure, population dynamics, and kinetics of methanogenic populations. ARCHAEA-AN INTERNATIONAL MICROBIOLOGICAL JOURNAL 2013; 2013:346171. [PMID: 24089597 PMCID: PMC3780618 DOI: 10.1155/2013/346171] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/24/2013] [Accepted: 07/25/2013] [Indexed: 11/17/2022]
Abstract
The feasibility of anaerobic digestion of dairy wastewater at 10°C was investigated in a high height : diameter ratio EGSB reactor. Stable performance was observed at an applied organic loading rate (OLR) of 0.5–2 kg COD m−3 d−1 with chemical oxygen demand (COD) removal efficiencies above 85%. When applied OLR increased to values above 2 kg COD m−3 d−1, biotreatment efficiency deteriorated, with methanogenesis being the rate-limiting step. The bioreactor recovered quickly (3 days) after reduction of the OLR. qPCR results showed a reduction in the abundance of hydrogenotrophic methanogenic Methanomicrobiales and Methanobacteriales throughout the steady state period followed by a sharp increase in their numbers (111-fold) after the load shock. Specific methanogenic activity and maximum substrate utilising rate (Amax) of the biomass at the end of trial indicated increased activity and preference towards hydrogenotrophic methanogenesis, which correlated well with the increased abundance of hydrogenotrophic methanogens. Acetoclastic Methanosaeta spp. remained at stable levels throughout the trial. However, increased apparent half-saturation constant (Km) at the end of the trial indicated a decrease in the specific substrate affinity for acetate of the sludge, suggesting that Methanosaeta spp., which have high substrate affinity, started to be outcompeted in the reactor.
Collapse
|
50
|
Williams J, Williams H, Dinsdale R, Guwy A, Esteves S. Monitoring methanogenic population dynamics in a full-scale anaerobic digester to facilitate operational management. BIORESOURCE TECHNOLOGY 2013; 140:234-242. [PMID: 23707910 DOI: 10.1016/j.biortech.2013.04.089] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2013] [Revised: 04/22/2013] [Accepted: 04/23/2013] [Indexed: 06/02/2023]
Abstract
Microbial populations in a full-scale anaerobic digester fed on food waste were monitored over an 18-month period using qPCR. The digester exhibited a highly dynamic environment in which methanogenic populations changed constantly in response to availability of substrates and inhibitors. The methanogenic population in the digester was dominated by Methanosaetaceae, suggesting that aceticlastic methanogenesis was the main route for the production of methane. Sudden losses (69%) in Methanosaetaceae were followed by a build-up of VFAs which were subsequently consumed when populations recovered. A build up of ammonium inhibited Methanosaetaceae and resulted in shifts from acetate to hydrogen utilization. Addition of trace elements and alkalinity when propionate levels were high stimulated microbial growth. Routine monitoring of microbial populations and VFAs provided valuable insights into the complex processes occurring within the digester and could be used to predict digester stability and facilitate digester optimization.
Collapse
Affiliation(s)
- Julie Williams
- Wales Centre of Excellence for Anaerobic Digestion, Sustainable Environment Research Centre (SERC), Faculty of Computing, Engineering and Science, University of South Wales, Pontypridd, Wales CF37 1DL, UK.
| | | | | | | | | |
Collapse
|