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Jiang S, Shang X, Chen G, Zhao M, Kong H, Huang Z, Zheng X. Effects of regular zooplankton supplement on the bacterial communities and process performance of biofilm for wastewater treatment. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 345:118933. [PMID: 37690248 DOI: 10.1016/j.jenvman.2023.118933] [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: 06/02/2023] [Revised: 08/24/2023] [Accepted: 09/02/2023] [Indexed: 09/12/2023]
Abstract
Biofilm processing technologies were widely used for wastewater treatment due to its advantages of low cost and easy management. However, the aging biofilms inevitably decrease the purification efficiency and increase the sludge production, which limited the widely application of biofilms technologies in rural area. In this study, we proposed a novel strategy by introducing high-trophic organisms to prey on low-trophic organisms, and reduce the aged biofilms and enhance treatment efficiencies in rural wastewater treatment. The effect of three typical zooplankton (Paramecium, Daphnia, and Rotifer) supplement on the purification efficiency and biofilm properties in the contact oxidation process were investigated, and the reaction conditions were optimized by an orthogonal experiment. Under optimal conditions, the biofilms weight decreased 67.6%, the oxygen consumption rate of biofilms increased 9.4%, and wastewater treatment efficiency was obviously increased after zooplankton supplement. Microbial sequencing results demonstrated that the zooplankton optimize the contact oxidation process by altering the bacterial genera mainly Diaphorobacter, Thermomonas, Alicycliphilus and Comamonas. This research provides insight into mechanism of the zooplankton supplement in biological contact oxidation process and provides a feasible strategy for improving the rural sewage treatment technology.
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Affiliation(s)
- Shunfeng Jiang
- College of Life and Environmental Science, Wenzhou University, Wenzhou, Zhejiang, 325035, PR China; State & Local Joint Engineering Research Center of Ecological Treatment Technology for Urban Water Pollution, Wenzhou, Zhejiang, 325035, PR China; Key Laboratory of Zhejiang Province for Water Environment and Marine Biological Resources Protection, Wenzhou, Zhejiang, 325035, PR China.
| | - Xiao Shang
- Shanghai Waterway Engineering Design and Consulting Co., Ltd., Shanghai, 200135, PR China.
| | - Gong Chen
- College of Life and Environmental Science, Wenzhou University, Wenzhou, Zhejiang, 325035, PR China; State & Local Joint Engineering Research Center of Ecological Treatment Technology for Urban Water Pollution, Wenzhou, Zhejiang, 325035, PR China; Key Laboratory of Zhejiang Province for Water Environment and Marine Biological Resources Protection, Wenzhou, Zhejiang, 325035, PR China.
| | - Min Zhao
- College of Life and Environmental Science, Wenzhou University, Wenzhou, Zhejiang, 325035, PR China; State & Local Joint Engineering Research Center of Ecological Treatment Technology for Urban Water Pollution, Wenzhou, Zhejiang, 325035, PR China; Key Laboratory of Zhejiang Province for Water Environment and Marine Biological Resources Protection, Wenzhou, Zhejiang, 325035, PR China.
| | - Hainan Kong
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, PR China.
| | - Zhao Huang
- Wenzhou Ecological Park Development and Construction Investment Group Co., Ltd, Wenzhou, Zhejiang, 325000, PR China.
| | - Xiangyong Zheng
- College of Life and Environmental Science, Wenzhou University, Wenzhou, Zhejiang, 325035, PR China; State & Local Joint Engineering Research Center of Ecological Treatment Technology for Urban Water Pollution, Wenzhou, Zhejiang, 325035, PR China; Key Laboratory of Zhejiang Province for Water Environment and Marine Biological Resources Protection, Wenzhou, Zhejiang, 325035, PR China.
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Almeida JR, León ES, Corona EL, Fradinho JC, Oehmen A, Reis MAM. Ammonia impact on the selection of a phototrophic - chemotrophic consortium for polyhydroxyalkanoates production under light-feast / dark-aerated-famine conditions. WATER RESEARCH 2023; 244:120450. [PMID: 37574626 DOI: 10.1016/j.watres.2023.120450] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2023] [Revised: 08/01/2023] [Accepted: 08/03/2023] [Indexed: 08/15/2023]
Abstract
Phototrophic polyhydroxyalkanoate (PHA) production is an emerging technology for recovering carbon and nutrients from diverse wastewater streams. However, reliable selection methods for the enrichment of PHA accumulating purple phototrophic bacteria (PPB) in phototrophic mixed cultures (PMC) are needed. This research evaluates the impact of ammonia on the selection of a PHA accumulating phototrophic-chemotrophic consortium, towards the enrichment of PHA accumulating PPB. The culture was operated under light-feast/dark-aerated-famine and winter simulated-outdoor conditions (13.2 ± 0.9 °C, transient light, 143.5 W/m2), using real fermented domestic wastewater with molasses as feedstock. Three ammonia supply strategies were assessed: 1) ammonia available only in the light phase, 2) ammonia always present and 3) ammonia available only during the dark-aerated-famine phase. Results showed that the PMC selected under 1) ammonia only in the light and 3) dark-famine ammonia conditions, presented the lowest PHA accumulation capacity during the light period (11.1 % g PHA/g VSS and 10.4 % g PHA/g VSS, respectively). In case 1), the absence of ammonia during the dark-aerated-famine phase did not promote the selection of PHA storing PPB, whereas in case 3) the absence of ammonia during the light period favoured cyanobacteria growth as well as purple sulphur bacteria with increased non-PHA inclusions, resulting in an overall decrease of phototrophic PHA accumulation capacity. The best PHA accumulation performance was obtained with selection under permanent presence of ammonia (case 2), which attained a PHA content of 21.6 % g PHA/g VSS (10.2 Cmmol PHA/L), at a production rate of 0.57 g PHA/L·day, during the light period in the selection reactor. Results in case 2 also showed that feedstock composition impacts the PMC performance, with feedstocks richer in more reduced volatile fatty acids (butyric and valeric acids) decreasing phototrophic performance and leading to acids entering the dark-aerated phase. Nevertheless, the presence of organic carbon in the aerated phase was not detrimental to the system. In fact, it led to the establishment of a phototrophic-chemotrophic consortium that could photosynthetically accumulate a PHA content of 13.2 % g PHA/g VSS (6.7 Cmmol PHA/L) at a production rate of 0.20 g PHA/L·day in the light phase, and was able to further increase that storage up to 18.5 % g PHA/g VSS (11.0 Cmmol PHA/L) at a production rate of 1.35 g PHA/L·day in the dark-aerated period. Furthermore, the light-feast/dark-aerated-famine operation was able to maintain the performance of the selection reactor under winter conditions, unlike non-aerated PMC systems operated under summer conditions, suggesting that night-time aeration coupled with the constant presence of ammonia can contribute to overcoming the seasonal constraints of outdoor operation of PMCs for PHA production.
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Affiliation(s)
- J R Almeida
- Associate Laboratory i4HB - Institute for Health and Bioeconomy, NOVA School of Science and Technology, NOVA University Lisbon, 2829-516 Caparica, Portugal; UCIBIO - Applied Molecular Biosciences Unit, Department of Chemistry, NOVA School of Science and Technology, NOVA University Lisbon, 2829-516 Caparica, Portugal
| | - E Serrano León
- FCC Servicios Ciudadanos, Av. del Camino de Santiago, 40, edificio 3, 4ª planta, 28050 Madrid, Spain
| | - E Lara Corona
- FCC Servicios Ciudadanos, Av. del Camino de Santiago, 40, edificio 3, 4ª planta, 28050 Madrid, Spain
| | - J C Fradinho
- Associate Laboratory i4HB - Institute for Health and Bioeconomy, NOVA School of Science and Technology, NOVA University Lisbon, 2829-516 Caparica, Portugal; UCIBIO - Applied Molecular Biosciences Unit, Department of Chemistry, NOVA School of Science and Technology, NOVA University Lisbon, 2829-516 Caparica, Portugal.
| | - A Oehmen
- UCIBIO - Applied Molecular Biosciences Unit, Department of Chemistry, NOVA School of Science and Technology, NOVA University Lisbon, 2829-516 Caparica, Portugal
| | - M A M Reis
- Associate Laboratory i4HB - Institute for Health and Bioeconomy, NOVA School of Science and Technology, NOVA University Lisbon, 2829-516 Caparica, Portugal; UCIBIO - Applied Molecular Biosciences Unit, Department of Chemistry, NOVA School of Science and Technology, NOVA University Lisbon, 2829-516 Caparica, Portugal
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3
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Zhou H, Chen C, Zhou S, Bu K, Li P, Lin X, Jiang L, Zhang C. Performance and microbial community analysis of a bio-contact oxidation reactor during the treatment of low-COD and high-salinity oilfield produced water. BIORESOURCE TECHNOLOGY 2021; 335:125267. [PMID: 33992912 DOI: 10.1016/j.biortech.2021.125267] [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: 03/21/2021] [Revised: 05/03/2021] [Accepted: 05/06/2021] [Indexed: 06/12/2023]
Abstract
The multistage bio-contact oxidation reactor (BCOR) is a widely used biological strategy to treat wastewater, however, little is known about the performance and microbial community information of BCOR during the treatment of low-COD and high-salinity oilfield produced water. In this study, the performance of a multistage BCOR in treating produced water was investigated. The result suggested the BCOR could efficiently remove COD, BOD5, NH4+-N, and oil pollutants. Besides, high-throughput sequencing analysis revealed that oil content was the main variable in shaping the community structure. The highest total relative abundance of potential pollutants degraders in first BCOR stage suggested significant role of this stage in pollutants removal. In addition, the correlation analysis disclosed the key functional genera during the degradation process, including Rhodobacter, Citreibacter, and Roseovarius. Moreover, network analysis revealed that the microbial taxa within same module had strong ecological linkages and specific functions.
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Affiliation(s)
- Hanghai Zhou
- Institute of Marine Biology, Ocean College, Zhejiang University, Zhoushan 316021, Zhejiang, China
| | - Chunlei Chen
- Institute of Marine Biology, Ocean College, Zhejiang University, Zhoushan 316021, Zhejiang, China
| | - Shaoxiong Zhou
- Xinjiang Keli New Technology Development Co., Ltd., Karamay 834000, Xinjiang, China
| | - Kuiyong Bu
- Xinjiang Keli New Technology Development Co., Ltd., Karamay 834000, Xinjiang, China
| | - Pingyuan Li
- Xinjiang Keli New Technology Development Co., Ltd., Karamay 834000, Xinjiang, China
| | - Xiaoyun Lin
- Institute of Marine Biology, Ocean College, Zhejiang University, Zhoushan 316021, Zhejiang, China
| | - Lijia Jiang
- Institute of Marine Biology, Ocean College, Zhejiang University, Zhoushan 316021, Zhejiang, China
| | - Chunfang Zhang
- Institute of Marine Biology, Ocean College, Zhejiang University, Zhoushan 316021, Zhejiang, China.
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4
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Application of real treated wastewater to starch production by microalgae: Potential effect of nutrients and microbial contamination. Biochem Eng J 2021. [DOI: 10.1016/j.bej.2021.107973] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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5
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Capson-Tojo G, Lin S, Batstone DJ, Hülsen T. Purple phototrophic bacteria are outcompeted by aerobic heterotrophs in the presence of oxygen. WATER RESEARCH 2021; 194:116941. [PMID: 33640750 DOI: 10.1016/j.watres.2021.116941] [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: 10/23/2020] [Revised: 02/14/2021] [Accepted: 02/15/2021] [Indexed: 06/12/2023]
Abstract
There is an ongoing debate around the effect of microaerobic/aerobic conditions on the wastewater treatment performance and stability of enriched purple phototrophic bacteria (PPB) cultures. It is well known that oxygen-induced oxidative conditions inhibit the synthesis of light harvesting complexes, required for photoheterotrophy. However, in applied research, several publications have reported efficient wastewater treatment at high dissolved oxygen (DO) levels. This study evaluated the impact of different DO concentrations (0-0.25 mg·L-1, 0-0.5 mg·L-1 and 0-4.5 mg·L-1) on the COD, nitrogen and phosphorus removal performances, the biomass yields, and the final microbial communities of PPB-enriched cultures, treating real wastewaters (domestic and poultry processing wastewater). The results show that the presence of oxygen suppressed photoheterotrophic growth, which led to a complete pigment and colour loss in a matter of 20-30 h after starting the batch. Under aerobic conditions, chemoheterotrophy was the dominant catabolic pathway, with wastewater treatment performances similar to those achieved in common aerobic reactors, rather than those corresponding to phototrophic systems (i.e. considerable total COD decrease (45-57% aerobically vs. ± 10% anaerobically). This includes faster consumption of COD and nutrients, lower nutrient removal efficiencies (50-58% vs. 72-99% for NH4+-N), lower COD:N:P substrate ratios (100:4.5-5.0:0.4-0.8 vs. 100:6.7-12:0.9-1.2), and lower apparent biomass yields (0.15-0.31 vs. 0.8-1.2 g CODbiomass·g CODremoved-1)). The suppression of photoheterotrophy inevitably resulted in a reduction of the relative PPB abundances in all the aerated tests (below 20% at the end of the tests), as PPB lost their main competitive advantage against competing aerobic heterotrophic microbes. This was explained by the lower aerobic PPB growth rates (2.4 d-1 at 35 °C) when compared to common growth rates for aerobic heterotrophs (6.0 d-1 at 20 °C). Therefore, PPB effectively outcompete other microbes under illuminated-anaerobic conditions, but not under aerobic or even micro-aerobic conditions, as shown by continuously aerated tests controlled at undetectable DO levels. While their aerobic heterotrophic capabilities provide some resilience, at non-sterile conditions PPB cannot dominate when growing chemoheterotrophically, and will be outcompeted.
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Affiliation(s)
- Gabriel Capson-Tojo
- Advanced Water Management Centre, The University of Queensland, Brisbane, QLD 4072, Australia; CRETUS Institute, Department of Chemical Engineering, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Galicia, Spain
| | - Shengli Lin
- Advanced Water Management Centre, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Damien J Batstone
- Advanced Water Management Centre, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Tim Hülsen
- Advanced Water Management Centre, The University of Queensland, Brisbane, QLD 4072, Australia.
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6
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Mohammadi F, Bina B, Amin MM, Pourzamani HR, Yavari Z, Shams MR. Evaluation of the effects of AlkylPhenolic compounds on kinetic parameters in a moving bed biofilm reactor. CAN J CHEM ENG 2018. [DOI: 10.1002/cjce.23115] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Farzaneh Mohammadi
- Department of Environmental Health Engineering; School of Health; Isfahan University of Medical Sciences; Isfahan Iran
- Student Research Committee; Isfahan University of Medical Sciences; Isfahan Iran
| | - Bijan Bina
- Environment Research Center; Research Institute for Primordial Prevention of Non-communicable Disease; Isfahan University of Medical Sciences; Isfahan Iran
- Department of Environmental Health Engineering; School of Health; Isfahan University of Medical Sciences; Isfahan Iran
| | - Mohammad Mehdi Amin
- Environment Research Center; Research Institute for Primordial Prevention of Non-communicable Disease; Isfahan University of Medical Sciences; Isfahan Iran
- Department of Environmental Health Engineering; School of Health; Isfahan University of Medical Sciences; Isfahan Iran
| | - Hamid Reza Pourzamani
- Environment Research Center; Research Institute for Primordial Prevention of Non-communicable Disease; Isfahan University of Medical Sciences; Isfahan Iran
- Department of Environmental Health Engineering; School of Health; Isfahan University of Medical Sciences; Isfahan Iran
| | - Zeynab Yavari
- Department of Environmental Health Engineering; School of Health; Isfahan University of Medical Sciences; Isfahan Iran
- Student Research Committee; Isfahan University of Medical Sciences; Isfahan Iran
| | - Mohammad Reza Shams
- Civil Engineering Department; Isfahan University of Technology; Isfahan Iran
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7
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Puyol D, Barry EM, Hülsen T, Batstone DJ. A mechanistic model for anaerobic phototrophs in domestic wastewater applications: Photo-anaerobic model (PAnM). WATER RESEARCH 2017; 116:241-253. [PMID: 28347950 DOI: 10.1016/j.watres.2017.03.022] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2016] [Revised: 03/07/2017] [Accepted: 03/08/2017] [Indexed: 06/06/2023]
Abstract
Purple phototrophic bacteria (PPB) have been recently proposed as a key potential mechanism for accumulative biotechnologies for wastewater treatment with total nutrient recovery, low greenhouse gas emissions, and a neutral to positive energy balance. Purple phototrophic bacteria have a complex metabolism which can be regulated for process control and optimization. Since microbial processes governing PPB metabolism differ from traditional processes used for wastewater treatment (e.g., aerobic and anaerobic functional groups in ASM and ADM1), a model basis has to be developed to be used as a framework for further detailed modelling under specific situations. This work presents a mixed population phototrophic model for domestic wastewater treatment in anaerobic conditions. The model includes photoheterotrophy, which is divided into acetate consumption and other organics consumption, chemoheterotrophy (including simplified fermentation and anaerobic oxidation) and photoautotrophy (using hydrogen as an electron donor), as microbial processes, as well as hydrolysis and biomass decay as biochemical processes, and is single-biomass based. The main processes have been evaluated through targeted batch experiments, and the key kinetic and stoichiometric parameters have been determined. The process was assessed by analyzing a continuous reactor simulation scenario within a long-term wastewater treatment system in a photo-anaerobic membrane bioreactor.
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Affiliation(s)
- D Puyol
- Advanced Water Management Centre, Gehrmann Building, The University of Queensland, Brisbane, Queensland 4072, Australia; CRC for Water Sensitive Cities, PO Box 8000, Clayton, Victoria, 3800, Australia; Group of Chemical and Environmental Engineering (GIQA), University Rey Juan Carlos, 28933 Mostoles, Madrid, Spain.
| | - E M Barry
- Advanced Water Management Centre, Gehrmann Building, The University of Queensland, Brisbane, Queensland 4072, Australia; CRC for Water Sensitive Cities, PO Box 8000, Clayton, Victoria, 3800, Australia
| | - T Hülsen
- Advanced Water Management Centre, Gehrmann Building, The University of Queensland, Brisbane, Queensland 4072, Australia; CRC for Water Sensitive Cities, PO Box 8000, Clayton, Victoria, 3800, Australia
| | - D J Batstone
- Advanced Water Management Centre, Gehrmann Building, The University of Queensland, Brisbane, Queensland 4072, Australia; CRC for Water Sensitive Cities, PO Box 8000, Clayton, Victoria, 3800, Australia
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8
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Justo AJ, Junfeng L, Lili S, Haiman W, Lorivi MR, Mohammed MOA, Xiangtong Z, Yujie F. Integrated expanded granular sludge bed and sequential batch reactor treating beet sugar industrial wastewater and recovering bioenergy. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2016; 23:21032-21040. [PMID: 27488718 DOI: 10.1007/s11356-016-7307-8] [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: 05/31/2016] [Accepted: 07/21/2016] [Indexed: 06/06/2023]
Abstract
The exponential rise in energy demand vis-à-vis depletion of mineral oil resources has accelerated recovery of bioenergy from organic waste. In this study, a laboratory-scale anaerobic (An)/aerobic (Ar) system comprising of expanded granular sludge bed (EGSB) reactor coupled to an aerobic sequential batch reactor (SBR) was constructed to treat beet sugar industrial wastewater (BSIW) of chemical oxygen demand (COD) 1665 mg L-1 while harnessing methane gas. The EGSB reactor generated methane at the rate of 235 mL/g COD added, with considerably higher than previously reported methane content of 86 %. Meanwhile, contaminants were successfully reduced in the combined An/Ar system, realizing a removal rate of more than 71.4, 97.3, 97.7, and 99.3 % of organic matter as total phosphorus, total nitrogen, biological oxygen demand (BOD), and soluble COD, respectively. Microbial community analysis showed that the bacterial genus Clostridium sp. and archaeal genus Methanosaeta sp. dominated the EGSB reactor, while Rhodobacter sp. dominance was observed in the SBR. The obtained experimental results indicate that the integration of expanded granular sludge bed and sequential batch reactor in treating BSIW obtained competitively outstanding performance.
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Affiliation(s)
- Ambuchi John Justo
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, 73 Huanghe Road, Harbin, 150090, People's Republic of China
| | - Liu Junfeng
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, 73 Huanghe Road, Harbin, 150090, People's Republic of China
| | - Shan Lili
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, 73 Huanghe Road, Harbin, 150090, People's Republic of China
| | - Wang Haiman
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, 73 Huanghe Road, Harbin, 150090, People's Republic of China
| | - Moirana Ruth Lorivi
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, 73 Huanghe Road, Harbin, 150090, People's Republic of China
| | - Mohammed O A Mohammed
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, 73 Huanghe Road, Harbin, 150090, People's Republic of China
| | - Zhou Xiangtong
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, 73 Huanghe Road, Harbin, 150090, People's Republic of China
| | - Feng Yujie
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, 73 Huanghe Road, Harbin, 150090, People's Republic of China.
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9
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Yang A, Zhang X, Agogué H, Dupuy C, Gong J. Contrasting spatiotemporal patterns and environmental drivers of diversity and community structure of ammonia oxidizers, denitrifiers, and anammox bacteria in sediments of estuarine tidal flats. ANN MICROBIOL 2014. [DOI: 10.1007/s13213-014-0929-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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González-Martínez A, Calderón K, Albuquerque A, Hontoria E, González-López J, Guisado IM, Osorio F. Biological and technical study of a partial-SHARON reactor at laboratory scale: effect of hydraulic retention time. Bioprocess Biosyst Eng 2012; 36:173-84. [PMID: 22767397 DOI: 10.1007/s00449-012-0772-7] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2012] [Accepted: 06/09/2012] [Indexed: 11/30/2022]
Abstract
This study was on the technical and biological characteristics of a partial-SHARON submerged-filter bioreactor of 3 L. The main focus was the influence of the hydraulic retention time (HRT) on biofilms. For this purpose, we used molecular tools based on the partial 16S rRNA genes. The results showed that the HRT may affect the nitrification processes of a bioreactor using synthetic wastewater containing 600 mg/L of ammonia. It was found that an HRT of 0.5 day transformed 100 % of the ammonium into nitrite. However, when the HRT was decreased to 0.4 day, there was a significant reduction (35 %) in the quantity of ammonia transformed, which confirmed the complexity of the system operation. Moreover, a PCR-TGGE approach highlighted the differences observed. The results obtained showed that an HRT of 0.5 day reduced bacterial biodiversity in the biofilms, which were mainly formed by Nitrosomonas and Diaphorobacter. In contrast, an HRT of 0.4 day facilitated the formation of heterogeneous biofilms formed by nitrifying bacteria, such as Nitrosomonas sp., Nitrosospira sp., and Nitrosovibrio sp.).
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Affiliation(s)
- A González-Martínez
- Department of Civil Engineering, University of Granada, Campus de Fuentenueva, Spain
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11
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Hsiao TH, Huang JS, Huang YI. Process kinetics of an activated-sludge reactor system treating poultry slaughterhouse wastewater. ENVIRONMENTAL TECHNOLOGY 2012; 33:829-835. [PMID: 22720406 DOI: 10.1080/09593330.2011.597782] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The principal objective was to generate the essential kinetic parameters for model simulation and operation management of an activated-sludge reactor (ASR) system treating poultry slaughterhouse wastewater. By varying four different mean cell residence times (theta(c) = 4.6-24.3 d), the ASR system (26 degrees C) removed effectively 93.5%-97.2% of chemical oxygen demand (COD) from wastewater. Ifa high COD removal efficiency and a low effluent volatile suspended solids (VSS) concentration are of great concern, a theta(c) of 15-24 d or a food to microorganism (F/M) ratio of 0.3-0.7 kg COD/kg VSS-d is suggested; if resource sustainability and enhanced operation of the ASR system are of great concern, a theta(c) of 9 d or an F/M ratio of 0.9 kg COD/kg VSS-d is suggested. The COD residual concentrations and COD removal efficiencies calculated by using the Monod model agreed well with the experimental results. When the parameters k and Ks (deltaP/P) were respectively varied from -100% to +100%, the parametric sensitivity analysis showed that the COD residual concentration change (deltaS/S) was highly sensitive to k in the deltaP/P range between 0% and -40%, causing a marked increase in COD residual concentration.
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Affiliation(s)
- Ting-Hsun Hsiao
- Department of Bio-Industrial Mechatronics Engineering, National Chung Hsing University, Taichung City, Taiwan, ROC
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12
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Liang SH, Liu JK, Lee KH, Kuo YC, Kao CM. Use of specific gene analysis to assess the effectiveness of surfactant-enhanced trichloroethylene cometabolism. JOURNAL OF HAZARDOUS MATERIALS 2011; 198:323-330. [PMID: 22071259 DOI: 10.1016/j.jhazmat.2011.10.050] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2011] [Revised: 10/09/2011] [Accepted: 10/17/2011] [Indexed: 05/31/2023]
Abstract
The objective of this study was to evaluate the effectiveness of in situ bioremediation of trichloroethylene (TCE)-contaminated groundwater using specific gene analyses under the following conditions: (1) pretreatment with biodegradable surfactants [Simple Green™ (SG) and soya lecithin (SL)] to enhance TCE desorption and dissolution, and (2) supplementation with SG, SL, and cane molasses as primary substrates to enhance the aerobic cometabolism of TCE. Polymerase chain reaction (PCR), denaturing gradient gel electrophoresis (DGGE), and nucleotide sequence analysis were applied to monitor the variations in specific activity-dependent enzymes and dominant microorganisms. Results show that TCE-degrading enzymes, including toluene monooxygenase, toluene dioxygenase, and phenol monooxygenase, were identified from sediment samples collected from a TCE-spill site. Results from the microcosm study show that addition of SG, SL, or cane molasses can enhance the aerobic cometabolism of TCE. The TCE degradation rates were highest in microcosms with added SL, the second highest in microcosms containing SG, and lowest in microcosms containing cane molasses. This indicates that SG and SL can serve as TCE dissolution agents and act as primary substrates for indigenous microorganisms. Four dominant microorganisms (Rhodobacter sp., Methyloversatilis sp., Beta proteobacterium sp., and Hydrogenophaga pseudoflava) observed in microcosms might be able to produce TCE-degrading enzymes for TCE cometabolic processes.
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Affiliation(s)
- S H Liang
- Institute of Environmental Engineering, National Sun Yat-Sen University, Kaohsiung 804, Taiwan
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13
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Okubo Y, Hiraishi A. Population Dynamics and Acetate Utilization Kinetics of Two Different Species of Phototrophic Purple Nonsulfur Bacteria in a Continuous Co-culture System. Microbes Environ 2007. [DOI: 10.1264/jsme2.22.82] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- Yoko Okubo
- Department of Ecological Engineering, Toyohashi University of Technology
| | - Akira Hiraishi
- Department of Ecological Engineering, Toyohashi University of Technology
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14
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Xia MS, Hu CH, Zhang HM. Effects of tourmaline addition on the dehydrogenase activity of Rhodopseudomonas palustris. Process Biochem 2006. [DOI: 10.1016/j.procbio.2005.05.012] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Okubo Y, Futamata H, Hiraishi A. Distribution and Capacity for Utilization of Lower Fatty Acids of Phototrophic Purple Nonsulfur Bacteria in Wastewater Environments. Microbes Environ 2005. [DOI: 10.1264/jsme2.20.135] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- Yoko Okubo
- Department of Ecological Engineering, Toyohashi University of Technology
| | - Hiroyuki Futamata
- Department of Ecological Engineering, Toyohashi University of Technology
| | - Akira Hiraishi
- Department of Ecological Engineering, Toyohashi University of Technology
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