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Mahdy A, Song Y, Salama A, Qiao W, Dong R. Simultaneous H 2S mitigation and methanization enhancement of chicken manure through the introduction of the micro-aeration approach. CHEMOSPHERE 2020; 253:126687. [PMID: 32298914 DOI: 10.1016/j.chemosphere.2020.126687] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2019] [Revised: 03/30/2020] [Accepted: 03/31/2020] [Indexed: 06/11/2023]
Abstract
The impact on H2S alleviation and methane yield enhancement after submitting the anaerobic digestion of chicken manure to a finite amount of air was investigated. The largest reduction in the H2S biogas content (58% lower) occurred when air intensity of 30 ml/g VSin was injected into the reactors. Consequently, a maximum methane yield (335 mL-g VSin-1), which was 77% higher than the control, was concurrently achieved. Slight sulfate accumulation (<330 mg L-1) was observed inside the micro-aerated digesters with higher air intensities, suggesting a suppression of sulfide inhibition. Bacterial diversity/richness was enhanced in these digesters while the relative abundance of Methanocelleus increased by 36%. The most important contributing factor to enhancement was the synergistic effect resulting from increments in the hydrolysis rate and the suppression of sulfide inhibition. The results highlighted the potential of in situ H2S mitigation with the added benefit of methane yield enhancement.
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Affiliation(s)
- Ahmed Mahdy
- College of Engineering, China Agricultural University, Beijing, 100083, China; Department of Agricultural Microbiology, Faculty of Agriculture, Zagazig University, 44511, Zagazig, Egypt
| | - Yunlong Song
- College of Engineering, China Agricultural University, Beijing, 100083, China; State R&D Center for Efficient Production and Comprehensive Utilization of Biobased Gaseous Fuels, Energy Authority, National Development, and Reform Committee, Beijing, 100083, China
| | - Ali Salama
- Department of Agricultural Microbiology, Faculty of Agriculture, Zagazig University, 44511, Zagazig, Egypt
| | - Wei Qiao
- College of Engineering, China Agricultural University, Beijing, 100083, China; State R&D Center for Efficient Production and Comprehensive Utilization of Biobased Gaseous Fuels, Energy Authority, National Development, and Reform Committee, Beijing, 100083, China.
| | - Renjie Dong
- College of Engineering, China Agricultural University, Beijing, 100083, China; State R&D Center for Efficient Production and Comprehensive Utilization of Biobased Gaseous Fuels, Energy Authority, National Development, and Reform Committee, Beijing, 100083, China
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2
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Barati rashvanlou R, Rezaee A, Farzadkia M, Gholami M, Kermani M. Effect of micro-aerobic process on improvement of anaerobic digestion sewage sludge treatment: flow cytometry and ATP assessment. RSC Adv 2020; 10:35718-35728. [PMID: 35517111 PMCID: PMC9056904 DOI: 10.1039/d0ra05540a] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2020] [Accepted: 08/07/2020] [Indexed: 11/21/2022] Open
Abstract
Micro-aeration as a pretreatment method improves the efficiency of anaerobic digestion of municipal sewage sludge and consequently promotes the methane production. In this study, adenosine triphosphate (ATP) and flow cytometry (FCM) were employed to monitor the performance of the micro-aerobic process and investigate the survival of bacterial cells within the process. At first, the effect of air flow rate (AFR) (0.1, 0.2, 0.3 and 0.5 vvm) on hydrolysis of mixed sludge in 5 aeration cycles (20, 30, 40, 48 and 60 hours) was examined. Then, the effects of the micro aerobic process on methane (CH4) production in anaerobic digestion were surveyed. The highest VSS reduction was 30.6% and 10.4% for 40 hours in the reactor and control, respectively. Soluble COD also fluctuated between 40.87 and 65.14% in micro-aerobic conditions; the highest SCOD was achieved at the time of 40 h. Microbial activities were increased by 597%, 170% and 79.4% for 20, 30 and 40 h pretreatment with the micro-aerobic process, respectively. Apoptosis assay showed that micro-aerobic pre-treatment at 20, 30 and 40 h increased the percentage of living cells by 57.4, 62.8 and 67.9%, respectively. On the other hand, FCM results showed that the highest percentage of viable bacteria (i.e., 67.9%) was observed at 40 h pretreating which was approximately 40% higher the ones for the control. Variation in cumulative methane production shows that methane production was increased by 221% compared to anaerobic digestion (control group). Therefore, ATP and FCM can be employed as two appropriate, accurate, relatively specific indicators for monitoring the process and bacteria viability. Micro-aeration as a pretreatment method improves the efficiency of anaerobic digestion of municipal sewage sludge and consequently promotes the methane production.![]()
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Affiliation(s)
- Reza Barati rashvanlou
- Research Center for Environmental Health Technology
- Iran University of Medical Sciences
- Tehran
- Iran
- Department of Environmental Health Engineering
| | - Abbas Rezaee
- Department of Environmental Health Engineering
- Faculty of Medical Sciences
- Tarbiat Modares University
- Tehran
- Iran
| | - Mahdi Farzadkia
- Research Center for Environmental Health Technology
- Iran University of Medical Sciences
- Tehran
- Iran
- Department of Environmental Health Engineering
| | - Mitra Gholami
- Research Center for Environmental Health Technology
- Iran University of Medical Sciences
- Tehran
- Iran
- Department of Environmental Health Engineering
| | - Majid Kermani
- Research Center for Environmental Health Technology
- Iran University of Medical Sciences
- Tehran
- Iran
- Department of Environmental Health Engineering
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3
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Sousa MR, Oliveira CJS, Carneiro JM, Lopes AC, Rodríguez E, Vasconcelos EAF, Holanda GBM, Landim PGC, Silva MER, Firmino PIM, Dos Santos AB. Evaluation of different air dosing strategies to enhance H 2S removal in microaerobic systems treating low-strength wastewaters. ENVIRONMENTAL TECHNOLOGY 2019; 40:3724-3734. [PMID: 29888986 DOI: 10.1080/09593330.2018.1487470] [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: 09/28/2017] [Accepted: 05/30/2018] [Indexed: 06/08/2023]
Abstract
This study aimed to evaluate different air dosing strategies such as microaeration flow rates and air dosing points to enhance H2S removal in microaerobic systems treating low-strength wastewaters. Efficiency and stability of the reactors, as well as biogas quality, were assessed, and microbial community changes were evaluated using the PCR-DGGE technique. The results showed that the air dosing point affected the H2S concentration and that air dosing at the headspace promoted the highest H2S removal efficiency. The airflow rate also affected the process, since H2S concentration in the biogas was higher at 0.1 mL air.min-1 than at 0.3 mL air.min-1. The methane concentration in the biogas was also affected by both air dosing point and flow rate, since the lowest value was observed at the highest airflow rate of the headspace dosing point, due to dilution by the N2 influx applied to the system. The highest productivity and operational efficiency were observed at this air dosing point, with this airflow (HD0.3), which corroborates with the operational results and the ecological parameters, since the microaeration at this stage promoted high bacterial and archaeal species richness and diversity, optimum functional organization, high COD and H2S removal efficiencies.
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Affiliation(s)
- M R Sousa
- Department of Hydraulic and Environmental Engineering, Federal University of Ceará, Fortaleza, Ceará, Brazil
| | - C J S Oliveira
- Department of Hydraulic and Environmental Engineering, Federal University of Ceará, Fortaleza, Ceará, Brazil
| | - J M Carneiro
- Department of Hydraulic and Environmental Engineering, Federal University of Ceará, Fortaleza, Ceará, Brazil
| | - A C Lopes
- Department of Hydraulic and Environmental Engineering, Federal University of Ceará, Fortaleza, Ceará, Brazil
| | - E Rodríguez
- Department of Hydraulic and Environmental Engineering, Federal University of Ceará, Fortaleza, Ceará, Brazil
| | - E A F Vasconcelos
- Department of Hydraulic and Environmental Engineering, Federal University of Ceará, Fortaleza, Ceará, Brazil
| | - G B M Holanda
- Department of Hydraulic and Environmental Engineering, Federal University of Ceará, Fortaleza, Ceará, Brazil
| | - P G C Landim
- Department of Hydraulic and Environmental Engineering, Federal University of Ceará, Fortaleza, Ceará, Brazil
| | - M E R Silva
- Department of Civil Construction, Federal Institute of Science and Technology of Ceará, Fortaleza, Ceará, Brazil
| | - P I M Firmino
- Department of Hydraulic and Environmental Engineering, Federal University of Ceará, Fortaleza, Ceará, Brazil
| | - A B Dos Santos
- Department of Hydraulic and Environmental Engineering, Federal University of Ceará, Fortaleza, Ceará, Brazil
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4
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Du Z, Xiao Y, Qi X, Liu Y, Fan X, Li Z. Peanut-Shell Biochar and Biogas Slurry Improve Soil Properties in the North China Plain: A Four-Year Field Study. Sci Rep 2018; 8:13724. [PMID: 30214025 PMCID: PMC6137124 DOI: 10.1038/s41598-018-31942-0] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2018] [Accepted: 08/28/2018] [Indexed: 11/23/2022] Open
Abstract
Biochar and biogas slurry have been proved to improve the quality of some soil types, but the long-term effects on fluvo-aquic soil are not fully understood. This study aimed to compare the continuity effects of peanut-shell biochar and biogas slurry on the physicochemical properties, microbial population size, and enzyme activities of fluvo-aquic soil. We conducted a four-year field experiment of winter wheat-summer maize rotation in the North China Plain. Along with equal nitrogen inputs, three treatments were applied—conventional fertilizers, peanut-shell biochar, and hoggery biogas slurry—after which various soil quality indicators were compared. Compared with those of control, both biochar and biogas slurry increased the soil total nitrogen and organic matter content, and improved soil aggregation, microbial biomass, and actinomycetes. Biogas slurry decreased soil pH and improved urease and protease activities. With biochar and biogas slurry treatments, wheat yield increased by 8.46% and 23.47%, and maize yield by 18% and 15.46%, respectively. Biogas slurry increased the content of crude protein and starch in the grains. Both biogas slurry and peanut-shell biochar improved fluvo-aquic soil nutrient content, water-stable macroaggregates, and microbial population, which might be related to their high nutrient content, large specific surface area, adsorption capacity, and functional groups. Biogas slurry generally exhibited stronger effects than biochar probably because of its richness in nutrients and bioactive substances.
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Affiliation(s)
- Zhenjie Du
- Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang, 453003, China. .,Agriculture Water and Soil Environmental Field Science Research Station of Xinxiang City of Henan Province of CAAS, Xinxiang, 453003, China. .,College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, 210095, China.
| | - Yatao Xiao
- Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang, 453003, China.,Agriculture Water and Soil Environmental Field Science Research Station of Xinxiang City of Henan Province of CAAS, Xinxiang, 453003, China
| | - Xuebin Qi
- Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang, 453003, China. .,Agriculture Water and Soil Environmental Field Science Research Station of Xinxiang City of Henan Province of CAAS, Xinxiang, 453003, China.
| | - Yuan Liu
- Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang, 453003, China
| | - Xiangyang Fan
- Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang, 453003, China.,Agriculture Water and Soil Environmental Field Science Research Station of Xinxiang City of Henan Province of CAAS, Xinxiang, 453003, China
| | - Zhongyang Li
- Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang, 453003, China.,Agriculture Water and Soil Environmental Field Science Research Station of Xinxiang City of Henan Province of CAAS, Xinxiang, 453003, China
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5
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Pokorna-Krayzelova L, Bartacek J, Vejmelkova D, Alvarez AA, Slukova P, Prochazka J, Volcke EI, Jenicek P. The use of a silicone-based biomembrane for microaerobic H2S removal from biogas. Sep Purif Technol 2017. [DOI: 10.1016/j.seppur.2017.07.077] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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6
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The Influence of Micro-Oxygen Addition on Desulfurization Performance and Microbial Communities during Waste-Activated Sludge Digestion in a Rusty Scrap Iron-Loaded Anaerobic Digester. ENERGIES 2017. [DOI: 10.3390/en10020258] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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7
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Wu M, Zhang Y, Ye Y, Lin C. In situ Removal of Hydrogen Sulfide During Biogas Fermentation at Microaerobic Condition. Appl Biochem Biotechnol 2016; 180:817-825. [PMID: 27250342 DOI: 10.1007/s12010-016-2135-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2016] [Accepted: 05/10/2016] [Indexed: 12/25/2022]
Abstract
In this paper, rice straw was used as a raw material to produce biogas by anaerobic batch fermentation at 35 °C (mesophilic) or 55 °C (thermophilic). The hydrogen sulfide in biogas can be converted to S0 or sulfate and removed in-situ under micro-oxygen environment. Trace oxygen was conducted to the anaerobic fermentation tank in amount of 0.5, 1.0, 2.0, 3.0, 4.0, 5.0, or 10.0 times stoichiometric equivalence, respectively, and the control experiment without oxygen addition was carried out. The results showed that the initial H2S concentrations of biogas are about 3235 ± 185 mg/m3 (mesophilic) or 3394 ± 126 mg/m3 (thermophilic), respectively. The desulfurization efficiency is 72.3 % (mesophilic) or 65.6 % (thermophilic), respectively, with oxygen addition by stoichiometric relation. When the oxygen feeded in amount of 2∼4 times, theoretical quantity demanded the removal efficiency of hydrogen sulfide could be over 92 %, and the oxygen residue in biogas could be maintained less than 0.5 %, which fit the requirement of biogas used as vehicle fuel or combined to the grid. Though further more oxygen addition could promote the removal efficiency of hydrogen sulfide (about 93.6 %), the oxygen residue in biogas would be higher than the application limit concentration (0.5 %). Whether mesophilic or thermophilic fermentation with the extra addition of oxygen, there were no obvious changes in the gas production and methane concentration. In conclusion, in-situ desulfurization can be achieved in the anaerobic methane fermentation system under micro-oxygen environment. In addition, air could be used as a substitute oxygen resource on the situation without strict demand for the methane content of biogas.
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Affiliation(s)
- Mengmeng Wu
- College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou, 310014, People's Republic of China
| | - Yima Zhang
- College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou, 310014, People's Republic of China
| | - Yuanyuan Ye
- College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou, 310014, People's Republic of China
| | - Chunmian Lin
- College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou, 310014, People's Republic of China.
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8
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Strategies for manipulation of oxygen utilization by the electron transfer chain in microbes for metabolic engineering purposes. J Ind Microbiol Biotechnol 2016; 44:647-658. [PMID: 27800562 DOI: 10.1007/s10295-016-1851-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2016] [Accepted: 10/06/2016] [Indexed: 12/14/2022]
Abstract
Microaerobic growth is of importance in ecological niches, pathogenic infections and industrial production of chemicals. The use of low levels of oxygen enables the cell to gain energy and grow more robustly in the presence of a carbon source that can be oxidized and provide electrons to the respiratory chain in the membrane. A considerable amount of information is available on the genes and proteins involved in respiratory growth and the regulation of genes involved in aerobic and anaerobic metabolism. The dependence of regulation on sensing systems that respond to reduced quinones (e.g. ArcB) or oxygen levels that affect labile redox components of transcription regulators (Fnr) are key in understanding the regulation. Manipulation of the amount of respiration can be difficult to control in dense cultures or inadequately mixed reactors leading to inhomogeneous cultures that may have lower than optimal performance. Efforts to control respiration through genetic means have been reported and address mutations affecting components of the electron transport chain. In a recent report completion for intermediates of the ubiquinone biosynthetic pathway was used to dial the level of respiration vs lactate formation in an aerobically grown E. coli culture.
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9
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Technical, Economical, and Microbiological Aspects of the Microaerobic Process on H 2S Removal for Low Sulfate Concentration Wastewaters. Appl Biochem Biotechnol 2016; 180:1386-1400. [PMID: 27364332 DOI: 10.1007/s12010-016-2174-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2016] [Accepted: 06/20/2016] [Indexed: 10/21/2022]
Abstract
We studied the feasibility of the microaerobic process, in comparison with the traditional chemical absorption process (NaOH), on H2S removal in order to improve the biogas quality. The experiment consisted of two systems: R1, biogas from an anaerobic reactor was washed in a NaOH solution, and R2, headspace microaeration with atmospheric air in a former anaerobic reactor. The microaeration used for low sulfate concentration wastewater did not affect the anaerobic digestion, but even increased system stability. Methane production in the R2 was 14 % lower compared to R1, due to biogas dilution by the atmospheric air used. The presence of oxygen in the biogas reveals that not all the oxygen was consumed for sulfide oxidation in the liquid phase indicating mass transfer limitations. The reactor was able to rapidly recover its capacity on H2S removal after an operational failure. Bacterial and archaeal richness shifted due to changes in operational parameters, which match with the system functioning. Finally, the microaerobic system seems to be more advantageous for both technical and economical reasons, in which the payback of microaerobic process for H2S removal was 4.7 months.
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10
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Zhang L, Marsh N, Long D, Wei M, Morrison M, Rickard CM. Microbial diversity on intravascular catheters from paediatric patients. Eur J Clin Microbiol Infect Dis 2015; 34:2463-70. [PMID: 26515578 DOI: 10.1007/s10096-015-2504-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2015] [Accepted: 10/05/2015] [Indexed: 11/24/2022]
Abstract
Microorganisms play important roles in intravascular catheter (IVC)-related infections, which are the most serious complications in children with IVCs, leading to increased hospitalisation, intensive care admissions, extensive antibiotic treatment and mortality. A greater understanding of bacterial communities is needed in order to improve the management of infections. We describe here the systematic culture-independent evaluation of IVC bacteriology in IVC biofilms. Twenty-four IVC samples (six peripherally inserted central catheters, eight central venous catheters and ten arterial catheters) were collected from 24 paediatric patients aged 0 to 14 years old. Barcoded amplicon libraries produced from genes coding 16S rRNA and roll-plate culture methods were used to determine the microbial composition of these samples. From a total of 1,043,406 high-quality sequence reads, eight microbial phyla and 136 diverse microbial genera were detected, separated into 12,224 operational taxonomic units (OTUs). Three phyla (Actinobacteria, Firmicutes and Proteobacteria) predominate the microorganism on the IVC surfaces, with Firmicutes representing nearly half of the OTUs found. Among the Firmicutes, Staphylococcus (15.0% of 16S rRNA reads), Streptococcus (9.6%) and Bacillus (6.1%) were the most common. Community composition did not appear to be affected by patients' age, gender, antibiotic treatment or IVC type. Differences in IVC microbiota were more likely associated with events arising from catheter dwell time, rather than the type of IVC used.
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Affiliation(s)
- L Zhang
- AVATAR Group, Research Centre for Health Practice Innovation, Menzies Health Institute Queensland, Griffith University, Brisbane, Australia. .,Translational Research Institute, The University of Queensland Diamantina Institute, Woolloongabba, Brisbane, Australia. .,Griffith University, N48 Nathan Campus, 170 Kessels Road, Nathan, QLD, 4111, Australia.
| | - N Marsh
- AVATAR Group, Research Centre for Health Practice Innovation, Menzies Health Institute Queensland, Griffith University, Brisbane, Australia.,Centre for Clinical Nursing, Royal Brisbane and Women's Hospital, Herston, Brisbane, Australia
| | - D Long
- AVATAR Group, Research Centre for Health Practice Innovation, Menzies Health Institute Queensland, Griffith University, Brisbane, Australia.,Paediatric Intensive Care Unit, Lady Cilento Children's Hospital, Brisbane, Australia
| | - M Wei
- School of Medical Science, Menzies Health Institute Queensland, Griffith University, Gold Coast campus, Southport, Australia
| | - M Morrison
- Translational Research Institute, The University of Queensland Diamantina Institute, Woolloongabba, Brisbane, Australia
| | - C M Rickard
- AVATAR Group, Research Centre for Health Practice Innovation, Menzies Health Institute Queensland, Griffith University, Brisbane, Australia.,Centre for Clinical Nursing, Royal Brisbane and Women's Hospital, Herston, Brisbane, Australia
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11
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Díaz I, Ramos I, Fdz-Polanco M. Economic analysis of microaerobic removal of H2S from biogas in full-scale sludge digesters. BIORESOURCE TECHNOLOGY 2015; 192:280-286. [PMID: 26046427 DOI: 10.1016/j.biortech.2015.05.048] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2015] [Revised: 05/12/2015] [Accepted: 05/14/2015] [Indexed: 06/04/2023]
Abstract
The application of microaerobic conditions during sludge digestion has been proven to be an efficient method for H2S removal from biogas. In this study, three microaerobic treatments were considered as an alternative to the technique of biogas desulfurization applied (FeCl3 dosing to the digesters) in a WWTP comprising three full-scale anaerobic reactors treating sewage sludge, depending on the reactant: pure O2 from cryogenic tanks, concentrated O2 from PSA generators, and air. These alternatives were compared in terms of net present value (NPV) with a fourth scenario consisting in the utilization of iron-sponge-bed filter inoculated with thiobacteria. The analysis revealed that the most profitable alternative to FeCl3 addition was the injection of concentrated O2 (0.0019 €/m(3) biogas), and this scenario presented the highest robustness towards variations in the price of FeCl3, electricity, and in the H2S concentration.
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Affiliation(s)
- I Díaz
- Department of Chemical Engineering and Environmental Technology, Escuela de Ingenierías Industriales, Sede Dr. Mergelina, University of Valladolid, Dr. Mergelina s/n, 47011 Valladolid, Spain.
| | - I Ramos
- Department of Chemical Engineering and Environmental Technology, Escuela de Ingenierías Industriales, Sede Dr. Mergelina, University of Valladolid, Dr. Mergelina s/n, 47011 Valladolid, Spain.
| | - M Fdz-Polanco
- Department of Chemical Engineering and Environmental Technology, Escuela de Ingenierías Industriales, Sede Dr. Mergelina, University of Valladolid, Dr. Mergelina s/n, 47011 Valladolid, Spain.
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12
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Lim JW, Chiam JA, Wang JY. Microbial community structure reveals how microaeration improves fermentation during anaerobic co-digestion of brown water and food waste. BIORESOURCE TECHNOLOGY 2014; 171:132-8. [PMID: 25194261 DOI: 10.1016/j.biortech.2014.08.050] [Citation(s) in RCA: 105] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2014] [Revised: 08/06/2014] [Accepted: 08/09/2014] [Indexed: 05/21/2023]
Abstract
The purpose of this study was to investigate the impact of microaeration on the fermentation process during anaerobic co-digestion of brown water (BW) and food waste (FW). This was achieved by daily monitoring of reactor performance and the determination of its bacterial consortium towards the end of the study. Molecular cloning and sequencing results revealed that bacteria within phyla Firmicutes and Bacteriodetes represented the dominant phylogenetic group. As compared to anaerobic conditions, the fermentation of BW and FW under microaeration conditions gave rise to a significantly more diverse bacterial population and higher proportion of bacterial clones affiliated to the phylum Firmicutes. The acidogenic reactor was therefore able to metabolize a greater variety of substrates leading to higher hydrolysis rates as compared to the anaerobic reactor. Other than enhanced fermentation, microaeration also led to a shift in fermentation production pattern where acetic acid was metabolized for the synthesis of butyric acid.
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Affiliation(s)
- Jun Wei Lim
- Residues and Resource Reclamation 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.
| | - Jun An Chiam
- Division of Environmental and Water Resources, School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.
| | - Jing-Yuan Wang
- Residues and Resource Reclamation 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.
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