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Mutegoa E, Sahini MG. Approaches to mitigation of hydrogen sulfide during anaerobic digestion process - A review. Heliyon 2023; 9:e19768. [PMID: 37809492 PMCID: PMC10559078 DOI: 10.1016/j.heliyon.2023.e19768] [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: 04/04/2023] [Revised: 08/29/2023] [Accepted: 08/31/2023] [Indexed: 10/10/2023] Open
Abstract
Anaerobic digestion (AD) is the primary technology for energy production from wet biomass under a limited oxygen supply. Various wastes rich in organic content have been renowned for enhancing the process of biogas production. However, several other intermediate unwanted products such as hydrogen sulfide, ammonia, carbon dioxide, siloxanes and halogens have been generated during the process, which tends to lower the quality and quantity of the harvested biogas. The removal of hydrogen sulfide from wastewater, a potential substrate for anaerobic digestion, using various technologies is covered in this study. It is recommended that microaeration would increase the higher removal efficiency of hydrogen sulfide based on a number of benefits for the specific method. The process is primarily accomplished by dosing smaller amounts of oxygen in the digester, which increases the system's oxidizing capacity by rendering the sulfate reducing bacteria responsible for converting sulfate ions to hydrogen sulfide inactive. This paper reviews physicochemical and biological methods that have been in place to eliminate the effects of hydrogen sulfide from wastewater treated anaerobically and future direction to remove hydrogen sulfide from biogas produced.
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Affiliation(s)
- Eric Mutegoa
- Department of Chemistry, College of Natural and Mathematical Sciences (CNMS), The University of Dodoma, P.O. Box 338, Dodoma, Tanzania
| | - Mtabazi G. Sahini
- Department of Chemistry, College of Natural and Mathematical Sciences (CNMS), The University of Dodoma, P.O. Box 338, Dodoma, Tanzania
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Fu S, Lian S, Angelidaki I, Guo R. Micro-aeration: an attractive strategy to facilitate anaerobic digestion. Trends Biotechnol 2022; 41:714-726. [PMID: 36216713 DOI: 10.1016/j.tibtech.2022.09.008] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Revised: 09/13/2022] [Accepted: 09/19/2022] [Indexed: 01/11/2023]
Abstract
Micro-aeration can facilitate anaerobic digestion (AD) by regulating microbial communities and promoting the growth of facultative taxa, thereby increasing methane yield and stabilizing the AD process. Additionally, micro-aeration contributes to hydrogen sulfide stripping by oxidization to produce molecular sulfur or sulfuric acid. Although micro-aeration can positively affect AD, it must be strictly regulated to maintain an overall anaerobic environment that permits anaerobic microorganisms to thrive. Even so, obligate anaerobes, especially methanogens, could suffer from oxidative stress during micro-aeration. This review describes the applications of micro-aeration in AD and examines the cutting-edge advances in how methanogens survive under oxygen stress. Moreover, barriers and corresponding solutions are proposed to move micro-aeration technology closer to application at scale.
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Rabii A, Koupaie EH, Aldin S, Dahman Y, Elbeshbishy E. Methods of pretreatment and their impacts on anaerobic codigestion of multifeedstocks: A review. WATER ENVIRONMENT RESEARCH : A RESEARCH PUBLICATION OF THE WATER ENVIRONMENT FEDERATION 2021; 93:2834-2852. [PMID: 34459508 DOI: 10.1002/wer.1636] [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: 10/01/2020] [Revised: 06/29/2021] [Accepted: 07/07/2021] [Indexed: 06/13/2023]
Abstract
Anaerobic codigestion (AnCoD) has attracted attention owing to its advantages over conventional anaerobic digestion, and attempts are still going on to develop methods for improving the efficiency of this technology. Mostly, addition of cosubstrates without applying a proper pretreatment cannot adequately enhance the performance of the digestion. However, there is a lack of a comprehensive study on different pretreatment methods specific to the wide range of cosubstrates. This review aimed to (i) categorize pretreatment techniques that have been developed for improving AnCoD, (ii) present the results of the studies on the effect of pretreatment on improving AnCoD, and (iii) provide a comparison between pretreatment methods and their application for different types of cosubstrates. The findings primarily validated the influence of pretreatment to enhance the process by increasing biodegradability, improved hydrolysis, reduced hydraulic retention time (HRT), and improved methane production. The five main categories of pretreatment employed in codigestion included the following: mechanical, thermal, chemical, biological, and hybrid pretreatment. Among them, mechanical and biological pretreatment have the most and least application in codigestion, respectively. Greater efforts are required on the application of biological pretreatment and cost-benefit analysis of different pretreatment options on the variety of the cosubstrates. PRACTITIONER POINTS: Pretreatment can significantly enhance biomethane production in anaerobic digestion Anaerobic codigestion along with pretreatment can further enhance the conventional anaerobic digestion of single feedstock Mechanical and biological methods have been the most and least practiced pretreatment options Selection of applicable pretreatment option to enhance methane production is subject to the type of cosubstrates in the system There is a research gap in evaluating the application of biological pretreatment for various types of cosubstrates.
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Affiliation(s)
- Anahita Rabii
- Environmental Research for Resource Recovery (ER3), Department of Civil Engineering, Ryerson University, Toronto, Ontario, Canada
| | - Ehssan Hosseini Koupaie
- Environmental Research for Resource Recovery (ER3), Department of Civil Engineering, Ryerson University, Toronto, Ontario, Canada
| | - Saad Aldin
- Environmental Research for Resource Recovery (ER3), Department of Civil Engineering, Ryerson University, Toronto, Ontario, Canada
| | - Yaser Dahman
- Department of Chemical Engineering, Ryerson University, Toronto, Ontario, Canada
| | - Elsayed Elbeshbishy
- Environmental Research for Resource Recovery (ER3), Department of Civil Engineering, Ryerson University, Toronto, Ontario, Canada
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Zhuang H, Lee PH, Wu Z, Jing H, Guan J, Tang X, Tan GYA, Leu SY. Genomic driven factors enhance biocatalyst-related cellulolysis potential in anaerobic digestion. BIORESOURCE TECHNOLOGY 2021; 333:125148. [PMID: 33878497 DOI: 10.1016/j.biortech.2021.125148] [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: 02/08/2021] [Revised: 04/01/2021] [Accepted: 04/04/2021] [Indexed: 06/12/2023]
Abstract
Anaerobic digestion (AD) is a promising technology to recover bioenergy from biodegradable biomass, including cellulosic wastes. Through a few fractionation/separation techniques, cellulose has demonstrated its potential in AD, but the performance of the process is rather substrate-specific, as cellulolysis bacteria are sensitive to the enzyme-substrate interactions. Cellulosome is a self-assembled enzyme complex with many functionalized modules in the bacteria which has been gradually studied, however the genomic fingerprints of the culture-specific cellulosome in AD are relatively unclear especially under processing conditions. To clarify the key factors affecting the cellulosome induced cellulolysis, this review summarized the most recent publications of AD regarding the fates of cellulose, sources and functional genes of cellulosome, and omics methods for functional analyses. Different processes for organic treatment including applying food grinds in sewer, biomass valorization, cellulose fractionation, microaeration, and enzymatic hydrolysis enhanced fermentation, were highlighted to support the sustainable development of AD technology.
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Affiliation(s)
- Huichuan Zhuang
- Dept. of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong; Department of Civil Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong
| | - Po-Heng Lee
- Dept. of Civil and Environmental Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, UK
| | - Zhuoying Wu
- Dept. of Civil and Environmental Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, UK
| | - Houde Jing
- Dept. of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
| | - Jianyu Guan
- Dept. of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
| | - Xiaojing Tang
- Dept. of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
| | - Giin-Yu Amy Tan
- Department of Civil Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong
| | - Shao-Yuan Leu
- Dept. of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong.
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Choi Y, Ha DM, Lee S, Kim DH. Effect of aerobically treated manure on odorous material emissions from a swine finishing barn equipped with a continuous pit recirculation system. Anim Biosci 2021; 35:308-316. [PMID: 34237917 PMCID: PMC8738943 DOI: 10.5713/ab.21.0135] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Accepted: 05/27/2021] [Indexed: 11/27/2022] Open
Abstract
OBJECTIVE This study was conducted to determine reduction of various odorous materials from a swine farm equipped with a continuous pit recirculation system (CPRS) with aerobically treated liquid manure. METHODS The CPRS is used in swine farms in South Korea, primarily to improve air quality in pig houses. In this study, CPRS consists of a manure aerobic treatment system and a fit recirculation system; the solid fraction is separated and composted, whereas the aerobically treated liquid fraction (290.0%±21.0% per day of total stored swine slurry) is continuously returned to the pit. Four confinement pig barns in three piggery farms were used; two were equipped with CPRS and the other two operated a slurry pit under the slatted floor. RESULTS All chemical contents of slurry pit manure in the control were greater than those of slurry pit manure in the CRPS treatment (p<0.05). Electrical conductivity and pH contents did not differ among treatments. The biological oxygen demand of the slurry pit treatment was greater than that of the other treatments (p<0.05). Total nitrogen, total phosphorus, and ammonia nitrogen contents of the slurry pit treatment were greater than those of other treatments (p<0.05). Odor intensity of the CPRS treatment was lower than that of the control at indoor, exhaust, and outside sampling points (p<0.05). The temperature and carbon dioxide of the CPRS treatment in the pig barn was significantly lower than those of control (p<0.05). All measured odorous material contents of the CPRS group were significantly lower than those of the control group (p<0.05). CONCLUSION The CPRS application in pig farms is considered a good option as it continuously reduces the organic load of animal manure and lowers the average odorant concentration below the threshold of detecting odorous materials.
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Affiliation(s)
- Yongjun Choi
- Department of Animal Science and Technology, Konkuk University, Seoul 05029, Korea
| | - Duck-Min Ha
- Department of Animal Resources Technology, Gyeongnam National University of Science and Technology, Jinju 52725, Korea
| | - Sangrak Lee
- Department of Animal Science and Technology, Konkuk University, Seoul 05029, Korea
| | - Doo-Hwan Kim
- Department of Animal Resources Technology, Gyeongnam National University of Science and Technology, Jinju 52725, Korea
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Wu Z, Nguyen D, Lam TYC, Zhuang H, Shrestha S, Raskin L, Khanal SK, Lee PH. Synergistic association between cytochrome bd-encoded Proteiniphilum and reactive oxygen species (ROS)-scavenging methanogens in microaerobic-anaerobic digestion of lignocellulosic biomass. WATER RESEARCH 2021; 190:116721. [PMID: 33326896 DOI: 10.1016/j.watres.2020.116721] [Citation(s) in RCA: 62] [Impact Index Per Article: 20.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2020] [Revised: 11/30/2020] [Accepted: 12/01/2020] [Indexed: 06/12/2023]
Abstract
Intermittent (every other day) microaerobic [picomolar oxygen by oxidation-reduction potential (ORP) set at +25 mV above anaerobic baseline] digestion of lignocellulosic biomass showed higher digestibility and better stability at a high organic loading rate (OLR) of 5 g volatile solids (VS)/L/d than that under strict anaerobic conditions. However, the microbial mechanisms supporting the delicate balance under microaeration remain underexplored. On the basis of our previous findings that microbial communities in replicate experiments were dominated by strains of the genus Proteiniphilum but contained diverse taxa of methanogenic archaea, here we recovered related genomes and reconstructed the putative metabolic pathways using a genome-centric metagenomic approach. The highly enriched Proteiniphilum strains were identified as efficient cellulolytic facultative bacterium, which directly degraded lignocellulose to carbon dioxide, formate, and acetate via aerobic respiration and anaerobic fermentation, alternatively. Moreover, high oxygen affinity cytochromes, bd-type terminal oxidases, in Proteiniphilum strains were found to be closely associated with such picomolar oxygen conditions, which has long been overlooked in anaerobic digestion. Furthermore, hydrogenotrophic methanogenesis was the prevalent pathway for methane production while Methanosarcina, Methanobrevibacter, and Methanocorpusculum were the dominant methanogens in the replicate experiments. Importantly, the two functional groups, namely cellulolytic facultative Proteiniphilum strains and methanogens, encoded various antioxidant enzymes. Energy-dependent reactive oxygen species (ROS) scavengers (superoxide reductase (SOR) and rubrerythrin (rbr) were ubiquitously present in different methanogenic taxa in response to replicate-specific ORP levels (-470, -450 and -475 mV). Collectively, cytochrome bd oxidase and ROS defenders may play roles in improving the digestibility and stability observed in intermittent microaerobic digestion.
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Affiliation(s)
- Zhuoying Wu
- Department of Civil and Environmental Engineering, Imperial College, London, The United Kingdom
| | - Duc Nguyen
- Department of Molecular Biosciences and Bioengineering, University of Hawai'i at Mānoa, Honolulu, HI 96822, USA
| | - Theo Y C Lam
- Department of Civil and Environmental Engineering, Imperial College, London, The United Kingdom; Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR
| | - Huichuan Zhuang
- Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR
| | - Shilva Shrestha
- Department of Civil and Environmental Engineering, University of Michigan, 1351 Beal Avenue, 107 EWRE Building, Ann Arbor, MI 48109-2125, USA
| | - Lutgarde Raskin
- Department of Civil and Environmental Engineering, University of Michigan, 1351 Beal Avenue, 107 EWRE Building, Ann Arbor, MI 48109-2125, USA
| | - Samir Kumar Khanal
- Department of Molecular Biosciences and Bioengineering, University of Hawai'i at Mānoa, Honolulu, HI 96822, USA.
| | - Po-Heng Lee
- Department of Civil and Environmental Engineering, Imperial College, London, The United Kingdom.
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Fan F, Xu R, Wang D, Meng F. Application of activated sludge for odor control in wastewater treatment plants: Approaches, advances and outlooks. WATER RESEARCH 2020; 181:115915. [PMID: 32485441 DOI: 10.1016/j.watres.2020.115915] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2020] [Revised: 04/14/2020] [Accepted: 05/02/2020] [Indexed: 06/11/2023]
Abstract
Odors from wastewater treatment plants (WWTPs) have attracted extensive attention and stringent environmental standards are more widely adopted to reduce odor emissions. Biological odor treatment methods have broader applications than the physical and chemical counterparts as they are environment-friendly, cost-effective and generate low secondary wastes. The aqueous activated sludge (AS) processes are among the most promising approaches for the prevention or end-of-pipe removal of odor emissions and have the potential to simultaneously treat odor and wastewater. However, AS deodorization biotechnologies in WWTPs still need to be further systematically summarized and categorized while in-depth discussions on the characteristics and underlying mechanisms of AS deodorization process are still lacking. Recently, considerable studies have been reported to elucidate the microbial metabolisms in odor control and wastewater treatment. This paper reviews the fundamentals, characteristics, advances and field experiences of three AS biotechnologies for odor treatment in WWTPs, i.e., AS recycling, microaeration in AS digester and AS diffusion. The underlying deodorization mechanisms of typical odors have been revealed through the summary of recent advances on multi-element conversions, metabolic interactions of bacteria, microscopic characterization and identification of functional microorganisms. Future research aspects to advance the emerging deodorization AS process, such as deodorization mechanisms, simultaneous odor and water treatment, synergistic treatment with other air emissions, are discussed.
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Affiliation(s)
- Fuqiang Fan
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, 510275, PR China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou, 510275, PR China
| | - Ronghua Xu
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, 510275, PR China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou, 510275, PR China
| | - Depeng Wang
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, 510275, PR China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou, 510275, PR China
| | - Fangang Meng
- School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, 510275, PR China; Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou, 510275, PR China.
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8
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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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9
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Chen Q, Wu W, Qi D, Ding Y, Zhao Z. Review on microaeration-based anaerobic digestion: State of the art, challenges, and prospectives. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 710:136388. [PMID: 31923694 DOI: 10.1016/j.scitotenv.2019.136388] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2019] [Revised: 12/26/2019] [Accepted: 12/26/2019] [Indexed: 06/10/2023]
Abstract
Microaeration (dosing small quantities of air or oxygen) is an effective approach to facilitate anaerobic digestion (AD) process and has gained increased attention in recent years. The underlying mechanisms of the facilitation effect of microaeration on AD process were reviewed in terms of accelerating hydrolysis, scavenging hydrogen sulfide, and affecting microbial diversity. Process parameters and control strategies were summarized to reveal considerable factors in implementing microaeration-based AD process. In addition, current applications, including lab-, pilot- and full-scale level cases, were summarized to provide guidance for further improvement in large-scale applications. The challenges and future perspectives were also highlighted to promote the development of AD process associated with microaeration.
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Affiliation(s)
- Qing Chen
- Marine Engineering College, Dalian Maritime University, Dalian 116026, PR China
| | - Wanqing Wu
- Marine Engineering College, Dalian Maritime University, Dalian 116026, PR China.
| | - Dacheng Qi
- Marine Engineering College, Dalian Maritime University, Dalian 116026, PR China
| | - Yihong Ding
- Marine Engineering College, Dalian Maritime University, Dalian 116026, PR China
| | - Zihao Zhao
- Marine Engineering College, Dalian Maritime University, Dalian 116026, PR China
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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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Desulphurisation of Biogas: A Systematic Qualitative and Economic-Based Quantitative Review of Alternative Strategies. CHEMENGINEERING 2019. [DOI: 10.3390/chemengineering3030076] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The desulphurisation of biogas for hydrogen sulphide (H2S) removal constitutes a significant challenge in the area of biogas research. This is because the retention of H2S in biogas presents negative consequences on human health and equipment durability. The negative impacts are reflective of the potentially fatal and corrosive consequences reported when biogas containing H2S is inhaled and employed as a boiler biofuel, respectively. Recognising the importance of producing H2S-free biogas, this paper explores the current state of research in the area of desulphurisation of biogas. In the present paper, physical–chemical, biological, in-situ, and post-biogas desulphurisation strategies were extensively reviewed as the basis for providing a qualitative comparison of the strategies. Additionally, a review of the costing data combined with an analysis of the inherent data uncertainties due underlying estimation assumptions have also been undertaken to provide a basis for quantitative comparison of the desulphurisation strategies. It is anticipated that the combination of the qualitative and quantitative comparison approaches employed in assessing the desulphurisation strategies reviewed in the present paper will aid in future decisions involving the selection of the preferred biogas desulphurisation strategy to satisfy specific economic and performance-related targets.
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Camiloti PR, Valdés F, Delforno TP, Bartacek J, Zaiat M, Jeison D. A membrane aerated biofilm reactor for sulfide control from anaerobically treated wastewater. ENVIRONMENTAL TECHNOLOGY 2019; 40:2354-2363. [PMID: 29448898 DOI: 10.1080/09593330.2018.1441329] [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: 09/22/2017] [Accepted: 02/10/2018] [Indexed: 06/08/2023]
Abstract
A upflow anaerobic sludge blanket reactor was operated combined to a membrane aerated biofilm reactor for sulfate removal and for elemental sulfur reclamation. A commercial silicon tube was used as an oxygen delivery diffuser. The process achieved high rates of sulfide removal from the liquid phase (90%). The hydrogen sulfide removal was influenced by the pH value and at pH value of 7.5, 98% of the H2S was removed. The elemental sulfur was observed inside the membrane, with content in the biomass of 21%. Through the massive sequencing of the samples, the microbial community diversity and the stratification of biomass inside the silicon tube was demonstrated, confirming the presence of sulfide-oxidizing bacteria on the membrane wall. The most important genera found related to the sulfur cycle were Sulfuricurvum, Geovibrio, Flexispira and Sulforospirillum.
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Affiliation(s)
- Priscila Rosseto Camiloti
- a Biological Processes Laboratory, Center for Research, Development and Innovation in Environmental Engineering, São Carlos School of Engineering (EESC), University of São Paulo (USP) , São Carlos , SP , Brazil
| | - Freddy Valdés
- b Natural Resources Department, Universidad de La Frontera , Temuco , Chile
| | - Tiago Palladino Delforno
- c Microbial Resources Division, Research Center for Chemistry, Biology and Agriculture (CPQBA), Campinas University - UNICAMP , Campinas , SP , Brazil
| | - Jan Bartacek
- d Department of Water Technology and Environmental Engineering, Institute of Chemical Technology , Praga , Czech Republic
| | - Marcelo Zaiat
- a Biological Processes Laboratory, Center for Research, Development and Innovation in Environmental Engineering, São Carlos School of Engineering (EESC), University of São Paulo (USP) , São Carlos , SP , Brazil
| | - David Jeison
- e Escuela de Ingeniería Bioquímica, Pontificia Universidad Católica de Valparaíso , Valparaíso , Chile
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Donoso-Bravo A, Constanza Sadino-Riquelme M, Díaz I, Muñoz R. Mathematical modelling of in-situ microaerobic desulfurization of biogas from sewage sludge digestion. BIOTECHNOLOGY REPORTS 2018; 20:e00293. [PMID: 30568887 PMCID: PMC6288047 DOI: 10.1016/j.btre.2018.e00293] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/27/2018] [Revised: 10/31/2018] [Accepted: 11/16/2018] [Indexed: 11/21/2022]
Abstract
An extension of the ADM1 model for the microaeration process is proposed. The model was tested with data from pilot scale digester operated for 200 d. Results indicate that the model can be used to predict the digester behavior. The addition of a retention parameter for the SOB improved the model performance.
Microaeration can be used to cost-effectively remove in-situ H2S from the biogas generated in anaerobic digesters. This study is aimed at developing and validating an extension of the Anaerobic Digestion Model n°1 capable of incorporating the main phenomena which occurs during microaeration. This innovative model was implemented and tested with data from a pilot scale digester microaerated for ∼ 200 d. The results showed that despite the model’s initial ability to predict the digester’s behavior, its predicted performance was improved by calibrating the most influential parameters. The model’s prediction potential was largely enhanced by adding retention parameters that account for the activity of sulfide oxidizing bacteria retained inside the anaerobic digester, which have been consistently shown to be responsible for a large share of the H2S removed.
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Nguyen D, Khanal SK. A little breath of fresh air into an anaerobic system: How microaeration facilitates anaerobic digestion process. Biotechnol Adv 2018; 36:1971-1983. [DOI: 10.1016/j.biotechadv.2018.08.007] [Citation(s) in RCA: 69] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2018] [Revised: 08/07/2018] [Accepted: 08/20/2018] [Indexed: 10/28/2022]
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Dai X, Hu C, Zhang D, Chen Y. A new method for the simultaneous enhancement of methane yield and reduction of hydrogen sulfide production in the anaerobic digestion of waste activated sludge. BIORESOURCE TECHNOLOGY 2017; 243:914-921. [PMID: 28738546 DOI: 10.1016/j.biortech.2017.07.036] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2017] [Revised: 07/03/2017] [Accepted: 07/06/2017] [Indexed: 06/07/2023]
Abstract
The biogas generated from anaerobic digestion (AD) also includes undesirable by-product such as hydrogen sulfide (H2S), which must be removed before the biogas can be used as a clean energy source. Therefore, it is necessary to find an appropriate strategy to simultaneously enhance the methane yield and reduce H2S production. An efficient strategy-pretreating sludge at pH 10 for 8d and adjusting the system at neutral pH to produce methane for 20d-is reported for the synchronous enhancement of methane production and reduction of H2S production during AD. The experimental results showed that the cumulative methane yield was 861.2±6.1mL/g volatile solids (VS) of sludge pretreated at pH 10 in semi-continuous stirred anaerobic reactors for 84d, an increase of 49.6% over the yield in the control. Meanwhile, the cumulative production of H2S was 144.1×10-4mL/g VS, 54.2% lower than that in the control.
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Affiliation(s)
- Xiaohu Dai
- State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China
| | - Chongliang Hu
- State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China
| | - Dong Zhang
- State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China.
| | - Yinguang Chen
- State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China
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16
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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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17
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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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18
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Li X, Jiang X, Zhou Q, Jiang W. Effect of S/N Ratio on the Removal of Hydrogen Sulfide from Biogas in Anoxic Bioreactors. Appl Biochem Biotechnol 2016; 180:930-944. [DOI: 10.1007/s12010-016-2143-3] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2016] [Accepted: 05/13/2016] [Indexed: 11/24/2022]
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Valdés F, Camiloti PR, Rodriguez RP, Delforno TP, Carrillo-Reyes J, Zaiat M, Jeison D. Sulfide-oxidizing bacteria establishment in an innovative microaerobic reactor with an internal silicone membrane for sulfur recovery from wastewater. Biodegradation 2016; 27:119-30. [PMID: 27003697 DOI: 10.1007/s10532-016-9760-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2015] [Accepted: 03/15/2016] [Indexed: 11/24/2022]
Abstract
A novel bioreactor, employing a silicone membrane for microaeration, was studied for partial sulfide oxidation to elemental sulfur. The objective of this study was to assess the feasibility of using an internal silicone membrane reactor (ISMR) to treat dissolved sulfide and to characterize its microbial community. The ISMR is an effective system to eliminate sulfide produced in anaerobic reactors. Sulfide removal efficiencies reached 96 % in a combined anaerobic/microaerobic reactor and significant sulfate production did not occur. The oxygen transfer was strongly influenced by air pressure and flow. Pyrosequencing analysis indicated various sulfide-oxidizing bacteria (SOB) affiliated to the species Acidithiobacillus thiooxidans, Sulfuricurvum kujiense and Pseudomonas stutzeri attached to the membrane and also indicated similarity between the biomass deposited on the membrane wall and the biomass drawn from the material support, supported the establishment of SOB in an anaerobic sludge under microaerobic conditions. Furthermore, these results showed that the reactor configuration can develop SOB under microaerobic conditions and can improve and reestablish the sulfide conversion to elemental sulfur.
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Affiliation(s)
- F Valdés
- Department of Chemical Engineering, Universidad de La Frontera, Avenida Francisco Salazar, 01145, Temuco, Chile
| | - P R Camiloti
- Biological Processes Laboratory, São Carlos School of Engineering (EESC), Center for Research, Development and Innovation in Environmental Engineering, Universidade de São Paulo (USP), Engenharia Ambiental - Bloco 4-F, Avenida João Dagnone, 1100 - Santa Angelina, 13.563-120, São Carlos, SP, Brazil.
| | - R P Rodriguez
- Science and Technology Institute, Universidade Federal de Alfenas, Rodovia José Aurélio Vilela, 11999, Poços de Caldas, MG, Brazil
| | - T P Delforno
- Biological Processes Laboratory, São Carlos School of Engineering (EESC), Center for Research, Development and Innovation in Environmental Engineering, Universidade de São Paulo (USP), Engenharia Ambiental - Bloco 4-F, Avenida João Dagnone, 1100 - Santa Angelina, 13.563-120, São Carlos, SP, Brazil
| | - J Carrillo-Reyes
- Instituto Potosino de Investigación Científica y Tecnológica, Camino a la Presa San José, 2055, San Luis Potosí, Mexico
| | - M Zaiat
- Biological Processes Laboratory, São Carlos School of Engineering (EESC), Center for Research, Development and Innovation in Environmental Engineering, Universidade de São Paulo (USP), Engenharia Ambiental - Bloco 4-F, Avenida João Dagnone, 1100 - Santa Angelina, 13.563-120, São Carlos, SP, Brazil
| | - D Jeison
- Department of Chemical Engineering, Universidad de La Frontera, Avenida Francisco Salazar, 01145, Temuco, Chile
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Pokorna D, Zabranska J. Sulfur-oxidizing bacteria in environmental technology. Biotechnol Adv 2015; 33:1246-59. [DOI: 10.1016/j.biotechadv.2015.02.007] [Citation(s) in RCA: 235] [Impact Index Per Article: 26.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2014] [Revised: 02/02/2015] [Accepted: 02/12/2015] [Indexed: 11/16/2022]
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21
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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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Nghiem LD, Manassa P, Dawson M, Fitzgerald SK. Oxidation reduction potential as a parameter to regulate micro-oxygen injection into anaerobic digester for reducing hydrogen sulphide concentration in biogas. BIORESOURCE TECHNOLOGY 2014; 173:443-447. [PMID: 25306445 DOI: 10.1016/j.biortech.2014.09.052] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2014] [Revised: 09/10/2014] [Accepted: 09/11/2014] [Indexed: 06/04/2023]
Abstract
This study aims to evaluate the use of oxidation reduction potential (ORP) to regulate the injection of a small amount of oxygen into an anaerobic digester for reducing H2S concentration in biogas. The results confirm that micro-oxygen injection can be effective for controlling H2S formation during anaerobic digestion without disturbing the performance of the digester. Biogas production, composition, and the removal of volatile solids (VS) and chemical oxygen demand (COD) were monitored to assessment the digester's performance. Six days after the start of the micro-oxygen injection, the ORP values increased to between -320 and -270 mV, from the natural baseline value of -485 mV. Over the same period the H2S concentration in the biogas decreased from over 6000 ppm to just 30 ppm. No discernible changes in the VS and COD removal rates, pH and alkalinity of the digestate or in the biogas production or composition were observed.
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Affiliation(s)
- Long D Nghiem
- Strategic Water Infrastructure Laboratory, School of Civil Mining and Environmental Engineering, University of Wollongong, Wollongong, NSW 2522, Australia.
| | - Patrick Manassa
- Strategic Water Infrastructure Laboratory, School of Civil Mining and Environmental Engineering, University of Wollongong, Wollongong, NSW 2522, Australia
| | - Marcia Dawson
- Sydney Water Corporation, Parramatta, NSW 2124, Australia
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Ramos I, Peña M, Fdz-Polanco M. Where does the removal of H₂S from biogas occur in microaerobic reactors? BIORESOURCE TECHNOLOGY 2014; 166:151-157. [PMID: 24907574 DOI: 10.1016/j.biortech.2014.05.058] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2014] [Revised: 05/10/2014] [Accepted: 05/17/2014] [Indexed: 06/03/2023]
Abstract
In order to maximise the efficiency of biogas desulphurisation and reduce the oxygen cost during microaerobic digestion, it is essential to know how the process occurs. For this purpose, a reactor with a total volume of 266 L, treating 10 L/d of sewage sludge, was operated with 25.0 L and without headspace. Under anaerobic conditions, the H2S concentration in the biogas varied between 0.21 and 0.38%v/v. Next, O2 was supplied from the bottom of the reactor. At 0.25-0.30 NLO₂/Lfed, the biogas was entirely desulphurised, and its O₂ content remained below 1.03%v/v, when the digester had 25.0 L of gas space. However, with almost no headspace, the H2S content in the biogas fluctuated from 0.08 to 0.21%v/v, while the average O2 concentration was 1.66%v/v. The removed H2S accumulated in the outlet pipe of the biogas in the form of S(0) due to the insufficient headspace.
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Affiliation(s)
- 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 Peña
- 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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24
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Ramos I, Pérez R, Reinoso M, Torio R, Fdz-Polanco M. Microaerobic digestion of sewage sludge on an industrial-pilot scale: the efficiency of biogas desulphurisation under different configurations and the impact of O2 on the microbial communities. BIORESOURCE TECHNOLOGY 2014; 164:338-346. [PMID: 24874874 DOI: 10.1016/j.biortech.2014.04.109] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2014] [Revised: 04/28/2014] [Accepted: 04/29/2014] [Indexed: 06/03/2023]
Abstract
Biogas produced in an industrial-pilot scale sewage sludge reactor (5m(3)) was desulphurised by imposing microaerobic conditions. The H2S concentration removal efficiency was evaluated under various configurations: different mixing methods and O2 injection points. Biogas was entirely desulphurised under all the configurations set, while the O2 demand of the digester decreased over time. Although the H2S removal seemed to occur in the headspace, S(0) (which was found to be the main oxidation product) was scarcely deposited there in the headspace. O2 did not have a significant impact on the digestion performance; the VS removal remained around 47%. Conversely, DGGE revealed that the higher O2 transfer rate to the sludge maintained by biogas recirculation increased the microbial richness and evenness, and caused an important shift in the structure of the bacterial and the archaeal communities in the long term. All the archaeal genera identified (Methanosaeta, Methanospirillum and Methanoculleus) were present under both anaerobic and microaerobic conditions.
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Affiliation(s)
- 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.
| | - R Pérez
- 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 Reinoso
- Socamex S.A.U (Grupo Urbaser), Polígono Industrial San Cristóbal, C/Cobalto 12, 47012 Valladolid, Spain.
| | - R Torio
- Socamex S.A.U (Grupo Urbaser), Polígono Industrial San Cristóbal, C/Cobalto 12, 47012 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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25
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Lim JW, Wang JY. Enhanced hydrolysis and methane yield by applying microaeration pretreatment to the anaerobic co-digestion of brown water and food waste. WASTE MANAGEMENT (NEW YORK, N.Y.) 2013; 33:813-819. [PMID: 23290270 DOI: 10.1016/j.wasman.2012.11.013] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2012] [Revised: 11/19/2012] [Accepted: 11/22/2012] [Indexed: 06/01/2023]
Abstract
Microaeration has been used conventionally for the desulphurization of biogas, and recently it was shown to be an alternative pretreatment to enhance hydrolysis of the anaerobic digestion (AD) process. Previous studies on microaeration pretreatment were limited to the study of substrates with complex organic matter, while little has been reported on its effect on substrates with higher biodegradability such as brown water and food waste. Due to the lack of consistent microaeration intensities, previous studies were not comparable and thus inconclusive in proving the effectiveness of microaeration to the overall AD process. In this study, the role of microaeration pretreatment in the anaerobic co-digestion of brown water and food waste was evaluated in batch-tests. After a 4-day pretreatment with 37.5 mL-O2/L(R)-d added to the liquid phase of the reactor, the methane production of substrates were monitored in anaerobic conditions over the next 40 days. The added oxygen was consumed fully by facultative microorganisms and a reducing environment for organic matter degradation was maintained. Other than higher COD solubilization, microaeration pretreatment led to greater VFA accumulation and the conversion of other short chain fatty acids to acetate. This could be due to enhanced activities of hydrolytic and acidogenic bacteria and the degradation of slowly biodegradable compounds under microaerobic conditions. This study also found that the nature of inoculum influenced the effects of microaeration as a 21% and 10% increase in methane yield was observed when pretreatment was applied to inoculated substrates, and substrates without inoculum, respectively.
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Affiliation(s)
- Jun Wei Lim
- Residues and Resource Reclamation Centre, Nanyang Environment & Water Research Institute, Nanyang Technological University, Singapore 637141, Singapore
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Díaz I, Donoso-Bravo A, Fdz-Polanco M. Effect of microaerobic conditions on the degradation kinetics of cellulose. BIORESOURCE TECHNOLOGY 2011; 102:10139-10142. [PMID: 21906933 DOI: 10.1016/j.biortech.2011.07.096] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2011] [Revised: 07/23/2011] [Accepted: 07/26/2011] [Indexed: 05/31/2023]
Abstract
Limited oxygen supply to sludge digesters has shown to be an effective method to eliminate hydrogen sulfide from the biogas produced during anaerobic digestion but uneven results have been found in terms of the effect on the degradation of complex organic matter. In this study, the effect that the limited oxygen supply provoked on the "anaerobic" degradation of cellulose was evaluated in batch-tests. The microaerobic assays showed to reach a similar maximum production of methane than the anaerobic ones after 19 d and a similar hydrolytic activity (considering a first order rate constant); however, the microaerobic assays presented a shorter lag-phase time than the anaerobic test resulting in faster production of methane during the first steps of the degradation; specifically, the maximum methane production found in the anaerobic test in 19 d was found in the microaerobic test before the day 15.
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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
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28
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Díaz I, Pérez SI, Ferrero EM, Fdz-Polanco M. Effect of oxygen dosing point and mixing on the microaerobic removal of hydrogen sulphide in sludge digesters. BIORESOURCE TECHNOLOGY 2011; 102:3768-3775. [PMID: 21193305 DOI: 10.1016/j.biortech.2010.12.016] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2010] [Revised: 11/30/2010] [Accepted: 12/01/2010] [Indexed: 05/30/2023]
Abstract
Limited oxygen supply to anaerobic sludge digesters to remove hydrogen sulphide from biogas was studied. Micro-oxygenation showed competitive performance to reduce considerably the additional equipment necessary to perform biogas desulphurization. Two pilot-plant digesters with an HRT of ∼ 20 d were micro-oxygenated at a rate of 0.25 NL per L of feed sludge with a removal efficiency higher than 98%. The way of mixing (sludge or biogas recirculation) and the point of oxygen supply (headspace or liquid phase) played an important role on hydrogen sulphide oxidation. While micro-oxygenation with sludge recirculation removed only hydrogen sulphide from the biogas, dissolved sulphide was removed if micro-oxygenation was performed with biogas recirculation. Dosage in the headspace resulted in a more stable operation. The result of the hydrogen sulphide oxidation was mostly elemental sulphur, partially accumulated in the headspace of the digester, where different sulphide-oxidising bacteria were found.
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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
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Díaz I, Lopes AC, Pérez SI, Fdz-Polanco M. Performance evaluation of oxygen, air and nitrate for the microaerobic removal of hydrogen sulphide in biogas from sludge digestion. BIORESOURCE TECHNOLOGY 2010; 101:7724-7730. [PMID: 20605444 DOI: 10.1016/j.biortech.2010.04.062] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2010] [Revised: 04/21/2010] [Accepted: 04/25/2010] [Indexed: 05/29/2023]
Abstract
The removal performance of hydrogen sulphide in severely polluted biogas produced during the anaerobic digestion of sludge was studied by employing pure oxygen, air and nitrate as oxidant reactives supplied to the biodigester. Research was performed in a 200-L digester with an hydraulic retention time (HRT) of ∼20 days under mesophilic conditions. The oxygen supply (0.25 N m³/m³ feed) to the bioreactor successfully reduced the hydrogen sulphide content from 15,811 mg/N m³ to less than 400 mg/N m³. The introduction of air (1.27 N m³/m³ feed) removed more than 99% of the hydrogen sulphide content, with a final concentration of ∼55 mg/N m³. COD removal, VS reduction and methane yield were not affected under microaerobic conditions; however, methane concentration in the biogas decreased when air was employed as a result of nitrogen dilution. The nitrate addition was not effective for hydrogen sulphide removal in the biogas.
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Affiliation(s)
- I Díaz
- Department of Chemical Engineering and Environmental Technology, Faculty of Science, University of Valladolid, Prado de la Magdalena s/n 47011, Valladolid, Spain
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