1
|
Zhu X, Yellezuome D, Wang Z, Liu X, Liu R. Comprehensive insights into the effects of acidogenic off-gas utilization on successive biogas production, microbial community structure and metabolite distribution during two-stage anaerobic digestion. WATER RESEARCH 2024; 258:121740. [PMID: 38749185 DOI: 10.1016/j.watres.2024.121740] [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: 10/09/2023] [Revised: 12/26/2023] [Accepted: 05/04/2024] [Indexed: 06/16/2024]
Abstract
Although two-stage anaerobic digestion (TSAD) technology has been investigated, the mechanisms regarding the impact of acidogenic off-gas (AOG) on successive methane production have not been well addressed. In this study, a novel TSAD system was designed. Food waste, as the main substrate, was co-digested with chicken manure and corn straw. The acidogenic gas beyond atmospheric pressure was introduced into the bottom of the methanogenesis reactor through a stainless steel diffuser. Results showed the addition of AOG increased the methane yield from 435.2 to 597.1 mL/g VSin in successive methanogenesis stage, improved by 37.2 %, and increased the energy yield from 9.0 to 11.3 kJ/g VSsubstrate. However, the theoretical contribution of hydrogenotrophic methanogenesis using H2 contained in AOG was only 15.2 % of the increased methane yield. After the addition of AOG, the decreased levels of ammonia nitrogen and butyrate indicate that the stability of the AD system was improved. The electron transfer system and co-enzyme F420 activity were enhanced; however, the decrease in acetate kinase activity indicates aceticlastic methanogenesis may have been weakened. The microbial diversity and species richness were improved by the added AOG. Methanosarcina was more competitive than Methanothermobacter, enhancing the syntrophic effect. The relative abundance of protein degradation bacteria norank_f_Anaerolineaceae and lipid degradation bacteria Syntrophomonas was increased. Metabolite analysis confirmed that the addition of AOG promoted amino acid metabolism, the biosynthesis of other secondary metabolism and lipid metabolism. The improved degradation of recalcitrant organic components (lipids and proteins) in food waste was responsible for the increased methane yield. This study provides an in-depth understanding of the impact of AOG utilization on successive methane production and has practical implications for the treatment of food waste.
Collapse
Affiliation(s)
- Xianpu Zhu
- Biomass Energy Engineering Research Centre, School of Agriculture and Biology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, PR China; Shanghai Yangtze River Delta Eco-environmental Change and Management Observation and Research Station, Ministry of Science and Technology, 800 Dongchuan Road, Shanghai 200240, PR China
| | - Dominic Yellezuome
- Biomass Energy Engineering Research Centre, School of Agriculture and Biology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, PR China; Shanghai Yangtze River Delta Eco-environmental Change and Management Observation and Research Station, Ministry of Science and Technology, 800 Dongchuan Road, Shanghai 200240, PR China
| | - Zengzhen Wang
- Biomass Energy Engineering Research Centre, School of Agriculture and Biology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, PR China; Shanghai Yangtze River Delta Eco-environmental Change and Management Observation and Research Station, Ministry of Science and Technology, 800 Dongchuan Road, Shanghai 200240, PR China; China Three Gorges Investment Management Co., Ltd., Shanghai 200120, PR China
| | - Xuwei Liu
- Biomass Energy Engineering Research Centre, School of Agriculture and Biology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, PR China; Shanghai Yangtze River Delta Eco-environmental Change and Management Observation and Research Station, Ministry of Science and Technology, 800 Dongchuan Road, Shanghai 200240, PR China
| | - Ronghou Liu
- Biomass Energy Engineering Research Centre, School of Agriculture and Biology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, PR China; Shanghai Yangtze River Delta Eco-environmental Change and Management Observation and Research Station, Ministry of Science and Technology, 800 Dongchuan Road, Shanghai 200240, PR China.
| |
Collapse
|
2
|
Robles A, Sundar SV, Mohana Rangan S, Delgado AG. Butanol as a major product during ethanol and acetate chain elongation. Front Bioeng Biotechnol 2023; 11:1181983. [PMID: 37274171 PMCID: PMC10233103 DOI: 10.3389/fbioe.2023.1181983] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2023] [Accepted: 05/08/2023] [Indexed: 06/06/2023] Open
Abstract
Chain elongation is a relevant bioprocess in support of a circular economy as it can use a variety of organic feedstocks for production of valuable short and medium chain carboxylates, such as butyrate (C4), caproate (C6), and caprylate (C8). Alcohols, including the biofuel, butanol (C4), can also be generated in chain elongation but the bioreactor conditions that favor butanol production are mainly unknown. In this study we investigated production of butanol (and its precursor butyrate) during ethanol and acetate chain elongation. We used semi-batch bioreactors (0.16 L serum bottles) fed with a range of ethanol concentrations (100-800 mM C), a constant concentration of acetate (50 mM C), and an initial total gas pressure of ∼112 kPa. We showed that the butanol concentration was positively correlated with the ethanol concentration provided (up to 400 mM C ethanol) and to chain elongation activity, which produced H2 and further increased the total gas pressure. In bioreactors fed with 400 mM C ethanol and 50 mM C acetate, a concentration of 114.96 ± 9.26 mM C butanol (∼2.13 g L-1) was achieved after five semi-batch cycles at a total pressure of ∼170 kPa and H2 partial pressure of ∼67 kPa. Bioreactors with 400 mM C ethanol and 50 mM C acetate also yielded a butanol to butyrate molar ratio of 1:1. At the beginning of cycle 8, the total gas pressure was intentionally decreased to ∼112 kPa to test the dependency of butanol production on total pressure and H2 partial pressure. The reduction in total pressure decreased the molar ratio of butanol to butyrate to 1:2 and jolted H2 production out of an apparent stall. Clostridium kluyveri (previously shown to produce butyrate and butanol) and Alistipes (previously linked with butyrate production) were abundant amplicon sequence variants in the bioreactors during the experimental phases, suggesting the microbiome was resilient against changes in bioreactor conditions. The results from this study clearly demonstrate the potential of ethanol and acetate-based chain elongation to yield butanol as a major product. This study also supports the dependency of butanol production on limiting acetate and on high total gas and H2 partial pressures.
Collapse
Affiliation(s)
- Aide Robles
- Biodesign Swette Center for Environmental Biotechnology, Arizona State University, Tempe, AZ, United States
- School of Sustainable Engineering and the Built Environment, Arizona State University, Tempe, AZ, United States
- Engineering Research Center for Bio-Mediated and Bio-Inspired Geotechnics, Arizona State University, Tempe, AZ, United States
| | - Skanda Vishnu Sundar
- Biodesign Swette Center for Environmental Biotechnology, Arizona State University, Tempe, AZ, United States
- School of Sustainable Engineering and the Built Environment, Arizona State University, Tempe, AZ, United States
| | - Srivatsan Mohana Rangan
- Biodesign Swette Center for Environmental Biotechnology, Arizona State University, Tempe, AZ, United States
- School of Sustainable Engineering and the Built Environment, Arizona State University, Tempe, AZ, United States
- Engineering Research Center for Bio-Mediated and Bio-Inspired Geotechnics, Arizona State University, Tempe, AZ, United States
| | - Anca G. Delgado
- Biodesign Swette Center for Environmental Biotechnology, Arizona State University, Tempe, AZ, United States
- School of Sustainable Engineering and the Built Environment, Arizona State University, Tempe, AZ, United States
- Engineering Research Center for Bio-Mediated and Bio-Inspired Geotechnics, Arizona State University, Tempe, AZ, United States
| |
Collapse
|
3
|
Li Y, He C, Dong F, Yuan S, Hu Z, Wang W. Performance of anaerobic digestion of phenol using exogenous hydrogen and granular activated carbon and analysis of microbial community. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:45077-45087. [PMID: 36701053 DOI: 10.1007/s11356-023-25275-3] [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: 09/15/2022] [Accepted: 01/08/2023] [Indexed: 06/17/2023]
Abstract
Anaerobic conversion rate of phenol to methane was low due to its biological toxicity. In this study, the coupling of granular activated carbon (GAC) and exogenous hydrogen (EH) could enhance greatly methane production of phenol anaerobic digestion, and the metagenomic was firstly used to analyze its potential mechanism. The results indicated that a mass of syntrophic acetate-oxidizing bacteria and hydrogen-utilizing methanogens were enriched on the GAC surface, and SAO-HM pathway has become the dominant pathway. The energy transfer analysis implied that the abundance of adenosine triphosphate (ATP) and nicotinamide adenine dinucleotide (NADH) oxidase increased. Furthermore, direct interspecies electron transfer (DIET) was formed by promoting type IV e-pili between Methanobacterium and Syntrophus, thereby improving the interspecies electron transfer efficiency. The dominant SAO-HM pathway was induced and DIET was formed, which was the internal mechanism of the coupling of GAC and EH to enhance anaerobic biotransformation of phenol.
Collapse
Affiliation(s)
- Yongcun Li
- Department of Municipal Engineering, School of Civil Engineering, Hefei University of Technology, Hefei, 230009, China
- Anhui Provincial Engineering Laboratory for Rural Water Environment and Resources, Hefei, 230009, China
- Anhui Province Key Laboratory of Industrial Wastewater and Environmental Treatment, Hefei, 230024, China
| | - Chunhua He
- Anhui Provincial Engineering Laboratory for Rural Water Environment and Resources, Hefei, 230009, China
- Anhui Province Key Laboratory of Industrial Wastewater and Environmental Treatment, Hefei, 230024, China
- Department of Municipal Engineering, School of Environment and Energy Engineering, Anhui JianZhu University, Hefei, 230009, China
| | - Fang Dong
- Department of Municipal Engineering, School of Civil Engineering, Hefei University of Technology, Hefei, 230009, China
- Anhui Provincial Engineering Laboratory for Rural Water Environment and Resources, Hefei, 230009, China
- Anhui Province Key Laboratory of Industrial Wastewater and Environmental Treatment, Hefei, 230024, China
| | - Shoujun Yuan
- Department of Municipal Engineering, School of Civil Engineering, Hefei University of Technology, Hefei, 230009, China
- Anhui Provincial Engineering Laboratory for Rural Water Environment and Resources, Hefei, 230009, China
- Anhui Province Key Laboratory of Industrial Wastewater and Environmental Treatment, Hefei, 230024, China
| | - Zhenhu Hu
- Department of Municipal Engineering, School of Civil Engineering, Hefei University of Technology, Hefei, 230009, China
- Anhui Provincial Engineering Laboratory for Rural Water Environment and Resources, Hefei, 230009, China
- Anhui Province Key Laboratory of Industrial Wastewater and Environmental Treatment, Hefei, 230024, China
| | - Wei Wang
- Department of Municipal Engineering, School of Civil Engineering, Hefei University of Technology, Hefei, 230009, China.
- Anhui Provincial Engineering Laboratory for Rural Water Environment and Resources, Hefei, 230009, China.
- Anhui Province Key Laboratory of Industrial Wastewater and Environmental Treatment, Hefei, 230024, China.
| |
Collapse
|
4
|
Yellezuome D, Zhu X, Liu X, Liu X, Liu R, Wang Z, Li Y, Sun C, Hemida Abd-Alla M, Rasmey AHM. Integration of two-stage anaerobic digestion process with in situ biogas upgrading. BIORESOURCE TECHNOLOGY 2023; 369:128475. [PMID: 36509302 DOI: 10.1016/j.biortech.2022.128475] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Revised: 12/05/2022] [Accepted: 12/06/2022] [Indexed: 06/17/2023]
Abstract
High impurity concentration of biogas limits its wide commercial utilization. Therefore, the integration of two-stage anaerobic digestion process with in situ biogas upgrading technologies is reviewed, with emphasis on their principles, main influencing factors, research success, and technical challenges. The crucial factors that influence these technologies are pH, alkalinity, and hydrogenotrophic methanogenesis. Hence, pH fluctuation and low gas-liquid mass transfer of H2 are some major technical challenges limiting the full-scale application of in situ upgrading techniques. Two-stage anaerobic digestion integration with various in situ upgrading techniques to form a hybrid system is proposed to overcome the constraints and systematically guide future research design and advance the development and commercialization of these techniques. This review intends to provide the current state of in situ biogas upgrading technologies and identify knowledge gaps that warrant further investigation to advance their development and practical implementation.
Collapse
Affiliation(s)
- Dominic Yellezuome
- Biomass Energy Engineering Research Centre, School of Agriculture and Biology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, PR China; Shanghai Yangtze River Delta Eco-environmental Change and Management Observation and Research Station, Ministry of Science and Technology, 800 Dongchuan Road, Shanghai 200240, PR China
| | - Xianpu Zhu
- Biomass Energy Engineering Research Centre, School of Agriculture and Biology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, PR China; Shanghai Yangtze River Delta Eco-environmental Change and Management Observation and Research Station, Ministry of Science and Technology, 800 Dongchuan Road, Shanghai 200240, PR China
| | - Xin Liu
- Biomass Energy Engineering Research Centre, School of Agriculture and Biology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, PR China; Shanghai Yangtze River Delta Eco-environmental Change and Management Observation and Research Station, Ministry of Science and Technology, 800 Dongchuan Road, Shanghai 200240, PR China
| | - Xuwei Liu
- Biomass Energy Engineering Research Centre, School of Agriculture and Biology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, PR China; Shanghai Yangtze River Delta Eco-environmental Change and Management Observation and Research Station, Ministry of Science and Technology, 800 Dongchuan Road, Shanghai 200240, PR China
| | - Ronghou Liu
- Biomass Energy Engineering Research Centre, School of Agriculture and Biology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, PR China; Shanghai Yangtze River Delta Eco-environmental Change and Management Observation and Research Station, Ministry of Science and Technology, 800 Dongchuan Road, Shanghai 200240, PR China.
| | - Zengzhen Wang
- Biomass Energy Engineering Research Centre, School of Agriculture and Biology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, PR China; Shanghai Yangtze River Delta Eco-environmental Change and Management Observation and Research Station, Ministry of Science and Technology, 800 Dongchuan Road, Shanghai 200240, PR China
| | - Yingkai Li
- Biomass Energy Engineering Research Centre, School of Agriculture and Biology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, PR China; Shanghai Yangtze River Delta Eco-environmental Change and Management Observation and Research Station, Ministry of Science and Technology, 800 Dongchuan Road, Shanghai 200240, PR China
| | - Chen Sun
- College of Biological, Chemical Science and Engineering, Jiaxing University, Jiaxing, Zhejiang Province 314001, PR China
| | - Mohamed Hemida Abd-Alla
- Botany and Microbiology Department, Faculty of Science, Assiut University, Assiut 71516, Egypt
| | - Abdel-Hamied M Rasmey
- Botany and Microbiology Department, Faculty of Science, Suez University, Suez 43721, Egypt
| |
Collapse
|
5
|
Mineo A, Cosenza A, Mannina G. Sewage sludge acidogenic fermentation for organic resource recovery towards carbon neutrality: An experimental survey testing the headspace influence. BIORESOURCE TECHNOLOGY 2023; 367:128217. [PMID: 36332859 DOI: 10.1016/j.biortech.2022.128217] [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: 08/31/2022] [Revised: 10/24/2022] [Accepted: 10/25/2022] [Indexed: 06/16/2023]
Abstract
Volatile fatty acids (VFAs) produced by acidogenic digestion of sewage sludge are very interesting bio-products which can contribute to carbon neutrality of wastewater treatment plants. Studies on the production of VFAs from sewage sludge from fermenters with membrane are limited. In view of above, VFAs from a fermenter pilot plant equipped with a membrane bioreactor and fed with real sewage sludge has been monitored. The effect of headspace volume (HdV) on VFA production was studied for the first time to elucidate the optimal operation conditions. Specifically, three fermenter HdV values (namely, 20, 40 and 60% of the total volume) have been investigated. Results revealed that the HdV of 20% ensured the highest sCOD production (900 mgCOD/L) and VFA/COD ratio (45.4%). High value of HdV (namely, 40 and 60%) strongly decreased the acidogenic fermentation performance in terms of VFA production.
Collapse
Affiliation(s)
- Antonio Mineo
- Engineering Department, Palermo University, Viale delle Scienze bldg. 8, 90128 Palermo, Italy
| | - Alida Cosenza
- Engineering Department, Palermo University, Viale delle Scienze bldg. 8, 90128 Palermo, Italy.
| | - Giorgio Mannina
- Engineering Department, Palermo University, Viale delle Scienze bldg. 8, 90128 Palermo, Italy
| |
Collapse
|
6
|
Tang T, Chen Y, Liu M, Du Y, Tan Y. Effect of pH on the performance of hydrogen production by dark fermentation coupled denitrification. ENVIRONMENTAL RESEARCH 2022; 208:112663. [PMID: 34995549 DOI: 10.1016/j.envres.2021.112663] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Revised: 12/15/2021] [Accepted: 12/30/2021] [Indexed: 06/14/2023]
Abstract
High concentration nitrogen-containing organic wastewater is a potential substrate for hydrogen production by dark fermentation. In this study, the effect of initial pH on the performance of hydrogen production by dark fermentation coupled denitrification was investigated. The hydrogen production, liquid metabolites, nitrate, nitrite and microbial community were monitored under the condition of pH varying from 4 to 11. Results showed that the highest hydrogen production (70.94 ± 4.750 mL/g VSS), chemical oxygen demand (COD) removal rate (37.13 ± 1.86%) and nitrate reduction rate (1.57 ± 0.27 mg/L/h) were obtained at pH of 5. Under this condition, the nitrate was mainly reduced to N2 with hydrogen as the electron donor. When the initial pH was 6-11, nitrate mainly reduced to N2 through co-action with acetate. Microbial community analysis revealed that as the initial pH increased from 4 to 11, the main hydrogen-producing microorganisms were gradually converted from Clostridium sensu stricto 12 sp. into Clostridium sensu stricto 1 sp, which leaded to changes in the hydrogen production process.
Collapse
Affiliation(s)
- Taotao Tang
- College of Architecture and Environment, Sichuan University, Chengdu, 610065, PR China
| | - Ying Chen
- College of Architecture and Environment, Sichuan University, Chengdu, 610065, PR China
| | - Min Liu
- College of Architecture and Environment, Sichuan University, Chengdu, 610065, PR China.
| | - Ye Du
- College of Architecture and Environment, Sichuan University, Chengdu, 610065, PR China
| | - Yichuan Tan
- College of Architecture and Environment, Sichuan University, Chengdu, 610065, PR China
| |
Collapse
|
7
|
Ren L, Kong X, Su J, Zhao D, Dong W, Liu C, Liu C, Luo L, Yan B. Oriented conversion of agricultural bio-waste to value-added products - A schematic review towards key nutrient circulation. BIORESOURCE TECHNOLOGY 2022; 346:126578. [PMID: 34953993 DOI: 10.1016/j.biortech.2021.126578] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2021] [Revised: 12/10/2021] [Accepted: 12/11/2021] [Indexed: 06/14/2023]
Abstract
Agriculture bio-waste is one of the largest sectors for nutrient circulation and resource recovery. This review intends to summarize the possible scheme through coupling chemical conversion of crop straws to biochar and biological conversion of livestock waste to value-added products thus reaching key nutrient circulation. Chemical conversion of crop straws to biochar was reviewed through summarizing the preparation methods and functional modification of biochar. Then, high-solid two-phase anaerobic conversion of agriculture bio-waste to value-added products and improved performance of bio-conversion through byproduct gases reuse and biochar supplementation were reviewed. Finally, high quality compost production through amendment of biochar and residual digestate was proposed with analysis of reduced nitrogen emission and carbon balance. The biological mechanism of synergistic regulation of carbon and nitrogen loss during bio-conversion with biochar was also reviewed. This will provide a model for synergistic conversion of agricultural wastes to value added products pursuing key nutrient circulation.
Collapse
Affiliation(s)
- Liheng Ren
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
| | - Xiaoliang Kong
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
| | - Jian Su
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
| | - Danyang Zhao
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
| | - Wenjian Dong
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
| | - Chunmiao Liu
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
| | - Chao Liu
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
| | - Lin Luo
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China
| | - Binghua Yan
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China.
| |
Collapse
|
8
|
Xu S, Qiao Z, Luo L, Sun Y, Wong JWC, Geng X, Ni J. On-site CO 2 bio-sequestration in anaerobic digestion: Current status and prospects. BIORESOURCE TECHNOLOGY 2021; 332:125037. [PMID: 33840612 DOI: 10.1016/j.biortech.2021.125037] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2021] [Revised: 03/15/2021] [Accepted: 03/17/2021] [Indexed: 06/12/2023]
Abstract
The advantages of anaerobic digestion (AD) technology in organic solid waste treatment for bioenergy recovery are evidenced in worldwide. Recently, more attention has been paid to on-site biogas research, as well as biogenic CO2 sequestration from AD plant, to promote "carbon neutral". Single-phase and two-phase AD system can be incorporated with various CO2 bioconversion technologies through H2 mediated CO2 bioconversion (in-situ and ex-situ biogas upgrading), or other emerging strategies for CO2 fixation without exogenous H2 injection; these include in-situ direct interspecies electron transfer reinforcement, electromethanogenesis, and off-gas reutilization. The existing and potential scenarios for on-site CO2 bio-sequestration within the AD framework are reviewed from the perspectives of metabolic pathways, functional microorganisms, the limitations on reaction kinetics. This review concluded that on-site CO2 bio-sequestration is a promising solution to reduce greenhouse gas emissions and increase renewable energy recovery.
Collapse
Affiliation(s)
- Suyun Xu
- School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
| | - Zihao Qiao
- School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
| | - Liwen Luo
- Institute of Bioresource and Agriculture, Hong Kong Baptist University, Hong Kong Special Administrative Region, China; Department of Biology, Hong Kong Baptist University, Hong Kong Special Administrative Region, China
| | - Yongqi Sun
- School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
| | - Jonathan Woon-Chung Wong
- Institute of Bioresource and Agriculture, Hong Kong Baptist University, Hong Kong Special Administrative Region, China; Department of Biology, Hong Kong Baptist University, Hong Kong Special Administrative Region, China.
| | - Xueyu Geng
- School of Engineering, University of Warwick, Coventry CV4 7AL, United Kingdom
| | - Jing Ni
- School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China
| |
Collapse
|
9
|
Huang J, Zhao Y, Lei C, Liu Y, Wang Y. The effect of reduced pressure and glucose concentration on hydrogen and volatile fatty acid yield: The role of homoacetogenesis. BIORESOURCE TECHNOLOGY 2021; 329:124830. [PMID: 33639380 DOI: 10.1016/j.biortech.2021.124830] [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: 01/20/2021] [Revised: 02/03/2021] [Accepted: 02/04/2021] [Indexed: 06/12/2023]
Abstract
In this study, the influence of headspace pressure (HP; 20-100 kPa) and organic loading rate (OLR; 10-30 g/L) on H2 and volatile fatty acid (VFA) yield were investigated. The experiments were carried out in the semi-continuous mode, the main products in VFAs were ethanol and butyrate, which accounted for more than 75%. More than 79% generated H2 was consumed through homoacetogenesis pathway when HP was 100 kPa, and lowing HP could effectively promote the accumulation of H2 (increased by at least 2 times). Even though consumed H2 through homoacetogenesis was related to OLR and HP, the lower HP was more likely to reduce this part H2 consumption, especially under 10 g/L condition. As for acid production rate, both OLR and HP have a significant effect (p < 0.05). Maximum acid production rate was 489.86 mg-COD/g-CODdegrade·d-1when OLR was 20 g/L and HP was 40 kPa.
Collapse
Affiliation(s)
- Jialong Huang
- College of Engineering, Huazhong Agricultural University, Wuhan 430070, PR China; Key Laboratory of Agricultural Equipment in Mid-lower Yangtze River, PR China
| | - Yongkun Zhao
- College of Engineering, Huazhong Agricultural University, Wuhan 430070, PR China; Key Laboratory of Agricultural Equipment in Mid-lower Yangtze River, PR China
| | - Chen'ao Lei
- College of Engineering, Huazhong Agricultural University, Wuhan 430070, PR China; Key Laboratory of Agricultural Equipment in Mid-lower Yangtze River, PR China
| | - Yu Liu
- College of Engineering, Huazhong Agricultural University, Wuhan 430070, PR China
| | - Yuanyuan Wang
- College of Engineering, Huazhong Agricultural University, Wuhan 430070, PR China; Key Laboratory of Agricultural Equipment in Mid-lower Yangtze River, PR China.
| |
Collapse
|
10
|
He C, Liu T, Ou H, Yuan S, Hu Z, Wang W. Coupling granular activated carbon and exogenous hydrogen to enhance anaerobic digestion of phenol via predominant syntrophic acetate oxidation and hydrogenotrophic methanogenesis pathway. BIORESOURCE TECHNOLOGY 2021; 323:124576. [PMID: 33401163 DOI: 10.1016/j.biortech.2020.124576] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2020] [Revised: 12/12/2020] [Accepted: 12/15/2020] [Indexed: 06/12/2023]
Abstract
Anaerobic digestion is a promising biological method for treating phenol-containing wastewater. However, the low methane yield of phenol due to the biological toxicity limits its potential application. This study presents a novel method to enhance the conversion rate of phenol to methane by coupling of granular activated carbon and exogenous hydrogen (GAC/H2). The cumulative methane production in the GAC/H2, H2, GAC, and control groups were 408.2 ± 16.2, 336.5 ± 5.7, 287.2 ± 26. 2, and 258.1 ± 8.6 mL CH4/g COD, respectively. Compared with the control group, the hydrogenotrophic methanogenic activity and electron transfer activity of GAC/H2 group were increased by 403.9 and 367.4%, respectively. The results of the 16SrRNA analysis indicated GAC enhanced the relative abundances of Syntrophus and Syntrophorhabdus, and hydrogen promoted the relative abundances of Cryptanaerobacter, Aminicenantes, and Methanobacterium. Therefore, the coupling of GAC and exogenous hydrogen promoted a dominate SAO-HM pathway to convert phenol to methane.
Collapse
Affiliation(s)
- Chunhua He
- Department of Municipal Engineering, School of Civil Engineering, Hefei University of Technology, Hefei 230009, China; Anhui Provincial Engineering Laboratory for Rural Water Environment and Resources, Hefei 230009, China
| | - Tingxia Liu
- Department of Municipal Engineering, School of Civil Engineering, Hefei University of Technology, Hefei 230009, China; Anhui Provincial Engineering Laboratory for Rural Water Environment and Resources, Hefei 230009, China
| | - Hua Ou
- Department of Municipal Engineering, School of Civil Engineering, Hefei University of Technology, Hefei 230009, China; Anhui Provincial Engineering Laboratory for Rural Water Environment and Resources, Hefei 230009, China
| | - Shoujun Yuan
- Department of Municipal Engineering, School of Civil Engineering, Hefei University of Technology, Hefei 230009, China; Anhui Provincial Engineering Laboratory for Rural Water Environment and Resources, Hefei 230009, China
| | - Zhenhu Hu
- Department of Municipal Engineering, School of Civil Engineering, Hefei University of Technology, Hefei 230009, China; Anhui Provincial Engineering Laboratory for Rural Water Environment and Resources, Hefei 230009, China
| | - Wei Wang
- Department of Municipal Engineering, School of Civil Engineering, Hefei University of Technology, Hefei 230009, China; Anhui Provincial Engineering Laboratory for Rural Water Environment and Resources, Hefei 230009, China.
| |
Collapse
|
11
|
Liu C, Ren L, Yan B, Luo L, Zhang J, Awasthi MK. Electron transfer and mechanism of energy production among syntrophic bacteria during acidogenic fermentation: A review. BIORESOURCE TECHNOLOGY 2021; 323:124637. [PMID: 33421831 DOI: 10.1016/j.biortech.2020.124637] [Citation(s) in RCA: 33] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2020] [Revised: 12/25/2020] [Accepted: 12/26/2020] [Indexed: 06/12/2023]
Abstract
Volatile fatty acids (VFAs) production plays an important role in the process of anaerobic digestion (AD), which is often the critical factor determining the metabolic pathways and energy recovery efficiency. Fermenting bacteria and acetogenic bacteria are in syntrophic relations during AD. Thus, clear elucidation of the interspecies electron transfer and energetic mechanisms among syntrophic bacteria is essential for optimization of acidogenic. This review aims to discuss the electron transfer and energetic mechanism in syntrophic processes between fermenting bacteria and acetogenic bacteria during VFAs production. Homoacetogenesis also plays a role in the syntrophic system by converting H2 and CO2 to acetate. Potential applications of these syntrophic activities in bioelectrochemical system and value-added product recovery from AD of organic wastes are also discussed. The study of acidogenic syntrophic relations is in its early stages, and additional investigation is required to better understand the mechanism of syntrophic relations.
Collapse
Affiliation(s)
- Chao Liu
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, PR China
| | - Liheng Ren
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, PR China
| | - Binghua Yan
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, PR China
| | - Lin Luo
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, PR China
| | - Jiachao Zhang
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, PR China
| | - Mukesh Kumar Awasthi
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province 712100, PR China; Swedish Centre for Resource Recovery, University of Borås, 50190 Borås, Sweden.
| |
Collapse
|
12
|
Tsui TH, Wu H, Song B, Liu SS, Bhardwaj A, Wong JWC. Food waste leachate treatment using an Upflow Anaerobic Sludge Bed (UASB): Effect of conductive material dosage under low and high organic loads. BIORESOURCE TECHNOLOGY 2020; 304:122738. [PMID: 32106021 DOI: 10.1016/j.biortech.2020.122738] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2019] [Revised: 12/31/2019] [Accepted: 01/02/2020] [Indexed: 06/10/2023]
Abstract
In this study, the performance of UASB for treating food waste leachate was investigated, with the objective of studying the effect of conductive material on anaerobic digestion (AD) enhancement at two organic loads. Conductive and control materials (i.e. graphite and glass) were first compared for their surface porosity then dosed in UASB for side-by-side comparison of the corresponding AD performance. In the first phase (organic load of 2660 mg-COD/L), compared to glass-added UASB, 29.5% reduction of effluent COD was observed in graphite-added UASB, however, only a little biogas enhancement (2.3%) was achieved. In the second phase (organic load of 4140 mg-COD/L), the results show that it could promote better AD enhancement in graphite-added UASB, where 36% effluent COD and 38% biogas production enhancement were simultaneously observed. The overall results support that utilization of conductive material is a viable approach for enhancing biogas production in UASB, especially for high organic loads.
Collapse
Affiliation(s)
- To-Hung Tsui
- Institute of Bioresource and Agriculture, Sino-Forest Applied Research Centre for Pearl River Delta Environment and Department of Biology, Hong Kong Baptist University, Kowloon Tong, Hong Kong
| | - Hao Wu
- Institute of Bioresource and Agriculture, Sino-Forest Applied Research Centre for Pearl River Delta Environment and Department of Biology, Hong Kong Baptist University, Kowloon Tong, Hong Kong
| | - Bing Song
- Institute of Bioresource and Agriculture, Sino-Forest Applied Research Centre for Pearl River Delta Environment and Department of Biology, Hong Kong Baptist University, Kowloon Tong, Hong Kong
| | - Shuang-Shuang Liu
- Institute of Bioresource and Agriculture, Sino-Forest Applied Research Centre for Pearl River Delta Environment and Department of Biology, Hong Kong Baptist University, Kowloon Tong, Hong Kong
| | - Anuja Bhardwaj
- Institute of Bioresource and Agriculture, Sino-Forest Applied Research Centre for Pearl River Delta Environment and Department of Biology, Hong Kong Baptist University, Kowloon Tong, Hong Kong
| | - Jonathan W C Wong
- Institute of Bioresource and Agriculture, Sino-Forest Applied Research Centre for Pearl River Delta Environment and Department of Biology, Hong Kong Baptist University, Kowloon Tong, Hong Kong.
| |
Collapse
|
13
|
Yan BH, Selvam A, Wong JWC. Bio-hydrogen and methane production from two-phase anaerobic digestion of food waste under the scheme of acidogenic off-gas reuse. BIORESOURCE TECHNOLOGY 2020; 297:122400. [PMID: 31767429 DOI: 10.1016/j.biortech.2019.122400] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2019] [Revised: 11/05/2019] [Accepted: 11/07/2019] [Indexed: 05/27/2023]
Abstract
Anaerobic hydrolysis of food wastes sourced from bakery (T1), Chinese restaurant (T2), western-style restaurant (T3), and wet market (T4) were performed in leach bed reactors under the scheme of acidogenic off-gas reuse in methanogenic reactor. Results showed that food waste in T3 achieved the highest hydrogen production of 61.0 L/kg·VSadded. Highest activity of hydrogenase in both leachate and digestate samples confirmed the superior performance of H2 production in T3. Mixed acid fermentation with domination of acetate and butyrate was observed in all four treatments, whereas variations in quantification and speciation of the acidogenic products were closely related to the composition of substrates. High volatile solids (VS) removal (76.7%) was observed in T3 while VS reduction rates of the other treatments ranged from 37 to 55%. High COD production of 0.65 gCOD /g·VSadded together with the reuse of elevated acidogenic off-gas ensured the highest specific CH4 production of 0.42 L/g·VSadded in T3.
Collapse
Affiliation(s)
- Bing Hua Yan
- College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China; Sino-Forest Applied Research Centre for Pearl River Delta Environment, Department of Biology, Hong Kong Baptist University, Hong Kong Special Administrative Region, China
| | - Ammaiyappan Selvam
- Sino-Forest Applied Research Centre for Pearl River Delta Environment, Department of Biology, Hong Kong Baptist University, Hong Kong Special Administrative Region, China; Department of Plant Science, Manonmaniam Sundaranar University, Abishekapatti, Tirunelveli 627 012, Tamil Nadu, India
| | - Jonathan W C Wong
- Sino-Forest Applied Research Centre for Pearl River Delta Environment, Department of Biology, Hong Kong Baptist University, Hong Kong Special Administrative Region, China.
| |
Collapse
|
14
|
Yuan Y, Hu X, Chen H, Zhou Y, Zhou Y, Wang D. Advances in enhanced volatile fatty acid production from anaerobic fermentation of waste activated sludge. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 694:133741. [PMID: 31756829 DOI: 10.1016/j.scitotenv.2019.133741] [Citation(s) in RCA: 86] [Impact Index Per Article: 17.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2019] [Revised: 08/01/2019] [Accepted: 08/01/2019] [Indexed: 06/10/2023]
Abstract
Low acid production and acid-forming process instability are becoming the major issues to limit the popularization of anaerobic fermentation to produce volatile fatty acid. Considerable research efforts have been made to address these problems, from studying the microorganisms that are primarily responsible for or detrimental to this process, to determining their biochemical pathways and developing mathematical models that facilitate better prediction of process performance to identify the mechanism and optimization of process control. A limited understanding of the complex microbiology and biochemistry of anaerobic fermentation is the primary cause of acid production upset or failure. This review critically assesses the recent advances in enhanced volatile fatty acid production from anaerobic fermentation of waste activated sludge from micro to macro scale, particularly relating to the microbiology, biochemistry, impact factors, and enhancement methods. Previous results suggest that further studies are necessary to substantially promote the efficiency and stability of acid production. One of the promising directions appears to be integrating the existing and growing pretreatment technologies and fermentation processes to enhance metabolic pathways of acetogens but inhibit activities of methanogens, which this study hopes to partially achieve.
Collapse
Affiliation(s)
- Yayi Yuan
- College of Environment and Resources, Xiangtan University, Xiangtan 411105, China
| | - Xiayi Hu
- College of Chemical Engineering, Xiangtan University 411105, China
| | - Hongbo Chen
- College of Environment and Resources, Xiangtan University, Xiangtan 411105, China.
| | - Yaoyu Zhou
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, China
| | - Yefeng Zhou
- College of Chemical Engineering, Xiangtan University 411105, China
| | - Dongbo Wang
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, China.
| |
Collapse
|
15
|
Li L, Li Y, Yasser Farouk R, Wang Y. Three-ways changed in headspace air on anaerobic fermentation. BIORESOURCE TECHNOLOGY 2019; 289:121684. [PMID: 31247528 DOI: 10.1016/j.biortech.2019.121684] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2019] [Revised: 06/16/2019] [Accepted: 06/18/2019] [Indexed: 06/09/2023]
Abstract
Different headspace condition has a great influence on fermentation process. In this study, whey protein was used as substrate, and the headspace air was changed in three different ways (H2 mixed N2, H2 mixed CO2, N2 with different sparging rates) to explore the effects of these three methods on products. The result showed that H2 mixed with CO2 is more conducive to acid production. Homoacetogenesis played a central role in fermentation process. There is a turning point in the role of hydrogen and Homoacetogenesis, which is when the partial pressure of hydrogen is 0.268 atm. In the first two conditions, the acid concentration increased with the increase of hydrogen percentage. Nitrogen sparging way is adverse to acid production, but conducive to gas production.
Collapse
Affiliation(s)
- Leigang Li
- College of Engineering, Huazhong Agricultural University, Wuhan 430070, PR China
| | - Yu Li
- College of Engineering, Huazhong Agricultural University, Wuhan 430070, PR China
| | - Reham Yasser Farouk
- College of Engineering, Huazhong Agricultural University, Wuhan 430070, PR China; Department of Agricultural Engineering, Faculty of Agriculture, Cairo University, 12613 Giza, Egypt
| | - Yuanyuan Wang
- College of Engineering, Huazhong Agricultural University, Wuhan 430070, PR China.
| |
Collapse
|
16
|
Kaur G, Luo L, Chen G, Wong JWC. Integrated food waste and sewage treatment - A better approach than conventional food waste-sludge co-digestion for higher energy recovery via anaerobic digestion. BIORESOURCE TECHNOLOGY 2019; 289:121698. [PMID: 31260933 DOI: 10.1016/j.biortech.2019.121698] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2019] [Revised: 06/21/2019] [Accepted: 06/22/2019] [Indexed: 06/09/2023]
Abstract
This work proposes a new treatment approach involving both food waste disposal and sewerage treatment called MOWFAST i.e. Municipal Organic Waste management by combined Food waste disposal and Sewerage Treatment. MOWFAST involves mixing of food waste directly with raw sewage instead of separate addition to sludge and their combined anaerobic digestion (AD). Compared to conventional sludge digestion, MOWFAST exhibited better digestion capability and allowed a greater degradation of organic material along with higher production of methanogenic-favourable products from the beginning of digestion. This resulted in producing higher specific methane yields (7.86 LCH4/kg VSadded versus 0.95 LCH4/kg VSadded) and 1.4-fold higher cumulative methane yield over sludge AD. Furthermore, compared with conventional food waste-sludge co-digestion, MOWFAST gave higher solubilization of organic material (0.82 g sCOD/g VSadded versus 0.23 g sCOD/g VSadded) and specific methane yields (7.86 LCH4/kg VSadded versus 3.2 LCH4/kg VSadded). This proves its feasibility for digestion and methane generation potential.
Collapse
Affiliation(s)
- Guneet Kaur
- Department of Biology, Hong Kong Baptist University, Kowloon Tong, Hong Kong.
| | - Liwen Luo
- Department of Biology, Hong Kong Baptist University, Kowloon Tong, Hong Kong; Sino-Forest Applied Research Centre for Pearl River Delta Environment, Hong Kong Baptist University, Kowloon Tong, Hong Kong.
| | - Guanghao Chen
- Department of Civil and Environmental Engineering, The Hong Kong University of Science & Technology, Clear Water Bay, Hong Kong.
| | - Jonathan W C Wong
- Department of Biology, Hong Kong Baptist University, Kowloon Tong, Hong Kong; Sino-Forest Applied Research Centre for Pearl River Delta Environment, Hong Kong Baptist University, Kowloon Tong, Hong Kong.
| |
Collapse
|
17
|
Zhou M, Yan B, Lang Q, Zhang Y. Elevated volatile fatty acids production through reuse of acidogenic off-gases during electro-fermentation. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 668:295-302. [PMID: 30852206 DOI: 10.1016/j.scitotenv.2019.03.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Revised: 02/27/2019] [Accepted: 03/01/2019] [Indexed: 06/09/2023]
Abstract
Electro-fermentation is gaining attention for its advantage in promoting product recovery and valorization of organic wastes. However, emission of by-product gases during acidogenic fermentation is one of the key reasons for reduced product recovery whereas high gas pressure in the acidogenic headspace could pose an inhibitory effect on the production of volatile fatty acids (VFAs). This study presents a novel electro-fermentation (EF) system for enhancing VFAs production by in situ reuse of anodic off-gases (mainly CO2 and H2) in the cathode. A total VFAs production of 0.57 g-VFAs/g-VS was achieved through reuse of acidogenic off-gases in EF system, corresponding to 48.70% increase in comparison with the treatment without off-gases reuse. Consequently, the conversion efficiency of carbon to VFAs was improved significantly by 13.92%. Acidogenic metabolic pathway in the anode shifted to mixed -acid fermentation with the succession of dominant microbes from genus of Escherichia in the seeding inocula to Bacteroides and Desulfovibrio in the anode and cathode chambers, respectively. This would provide a way to enhance VFAs recovery from organic wastes, which also contributes to reduced carbon footprint and increased environmental sustainability.
Collapse
Affiliation(s)
- Miaomiao Zhou
- Lab of Waste Valorization and Water Reuse, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China; State Key Laboratory of Petroleum Pollution Control, Beijing 102206, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Binghua Yan
- Lab of Waste Valorization and Water Reuse, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China.
| | - Qiaolin Lang
- Lab of Waste Valorization and Water Reuse, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China
| | - Yang Zhang
- Lab of Waste Valorization and Water Reuse, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China
| |
Collapse
|
18
|
Luo L, Kaur G, Wong JWC. A mini-review on the metabolic pathways of food waste two-phase anaerobic digestion system. WASTE MANAGEMENT & RESEARCH : THE JOURNAL OF THE INTERNATIONAL SOLID WASTES AND PUBLIC CLEANSING ASSOCIATION, ISWA 2019; 37:333-346. [PMID: 30696377 DOI: 10.1177/0734242x18819954] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Food waste (FW) disposal has become a global social, environmental, and economic problem. The current practice of landfilling is undesirable due to its potential emission of greenhouse gas, nutrient recycling, and pollution of water resources. Anaerobic digestion (AD), particularly two-phase AD is a promising option to manage FW and recover energy in the form of methane and obtain value-added by-products. However, most current review literature focuses on operating conditions while often placing little emphasis on improving conversion efficiency through regulating intermediate products. The AD process involves complex metabolic reactions carried out by several microbial groups. Therefore, understanding of these metabolic pathways existing in AD is the key to design effective strategies for enrichment of specific microbial groups which can produce desired intermediates for methane production, which can possibly be achieved by an understanding of the influence of critical process parameters on these metabolic pathways. Thus, it is the aim of this review to describe the effect of process conditions on underlying metabolic pathways in order to allow an efficient manipulation of these pathways for enhancing methane production.
Collapse
Affiliation(s)
- Liwen Luo
- Sino-Forest Applied Research Centre for Pearl River Delta Environment and Department of Biology, Hong Kong Baptist University, Hong Kong SAR, Hong Kong
| | - Guneet Kaur
- Sino-Forest Applied Research Centre for Pearl River Delta Environment and Department of Biology, Hong Kong Baptist University, Hong Kong SAR, Hong Kong
| | - Jonathan W C Wong
- Sino-Forest Applied Research Centre for Pearl River Delta Environment and Department of Biology, Hong Kong Baptist University, Hong Kong SAR, Hong Kong
| |
Collapse
|
19
|
Awasthi SK, Joshi R, Dhar H, Verma S, Awasthi MK, Varjani S, Sarsaiya S, Zhang Z, Kumar S. Improving methane yield and quality via co-digestion of cow dung mixed with food waste. BIORESOURCE TECHNOLOGY 2018; 251:259-263. [PMID: 29287278 DOI: 10.1016/j.biortech.2017.12.063] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2017] [Revised: 12/19/2017] [Accepted: 12/20/2017] [Indexed: 06/07/2023]
Abstract
Methane (CH4) production and quality were enhanced by the co-digestion of cow dung and food waste (FW) mixed with organic fraction of municipal solid waste (OFMSW) under optimized conditions in bench and semi continuous-scale mode for a period of 30 days. A bacterium capable of high yield of CH4 was enriched and isolated by employing activated sewage sludge as the inoculums. The thirteen bacterial isolates were identified through morphological and biochemical tests. Gas chromatography was used to analyze the chemical compositions of the generated biogas. CH4 yields were significantly higher during co-digestion of Run II (7.59 L) than Run I (3.7 L). Therefore, the co-digestion of FW with OFMSW and Run II was observed to be a competent method for biogas conversion from organic waste resources.
Collapse
Affiliation(s)
- Sanjeev Kumar Awasthi
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province 712100, China; Solid and Hazardous Waste Management Division, CSIR-National Environmental Engineering Research Institute (CSIR-NEERI), Nagpur 440 020, Maharashtra, India
| | - Rutu Joshi
- Solid and Hazardous Waste Management Division, CSIR-National Environmental Engineering Research Institute (CSIR-NEERI), Nagpur 440 020, Maharashtra, India
| | - Hiya Dhar
- Solid and Hazardous Waste Management Division, CSIR-National Environmental Engineering Research Institute (CSIR-NEERI), Nagpur 440 020, Maharashtra, India
| | - Shivpal Verma
- Solid and Hazardous Waste Management Division, CSIR-National Environmental Engineering Research Institute (CSIR-NEERI), Nagpur 440 020, Maharashtra, India
| | - Mukesh Kumar Awasthi
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province 712100, China; Department of Biotechnology, Amicable Knowledge Solution University, Satna, India
| | - Sunita Varjani
- Gujarat Pollution Control Board, Sector-10A, Gandhinagar 382010, Gujarat, India
| | - Surendra Sarsaiya
- Key Laboratory of Basic Pharmacology of Ministry of Education, Zunyi Medical University, Zunyi, Guizhou, China
| | - Zengqiang Zhang
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province 712100, China
| | - Sunil Kumar
- Solid and Hazardous Waste Management Division, CSIR-National Environmental Engineering Research Institute (CSIR-NEERI), Nagpur 440 020, Maharashtra, India.
| |
Collapse
|