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Heryakusuma C, Johnson EF, Purwantini E, Mukhopadhyay B. Nitrite reductase activity in F 420-dependent sulphite reductase (Fsr) from Methanocaldococcus jannaschii. Access Microbiol 2023; 5:000482.v3. [PMID: 37223055 PMCID: PMC10202398 DOI: 10.1099/acmi.0.000482.v3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Accepted: 01/25/2023] [Indexed: 05/25/2023] Open
Abstract
Methanocaldococcus jannaschii (Mj), a hyperthermophilic and evolutionarily deeply rooted methanogenic archaeon from a deep-sea hydrothermal vent, produces F420-dependent sulphite reductase (Fsr) in response to exposure to sulphite. This enzyme allows Mj to detoxify sulphite, a potent inhibitor of methyl coenzyme-M reductase (Mcr), by reducing it to sulphide with reduced coenzyme F420 (F420H2) as an electron donor; Mcr is essential for energy production for a methanogen. Fsr allows Mj to utilize sulphite as a sulphur source. Nitrite is another potent inhibitor of Mcr and is toxic to methanogens. It is reduced by most sulphite reductases. In this study, we report that MjFsr reduced nitrite to ammonia with F420H2 with physiologically relevant K m values (nitrite, 8.9 µM; F420H2, 9.7 µM). The enzyme also reduced hydroxylamine with a K m value of 112.4 µM, indicating that it was an intermediate in the reduction of nitrite to ammonia. These results open the possibility that Mj could use nitrite as a nitrogen source if it is provided at a low concentration of the type that occurs in its habitat.
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Affiliation(s)
- Christian Heryakusuma
- Genetics, Bioinformatics, and Computational Biology Ph.D. Program, Virginia Tech, Blacksburg, VA 24061, USA
- Department of Biochemistry, Virginia Tech, Blacksburg, VA 24061, USA
| | - Eric F. Johnson
- Department of Biochemistry, Virginia Tech, Blacksburg, VA 24061, USA
| | - Endang Purwantini
- Department of Biochemistry, Virginia Tech, Blacksburg, VA 24061, USA
| | - Biswarup Mukhopadhyay
- Genetics, Bioinformatics, and Computational Biology Ph.D. Program, Virginia Tech, Blacksburg, VA 24061, USA
- Department of Biochemistry, Virginia Tech, Blacksburg, VA 24061, USA
- Virginia Tech Carilion School of Medicine, Virginia Tech, Blacksburg, VA 24061, USA
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Zhao L, Gao Y, Sun J, Wang Y, Wang C, Yu S, Wang Z, Li J, Liu R, Kou W. The Role of Slurry Reflux in a Corn Stalk Continuous Anaerobic Digestion System: Performance and Microbial Community. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2023; 20:1687. [PMID: 36767055 PMCID: PMC9914328 DOI: 10.3390/ijerph20031687] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/06/2022] [Revised: 01/12/2023] [Accepted: 01/13/2023] [Indexed: 06/18/2023]
Abstract
Slurry reflux is a low-cost slurry reduction technology, which can solve the problem that a large amount of slurry cannot be completely consumed in a biogas plant. Anaerobic digestion (AD) of corn stalks with slurry reflux and non-reflux was compared and evaluated in continuous anaerobic digestion to clarify the effects of slurry reflux on AD with organic loading rate (OLR) variation. It was found that slurry reflux increased cumulative methane production and improved system stability. The average methane yield of the slurry reflux group was 224.19 mL/gVS, which was 41.35% higher than that of the non-reflux group. High-throughput sequencing results showed that slurry reflux increased the microbial community richness. The dominant microorganisms in the reflux group were in phylum Bacteroidetes, which have the capacity to degrade polymers, and Methanothrix, which is an aceticlastic methanogen. The relative abundances of Bacteroidetes and Methanothrix were 32.41% and 41.75%, respectively. Clostridium III and Saccharofermentans, which are related to syntrophic acetate oxidation and hydrolysis, were increased in relative abundance in the slurry reflux system. The increase of the OLR altered the main methane-producing pathway from the acetoclastic methanogenic pathway to the hydrogenotrophic methanogenic pathway in the AD system, and the slurry reflux can delay this trend. This study provided an effective way for the reduction and utilization of slurry in a biogas plant.
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Affiliation(s)
- Ling Zhao
- College of Engineering, Shenyang Agricultural University, Shenyang 110866, China
| | - Yang Gao
- College of Engineering, Shenyang Agricultural University, Shenyang 110866, China
| | - Jiaxing Sun
- College of Engineering, Shenyang Agricultural University, Shenyang 110866, China
| | - Yanan Wang
- College of Engineering, Shenyang Agricultural University, Shenyang 110866, China
| | - Congxin Wang
- College of Engineering, Shenyang Agricultural University, Shenyang 110866, China
| | - Shuai Yu
- College of Engineering, Shenyang Agricultural University, Shenyang 110866, China
| | - Zhen Wang
- College of Engineering, Shenyang Agricultural University, Shenyang 110866, China
| | - Jingyang Li
- College of Engineering, Shenyang Agricultural University, Shenyang 110866, China
| | - Ronghou Liu
- Biomass Energy Engineering Research Centre, School of Agriculture and Biology, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Wei Kou
- Department of Chemistry and Environmental Engineering, Yingkou Institute of Technology, Yingkou 115014, China
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3
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Methane production from ethanolic and acid fermentations of the organic fraction of municipal solid waste under different pH and reaction times. Biochem Eng J 2022. [DOI: 10.1016/j.bej.2022.108743] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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4
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Zheng Y, Wang P, Yang X, Zhao L, Ren L, Li J. Metagenomics insight into bioaugmentation mechanism of Propionibacterium acidipropionici during anaerobic acidification of kitchen waste. BIORESOURCE TECHNOLOGY 2022; 362:127843. [PMID: 36031136 DOI: 10.1016/j.biortech.2022.127843] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2022] [Revised: 08/19/2022] [Accepted: 08/22/2022] [Indexed: 06/15/2023]
Abstract
In the present study, a biochemical strategy for improving propionic acid production from kitchen waste acidification by bioaugmentation with Propionibacterium acidipropionici (P. acidipropionici) was investigated. When the inoculum of P. acidipropionici was 30% (w/w) of the seeding sludge, the propionic acid production increased by 79.57%. Further, bioaugmentation improved the relative abundance of Firmicute and Actinobacteria. The results of metagenomic analysis further reveal that the ATP-binding cassette (ABC) transporters and all related pathways of Propanoate metabolism (ko00640) were enriched when P. acidipropionici was added. For Propanoate metabolism, most functional genes involved in the conversion from Glycolysis / Gluconeogenesis (ko00010) to Propanoyl-CoA and conversion from Propanoyl-CoA to propionic acid were enhanced after bioaugmentation with P. acidipropionici, thereby promoting propionic acid production. As such, bioaugmentation with P. acidipropionici was effective in the anaerobic acidification of kitchen waste for propionic acid production.
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Affiliation(s)
- Yi Zheng
- State Environmental Protection Key Laboratory of Food Chain Pollution Control, School of Ecology and Environment, Beijing Technology and Business University, Beijing 100048, China; Organic Recycling Institute (Suzhou) of China Agricultural University, Wuzhong District, Suzhou 215128, China; College of Resources and Environmental Science, Beijing Key Laboratory of Biodiversity and Organic Farming, China Agricultural University, Beijing 100193, China
| | - Pan Wang
- State Environmental Protection Key Laboratory of Food Chain Pollution Control, School of Ecology and Environment, Beijing Technology and Business University, Beijing 100048, China.
| | - Xinyu Yang
- State Environmental Protection Key Laboratory of Food Chain Pollution Control, School of Ecology and Environment, Beijing Technology and Business University, Beijing 100048, China
| | - Liya Zhao
- State Environmental Protection Key Laboratory of Food Chain Pollution Control, School of Ecology and Environment, Beijing Technology and Business University, Beijing 100048, China
| | - Lianhai Ren
- State Environmental Protection Key Laboratory of Food Chain Pollution Control, School of Ecology and Environment, Beijing Technology and Business University, Beijing 100048, China
| | - Ji Li
- Organic Recycling Institute (Suzhou) of China Agricultural University, Wuzhong District, Suzhou 215128, China; College of Resources and Environmental Science, Beijing Key Laboratory of Biodiversity and Organic Farming, China Agricultural University, Beijing 100193, China
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5
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Wang S, Xu C, Song L, Zhang J. Anaerobic Digestion of Food Waste and Its Microbial Consortia: A Historical Review and Future Perspectives. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:ijerph19159519. [PMID: 35954875 PMCID: PMC9367938 DOI: 10.3390/ijerph19159519] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/20/2022] [Revised: 07/25/2022] [Accepted: 07/27/2022] [Indexed: 02/04/2023]
Abstract
Renewable energy source, such as food waste (FW), has drawn great attention globally due to the energy crisis and the environmental problem. Anaerobic digestion (AD) mediated by novel microbial consortia is widely used to convert FW to clean energy. Despite of the considerable progress on food waste and FWAD optimization condition in recent years, a comprehensive and predictive understanding of FWAD microbial consortia is absent and therefore represents a major research challenge in FWAD. The review begins with a global view on the FWAD status and is followed by an overview of the role of AD key conditions’ association with microbial community variation during the three main energy substances (hydrogen, organic acids, and methane) production by FWAD. The following topic is the historical understanding of the FWAD microorganism through the development of molecular biotechnology, from classic strain isolation to low-throughput sequencing technologies, to high-throughput sequencing technologies, and to the combination of high-throughput sequencing and isotope tracing. Finally, the integration of multi-omics for better understanding of the microbial community activity and the synthetic biology for the manipulation of the functioning microbial consortia during the FWAD process are proposed. Understanding microbial consortia in FWAD helps us to better manage the global renewable energy source.
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Affiliation(s)
- Shuijing Wang
- School of Resources and Environmental Engineering, Anhui University, Hefei 230039, China;
| | - Chenming Xu
- College of Environment and Energy Engineering, Anhui Jianzhu University, Hefei 230601, China;
| | - Liyan Song
- School of Resources and Environmental Engineering, Anhui University, Hefei 230039, China;
- Correspondence: (L.S.); (J.Z.); Tel.: +86-55163861441 (L.S.); +86-55163828252 (J.Z.); Fax: +86-55163861724 (L.S.); +86-55163828252 (J.Z.)
| | - Jin Zhang
- College of Environment and Energy Engineering, Anhui Jianzhu University, Hefei 230601, China;
- Correspondence: (L.S.); (J.Z.); Tel.: +86-55163861441 (L.S.); +86-55163828252 (J.Z.); Fax: +86-55163861724 (L.S.); +86-55163828252 (J.Z.)
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Zhao S, Wu Y, Yao Y, Li J, Niu Q. Biochar assisted cellulose anaerobic digestion under the inhibition of dodecyl dimethyl benzyl ammonium chloride: Dose-response kinetic assays, performance variation, potential promotion mechanisms. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2022; 312:114934. [PMID: 35339793 DOI: 10.1016/j.jenvman.2022.114934] [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: 11/16/2021] [Revised: 03/16/2022] [Accepted: 03/17/2022] [Indexed: 06/14/2023]
Abstract
This study evaluated the inhibitory effect and mitigation strategy of dodecyl dimethyl benzyl ammonium chloride (DDBAC) suppression on anaerobic digestion. With the 12 h-suppression, only 16.64% of anaerobes were alive, and acetotrophic methanogens were significantly inhibited. As for batch test, DDBAC suppression significantly prolonged the start-up of systems and decreased the biogas production. In cellulose semi-continuous digestion process, the DDBAC suppression induced volatile fatty acids accumulation and pH decrease. However, the biochar amended reactor effectively mitigated the DDBAC suppression and achieved 370.5 mL/d·g-chemical-oxygen-demand biogas production. Moreover, 17.8% more protein in extracellular polymeric substances was secreted as the bio-barrier to defense the DDBAC suppression. Furthermore, microbial analysis showed that biochar addition selectively enriched directed interspecies electron transfer (DIET) participant bacteria (Anaerolineaceae and Syntrophomonas) and methanogens (Methanosaeta and Methanobacterium). Meanwhile, the potential metabolic pathway analysis showed that the abundance of amino acids and energy metabolism were increased 28% and 8%, respectively. The abundance of encoding enzyme related to hydrogenotrophic and acetotrophic methanogenesis enriched 1.88 times and 1.48 times, respectively. These results showed the performance and mechanisms involved in DIET establishment with ethanol stimulation biochar addition.
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Affiliation(s)
- Shunan Zhao
- School of Environmental Science and Engineering, China-America CRC for Environment & Health of Shandong Province, Shandong University, 72# Jimo Binhai Road, Qingdao, Shandong, 266237, China; School of Environment, Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, Tsinghua University, 30# Haidian Shuangqing Road, Beijing, 100084, China
| | - Yuehan Wu
- School of Environmental Science and Engineering, China-America CRC for Environment & Health of Shandong Province, Shandong University, 72# Jimo Binhai Road, Qingdao, Shandong, 266237, China
| | - Yilin Yao
- School of Environmental Science and Engineering, China-America CRC for Environment & Health of Shandong Province, Shandong University, 72# Jimo Binhai Road, Qingdao, Shandong, 266237, China
| | - Jingyi Li
- School of Environmental Science and Engineering, China-America CRC for Environment & Health of Shandong Province, Shandong University, 72# Jimo Binhai Road, Qingdao, Shandong, 266237, China
| | - Qigui Niu
- School of Environmental Science and Engineering, China-America CRC for Environment & Health of Shandong Province, Shandong University, 72# Jimo Binhai Road, Qingdao, Shandong, 266237, China.
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7
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Guo H, Zhao S, Xia D, Zhao W, Li Q, Liu X, Lv J. The biochemical mechanism of enhancing the conversion of chicken manure to biogenic methane using coal slime as additive. BIORESOURCE TECHNOLOGY 2022; 344:126226. [PMID: 34798250 DOI: 10.1016/j.biortech.2021.126226] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2021] [Revised: 10/22/2021] [Accepted: 10/23/2021] [Indexed: 06/13/2023]
Abstract
To improve the efficiency of methane production from chicken manure (CM) anaerobic digestion, the mechanism of coal slime (CS) as an additive on methane production characteristics were investigated. The results showed that adding an appropriate amount of CS quickened the start of the fermentation and effectively increased the methane yield. In addition, the pH changed in a stable manner in the liquid phase, and the concentrations of total ammonia nitrogen (TAN) and free ammonia nitrogen (FAN) were reduced. Moreover, organic matter was decomposed and volatile fatty acids (VFAs) were consumed effectively. The abundance of Bacteroides in the bacterial community and Methanosarcina in the archaea was increased. In addition, the reduction of CO2 was the main methanogenic pathway, and adding CS raised the abundance of genes for key enzymes in metabolic pathways during methane metabolism. The results provide a novel method for the efficient methane production from CM.
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Affiliation(s)
- Hongyu Guo
- School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China; Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region, Jiaozuo 454000, China
| | - Shufeng Zhao
- School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China
| | - Daping Xia
- School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China; Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region, Jiaozuo 454000, China.
| | - Weizhong Zhao
- Institute of Resources and Environment Henan Polytechnic University, Jiaozuo 454000, China
| | - Qingchao Li
- School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China
| | - XiaoLei Liu
- College of safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China
| | - Jinghui Lv
- College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454000, China
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8
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Jiménez-Ocampo UE, Vargas A, Moreno-Andrade I. Methane production from food waste using a feedback control strategy in a sequencing batch reactor. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2021; 84:1969-1980. [PMID: 34695024 DOI: 10.2166/wst.2021.370] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The performance of a feedback control strategy in the operation of a sequencing batch reactor was evaluated. This strategy uses the online biogas flow measurements to define the duration of the reaction phase of each operating cycle, thereby increasing the energy production of the system and maximizing the methane production rate. The reaction phase is ended when the biogas flow rate reaches a sustained value significantly lower value than the maximum flow rate achieved, as a consequence of the depletion of the soluble chemical oxygen demand. The implementation of the depletion-time control was successful and reached a maximum methane production rate of 1.22 L CH4/d, showing an average productivity of 0.73 ± 0.3 L CH4/d. The reaction phase varied from 1.2 to 6 days with hydraulic retention times from 6 to 30 days. The use of this feedback control strategy increased the methane production and the energy production in 80% of the evaluated cycles (from 10.4 to 43.8%) compared to the operation of conventional AD without a control strategy. Furthermore, the strategy is easy to implement since it does not require complex calculations and uses a readily available biogas flow rate sensor.
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Affiliation(s)
- U E Jiménez-Ocampo
- Laboratory for Research on Advanced Processes for Water Treatment, Unidad Académica Juriquilla, Instituto de Ingeniería, Universidad Nacional Autónoma de México, Blvd. Juriquilla 3001, 76230 Querétaro, México E-mail:
| | - A Vargas
- Laboratory for Research on Advanced Processes for Water Treatment, Unidad Académica Juriquilla, Instituto de Ingeniería, Universidad Nacional Autónoma de México, Blvd. Juriquilla 3001, 76230 Querétaro, México E-mail:
| | - I Moreno-Andrade
- Laboratory for Research on Advanced Processes for Water Treatment, Unidad Académica Juriquilla, Instituto de Ingeniería, Universidad Nacional Autónoma de México, Blvd. Juriquilla 3001, 76230 Querétaro, México E-mail:
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9
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Li X, Mo H, Zhou C, Ci Y, Wang J, Zang L. Nickel Foam Promotes Syntrophic Metabolism of Propionate and Butyrate in Anaerobic Digestion. ACS OMEGA 2021; 6:21033-21042. [PMID: 34423211 PMCID: PMC8375088 DOI: 10.1021/acsomega.1c02682] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2021] [Accepted: 07/26/2021] [Indexed: 05/16/2023]
Abstract
Enhanced interspecies electron transfer (IET) among symbiotic microorganisms is an effective method to increase the rate of methane (CH4) production in anaerobic digestion. Direct interspecies electron transfer (DIET), which does not involve dissolved redox media, is considered an alternative and superior method to enhance methane production by interspecific hydrogen (H2) transfer (IHT). In this study, nickel foam was built into a semicontinuous anaerobic reactor to investigate its effect on the metabolism of propionate and butyrate. Both increased the average yield of CH4 in anaerobic digestion by 18.1 and 15.9%, respectively. Analysis of bacterial and archaeal communities showed that the addition of nickel foam could increase the relative abundance of microbial communities involved in DIET and could increase the diversity of microorganisms in the reactor. Moreover, the anaerobic digestion performance of the nickel foam reactor was good at high hydrogen partial pressure.
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Affiliation(s)
- Xueyuan Li
- College
of Environmental Science and Engineering, Qilu University of Technology (Shandong Academy of Science), Jinan 250353, China
| | - Haoe Mo
- College
of Environmental Science and Engineering, Qilu University of Technology (Shandong Academy of Science), Jinan 250353, China
| | - Chengxuan Zhou
- College
of Environmental Science and Engineering, Qilu University of Technology (Shandong Academy of Science), Jinan 250353, China
| | - Yuhui Ci
- College
of Environmental Science and Engineering, Qilu University of Technology (Shandong Academy of Science), Jinan 250353, China
| | - Jinwei Wang
- Weifang
yingxuan Industry Co., Ltd., Weifang 262499, China
| | - Lihua Zang
- College
of Environmental Science and Engineering, Qilu University of Technology (Shandong Academy of Science), Jinan 250353, China
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10
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Guo H, Zhao S, Xia D, Wang L, Lv J, Yu H, Jiao X. Efficient utilization of coal slime using anaerobic fermentation technology. BIORESOURCE TECHNOLOGY 2021; 332:125072. [PMID: 33826981 DOI: 10.1016/j.biortech.2021.125072] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2021] [Revised: 03/23/2021] [Accepted: 03/24/2021] [Indexed: 06/12/2023]
Abstract
In order to increase the utilization of coal slime, realize efficient utilization of resources and protect the environment, the feasibility of anaerobic fermentation technology employing coal slime was explored. The biodegradation of coal slimes and its influence on the utilization characteristics were analyzed using biogas production simulations, drying dehydration and thermogravimetric (TG) analysis. The results showed that the organic matter in various coal slimes could be converted to biomethane. In addition, the main methanogenic pathway was the reduction of CO2. Moreover, lower the metamorphic degree of coal slimes and higher the ash content, more conducive were they to the dehydration of coal slimes. After biodegradation, the temperatures of four coal slimes during the stages of release of moisture, volatile combustion, residual coke combustion and burnout advanced to varying degrees. Moreover, the combustion performance improved. The research results provided a novel idea for the efficient utilization of coal slime.
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Affiliation(s)
- Hongyu Guo
- School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China; Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region, Jiaozuo 454000, China
| | - Shufeng Zhao
- School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China
| | - Daping Xia
- School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China.
| | - Lei Wang
- Shanxi Daping Coal Industry Limited Company, Changzhi 046600, China
| | - Jinghui Lv
- College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454000, China
| | - Hongfei Yu
- Institute of Resources and Environment Henan Polytechnic University, Jiaozuo 454000, China
| | - Xiaojian Jiao
- School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China; Industrial Technology Research Institute Co, Ltd, Henan Polytechnic University, Jiaozuo 454000, China
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11
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Ma X, Yu M, Yang M, Zhang S, Gao M, Wu C, Wang Q. Effect of liquid digestate recirculation on the ethanol-type two-phase semi-continuous anaerobic digestion system of food waste. BIORESOURCE TECHNOLOGY 2020; 313:123534. [PMID: 32540691 DOI: 10.1016/j.biortech.2020.123534] [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: 03/31/2020] [Revised: 05/09/2020] [Accepted: 05/12/2020] [Indexed: 06/11/2023]
Abstract
This study set up four groups for semi-continuous 150-days experiment to explore the effect of liquid digestate recirculation on the food waste ethanol-type anaerobic digestion system. Results showed that this operation improved the maximum organic load rates to 6.0 g-VS·L-1·d-1, and increased the average alkalinity of methanogenic phase under high load condition by 1.3 times. Total volatile fatty acids/total alkalinity (threshold value was approximately 0.5) could be used as an early warning indicator of methanogenic phase instability. Besides, approximately 64.5% of bacterial species in the hydrolysed acidified phase of ethanol-type liquid digestate recirculation group originated from the recirculated liquid digestate, which enriched the diversity of microbial community, thereby improving the hydrolysis acidification efficiency. Therefore, liquid digestate recirculation improved the stability of system in terms of alkalinity and microecology and then increased the maximum organic load rates.
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Affiliation(s)
- Xinxin Ma
- Department of Environmental Engineering, School of Energy and Environmental Engineering, Beijing Key Laboratory on Disposal and Resource Recovery of Industry Typical Pollutants, University of Science and Technology Beijing, Beijing 100083, PR China
| | - Miao Yu
- Department of Environmental Engineering, School of Energy and Environmental Engineering, Beijing Key Laboratory on Disposal and Resource Recovery of Industry Typical Pollutants, University of Science and Technology Beijing, Beijing 100083, PR China
| | - Min Yang
- Department of Environmental Engineering, School of Energy and Environmental Engineering, Beijing Key Laboratory on Disposal and Resource Recovery of Industry Typical Pollutants, University of Science and Technology Beijing, Beijing 100083, PR China
| | - Shuang Zhang
- Department of Environmental Engineering, School of Energy and Environmental Engineering, Beijing Key Laboratory on Disposal and Resource Recovery of Industry Typical Pollutants, University of Science and Technology Beijing, Beijing 100083, PR China
| | - Ming Gao
- Department of Environmental Engineering, School of Energy and Environmental Engineering, Beijing Key Laboratory on Disposal and Resource Recovery of Industry Typical Pollutants, University of Science and Technology Beijing, Beijing 100083, PR China
| | - Chuanfu Wu
- Department of Environmental Engineering, School of Energy and Environmental Engineering, Beijing Key Laboratory on Disposal and Resource Recovery of Industry Typical Pollutants, University of Science and Technology Beijing, Beijing 100083, PR China.
| | - Qunhui Wang
- Department of Environmental Engineering, School of Energy and Environmental Engineering, Beijing Key Laboratory on Disposal and Resource Recovery of Industry Typical Pollutants, University of Science and Technology Beijing, Beijing 100083, PR China; Tianjin College, University of Science and Technology Beijing, Tianjin 301830, PR China
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