1
|
Chen B, Azman S, Crauwels S, Dewil R, Appels L. Mild alkaline conditions affect digester performance and community dynamics during long-term exposure. BIORESOURCE TECHNOLOGY 2024; 406:131009. [PMID: 38909869 DOI: 10.1016/j.biortech.2024.131009] [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: 02/09/2024] [Revised: 06/06/2024] [Accepted: 06/16/2024] [Indexed: 06/25/2024]
Abstract
This paper examines the adaptive responses of microbial communities to gradual shifts in pH toward the mild alkaline range in anaerobic digestion (AD) systems. The results indicate that a pH of 8.0 serves as a critical upper limit for stable AD operation, beyond which microbial efficiency declines, underscoring the importance of microbial resilience against elevated pH stress. Specifically, hydrolysis genera, e.g. Eubacterium and Anaerobacterium, and syntrophic bacteria were crucial for reactor stability. Fibrobacter had also been shown to play a key role in the accumulation of propionate, thus leading to its dominance in the volatile fatty acid profile throughout the experimental phases. Overall, this investigation revealed the potential adaptability of microbial communities in AD systems to mild alkaline pH shifts, emphasizing the hydrolysis bacteria and syntrophic bacteria as key factors for maintaining metabolic function in elevated pH conditions.
Collapse
Affiliation(s)
- Boyang Chen
- KU Leuven, Department of Chemical Engineering, Process and Environmental Technology Lab, Jan Pieter De Nayerlaan 5, B-2860 Sint-Katelijne-Waver, Belgium
| | - Samet Azman
- Avans University of Applied Sciences, Academy of Life Sciences and Technology, Lovensdijk 61, 4818 AJ Breda, Netherlands
| | - Sam Crauwels
- KU Leuven, Department of Microbial and Molecular Systems (M(2)S), Centre of Microbial and Plant Genetics, Willem de Croylaan 46, 3001 Leuven, Belgium
| | - Raf Dewil
- KU Leuven, Department of Chemical Engineering, Process and Environmental Technology Lab, Jan Pieter De Nayerlaan 5, B-2860 Sint-Katelijne-Waver, Belgium
| | - Lise Appels
- KU Leuven, Department of Chemical Engineering, Process and Environmental Technology Lab, Jan Pieter De Nayerlaan 5, B-2860 Sint-Katelijne-Waver, Belgium.
| |
Collapse
|
2
|
Wang J, Xu C, Zhang W, Hong Y, Shen G, Wang W, Tang H, Zhang S, Pan J, Wang W. Synergistic effect of two bacterial strains promoting anaerobic digestion of rice straw to produce methane. ENVIRONMENTAL RESEARCH 2024; 252:118974. [PMID: 38649016 DOI: 10.1016/j.envres.2024.118974] [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: 01/29/2024] [Revised: 04/12/2024] [Accepted: 04/18/2024] [Indexed: 04/25/2024]
Abstract
A large amount of agricultural waste causes global environmental pollution. Biogas production by microbial pretreatment is an important way to utilize agricultural waste resources. In this study, Sporocytophaga CG-1 (A, cellulolytic strain) was co-cultured with Bacillus clausii HP-1 (B, non-cellulolytic strain) to analyze the effect of pretreatment of rice straw on methanogenic capacity of anaerobic digestion (AD). The results showed that weight loss rate of filter paper of co-culture combination is 53.38%, which is 29.37% higher than that of A. The synergistic effect of B on A can promote its degradation of cellulose. The cumulative methane production rate of the co-culture combination was the highest (93.04 mL/g VS substrate), which was significantly higher than that of A, B and the control group (82.38, 67.28 and 67.70 mL/g VS substrate). Auxiliary bacteria can improve cellulose degradation rate by promoting secondary product metabolism. These results provide data support for the application of co-culture strategies in the field of anaerobic digestion practices.
Collapse
Affiliation(s)
- Jinghong Wang
- Key Laboratory of Low -Carbon Green Agriculture in Northeast China, Ministry of Agriculture and Rural Affairs, College of Agronomy, Heilongjiang Bayi Agricultural University, Daqing, 163319, PR China; College of Life Science and Biotechnology, Heilongjiang Bayi Agricultural University, Daqing, 163319, PR China
| | - Congfeng Xu
- Key Laboratory of Low -Carbon Green Agriculture in Northeast China, Ministry of Agriculture and Rural Affairs, College of Agronomy, Heilongjiang Bayi Agricultural University, Daqing, 163319, PR China; College of Life Science and Biotechnology, Heilongjiang Bayi Agricultural University, Daqing, 163319, PR China
| | - Wei Zhang
- Key Laboratory of Low -Carbon Green Agriculture in Northeast China, Ministry of Agriculture and Rural Affairs, College of Agronomy, Heilongjiang Bayi Agricultural University, Daqing, 163319, PR China
| | - Yanhua Hong
- Key Laboratory of Low -Carbon Green Agriculture in Northeast China, Ministry of Agriculture and Rural Affairs, College of Agronomy, Heilongjiang Bayi Agricultural University, Daqing, 163319, PR China
| | - Guinan Shen
- College of Life Science and Biotechnology, Heilongjiang Bayi Agricultural University, Daqing, 163319, PR China
| | - Weiwei Wang
- State Key Laboratory of Microbial Metabolism, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240, PR China
| | - Hongzhi Tang
- State Key Laboratory of Microbial Metabolism, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240, PR China
| | - Shenglong Zhang
- College of Life Science and Biotechnology, Heilongjiang Bayi Agricultural University, Daqing, 163319, PR China; Heilongjiang Guohong Environmental Co., LTD, Harbin, 150028, PR China
| | - Junting Pan
- Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, 100081, PR China
| | - Weidong Wang
- Key Laboratory of Low -Carbon Green Agriculture in Northeast China, Ministry of Agriculture and Rural Affairs, College of Agronomy, Heilongjiang Bayi Agricultural University, Daqing, 163319, PR China; College of Life Science, Northeast Forestry University, Harbin, 150040, PR China; College of Life Science and Biotechnology, Heilongjiang Bayi Agricultural University, Daqing, 163319, PR China.
| |
Collapse
|
3
|
Thongbunrod N, Chaiprasert P. Efficient methane production from agro-industrial residues using anaerobic fungal-rich consortia. World J Microbiol Biotechnol 2024; 40:239. [PMID: 38862848 DOI: 10.1007/s11274-024-04050-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2024] [Accepted: 06/09/2024] [Indexed: 06/13/2024]
Abstract
Anaerobic digestion (AD) emerges as a pivotal technique in climate change mitigation, transforming organic materials into biogas, a renewable energy form. This process significantly impacts energy production and waste management, influencing greenhouse gas emissions. Traditional research has largely focused on anaerobic bacteria and methanogens for methane production. However, the potential of anaerobic lignocellulolytic fungi for degrading lignocellulosic biomass remains less explored. In this study, buffalo rumen inocula were enriched and acclimatized to improve lignocellulolytic hydrolysis activity. Two consortia were established: the anaerobic fungi consortium (AFC), selectively enriched for fungi, and the anaerobic lignocellulolytic microbial consortium (ALMC). The consortia were utilized to create five distinct microbial cocktails-AF0, AF20, AF50, AF80, and AF100. These cocktails were formulated based on varying of AFC and ALMC by weights (w/w). Methane production from each cocktail of lignocellulosic biomasses (cassava pulp and oil palm residues) was evaluated. The highest methane yields of CP, EFB, and MFB were obtained at 337, 215, and 54 mL/g VS, respectively. Cocktails containing a mix of anaerobic fungi, hydrolytic bacteria (Sphingobacterium sp.), syntrophic bacteria (Sphaerochaeta sp.), and hydrogenotrophic methanogens produced 2.1-2.6 times higher methane in cassava pulp and 1.1-1.2 times in oil palm empty fruit bunch compared to AF0. All cocktails effectively produced methane from oil palm empty fruit bunch due to its lipid content. However, methane production ceased after 3 days when oil palm mesocarp fiber was used, due to long-chain fatty acid accumulation. Anaerobic fungi consortia showed effective lignocellulosic and starchy biomass degradation without inhibition due to organic acid accumulation. These findings underscore the potential of tailored microbial cocktails for enhancing methane production from diverse lignocellulosic substrates.
Collapse
Affiliation(s)
- Nitiya Thongbunrod
- Biotechnology Program, School of Bioresources and Technology, King Mongkut's University of Technology Thonburi, Bangkok, 10150, Thailand
| | - Pawinee Chaiprasert
- Biotechnology Program, School of Bioresources and Technology, King Mongkut's University of Technology Thonburi, Bangkok, 10150, Thailand.
| |
Collapse
|
4
|
Kriswantoro JA, Pan KY, Chu CY. Co-digestion approach for enhancement of biogas production by mixture of untreated napier grass and industrial hydrolyzed food waste. Front Bioeng Biotechnol 2024; 11:1269727. [PMID: 38260741 PMCID: PMC10801417 DOI: 10.3389/fbioe.2023.1269727] [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: 07/30/2023] [Accepted: 12/20/2023] [Indexed: 01/24/2024] Open
Abstract
The co-digestion of untreated Napier grass (NG) and industrial hydrolyzed food waste (FW) was carried out in the batch reactor to investigate the effect of substrate ratios on biogas production performance. Two-stage anaerobic digestion was performed with an initial substrate concentration of 5 g VSadded/L and a Food to Microorganism Ratio (F/M) of 0.84. The 1:1 ratio of the NG and FW showed the optimum performances on biogas production yield with a value of 1,161.33 mL/g VSadded after 60 days of digestion. This was followed by the data on methane yield and concentration were 614.37 mL/g VSadded and 67.29%, respectively. The results were similar to the simulation results using a modified Gompertz model, which had a higher potential methane production and maximum production rate, as well as a shorter lag phase and a coefficient of determination of 0.9945. These findings indicated that the co-digestion of Napier grass and hydrolyzed food waste can enhance biogas production in two-stage anaerobic digestion.
Collapse
Affiliation(s)
- Jayen Aris Kriswantoro
- Ph.D. Program of Mechanical and Aeronautical Engineering, Feng Chia University, Taichung, Taiwan
- Institute of Green Products, Feng Chia University, Taichung, Taiwan
- School of Life Sciences and Technology, Bandung Institute of Technology, Bandung, Indonesia
| | - Kuan-Yin Pan
- Institute of Green Products, Feng Chia University, Taichung, Taiwan
- Department of Materials Science and Engineering, College of Engineering and Science, Feng Chia University, Taichung, Taiwan
| | - Chen-Yeon Chu
- Ph.D. Program of Mechanical and Aeronautical Engineering, Feng Chia University, Taichung, Taiwan
- Institute of Green Products, Feng Chia University, Taichung, Taiwan
- National Research Council of Italy, Institute of Atmospheric Pollution Research, Rome, Italy
| |
Collapse
|