Review
Biotechnology & Applied Microbiology
Dong Feng, Xiaobo Guo, Richen Lin, Ao Xia, Yun Huang, Qiang Liao, Xianqing Zhu, Xun Zhu, Jerry D. Murphy
Summary: AD of organic waste to produce biogas is a mature biotechnology, but recent discovery of DIET using ethanol as a stimulant has shown potential to significantly improve efficiency. Ethanol as an electron donor in AD can enhance yields and rates of biogas production through DIET pathways. Different strategies involving ethanol-based DIET in AD have been discussed to suggest pathways for improved performance.
BIOTECHNOLOGY ADVANCES
(2021)
Article
Agricultural Engineering
Takuro Kobayashi, Hidetoshi Kuramochi
Summary: An optimized biochar production procedure was developed to stimulate palmitic acid biodegradation, and it was found that K2CO3-activated biochar significantly increased its electrical conductivity and improved wettability, resulting in a 1.3 times higher methane production rate.
BIORESOURCE TECHNOLOGY
(2022)
Article
Environmental Sciences
Junyi Ma, Zonglu Yao, Lixin Zhao
Summary: This study investigates the feasibility of using a combination of biochar and micron-magnetite to alleviate the negative impact of long-chain fatty acids on anaerobic digestion. The results show that this combination can increase methane production and accelerate organic carbon degradation by stimulating changes in bacterial communities and the secretion of extracellular substances.
ENVIRONMENTAL RESEARCH
(2023)
Article
Engineering, Environmental
Mingwei Wang, Tengfei Ren, Mengxi Yin, Kechao Lu, Hui Xu, Xia Huang, Xiaoyuan Zhang
Summary: In this study, a binary electroactive material with pseudocapacitance/conductance was designed to store-release electrons and enhance direct electron transfer between acid-producing bacteria and methanogens in anaerobic wastewater treatment. The pseudocapacitance of the material promoted ATP synthesis and provided energy for organic decomposition, while the conductance facilitated direct interspecies electron transfer and improved methane production. The material also helped buffer excess electrons and alleviate pH drop. These findings provide a strategy to enhance electron transfer in anaerobic treatment and guide the design of electroactive materials.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Lujun Wang, Qilin Yu, Cheng Sun, Yahui Zhu, Zhenxin Wang, Yaobin Zhang
Summary: Intermittent voltage supply was found to enhance the performance of electro-assisted anaerobic digestion, and the mechanism behind this improvement was analyzed. Methane yield and organic decomposition of the sludge increased under intermittent voltage, along with an improvement in electron transfer.
Review
Agricultural Engineering
Roent Dune A. Dune, Gi-Beom Kim, Jungsu Park, Yung-Hun Yang, Byong-Hun Jeon, Min Jang, Sang-Hyoun Kim
Summary: The efficiency of anaerobic digestion can be enhanced by promoting microbial retention through biofilm development using specific types of biofilm carriers. Different carrier materials can influence the dynamicity of microbial populations in each system, and improving surface contact and interspecies electron transport can greatly impact treatment results. Modern spectroscopy techniques provide valuable information on biofilm composition and structure, aiding in understanding the added function of this special layer of microbial cells.
BIORESOURCE TECHNOLOGY
(2022)
Article
Green & Sustainable Science & Technology
Jianfeng Wang, Zhiqiang Zhao, Yaobin Zhang
Summary: This study found that optimizing the pyrolytic temperature of biochar to form more redox-active organic functional groups can improve the anaerobic digestion performance of kitchen wastes.
Article
Environmental Sciences
Xi Qin, Xueqin Lu, Teng Cai, Chengxin Niu, Yule Han, Zhongyi Zhang, Xuefeng Zhu, Guangyin Zhen
Summary: The study demonstrated that magnetite-enhanced bioelectrochemical stimulation can increase methane production from waste activated sludge, with the M-MEC-AD system showing the best performance. The bioelectrochemical stimulation enriched electroactive Geobacter and classical methanogens, while the integration of magnetite facilitated interspecies electron transfer, improving energy efficiency.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Zhi-Man Yang, Rong-Bo Guo, Xiao-Huan Dong
Summary: This study investigates the enhancement of biomethane production using a composite material consisting of Fe2O3 nanoparticles decorated on carbon nanotubes. The results show that the addition of Fe2O3@CNTs significantly improves the methane production rate and exhibits good electrochemical response and electron transfer capability.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Agricultural Engineering
Zhang-Wei He, Hong-Yu Jin, Yong-Xiang Ren, Wen-Jing Yang, Cong-Cong Tang, Chun-Xue Yang, Ai-Juan Zhou, Wen-Zong Liu, Ai-Jie Wang
Summary: This study proposed a promising approach, stepwise alkaline treatment coupled with ammonia stripping, to enhance short-chain fatty acids (SCFAs) production from waste activated sludge (WAS) anaerobic digestion. The strategy not only increased SCFAs production significantly, but also achieved nitrogen and carbon recovery, offering solutions for the carbon-neutral operation of wastewater treatment plants.
BIORESOURCE TECHNOLOGY
(2021)
Review
Engineering, Environmental
Ting Liang, Khaled Elmaadawy, Bingchuan Liu, Jingping Hu, Huijie Hou, Jiakuan Yang
Summary: This study provides an overview of the recent advancements in volatile fatty acids production from waste activated sludge. Factors affecting VFAs production including sludge properties, metabolic pathways, and pretreatment methods were evaluated. It was found that additives and pretreatment are energetically preferred for accelerating VFAs accumulation, while different structures of humic substances may have varying effects on the fermentation process and VFAs production.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2021)
Article
Engineering, Environmental
Bikash R. Tiwari, Tarek Rouissi, Satinder Kaur Brar, Rao Y. Surampalli
Summary: Anaerobic digestion (AD) at low temperatures has attracted attention for its ability to overcome the adverse effects of cold on microbial biology and wastewater properties. Reduction in organic loading rate and modification in reactor design can improve methane production. Novel strategies such as DIET and co-digestion show promising prospects for future development in psychrophilic AD.
Article
Agricultural Engineering
Prativa Mahato, Rajinikanth Rajagopal, Bernard Goyette, Suman Adhikary
Summary: This study investigates the technical feasibility of low-temperature, closed-loop two-stage anaerobic digesters for treating chicken manure as the sole feedstock. The results show that this technology can efficiently and stably produce methane with economic benefits.
BIORESOURCE TECHNOLOGY
(2022)
Article
Energy & Fuels
Chen Deng, Richen Lin, Xihui Kang, Benteng Wu, David M. Wall, Jerry D. Murphy
Summary: This study investigated the effects of biochar properties on enhancing interspecies electron transfer in anaerobic digestion (AD). Results showed that biochar produced at 700 degrees C significantly increased biomethane yield, while biochars produced at 500 and 900 degrees C did not show the same effect. The addition of biochar at 700 degrees C enriched the methanogen Methanosarcina, suggesting a shift towards direct interspecies electron transfer (DIET) pathway. Moderate graphitization degree and abundant active surface functional groups were found to be correlated with enhanced interspecies electron transfer through carbon matrices and surface functional groups.
Review
Biotechnology & Applied Microbiology
Kai Su, Linxiao Li, Qin Wang, Rong Cao
Summary: Anaerobic methanogenesis plays a crucial role in managing high concentration organic wastewater and recovering bioenergy sustainably. Interspecies electron transfer (IET) is a novel mutualistic symbiosis that can enhance microbial metabolism and overcome thermodynamic barriers, thus facilitating anaerobic methanogenesis. IET can be categorized into Direct Interspecies Electron Transfer (DIET) and Mediated Interspecies Electron Transfer (MIET) based on different electron transfer methods. This paper reviews the recent advancements in interspecies microbial electron transfer in anaerobic methanogenic systems, explains the possible mechanisms of DIET and MIET, and analyzes the differences in methanogenic performance, thermodynamics, kinetics, and microbial communities involved between DIET and MIET methods. Ultimately, it was discovered that DIET can enhance extracellular electron transfer, alleviate inhibition caused by high organic loading rate, organic acids, and toxic substances, assist fermentative bacteria, and enable efficient degradation of complex organic matter during anaerobic methanogenesis. This overcomes issues such as low electron transfer efficiency and acidification in traditional anaerobic digestion.
FERMENTATION-BASEL
(2023)
Article
Chemistry, Multidisciplinary
Sung T. Oh, Alastair Martin
JOURNAL OF CO2 UTILIZATION
(2016)
Article
Engineering, Environmental
Sung T. Oh, Alastair Martin, Soo-Jung Kang
CHEMICAL ENGINEERING JOURNAL
(2018)
Review
Biotechnology & Applied Microbiology
Sung T. Oh, Jung Rae Kim, Giuliano C. Premier, Tae Ho Lee, Changwon Kim, William T. Sloan
BIOTECHNOLOGY ADVANCES
(2010)
Article
Engineering, Environmental
Sung T. Oh, Alastair D. Martin
CHEMICAL ENGINEERING JOURNAL
(2014)
Article
Engineering, Environmental
Sung T. Oh, Alastair D. Martin
CHEMICAL ENGINEERING JOURNAL
(2014)
Review
Engineering, Environmental
Sung T. Oh, Soo-Jung Kang, Aqil Azizi
CHEMICAL ENGINEERING JOURNAL
(2018)
Article
Biotechnology & Applied Microbiology
Sung T. Oh, Alastair D. Martin
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
(2013)
Meeting Abstract
Chemistry, Multidisciplinary
Jaehwan Cha, Sung T. Oh, Soojung Choi, Changwon Kim
ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
(2011)
Article
Biotechnology & Applied Microbiology
Sung T. Oh, Alastair D. Martin
BIOCHEMICAL ENGINEERING JOURNAL
(2007)