Article
Environmental Sciences
Huan Liu, Xuan Li, Zehao Zhang, Long D. Nghiem, Qilin Wang
Summary: Urine pretreatment is an effective strategy to improve methane production in anaerobic digestion of waste activated sludge, with significant increases in methane production, degradation extent, and hydrolysis rate.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Green & Sustainable Science & Technology
Afsane Sedighi, Mohsen Karrabi, Bahar Shahnavaz, Morteza Mostafavinezhad
Summary: This study investigated the potential for biogas production from anaerobic codigestion of the organic fraction of municipal solid waste and sewage sludge under mesophilic conditions. The results showed that the best outputs were achieved at TS = 5% and ISR = 2, with the highest biogas yield and methane production.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2022)
Article
Environmental Sciences
Zhiren Cao, Xiaoding Huang, You Wu, Dongbo Wang, Wenjie Du, Jiamin Zhang, Qi Yang, Zhe Kuang, Zhuo Chen, Xiaoming Li
Summary: This study investigated the effect of AHTN on waste activated sludge anaerobic digestion, finding that AHTN can enhance methane production up to a certain concentration, but decrease it when reaching a certain threshold. Additionally, AHTN can facilitate the utilization of volatile fatty acids, with a degradation efficiency of 42.7%. Mechanism investigation showed that AHTN can promote solubilization, fermentation, and methanogenesis processes, leading to increased methane production.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Engineering, Environmental
Hongbo Chen, Mengge Tang, Xiao Yang, Yiu Fai Tsang, Yanxin Wu, Dongbo Wang, Yaoyu Zhou
Summary: The study identifies the key role of Polyamide 6 (PA6) microplastics in enhancing methane production during anaerobic digestion, with a significant increase in methane production due to the presence of caprolactam (CPL). PA6 has a less toxic effect compared to other microplastics on waste activated sludge (WAS) anaerobic digestion, and it promotes key enzyme activities leading to increased methane production potential and volatile solids destruction.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Environmental
Qiuxiang Xu, Tian-Yi Luo, Ruo-Lan Wu, Wei Wei, Jing Sun, Xiaohu Dai, Bing-Jie Ni
Summary: The study demonstrates that rhamnolipid (RL) pretreatment has a promoting effect on methane production in two-phase anaerobic digestion of waste activated sludge, although methane production may be inhibited in the presence of RL during the acidogenic phase. Further analysis shows that the addition of RL can increase methane production throughout the entire two-phase anaerobic digestion process.
Article
Green & Sustainable Science & Technology
Yuqi Wu, Kang Song
Summary: The study on anaerobic co-digestion of waste activated sludge and fish waste showed that adding 1.5% and 3% of fish waste could enhance methane production, while adding more than 6% inhibited methane production severely. Microbial community analysis revealed dominance of hydrogenotrophic and methylotrophic methanogenesis pathways during anaerobic co-digestion.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Environmental Sciences
Kai Feng, Luxin Yang, Liang Chen, Qi Jing, Huan Li, Debin Li, Jiayi Liu, Jiabai Cai, Zhou Deng
Summary: This paper proposes a method of anaerobic co-digestion of food waste and sludge to enhance their methane potential. The methane yield of this co-digestion is higher compared to the co-digestion of sludge with food waste. The addition of thermally hydrolyzed sludge weakens the synergistic effect, while the addition of THS filtrate enhances it.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Agricultural Engineering
Yufen Wang, Kaixin Zheng, Haixiao Guo, Yindong Tong, Tingting Zhu, Yiwen Liu
Summary: This study revealed that vivianite significantly inhibits anaerobic digestion of waste activated sludge, leading to a decrease in methane yield, an increase in substrate remaining, and an impact on microbial communities.
BIORESOURCE TECHNOLOGY
(2022)
Article
Environmental Sciences
Shu-Lin Wu, Wei Wei, Bing-Jie Ni
Summary: A novel sludge pretreatment technology using calcium hypochlorite (Ca(ClO)2) to enhance methane production from waste activated sludge (WAS) anaerobic digestion was reported. The results showed that appropriate doses of Ca(ClO)2 significantly increased the solubilization of WAS and methane production, while negatively affecting the microbial community composition and inhibiting microbial processes related to methane production.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Agricultural Engineering
Yu Qin, Jingnan Yang, Yanxin Wu, Dongbo Wang, Xuran Liu, Mingting Du, Dandan He, Neng Yi
Summary: This study found that allyl isothiocyanate (AITC) from cruciferous vegetables can be completely degraded by microorganisms during anaerobic co-digestion, serving as a substrate for methane production. Increasing AITC concentration led to decreased methane production and prolonged digestion time. AITC also induced cell apoptosis by modifying cell membrane properties, inhibiting the anaerobic co-digestion process.
BIORESOURCE TECHNOLOGY
(2022)
Article
Agricultural Engineering
Mengyu Yin, Hongbo Chen
Summary: Chitosan plays a positive role in anaerobic digestion of waste activated sludge, enhancing methane production potential and promoting sludge agglomeration through various mechanisms, ultimately contributing to the gasification process.
BIORESOURCE TECHNOLOGY
(2022)
Article
Environmental Sciences
Mingze Shi, Hongbo Liu, Xuedong Zhang, Yajie Li, Fang Huang, Cheng Zhao, Jun Guo, Ping Wu, He Liu
Summary: The concentration and chemical structure of FAs undergo significant changes during sludge thermal hydrolysis, promoting the anaerobic digestion of sludge. The evolutions of FAs have differential influences on different phases of sludge AD, being promotional to acidogenesis and methanogenesis but inhibitory to hydrolysis.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Agricultural Engineering
Cong-Cong Tang, Bao-Cai Zhang, Xing-Ye Yao, Ai-Juan Zhou, Wenzong Liu, Yong-Xiang Ren, Zhihua Li, Aijie Wang, Zhang-Wei He
Summary: This study investigated the response mechanisms of anaerobic digestion of waste activated sludge to different particle sizes of zeolite. It was found that zeolite with a particle size of 0.2-0.5 mm and an additive dosage of 0.1 g/g VSS increased methane production by 22.08% compared to the control. Mechanism study revealed that zeolite improved the hydrolysis, acidification, and methanogenesis stages, leading to the enhanced consumption of soluble polysaccharides and proteins, increased accumulation of short-chain fatty acids, optimized composition of short-chain fatty acids, increased activity of F420, and promoted syntrophic metabolism between bacteria and methanogens.
BIORESOURCE TECHNOLOGY
(2023)
Article
Engineering, Environmental
Kaihao Hou, Xi Luo, Muxiang Liang, Xiaoming Liu, Qi Xu, Jing Chen, Xiejuan Lu, Xiaohui Wu, Feixiang Zan
Summary: Waste activated sludge pretreatment with sulfite and heat can effectively improve sludge hydrolysis rate and methane production. By combining sulfite and heat pretreatment, soluble substances and methane production can be significantly enhanced. The HESP method shows promise in enhancing methane production and promoting methanogenic metabolism, but further experimentation is needed for specific conditions.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
Article
Engineering, Environmental
Khaliyah Sani, Rattana Jariyaboon, Sompong O-Thong, Benjamas Cheirsilp, Prasad Kaparaju, Yi Wang, Prawit Kongjan
Summary: This study attempted to co-digest waste-activated sludge (WAS) and greasy sludge (GS) using a two-stage anaerobic digestion process. The results showed that this process was effective in stabilizing the waste and generating valuable bioenergy carriers.