Review
Agricultural Engineering
Siran Feng, Huu Hao Ngo, Wenshan Guo, Soon Woong Chang, Dinh Duc Nguyen, Yi Liu, Shicheng Zhang, Hoang Nhat Phong Vo, Xuan Thanh Bui, Bich Ngoc Hoang
Summary: This review provides an overview of the roles and applications of enzymes in volatile fatty acids production, as well as feasible measures to enhance enzyme processes. It critically evaluates the major obstacles and possible future research directions for the better utilization of enzymatic processes in promoting volatile fatty acids production from wastewater.
BIORESOURCE TECHNOLOGY
(2022)
Article
Agricultural Engineering
Yanan Yin, Tao Zhang, Shijun He, Jianlong Wang
Summary: This study demonstrated that combining thermal pretreatment and anaerobic fermentation can effectively enhance erythromycin removal from fermentation residues, indicating a promising approach for the treatment of erythromycin waste.
BIORESOURCE TECHNOLOGY
(2023)
Article
Agricultural Engineering
Qi Lu, Mingting Du, Qing Xu, Xunkuo Zhang, Xuran Liu, Guojing Yang, Dongbo Wang
Summary: The study developed a sulfite-based pretreatment method to enhance the production of VFAs from anaerobic fermentation of microalgae. The pretreatment released more easily biodegradable organics, destroyed the cell wall of microalgae, and facilitated the acetate generation pathway.
BIORESOURCE TECHNOLOGY
(2022)
Review
Environmental Sciences
Ashutosh Kumar Pandey, S. Pilli, P. Bhunia, R. D. Tyagi, Y. Rao Surampalli, C. Tian Zhang, Sang-Hyoun Kim, Ashok Pandey
Summary: VFAs are the building blocks of the chemical industry and play a key role in the planet's organic carbon cycle. To address the issues of unsustainable VFA production from fossil fuels, it is crucial to develop alternate sources through anaerobic digestion. By researching accessible feedstocks, influencing parameters, and utilizing VFAs to create consumer products, economic stability can be achieved through traditional and advanced production methods.
Article
Ecology
Tao Wang, Bin Kuang, Zhili Ni, Bing Guo, Yuying Li, Gefu Zhu
Summary: This study co-cultured S. wolfei and G. sulfurreducens in a bio-electrochemical system and quantitatively described the degradation characteristics of butyric acid. The results showed that the presence of G. sulfurreducens enhanced the consumption of H-2 and acetic acid through direct interspecies electron transfer, thereby enhancing the degradation of butyric acid through a co-metabolic process.
Article
Engineering, Chemical
Na Zhang, Chenxu Wu, Juntian Zhang, Shuang Han, Yongzhen Peng, Xiaoye Song
Summary: This study investigated the resistance of anaerobic membrane bioreactor (AnMBR) to lipid gradients during food wastewater treatment. The results showed that AnMBR could adapt to a certain content of lipids by stimulating biomass growth and activity. However, a further increase in lipid dosage led to system failure and inhibited methane production.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Review
Agricultural Engineering
Alok Patel, Omprakash Sarkar, Ulrika Rova, Paul Christakopoulos, Leonidas Matsakas
Summary: Volatile fatty acids, generated during anaerobic digestion of organic waste, have emerged as a renewable feedstock for microbial oil production. This review discusses the metabolic pathways enabling lipogenesis from volatile fatty acids and strategies to enhance lipid accumulation by tuning the ratios of volatile fatty acids in oleaginous microorganisms.
BIORESOURCE TECHNOLOGY
(2021)
Article
Agricultural Engineering
Peng Yu, Weiming Tu, Menghan Wu, Zuotao Zhang, Hui Wang
Summary: A pilot-scale system producing volatile fatty acids from food waste under acidic conditions was established, with pH level of 6.5 resulting in the highest VFAs yield and increased proportion of butyric acid. Microbial analysis identified dominant bacteria that positively influence the acidification process. This study provides valuable insights for large-scale treatment of food waste.
BIORESOURCE TECHNOLOGY
(2021)
Article
Agricultural Engineering
Umarin Jomnonkhaow, Clarisse Uwineza, Amir Mahboubi, Steven Wainaina, Alissara Reungsang, Mohammad J. Taherzadeh
Summary: Cow manure has long been seen as a waste management challenge, but its organic content presents opportunities for producing value-added bioproducts like VFAs through anaerobic digestion. This study applied thermal pretreatment to inhibit methanogens and utilized an immersed membrane bioreactor for in situ recovery of VFAs, achieving stable long-term production and recovery.
BIORESOURCE TECHNOLOGY
(2021)
Article
Engineering, Environmental
Junkai Hu, Yongde Liu, Xue Song, Jihong Zhao, Qiaochong He
Summary: This study investigated the potential of using Brassica chinensis waste (BCW) for anaerobic fermentative production of volatile fatty acids (VFA). The results showed that stacking time, initial pH, inoculum dose, and temperature all had significant effects on VFA yield and the microbial community structure. Stacking BCW for 3 days resulted in the highest VFA yield of 187.79 mgCOD/gVS. VFA production was inhibited under acidic and alkaline conditions, and the optimal inoculum dose was found to be 2 gTS/L. Firmicutes and Proteobacteria were identified as the dominant microorganisms involved in the acid production step of hydrolysis in anaerobic fermentation.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Engineering, Environmental
Chao Liu, Yinguang Chen, Haining Huang, Xu Duan, Lei Dong
Summary: This study reported a new strategy for improving anaerobic digestion (AD) performance under ammonia pressure by regulating the microbiome and enzymes to enhance volatile fatty acids (VFAs) bioconversion. The addition of glutathione significantly increased methane yield and enhanced bioconversion and cell viability under ammonia stress. Metagenomic and metaproteomic analyses revealed that key microbiota and vital proteins involved in enzyme synthesis and catalysis were enriched in the presence of glutathione. The findings suggest that glutathione plays a role in regulating functional microbiome and enzyme activity, offering an alternative approach for improving AD performance under high ammonia conditions.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Environmental
Xinyu Zhou, Yicheng Du, Dingyi Liu, Jia Luo, Hao Yan, Panyu Li, Jing Chen, Yongkui Zhang
Summary: A new strategy for improving volatile fatty acid (VFA) production from excess sludge (ES) using sodium alcohol ether sulphate (AES) pretreatment was developed. The AES pretreatment proved to enhance the solubilization, hydrolysis, and acidification of organic compounds in the ES, resulting in improved VFA accumulation efficiency and reduced secondary pollution.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Environmental Sciences
Kasra Khatami, Merve Atasoy, Maximilian Ludtke, Christian Baresel, Ozge Eyice, Zeynep Cetecioglu
Summary: The study investigated the impact of different sludge inoculums, pH levels, and retention times on the generation of VFAs during anaerobic digestion of food waste. Acetic acid was the dominant product under alkaline conditions, while propionic and acetic acids were dominant under acidic conditions.
Article
Energy & Fuels
Mukesh Kumar Awasthi, Lukitawesa Lukitawesa, Yumin Duan, Mohammad J. Taherzadeh, Zengqiang Zhang
Summary: In this study, the bacterial community in anaerobic digestion of citrus wastes inoculated with sludge was evaluated, revealing that key bacteria associated with volatile fatty acids (VFAs) production mainly belonged to Firmicutes, Bacteroidetes, and Actinobacteria. The study also observed changes in bacterial diversity among different treatment groups during the anaerobic digestion process.
Article
Environmental Sciences
Mei Zou, Mengyu Yin, Yayi Yuan, Dongbo Wang, Weiping Xiong, Xiao Yang, Yaoyu Zhou, Hongbo Chen
Summary: Triclosan promotes volatile fatty acid accumulation in waste activated sludge anaerobic fermentation, accelerating acid production and enhancing key enzyme activity.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
