Article
Environmental Sciences
Shuli Liu, Aijuan Zhou, Yaxin Fan, Yanqing Duan, Zhihong Liu, Zhangwei He, Wenzong Liu, Xiuping Yue
Summary: In this study, a novel coupling strategy of heat-activated persulfate (Heat_PS) pretreatment and sulfate-reducing bacteria (SRB) triggering was explored to enhance short-chain fatty acids (SCFAs) produced by waste activated sludge (WAS) fermentation. The results showed that this coupling strategy significantly increased SCFAs yield, with the proportion of acetate reaching 57.8%.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Haixiao Guo, Yufen Wang, Lixin Tian, Wei Wei, Tingting Zhu, Yiwen Liu
Summary: The pretreatment of anaerobic sludge with POMs increases the production of SCFAs, improves the biodegradability of organics, and alleviates the inhibition on SCFAs producers, leading to SCFAs accumulation. Additionally, POMs pretreatment has an impact on the microbial community structure.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Jin Li, Wenzhuo Xin, Jiahao Liang, Pengyin Shang, Yanke Song, Qinghong Wang, Mohamed Gamal El-Din, Muhammad Arslan, Shaohui Guo, Chunmao Chen
Summary: Volatile fatty acids (VFA) produced from waste activated sludge (WAS) have the potential for resource recovery in wastewater treatment plants. This study shows that adding refinery spent caustic (RSC) during alkaline fermentation of refinery WAS (RWAS) can enhance VFA production. The enrichment of certain bacteria, as well as increased activity of protease and alpha-glucosidase, contributes to the increased VFA yield. Additionally, the presence of sulfate and free ammonia in RSC likely promotes acetic acid production.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Environmental Sciences
Heming Wang, Jidong Liu, Zizhen Zhang, Juanjuan Li, Huihui Zhang, Yali Zhan
Summary: The alkaline thermal pretreatment significantly enhanced the bioaccessibility and biodegradability of waste activated sludge. The organic matter content after low temperature (90 degrees C) pretreatment was higher than that after high temperature (180 degrees C) pretreatment, with lower energy consumption. Using sludge fermentation liquid (SFL) in microbial electrolysis cells (MECs) resulted in high efficiency of acetic acid utilization and hydrogen production.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Biotechnology & Applied Microbiology
Ruixin Wu, Jinghuan Luo, Shanping Chen, Jianyong Liu, Ruina Zhang, Yu-You Li
Summary: This study investigated the inhibition effect and mechanisms of calcium ions on short-chain fatty acids production from waste activated sludge. The results showed that a high concentration of calcium ions reduced the production of short-chain fatty acids, possibly by inhibiting sludge disintegration and reducing the release of organic substrates.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2022)
Article
Agricultural Engineering
Qingshan Lin, Xinlei Dong, Jinming Luo, Qian Zeng, Jie Ma, Zongping Wang, Guanghao Chen, Gang Guo
Summary: This study investigated an alternative electrochemical pretreatment approach that facilitated acidogenic fermentation of waste activated sludge and food waste, resulting in enhanced production of volatile fatty acids.
BIORESOURCE TECHNOLOGY
(2022)
Article
Engineering, Environmental
Ling Wang, Chunxue Yang, Sangeetha Thangavel, Zechong Guo, Chuan Chen, Aijie Wang, Wenzong Liu
Summary: This study investigated biohydrogen production from pretreated sludge fermentation liquid in microbial electrolysis cells without buffer addition. The highest hydrogen yield was achieved in TA pretreated SFL separated by centrifugation. Pretreated sludge stimulated the accumulation of SCFAs, which were the main substrates for MEC hydrogen production.
FRONTIERS OF ENVIRONMENTAL SCIENCE & ENGINEERING
(2021)
Article
Environmental Sciences
Zhihong Liu, Aijuan Zhou, Yanqing Duan, Sufang Wang, Yanjuan Gao, Xi Chen, Zhixuan Cui, Zhengtong Guo, Xiuping Yue
Summary: This study found that the co-pretreatment of PAA and FNA can effectively promote the production of short-chain fatty acids during anaerobic fermentation of waste activated sludge. Higher dosage of PAA was beneficial for organics release and significantly increased the release compared to lower dosage of PAA. The effective release of soluble organics contributed to the accumulation of SCFAs, with acetic acid and propionic acid being the major components. OH· and O2·- were detected in the co-pretreatment and may play a role in the decomposition of EPS along with other intermediates.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Alice Muhorakeye, Roent Dune Cayetano, Naresh Kumar, Jungsu Park, Ashutosh Kumar Pandey, Sang-Hyoun Kim
Summary: Polyhydroxybutyrate (PHB), a natural polyester, was synthesized using volatile fatty acids (VFAs) as a substrate. Optimization tests were conducted to improve the biodegradability and hydrolysis of waste activated sludge. The results showed that SDBS pretreatment and pH adjustment during continuous acidogenesis yielded stable VFA conversion and high PHB production.
Article
Engineering, Environmental
Boyi Cheng, Yayi Wang, Da Zhang, Di Wu, Feixiang Zan, Jie Ma, Lei Miao, Zongping Wang, Guanghao Chen, Gang Guo
Summary: A new strategy based on thiosulfate pretreatment was proposed to enhance short-chain fatty acids (SCFAs) production during anaerobic fermentation (AF) of waste activated sludge (WAS). The addition of thiosulfate significantly improved the disintegration of WAS, leading to increased SCFA yield. This was achieved through the binding of thiosulfate to organic-binding cations, dispersing the extracellular polymeric substance (EPS) structure and causing cell lysis. The enzyme activities and gene abundances showed enhanced hydrolysis and acidogenesis, while methanogenesis was suppressed. This cost-effective and efficient strategy provides a new approach for resource recovery through thiosulfate-assisted WAS AF.
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)
Article
Green & Sustainable Science & Technology
Yu-Ting Zhang, Wei Wei, Bing-Jie Ni
Summary: This study investigated the impact of ZnO NPs on hydrogen accumulation during WAS fermentation, aiming to provide insights into the mechanisms of enhanced hydrogen production. The results showed significantly increased hydrogen yields while avoiding hydrogen consumption by maintaining pH around 10, suggesting a green and economic strategy for sustainable engineering application of WAS containing ZnO NPs.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Engineering, Environmental
Wenxue Ding, Qian Fang, Wuyang Zhou, Qiqi Ping, Yanyu Xiao, Zhihui Wang
Summary: This study investigated the performance and mechanism of sodium citrate pretreatment to promote the disintegration of waste activated sludge (WAS) and the production of short-chain fatty acids (SCFAs) by anaerobic fermentation. The results showed that SC pretreatment increased SCFAs production by 8.3 times compared to the control group. Moreover, SC increased hydrolytic enzyme activity and inhibited coenzyme F420 activity, leading to increased SCFAs production and decreased consumption rate.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Engineering, Environmental
Qizi Fu, Qiuxiang Xu, Zongyao Liu, Dongbo Wang, Xuran Liu, Dandan He, Yanying He, Yifu Li, Jingnan Yang, Abing Duan
Summary: Potassium permanganate, a versatile strong oxidant, has been used as an effective additive for degrading pollutants and recovering resources from waste activated sludge. Research has shown that KMnO4 significantly reduces H2S production during anaerobic fermentation of waste activated sludge. Furthermore, addition of KMnO4 inhibits the activities of sulfate reducing bacteria and other anaerobes responsible for sulfur-containing organics hydrolysis, leading to a reduction in sulfur-based precipitations and an increase in fermentation pH which benefits the chemical equilibrium of sulfide species.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Agricultural Engineering
Qinghong Wang, Wenzhuo Xin, Zhiguo Shao, Muhammad Usman, Jin Li, Pengyin Shang, Yue Kou, Mohamed Gamal El -Din, Chunmao Chen
Summary: This study compared the effects of different pretreatments on VFAs production from RWAS, and found that alkaline pretreatment showed the highest VFAs yield. The release of CRAM-like compounds and tannin substances in Thermal-PMS and APG groups significantly influenced the acidogenesis and acetogenesis processes. Economically and efficiently, alkaline pretreatment is recommended for the anaerobic fermentation of RWAS.
BIORESOURCE TECHNOLOGY
(2023)
Article
Agricultural Engineering
Yinping Xiang, Meiying Jia, Rui Xu, Jialu Xu, Lele He, Haihao Peng, Weimin Sun, Dongbo Wang, Weiping Xiong, Zhaohui Yang
Summary: This study investigated the impact of the non-antibiotic pharmaceutical carbamazepine on antibiotic resistance genes (ARGs) during anaerobic digestion. The results showed that carbamazepine induced the enrichment of ARGs and increased the abundance of bacteria carrying these genes. It also facilitated microbial aggregation and intercellular communication, leading to an increased frequency of ARGs transmission. Moreover, carbamazepine promoted the acquisition of ARGs by pathogens and elevated their overall abundance.
BIORESOURCE TECHNOLOGY
(2024)
Review
Agricultural Engineering
Weixin Zhao, Tianyi Hu, Hao Ma, Dan Li, Qingliang Zhao, Junqiu Jiang, Liangliang Wei
Summary: This review summarizes the effects and potential mechanisms of biochar on microbial behavior in AD systems. The addition of biochar has been found to promote microbial colonization, alleviate stress, provide nutrients, and enhance enzyme activity. Future research directions include targeted design of biochar, in-depth study of microbial mechanisms, and improved models.
BIORESOURCE TECHNOLOGY
(2024)
Review
Agricultural Engineering
Christina Karmann, Anna Magrova, Pavel Jenicek, Jan Bartacek, Vojtech Kouba
Summary: This review assesses nitrogen removal technologies in reject water treatment, highlighting the differences in environmental impacts and economic benefits. Partial nitritation-anammox shows potential for economic benefits and positive environmental outcomes when operated and controlled properly.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Wei-Hao Huang, Ying-Ju Chang, Duu-Jong Lee
Summary: This study modified pinecone biochar with layered double hydroxide (LDH) to enhance its adsorption capacity for heavy metal and phosphate ions. The LDH-biochar showed significantly improved adsorption capacities for Pb2+ and phosphate, and a slight increase for Cu2+ and Co2+. The LDH layer enhanced the adsorption through various mechanisms.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Chao Song, Fanfan Cai, Shuang Yang, Ligong Wang, Guangqing Liu, Chang Chen
Summary: This paper developed a machine learning model to predict the biochemical methane potential during anaerobic digestion. Model analysis identified lignin content, organic loading, and nitrogen content as key attributes for methane production prediction. For feedstocks with high cellulose content, early methane production is lower but can be improved by prolonging digestion time. Moreover, lignin content exceeding a certain value significantly inhibits methane production.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Sang Min Lee, Ju Young Lee, Ji-Sook Hahn, Seung-Ho Baek
Summary: This study successfully developed an efficient platform strain using Yarrowia lipolytica for the bioconversion of renewable resources into adipic acid, achieving a remarkable increase in production level.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Sefkan Kendir, Matthias Franzreb
Summary: This study presents a novel approach using magnetic separation to efficiently harvest freshwater microalgae, Chlorella vulgaris. By combining pH-induced calcium phosphate precipitation with cheap natural magnetite microparticles, harvesting efficiencies up to 98% were achieved in the model medium.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Ishaq Kariim, Ji-Yeon Park, Wajahat Waheed Kazmi, Hulda Swai, In-Gu Lee, Thomas Kivevele
Summary: The impact of reaction temperature, residence time, and ethanol: acetone on the energy compositions and yield enhancement of biocrudes was investigated. The results showed that under appropriate conditions, biocrudes with high energy and low oxygen content can be obtained, indicating a high potential for utilization.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Xiyue Zhang, Xiyao Li, Liang Zhang, Yongzhen Peng
Summary: Intermittent aeration is an innovative approach to enhance nitrogen removal in low carbon-to-nitrogen ratio municipal sewage, providing an efficient strategy for the continuous plug-flow AOA process.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Xu Yang, Mahmoud Mazarji, Mengtong Li, Aohua Li, Ronghua Li, Zengqiang Zhang, Junting Pan
Summary: This study investigated the impact of magnetite on the nitrogen cycle of pig manure biostabilisation. The addition of magnetite increased N2O emissions and decreased NH3 emissions during composting. It also increased the total nitrogen content but should be considered for its significant increase in N2O emissions in engineering practice.
BIORESOURCE TECHNOLOGY
(2024)
Review
Agricultural Engineering
Ty Shitanaka, Haylee Fujioka, Muzammil Khan, Manpreet Kaur, Zhi-Yan Du, Samir Kumar Khanal
Summary: The market value of microalgae has exponentially increased in the past two decades, thanks to their applications in various industries. However, the supply of high-value microalgal bioproducts is limited due to several factors, and strategies are being explored to overcome these limitations and improve microalgae production, thus increasing the availability of algal-derived bioproducts in the market.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Martin Kerner, Thorsten Wolff, Torsten Brinkmann
Summary: The efficiency of using enriched CO2 from flue gas for large-scale production of green microalgae has been studied. The results show that the use of membrane devices and static mixers can effectively improve the CO2 recovery rate and maintain the suitable pH and temperature during cultivation, achieving a more economical and sustainable microalgae production.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Rui Ma, Ji Li, Rd Tyagi, Xiaolei Zhang
Summary: This review summarizes the microorganisms capable of using CO2 and CH4 to produce PHAs, illustrating the production process, factors influencing it, and discussing optimization techniques. It identifies the challenges and future prospects for developing economically viable PHAs production using GHGs as a carbon source.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Bing Wang, Peng Zhang, Xu Guo, Xu Bao, Junjie Tian, Guomin Li, Jian Zhang
Summary: The addition of zeolite in the co-composting of chicken manure and straw significantly reduced the emissions of ammonia and N2O, and increased the nitrate content. Zeolite also promoted the abundance of nitrification genes and inhibited the expression of denitrification genes.
BIORESOURCE TECHNOLOGY
(2024)
Article
Agricultural Engineering
Rohit Dey, Franziska Ortiz Tena, Song Wang, Josef Martin Messmann, Christian Steinweg, Claudia Thomsen, Clemens Posten, Stefan Leu, Matthias S. Ullrich, Laurenz Thomsen
Summary: This study investigated the operation of a 1000L microalgae-based membrane photobioreactor system for continuous secondary wastewater treatment. The research focused on a green microalgae strain called Desmodesmus sp. The study aimed to understand key trends and optimization strategies by conducting experiments in both summer and winter seasons. The findings showed that maintaining low cell concentrations during periods of light inhibition was beneficial for nutrient uptake rates. Effective strategies for enhancing algae-based wastewater treatment included cell mass recycling and adjusting dilution rates based on light availability.
BIORESOURCE TECHNOLOGY
(2024)