Article
Engineering, Chemical
Yanjun Shao, Zhen Zhou, Jie Jiang, Lu-Man Jiang, Jianping Huang, Yi Zuo, Yuqing Ren, Xiaodan Zhao
Summary: This study investigated the impact of hydraulic retention time of anaerobic side-stream reactor (ASSR) on membrane filtration performance and fouling tendency in membrane bioreactors (MBR). The results showed that carrier-enhanced ASSR process had better sludge reduction efficiency and less severe membrane fouling compared to traditional MBR. Microbial analysis revealed the enrichment of fouling-eased group bacteria in carrier-enhanced ASSR, leading to the alleviation of membrane fouling.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Environmental Sciences
Cheng Cheng, Jinju Geng, Haidong Hu, Yihan Shi, Rongwei Gao, Xu Wang, Hongqiang Ren
Summary: The study explored the enhanced effects of alternative aerobic and anaerobic conditions in side-stream reactors on sludge reduction and pollutants removal performance. The results showed improved sludge reduction and carbon reuse in the modified reactors, providing an efficient and cost-saving technology for application in wastewater treatment plants. The cooperation interaction of different microbial populations played a key role in enhancing the overall performance of the treatment system.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Yu Cheng, Kangmin Chon, Xianghao Ren, Ying Lee, Yingying Kou, Yan Wu, Mingyu Shen, Moon-Hyun Hwang, Kyu-Jung Chae
Summary: In-situ sludge reduction efficiency can be significantly improved by inoculating beneficial microorganisms (BM). Bioaugmentation not only enhances species richness and microbial diversity, but also improves microbial community composition, leading to increased potential gene functions of microorganisms for in-situ sludge reduction.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Green & Sustainable Science & Technology
Cheng Cheng, Jinju Geng, Yuan Lin, Qingmiao Yu, Yiran Wang, Fang Man, Hongqiang Ren
Summary: This study revealed the mechanisms behind the low biomass yield of sludge-reducing bacteria in response to changes in DOM molecular characteristics.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Engineering, Environmental
Hao Huang, Yang-fan Deng, Qian Zeng, Philippe M. Heynderickx, Guanghao Chen, Di Wu
Summary: This paper studied a new method that integrates electrochemical pretreatment (EPT) and sulfidogenesis-enhanced anaerobic treatment with a conventional oxic-settling anaerobic (OSA) process to achieve considerable in-situ sludge reduction. The experimental results showed that the new process can successfully reduce sludge production and has high removal efficiencies of COD and TN.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Environmental
Wen Li, Lirong Zhu, Baocun Wu, Yongli Liu, Jinze Li, Linji Xu, Xiaoliu Huangfu, Dezhi Shi, Li Gu, Cong Chen
Summary: This study adopted a side-stream thermophilic anaerobic digestion (STA) strategy to improve the efficiency and stability of a digestive system. The results showed that STA strategy not only increased methane production and system stability, but also optimized organic metabolism patterns and promoted methane production pathways through enhanced enzyme activity.
Article
Green & Sustainable Science & Technology
Cheng Cheng, Jinju Geng, Zhen Zhou, Qingmiao Yu, Rongwei Gao, Yihan Shi, Liye Wang, Hongqiang Ren
Summary: Introducing alternating micro-aerobic/anaerobic conditions and packing carriers into sludge reduction systems can improve sludge reduction efficiency, leading to better effluent pollutant removal and reduced organics bioavailability.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Engineering, Environmental
Yu Xiao-jun, Tian Wen-qing, Deng Ying, Cai Yu-qi, Wang Ya-e, Wang Zhi-long, Jie Li, Juan Ma
Summary: The study found that the enhanced biological phosphorus removal system could maintain stable nutrient removal efficiency even under extremely low dissolved oxygen conditions. However, extracting a higher ratio of anaerobic supernatant in ultra-low dissolved oxygen conditions led to deterioration in phosphorus removal performance.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Environmental Sciences
Lu Qin, Dongqi Wang, Zhe Zhang, Xiaoxiao Li, Guodong Chai, Yishan Lin, Cong Liu, Rui Cao, Yuxin Song, Haiyu Meng, Zhe Wang, Hui Wang, Chunbo Jiang, Yuan Guo, Jiake Li, Xing Zheng
Summary: Dissolved oxygen (DO) concentration was found to have little effect on chemical oxygen demand (COD) removal, but significantly influenced nitrogen and phosphorus removal in biological wastewater treatment systems. Lower DO levels improved nitrogen removal performance, while high DO levels improved phosphorus removal. The side-stream activated sludge hydrolysis (SSH) reactor showed better nutrient removal performance and microbial community stability compared to the conventional anaerobic/anoxic/aerobic (A(2)O) reactor. The microbial community structure was also influenced by changes in DO concentration.
Article
Agricultural Engineering
Wenda Chen, Tao Yu, Dongdong Xu, Wenji Li, Chao Pan, Yiyu Li, Zhuo Zeng, Da Kang, Shengdao Shan, Ping Zheng
Summary: A new DOuble Circulation Anaerobic Sludge bed reactor was developed to enhance the production of endogenous sludge, balancing the discharge of calcified sludge. The method was proven to reduce sludge washout rate and increase sludge proliferation rate effectively.
BIORESOURCE TECHNOLOGY
(2021)
Article
Engineering, Environmental
Najiaowa Yu, Bing Guo, Yingdi Zhang, Lei Zhang, Yun Zhou, Yang Liu
Summary: This study demonstrated improved performance in anaerobic digestion systems by fluidizing GAC in UASB reactors, leading to enhanced methane production and COD removal. The presence of GAC increased concentrations of medium-chain acyl-homoserine lactones and exhibited spatial variation of DIET indicator microorganisms.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Environmental Sciences
Mei Sun, Keke Xiao, Yuwei Zhu, Bei Ou, Wenbo Yu, Sha Liang, Huijie Hou, Shushan Yuan, Fangmao Gan, Rongxi Mi, Jiakuan Yang
Summary: The role of microplastic size on anaerobic sludge digestion was evaluated in this study. It was found that larger PVC particles resulted in higher methane production, solubilization of organic matter, and microbial activity.
ENVIRONMENTAL RESEARCH
(2022)
Article
Environmental Sciences
Zhengliang Du, Peipei Zhao, Qinglong Fu, Qiandi Wang, Aibin Hu, Weijun Zhang, Dongsheng Wang
Summary: This study investigated the molecular composition and transformation of dissolved organic matters (DOMs) recovered from anaerobic digestion sludge (ADS) through a mild-temperature alkali-hydrothermal treatment (AHT) and evaluated their fertilizing effects on rice growth. The results showed that AHT processes promoted the solubilization and release of DOMs from ADS, which mainly consisted of N-containing compounds with aromatic or N-heterocyclic rings. AHT processes at different pH values induced the hydrolysis and decomposition of protein-like and heterocyclic-N substances in DOMs, as well as the degradation and removal of phytotoxic oxygenated aromatic substances. Rice hydroponic test confirmed that ADS-derived DOMs recovered by AHT process at pH of 12 exhibited the highest bioactivity for rice growth, attributed to the abundance of amino compounds and humic substances. This study provides a novel process for recovering high-quality liquid organic fertilizer from ADS, enriching the technical options for the safe utilization of sludge resources.
ENVIRONMENT INTERNATIONAL
(2023)
Review
Environmental Sciences
Anna Christine Trego, Simon Mills, Gavin Collins
Summary: Anaerobic digestion is recognized as a sustainable method for waste management, producing methane-rich biogas. Different specialized granules, including anaerobic and aerobic granules, have opened up new opportunities in wastewater treatment and resource recovery biotechnology. Each type of granule has unique characteristics, biochemical processes, and microbial community compositions.
CRITICAL REVIEWS IN ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2021)
Article
Agricultural Engineering
Han Yan, Jianzheng Li, Jia Meng, Jiuling Li, Avinash Kumar Jha, Yafei Zhang, Yiyang Fan, Xin Wang
Summary: The performance of anaerobic sludge and microbial social behaviors in an expanded granular sludge bed (EGSB) were evaluated by increasing reflux ratio from 50% to 500% in stages. The study found that a reflux ratio of 100% - 200% was most favorable for EGSB with a methane production of 2.4 m3/m3.d. Acylhomoserine lactones (AHLs)-mediated quorum sensing (QS) played a key role in balancing microbial populations and enhancing the anaerobic digestion process.
BIORESOURCE TECHNOLOGY
(2021)
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)