Article
Environmental Sciences
Wenqian Zhang, Bo Liu, Zhenzhu Sun, Tingyu Wang, Simin Tan, Xin Fan, Danyang Zou, Yutong Zhuang, Xinting Liu, Yizhu Wang, Yanyu Li, Kangsen Mai, Chaoxia Ye
Summary: This study found differences in nitrogen removal characteristics and microbial community changes between freshwater and marine conditions in recirculating aquaculture system (RAS). Ammonia nitrogen was rapidly converted to nitrite nitrogen in marine RAS, which had lower tightly bound extracellular polymeric substances, poorer stability and settleability conditions, and lower bacterial diversity and richness.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Chemistry, Physical
Miftahul Choiron, Seishu Tojo, Tadashi Chosa
Summary: The study found that hot compressed water treatment can increase biogas production and COD removal efficiency in RTAD system, especially with shorter hydraulic retention time. The recirculation process can improve the stability of pH in the reactor.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Environmental Sciences
Matthew S. Recsetar, Kevin M. Fitzsimmons, Joel L. Cuello, Christiane Hoppe-Jones, Shane A. Snyder
Summary: The study combined bioreactors with different plants and treated wastewater, finding that bioreactors were effective in removing contaminants from wastewater, with cotton-planted bioreactors showing a more significant removal effect on sulfamethoxazole.
Article
Agricultural Engineering
Kaichong Wang, Zhen Zhou, Siqi Yu, Jiaxin Qiang, Yao Yuan, Yangjie Qin, Kaiqi Xiao, Xiaodan Zhao, Zhichao Wu
Summary: CAIRM combines chemically enhanced primary treatment, ammonium ion exchange, and regeneration, as well as membrane bioreactor, to efficiently treat domestic wastewater. It achieved efficient removal of pollutants, with TN concentration of 2.3±0.9 mg/L in the effluent. This integrated process addresses critical challenges of insufficient nitrogen removal and high land occupancy of current processes.
BIORESOURCE TECHNOLOGY
(2021)
Article
Agricultural Engineering
Mengmeng Yi, He Wang, Xiaona Ma, Chun Wang, Miao Wang, Zhigang Liu, Maixin Lu, Jianmeng Cao, Xiaoli Ke
Summary: A highly efficient bacterium, Pseudomonas chengduensis BF6, was isolated from biofilters of recirculating aquaculture systems (RAS) and found to be capable of removing nitrogen through denitrification, anammox, and assimilation pathways. The strain BF6 exhibited maximum total nitrogen removal efficiencies of 97.00%, 61.40%, 79.10%, and 84.98% for ammonia, nitrate, nitrite, and mixed nitrogen sources, respectively, within 24 hours. Furthermore, BF6 altered microbial diversity and increased the relative abundance of Pseudomonas in the RAS biofilter.
BIORESOURCE TECHNOLOGY
(2023)
Review
Fisheries
Hao Li, Zhengguo Cui, Hongwu Cui, Ying Bai, Zhendong Yin, Keming Qu
Summary: Aquaculture has the potential to meet the increasing demand for food, but often harms the environment. Recirculating aquaculture system (RAS) is a sustainable and green mode of aquaculture that can increase yields while minimizing negative impacts on the environment.
Article
Biotechnology & Applied Microbiology
Wilasinee Kotcharoen, Takahiro Watari, Nur Adlin, Yoshinobu Nakamura, Penpicha Satanwat, Wiboonluk Pungrasmi, Sorawit Powtongsook, Yutaka Takeuchi, Masashi Hatamoto, Shinichi Yamazaki, Takashi Yamaguchi
Summary: The study found that the DHS and USB reactors can effectively remove nitrogen under different salinity conditions. Results on water quality and fish growth indicate that the best nitrogen removal efficiency and highest daily weight gain of fish were achieved at 15%o salinity.
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
(2021)
Article
Agricultural Engineering
Liang Li, Shaojun Xiong, Qichun Wang, Chenyao Xue, Ping Xiao, Guangsheng Qian
Summary: The strategy of high reflux ratio and long solids retention time was used to achieve efficient nitrogen removal from real shale oil wastewater. The study found that the capacity of dominant heterotrophic nitrifying and aerobic denitrifying bacteria is the key to efficient nitrogen removal with a low COD/TN ratio.
BIORESOURCE TECHNOLOGY
(2023)
Article
Environmental Sciences
Jiafu Xi, Zhen Zhou, Yao Yuan, Kaiqi Xiao, Yangjie Qin, Kaichong Wang, Ying An, Jianfeng Ye, Zhichao Wu
Summary: Efficient and space-saving technologies for on-site treatment of stormwater runoff are essential to control urban surface water pollution. The CFFA treatment system in this study achieved synchronous removal of multiple contaminants with the highest pollutant removal loads compared to reported processes.
Article
Environmental Sciences
Zhuowei Zhang, Huining Zhang, Hamid Mohammed Al-Gabr, Huixia Jin, Kefeng Zhang
Summary: The study found that using sponge iron in SI-MBR compared to GAC-MBR resulted in higher efficiency in removing organic matter and nitrogen, as well as a more diverse bacterial community, with iron ions significantly enhancing bacterial activity.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Environmental Sciences
S. Ibeid, M. Elektorowicz
Summary: The study found that the submerged membrane electro-bioreactor had high removal efficiency of ammonium and nitrate at low carbon concentrations, outperforming the membrane bioreactor. The system showed the capability to remove nitrogen components regardless of carbon/nitrogen ratio.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Environmental
Jianping Xu, Tianlong Qiu, Fudi Chen, Li Zhou, Yishuai Du, Jianming Sun
Summary: In this study, electrocoagulation (EC) technology was used to improve the performance of Litopenaeus vannamei (L. vannamei) recirculating aquaculture system (RAS) and investigate the nitrogen migration law and recovery strategy. The findings showed that EC significantly enhanced nitrogen removal in RAS, and Chlorella vulgaris was effective in recovering waste nitrogen from the system.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Guocheng Zhu, Junming Chen, Shanshan Zhang, Zilong Zhao, Huihao Luo, Andrew S. Hursthouse, Peng Wan, Gongduan Fan
Summary: Black-odorous waters are a common phenomenon characterized by excessive levels of nutrients. A novel aeration-adsorption system using fiber balls was found to effectively remove ammonia nitrogen and total nitrogen from black-odorous waters. Additionally, it significantly reduced total phosphorus and phosphate concentrations, meeting China's wastewater discharge standards.
ENVIRONMENTAL CHEMISTRY LETTERS
(2022)
Article
Environmental Sciences
Alireza Neissi, Gholamreza Rafiee, Shadi Rahimi, Hamid Farahmand, Santosh Pandit, Ivan Mijakovic
Summary: The aim of this study was to enrich high-performance microbial communities for the removal of ammonium and nitrite from aquaculture water. Ammonium oxidizing bacteria (AOB) and nitrite oxidizing bacteria (NOB) were enriched from different environmental water samples and adapted to different temperatures. The microbial communities containing Nitrosomonas oligotropha and Nitrobacter winogradskyi showed the highest removal activity at all temperatures and do not contain any pathogenic bacteria. Using the enriched microbial communities, a significant improvement in the removal of ammonium and nitrite was achieved compared to commonly used communities in biofilters.
Article
Engineering, Chemical
Kaiqi Xiao, Kaichong Wang, Siqi Yu, Yao Yuan, Yangjie Qin, Ying An, Xiaodan Zhao, Zhen Zhou
Summary: A novel pretreatment process using chemically enhanced primary treatment (CEPT) and ammonia nitrogen ion exchange and regeneration (AIR) was proposed to improve membrane fouling in membrane bioreactors (MBRs). The pretreated MBRs showed comparable levels of COD and NH4+-N with conventional MBRs, but much lower concentrations of total nitrogen and total phosphorous. The pretreatment process effectively removed particles and soluble proteins, inhibited EPS secretion, and alleviated membrane fouling.
JOURNAL OF MEMBRANE SCIENCE
(2023)
