Article
Engineering, Environmental
Xiao-Li Yang, Ling Zang, Jia-Jin Chen, Han Xu, Yi-Jing Yang, Hai-Liang Song
Summary: In this study, a three-chamber microbial electrolysis cell (MEC) was used to simultaneously migrate, transform, and remove NH4+-N, NO2--N, and NO3--N under different applied voltages. Higher applied voltages accelerated the migration rate of NH4+-N but had little effect on NO2--N and NO3--N. The highest total nitrogen (TN) removal efficiency was achieved at an applied voltage of 1.0 V. The study also discussed the nitrogen removal performance at different carbon to nitrogen (C/N) ratios, indicating the beneficial effect of nitrogen migration by applied voltages combined with nitrogen transformation.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Green & Sustainable Science & Technology
Fangyuan Jiang, Yueling Qi, Xianyang Shi
Summary: This study investigated the effects of different carbon sources on the denitrification performance, soluble microbial products (SMPs), and microbial community in lab-scale denitrification biofilters. The results showed that the denitrification efficiency varied with different carbon sources and the components of SMPs had varying effects on denitrification.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Engineering, Environmental
Junfeng Yang, Yujie Qin, Xiangyin Liu, Lan Yang, Shaohong Zheng, Siyuan Gong, Zhiju Liu, Chenglong Wu, Xinyue Lin, Tiansheng Lu, Jiannv Chen
Summary: In this study, the effects of different electron donors on the nitrogen removal performance and microbial characteristics of a denitrification system were investigated. The addition of glucose led to advanced nitrogen removal and a potential interaction model between sulfur autotrophic and heterotrophic bacteria.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Multidisciplinary Sciences
Han Li, Ying Cui, Fei Wang, Jinghua Li, Dafu Wu, Jing Fan
Summary: In this experiment, the efficiency of nitrate nitrogen removal using different microbial inoculates varied among voltages in an electrochemical denitrification device. Low current (produced by the applied voltage) increased the diversity and richness of microorganisms, while the applied voltage significantly affected the abundance of specific microbial groups.
Article
Engineering, Environmental
Buqing Chen, Yujie Qin, Chenglong Wu, Zhiju Liu, Lan Yang, Siyuan Gong, Shaohong Zheng
Summary: This study assessed the effect of glucose in a DEAMOX reactor, and found that adding glucose can promote nitrogen removal efficiency while maintaining a synergic relationship between denitrification microorganisms and anammox microorganisms during the DEAMOX process.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Green & Sustainable Science & Technology
Yue Wang, Zhiping Zhu, Xinrong Li, Jinfeng Yang, Lina Liang, Qianwen Sui, Bin Wang, Hongmin Dong
Summary: The study found that storage temperature has a significant impact on gas emissions from digested pig slurry, with increased emissions of NH3, N2O, and NO observed at higher temperatures. Controlling the slurry temperature below 15 degrees Celsius can effectively reduce the emissions of NH3 and N2O.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Engineering, Environmental
Zhixing Xiao, Dong Wang, Ting Xia, Huifang Wu, Dan Chen
Summary: The study found that a lower current density (0.10 mA/cm(2)) achieved optimal nitrate removal efficiency in the PBES system, while higher current density did not improve removal performance. Additionally, the activities of nitrate reductase and nitrite reductase in both cathode and pyrite biofilms showed similar trends with nitrate removal. Furthermore, pyrite-oxidizing denitrification contributed significantly more to nitrate removal in the PBES system compared to hydrogenotrophic denitrification.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Environmental Sciences
Yumiao Lu, Wenlong Zhang, Yi Li, Chi Zhang, Longfei Wang, Lihua Niu, Huanjun Zhang
Summary: This study aims to determine the microbial assemblage and functional patterns under black carbon addition, and found that the nitrate removal efficiency of modified black carbon system achieved 46.44%. The deterministic process dominated the assemblage of community, with key taxa like Sulfuricella, Allorhizobium, and Nitrospira stimulating the shift of community composition regarding nitrogen removal.
ENVIRONMENTAL RESEARCH
(2021)
Article
Agricultural Engineering
Xiao Huang, Kai Yao, Jianghua Yu, Wenyi Dong, Zilong Zhao
Summary: Fe3+ addition has different effects on the removal of nitrogen and phosphorus. Fe3+ can promote the removal of ammonia nitrogen and nitrification process, but inhibits denitrification process and reduces the abundance of denitrifying bacteria and biological phosphorus removing bacteria.
BIORESOURCE TECHNOLOGY
(2022)
Article
Engineering, Environmental
Cui Liu, Xiao Huang, Jianghua Yu, Wei Si, Yicheng Fu
Summary: Using water supply sludge to prepare ceramsite for sewage treatment shows good adsorption performance and removal efficiency. The optimal conditions for water supply sludge-based ceramsite were determined, and it demonstrated high adsorption of NO3 -N and PO43 -P. When used as denitrification biofilter carrier, the removal efficiencies of COD and TN were high, but TP removal efficiency gradually decreased. The microbial community richness remained stable during the biofilm formation, but microbial diversity decreased. The main dominant microbial communities were Acinetobacter and Methylophilaceae.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Agricultural Engineering
Shuohui Shi, Lei He, Ying Zhou, Xing Fan, Ziyuan Lin, Xuejie He, Jian Zhou
Summary: This study investigated the response of a thermophilic denitrification system (50 degrees C) to a wide range of pH (3-11) and found that it could adapt to pH 5-11 but suffered from nitrite and ammonia accumulation at pH 3. The enrichment of specific functional thermophiles contributed to the tolerance towards unfavorable pH, and the selection advantage of nitrate reducing bacteria and the enrichment of DNRA bacteria were responsible for the nitrite and ammonia accumulation at pH 3. Functional gene prediction denoted higher narG/(nirK + nirS) and nrfA at pH 3, facilitating partial denitrification and DNRA.
BIORESOURCE TECHNOLOGY
(2022)
Article
Environmental Sciences
Lin Wang, Bingrong Li, Yongmei Li, Jianmin Wang
Summary: The study found that specific nitrification and denitrification rates increased under low dissolved oxygen conditions, with a decrease in the oxygen half saturation constant for both ammonia oxidizing bacteria and nitrite oxidizing bacteria. The observed yield coefficients also increased, along with higher relative abundances of AOB, NOB, and denitrifiers detected through high-throughput sequencing. Improved simultaneous nitrification and denitrification under low DO conditions contributed to enhanced nitrogen removal.
Article
Environmental Sciences
Xin Ling, Guanghua Lu, Chenwang Xue
Summary: Microorganisms play a critical role in nitrogen removal in high-altitude rivers, which is influenced by various environmental factors and human activities. This study investigated nitrogen conversion rates and bacterial communities in the Yarlung Zangbo River and found that denitrification was the dominant process for nitrate removal. Environmental factors and denitrifier abundance jointly regulated nitrogen removal in high-altitude rivers.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Environmental Sciences
Sina V. Moghadam, Arash Jafarzadeh, Akanksha Matta, Samer Dessouky, Jeffrey Hutchinson, Vikram Kapoor
Summary: This study examined the performance of a detention basin in mitigating nitrogen pollution using quantitative PCR to measure the abundance of N-cycling genes in the soil media. Results showed a net export of nitrogen from the basin, with no significant differences in in- and outflow concentrations. The abundance of different genes varied with season and soil sampling depth, and Actinobacteria and Proteobacteria were the dominant phyla based on 16S rRNA gene sequencing.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Green & Sustainable Science & Technology
Jiafeng Ding, Bin Chen, Yinan Zhang, Xueping Ye, Yan Li, Dongren Zhou, Ying Ding, Weiqin Zhu, Hangjun Zhang
Summary: The study revealed that 1,4-PBS can significantly improve the nitrogen removal performance of microbial communities by increasing microbial diversity and indirectly changing the structure of microbial communities.
JOURNAL OF CLEANER PRODUCTION
(2021)