Article
Environmental Sciences
Lixia Jia, Haimeng Sun, Qi Zhou, Liu Zhao, Weizhong Wu
Summary: The study found that PHBV/PLA blends significantly improved the removal efficiency of pollutants in constructed wetlands, particularly in terms of ammonia nitrogen, COD, and total phosphorus. Additionally, Rhodocyclaceae and Bacteroidetes were identified as the primary denitrifying bacteria on the surface of PHBV/PLA blends. The presence of PHBV/PLA blends also influenced the gene expression in the wetlands, leading to better denitrification performance.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2021)
Article
Engineering, Environmental
Qi Zhou, Lixia Jia, Yuanwei Li, Weizhong Wu
Summary: In this study, pyrite/PHBV composites were synthesized and demonstrated the ability to remove nitrogen and phosphate under natural conditions. The composites showed high denitrification rate and low sulfate production, with nitrogen and phosphorus removal efficiencies of 98% and 41%, respectively. The presence of sulfate-reducing bacteria (SRB) in the composites enhanced the denitrification process, and the microbiota dynamics and C, N, S transformation were influenced by Fe oxidizers/reducers and SRB. The synthetic pyrite/PHBV composites are a promising functional material with high denitrification rate and long service life. The sulfate reduction process should not be overlooked in these systems.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Lin Wang, Songhao Shang, Wenzhi Liu, Dongli She, Wei Hu, Yi Liu
Summary: The study investigated the variation of nitrogen components in different aquatic ecosystems and found that nitrogen removal occurred during water flow, with a reduction rate of up to 43%. The heterogeneity in eco-stoichiometric characteristics of nitrogen components was higher in ditches and ponds compared to rivers and reservoirs. Ditches and ponds showed stronger interactions between overlying water and sediment, with higher rates of denitrification and anaerobic ammonium oxidation. The findings emphasize the importance of focusing on the upper reaches of agricultural catchments for nitrogen removal and developing region-specific conservation strategies to mitigate nitrogen pollution and protect water resources.
Article
Agricultural Engineering
Xiping Liu, Xiyao Li, Yongzhen Peng, Qiong Zhang, Hao Jiang, Jiantao Ji
Summary: The study successfully established a SPDAF system for combined treatment of domestic sewage and nitrate wastewater from industrial areas, achieving a high TIN removal efficiency of 89.5%. Anammox played a crucial role in TIN removal, while in-situ fermentation provided electron donors to promote the utilization of complex organics.
BIORESOURCE TECHNOLOGY
(2021)
Article
Agricultural Engineering
Linhui Wu, Xiaoyu Ding, Yan Lin, Xingshun Lu, Hang Lv, Manping Zhao, Ruihong Yu
Summary: A newly identified bacterial strain, Acinetobacter calcoaceticus TY1, efficiently metabolized nitrogen from ammonium at low temperatures, indicating its potential for wastewater management.
BIORESOURCE TECHNOLOGY
(2022)
Article
Engineering, Environmental
Xinjie Gao, Liang Zhang, Yongzhen Peng, Jing Ding, Zeming An
Summary: The study found that stable nitrogen removal can be achieved in the anaerobic/aerobic/anoxic process by directly integrating stable anammox. The anammox activity compensates for the effects of low temperatures and low C/N ratios on nitrification and denitrification, leading to a stable nitrogen removal efficiency.
CHEMICAL ENGINEERING JOURNAL
(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
Green & Sustainable Science & Technology
Ying-ke Fang, Hong-cheng Wang, Jing-long Han, Zhi-ling Li, Ai-jie Wang
Summary: This study investigated the performance and mechanism of nitrogen removal in a novel low-strength wastewater treatment technology called the bioelectrochemical system integrated constructed wetland (BES-CW). The results showed that under low temperature, the BES-CW effectively removed nitrate and reduced greenhouse gas emission. Specific bacteria played a crucial role in the nitrate removal process in the BES-CW.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Engineering, Environmental
Yuanyuan Miao, Liang Zhang, Deshuang Yu, Jianhua Zhang, Wenke Zhang, Guocheng Ma, Xinchao Zhao, Yongzhen Peng
Summary: Intermittent aeration is an effective strategy for biological wastewater treatment, allowing for advanced nitrogen removal and reduced energy consumption. It is suitable for partial nitrification and denitrification processes.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Agricultural Engineering
Yumeng Xie, Xiangli Tian, Yu He, Shuanglin Dong, Kun Zhao
Summary: Recently, functional microorganisms capable of eliminating nitrogenous waste have been used in mariculture systems. Strain DN3, a potential candidate for treating mariculture wastewater, showed a high efficiency in removing ammonia, nitrate, and nitrite at various concentrations and conditions. The nitrogen assimilation pathway and bacterial nitrification pathway were investigated, and the results provide important insight into the nitrogen metabolism of Halomonas sp. and support the use of strain DN3 for treating mariculture wastewater.
BIORESOURCE TECHNOLOGY
(2023)
Article
Environmental Sciences
Adam C. Gold, Suzanne P. Thompson, Michael F. Piehler
Summary: Stormwater wet ponds (SWPs) are important nitrogen sinks that have seasonal variation in nitrogen cycling, affecting pond nitrogen removal. Sediments in SWPs generally function as total nitrogen (TN) sinks during nitrate-enriched conditions, but the fate of nitrate varies based on factors such as water temperature, dissolved organic nitrogen concentrations, and sediment oxygen uptake. This study suggests that coastal stormwater ponds may host reduced conditions that promote nitrate retention over denitrification, highlighting the need for further research on the fate of retained nitrate in SWP sediments and its impact on downstream water quality.
WATER RESOURCES RESEARCH
(2021)
Article
Agricultural Engineering
Yitong Liang, Zemin Li, Bin Zhang, Yushen Zhang, Sijia Ji, Guanglei Qiu, Haizhen Wu, Chaohai Wei
Summary: This study investigated the effects of NO-2 on the synergistic interactions between Anammox bacteria (AnAOB) and sulfur-oxidizing bacteria (SOB) in an autotrophic denitrification-Anammox system. The presence of NO-2 was shown to enhance NH+4 and NO-3 conversion rates, intensifying the synergy between AnAOB and SOB. However, excessive NO-2 inhibited the cooperation between AnAOB and SOB, leading to decreased conversion rates.
BIORESOURCE TECHNOLOGY
(2023)
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
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
Environmental Sciences
Xinjie Gao, Zaizhou Xu, Yongzhen Peng, Liang Zhang, Jing Ding
Summary: This study investigated the nitrogen removal performance of AOA process at low and room temperatures. The results showed that the nitrification capacity of AOA process was recovered at low temperature and the endogenous denitrification performance was enhanced by converting the partial aerobic zone into anoxic. The activity and abundance of ammonia-oxidizing bacteria (AOB) increased at low temperature, which was the key for nitrification capacity recovery. Overall, AOA system showed the possibility of advanced nitrogen removal at low temperatures.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
