Article
Environmental Sciences
Jiapeng Wu, Yiguo Hong, Xiaohan Liu, Yaohao Hu
Summary: This study investigated the structure and function of denitrifiers and anammox bacteria in coastal sediment cores collected from Daya Bay in winter and summer, revealing depth-related variations in their activities and abundances. While denitrifiers showed higher activities and abundances in surface sediments, anammox bacteria became more dominant in subsurface sediments. The availability of electronic acceptors strongly influenced nitrogen loss activities in subsurface sediments, highlighting their role as a sink for buried nitrogen.
ENVIRONMENTAL POLLUTION
(2021)
Review
Engineering, Environmental
Mengjie Ma, Qianfei Cao, Adams Mabruk, Junxiang Xie, Peng Wu, Wenru Liu, Chongjun Chen
Summary: The anammox process is an effective nitrogen removal technology, but its growth rates are low and sensitive to operational and environmental conditions. Recent studies have shown that the addition of exogenous substances can improve the performance and microbial community of anammox.
JOURNAL OF WATER PROCESS 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
Biotechnology & Applied Microbiology
Xiaojing Zhang, Denghui Wei, Zhao Chen, Hongli Zhang, Han Zhang, Bingbing Ma, Aihua Gao
Summary: The simultaneous removal of nitrogen and sulfur pollutants is crucial, with low levels of sulfide enhancing total nitrogen removal efficiency while high levels of sulfide significantly decrease efficiency. After acclimatization, the CANON system can resist sulfide shock and achieve good nitrogen removal efficiency under 5 mg L-1 sulfide concentration. Prominent nitrogen removal is achieved through the cooperative contribution of CANON bacteria and denitrifying bacteria in the system.
BIOCHEMICAL ENGINEERING JOURNAL
(2021)
Article
Biotechnology & Applied Microbiology
Xiaoying Mu, Jinjin Yang, Genwang Chang, Yifei Yang, Shaokang Li, Jingwen Luo, Xiang Li
Summary: Microbial community plays a vital role in efficient nitrogen removal in an anaerobic ammonium oxidation (anammox) system. This study revealed that the addition of fillers significantly improved the nitrogen removal efficiency, and the changes in microbial community structure and metabolic capacity were observed. Co-occurrence network analysis showed the important roles of certain key microbial species in enhancing the nitrogen removal capability.
BIOCHEMICAL ENGINEERING JOURNAL
(2023)
Article
Environmental Sciences
Yuyue Huang, Wei Li, Jie Gao, Fang Wang, Wei Yang, Le Han, Dunmei Lin, Bolin Min, Yue Zhi, Khara Grieger, Jingmei Yao
Summary: This study reveals that microplastics have impacts on ecosystem functions mediated by benthic biota, especially at higher concentrations, indicating adverse effects on microbial nitrogen removal mediated by macroinvertebrates. The findings emphasize the importance of understanding the comprehensive impacts of microplastics on the functioning in freshwater ecosystems.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Engineering, Environmental
Tao Ya, Shuai Du, Zhenyang Li, Shidi Liu, Minghan Zhu, Xiaojing Liu, Zibo Jing, Reti Hai, Xiaohui Wang
Summary: The study found that high salinity inhibits the performance of anammox, but under low salinity conditions, microbial networks become closer and more complex, serving as a survival strategy. Microbial taxa such as Planctomycetes and Candidatus Kuenenia show increased competitive relationships under 30 g/L NaCl, which may contribute to the deterioration of nitrogen removal. However, the microbial community network tends to gradually adapt to elevated salinity, indicating a potential for resilience.
Article
Engineering, Environmental
Zhaopeng Qu, Jin Li, Zhi Hu, Wenzong Liu, Aijie Wang
Summary: Currently, conventional biological nitrogen removal processes face challenges in removing ammonium from saline wastewater. This study successfully utilized marine anammox bacteria in a microbial electrolytic cell to convert NH4+-N to N2. In addition, the application of voltage increased microbial diversities at the electrode surface and promoted the formation of electrode biofilm.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Agricultural Engineering
Li Zhang, Shuang Lan, Shiwei Hao, Tingjun Dong, Yongzhen Peng, Jiachun Yang
Summary: This study investigated the mechanisms of Fe2+ on nitrogen and phosphorus removal and functional bacterial competition in anammox systems. The results showed that under 0.12 mM Fe2+, the removal performance of nitrogen and phosphorus increased by 10.08% and 151.91%, respectively. Phosphorus removal was achieved through biomineralization induced by extracellular polymeric substances (EPS), with the functional group C-O-C in EPS playing a critical role. Fe2+ weakened the competition between heterotrophic denitrifier and anammox microbe, which facilitated the enrichment of anammox biomass. Furthermore, Fe2+ improved electron behaviors during the nitrogen metabolism of anammox systems.
BIORESOURCE TECHNOLOGY
(2022)
Article
Engineering, Environmental
Xinyi Zou, Mengjie Ma, Jiachen Zhu, Qun Zhang, Qianfei Cao, Sami Khasraw Hamid, Chongjun Chen
Summary: The study found that salinity, represented by SO42-, has an impact on the anammox reaction. Increasing concentrations of SO42- decreased the removal efficiency of NH4+-N and NO2--N, as well as affected the sludge characteristics and microbial community structure.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Engineering, Environmental
Changhao Lu, Chunli Yuan, Tong Zhu, Youzhao Wang
Summary: The research found that humic acid can significantly enhance nitrogen removal efficiency and rate in a single-stage nitrogen removal reactor. The variation in humic acid concentration has different effects on nitrogen removal rate, and the effects may be related to the promotion of nitrification by humic acid.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Environmental Sciences
Wei Zhang, Xin Zhou, Xiwei Cao, Shuhan Li
Summary: This study introduces low intensity ultrasound into anaerobic sequencing batch biofilm reactors (ASBBRs) to enhance anammox nitrogen removal from nitrogen-rich wastewater. The study demonstrates a close correlation between nitrogen removal and shifts in transformation and intensity of spectrum peaks, as well as changes in the anammox consortium. The research provides a viable and promising acceleration strategy for anammox-based process.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Review
Engineering, Environmental
Quan Zhang, Xijun Xu, Ruochen Zhang, Bo Shao, Kaili Fan, Lei Zhao, Xiaoming Ji, Nanqi Ren, Duu-Jong Lee, Chuan Chen
Summary: This review summarizes the recent advances and characteristics of the mixed/mixotrophic nitrogen removal (MixNR) process guided by sulfur-driven autotrophic denitrification (SDAD) and anammox. It discusses the functional microorganisms in different MixNR systems, sheds light on metabolic mechanisms and microbial interactions, and highlights the importance of MixNR for carbon reduction in the BNR process. Knowledge gaps and future research directions that may facilitate the practical application of the MixNR process are also emphasized.
Article
Environmental Sciences
Xuejiao Yin, Jiaxin Wen, Yihang Zhang, Xin Zhang, Jujiao Zhao
Summary: The anammox process was studied in a single-stage moving bed biofilm reactor, and the excess removal of ammonia nitrogen was investigated. With the addition of internal circulation, the removal efficiency of ammonium reached about 96% and the total nitrogen removal efficiency reached about 86%.
Article
Environmental Sciences
Corianne Tatariw, Olivia U. Mason, Behzad Mortazavi
Summary: The constructed stormwater control systems can be biogeochemical hotspots, but their ecosystem structure may become homogenized due to construction and management. Roadside ditches, a common landscape feature, have high potential for nitrate removal with denitrification and anammox processes dominating. Although soil characteristics were similar between different land use types, denitrification potential rates were lower in forested ditches compared to urban and agricultural ditches, possibly due to differences in vegetation management. Microbial diversity was consistent across land use types, but indicator species analysis showed significant microbial groups in urban and agricultural ditches involved in nitrogen removal processes. Land use effects on nitrogen removal in these constructed drainage networks are mediated through key microbial groups and ditch vegetation management strategies, indicating significant potential for reactive nitrogen removal in the landscape.
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
(2021)