Article
Environmental Sciences
Xiaowen Li, Dong Bai, Qinghui Deng, Xiuyun Cao, Yiyong Zhou, Chunlei Song
Summary: DNRA rates in Xiamen Bay were influenced by sulfide, organic carbon, nrfA gene abundances, and DNRA bacteria community. The main phyla of DNRA bacteria were Bacteroidetes and Proteobacteria, with Pelobacter being the dominant genus. Additionally, the correlation analysis showed positive relationships between DNRA rate, nrfA abundance, environmental factors such as nitrite, total organic carbon, acid volatile sulfide, and total nitrogen.
JOURNAL OF SOILS AND SEDIMENTS
(2021)
Article
Engineering, Marine
Niu Li, Ming Nie, Ming Wu, Jihua Wu
Summary: Invasive Spartina alterniflora significantly increased DNRA rates in both upper and deeper soil layers, contributing to N savings and potentially facilitating its own invasion. SO42-and pH regulated DNRA rates in different seasons in the soil.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Environmental Sciences
Hezhong Yuan, Bingchan Jia, Qingfei Zeng, Yanwen Zhou, Juan Wu, Haixiang Wang, Hao Fang, Yiwei Cai, Qiang Li
Summary: This study assessed the impact of dissimilatory nitrate reduction on the phosphorus cycle in lacustrine sediment. The results showed that nitrate reduction facilitated the accumulation of phosphorus in lake water. The synchronous control of nitrogen and phosphorus is crucial for the management and restoration of lake eutrophication.
Article
Engineering, Environmental
Hua Deng, Ruilong Li, Beizhan Yan, Bowen Li, Qiqing Chen, Hui Hu, Yong Xu, Huahong Shi
Summary: The research found that the wetlands in the Yangtze Estuary are moderately polluted by PAEs and PBDEs, mainly from plastic fragment and microplastic leakages, posing high ecological risks. Strengthening environmental control of plastic waste is necessary.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Water Resources
Jingya Xue, Zhonghua Zhao, Xiaolong Yao, Weiting Liu, Lu Zhang
Summary: This study found that NH4+ regeneration rates and community biological NH4+ demand increased downstream in the Yangtze River continuum, with higher rates in the estuary. Suspended solids were the main factor influencing NH4+ recycling rates. The regenerated NH4+ in the river-estuary continuum accounted for about 14% of total N inputs, suggesting its importance as an N source for microbes and in nutrient dynamics.
HYDROLOGICAL PROCESSES
(2021)
Article
Environmental Sciences
Yaojin Xiong, Yao Du, Yamin Deng, Teng Ma, Dian Li, Xiaoliang Sun, Guangning Liu, Yanxin Wang
Summary: This study used multiple stable isotopes and spectral characteristics of DOM to investigate the sources and fate of nitrate and ammonium in groundwater in the Central Yangtze River Basin. Different hydrogeological conditions were found to control the behavior of nitrogen compounds in three subareas, leading to contrasting patterns of nitrogen sources and fate.
ENVIRONMENTAL POLLUTION
(2021)
Article
Environmental Sciences
Zeyan Zhou, Panyue Zhang, Guangming Zhang, Siqi Wang, Yajing Cai, Hongjie Wang
Summary: The study on the vertical microplastic distribution in estuary sediment of Fuhe River in northern China revealed that microplastic content decreased with depth, with the highest content in the topmost sediment layer. The smaller particle size and higher proportion of colored microplastics were found in deeper sediment layers. The spatial distribution of microplastics in sediments was closely related to human activities, with higher content in areas with more intense human activities.
Article
Engineering, Civil
Ya Wu
Summary: High levels of ammonium in the coastal acidic groundwater of Beihai, Southern China pose a threat to surface ecosystems and water supplies. A study was conducted using hydrochemical and isotopic analysis to investigate the occurrence of ammonium and its genesis. The findings suggest that dissimilatory nitrate reduction to ammonium plays a critical role in the enrichment of ammonium concentrations in groundwater.
JOURNAL OF HYDROLOGY
(2022)
Article
Soil Science
Xin Fang, Zhishu Yang, Jiangang Han
Summary: This study investigated the effects of different vegetation belts and seasonal changes on DNF, DNRA, and bacterial community structure in a coastal wetland. The results showed that DNRA was the dominant process in NO3- reduction in this wetland, and the DNRA/DNF ratios were positively correlated with soil NO3- concentrations.
APPLIED SOIL ECOLOGY
(2022)
Article
Environmental Sciences
Achen Wang, Xiang Li, Xiuli Hao, Xuesong Luo, Wenli Chen, Qiaoyun Huang
Summary: Heavy metal remediation treatments can influence the assembly of functional microbial communities, specifically the Dissimilatory nitrate reduction to ammonia (DNRA) bacteria. The abundance and diversity of the DNRA bacterial community were correlated with pH, nitrogen availability, and metal concentrations. The assembly processes were mainly driven by deterministic factors, with NH4+ playing a crucial role. However, pH, phosphorus, and metal availability also had auxiliary regulatory effects on the DNRA bacterial community.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Weiwei Song, Yi Li
Summary: This study investigated the ecological state of typical tidal flats along the eastern coast of China using field sampling, numerical simulation, and high-throughput sequencing. The findings revealed that the microbial communities in different subregions of the area exhibited notable differences due to variations in water quality and pollutant discharge. The study identified the impact of river pollutants on wetland microbial communities and established ecological patterns between the river and the sea, offering suggestions for watershed management and protection of coastal tidal flats.
ENVIRONMENTAL RESEARCH
(2023)
Article
Environmental Sciences
Jinjin Sun, Momei Qin, Xiaodong Xie, Wenxing Fu, Yang Qin, Li Sheng, Lin Li, Jingyi Li, Ishaq Dimeji Sulaymon, Lei Jiang, Lin Huang, Xingna Yu, Jianlin Hu
Summary: This study utilized the CMAQ model to investigate the impact of regional transport, physical processes, and formation pathways on NO3- and total nitrate production in the Yangtze River Delta region in 2017. Findings show that NO3-/PM2.5 and NO3-/TNO3 levels are highest in winter, influenced primarily by aerosol processes and various formation pathways.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2022)
Article
Marine & Freshwater Biology
Leihua Zhao, Pei Xin, Haifeng Cheng, Ao Chu
Summary: This study shows that river discharge regulation and estuarine morphological evolution are crucial in determining the salinity distributions and variations in the Yangtze Estuary. The construction of the Three Gorges Reservoir has significantly affected the salinity, while the morphological changes have impacted the salinity in the estuarine wetlands.
ESTUARINE COASTAL AND SHELF SCIENCE
(2022)
Article
Environmental Sciences
Feng Cao, Shouye Yang, Daqiang Yin, Rui Wang
Summary: A comprehensive investigation was conducted to explore the distributions of total mercury (THg) and methylmercury (MeHg) in sediments and porewater along a typical transect from the Yangtze River Estuary (YRE) to the East China Sea (ECS) open shelf. The study found that THg concentrations in surface sediments varied across sites, higher in the estuary mixing region, especially within the turbidity maximum zone (TMZ). MeHg concentrations in surface sediments were higher in the estuary mixing region and the ECS open shelf than in the river channel, with higher MeHg/THg ratios in sediments and porewater at the open shelf sites.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Microbiology
Ran Jiang, Wen-Jing Qin, Ru-Yi Zhang, Kai Zhang, Xing Huang, Yong Li, Chen-Hao Zhou, Ting Zhu, Yan Zhang, Bin Zou, Ming Nie, Sung-Keun Rhee, Zhe-Xue Quan
Summary: This study demonstrates the significant impact of salinity on the abundance, activity, and relative contribution of comammox Nitrospira in coastal ecosystems. Different phylotypes of comammox Nitrospira exhibit varying sensitivity to salinity.
Article
Engineering, Environmental
Xiufeng Cao, Xiaowei Cui, Meng Xie, Rui Zhao, Lei Xu, Shouqing Ni, Zhaojie Cui
Summary: Intensified phytoremediation shows great potential in remediation of complex co-contaminated soils, with different plants exhibiting varying efficiency in removing PAHs and heavy metals. Amendments and microbial agents can significantly increase the efficiency of phytoremediation.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Multidisciplinary Sciences
Yuyang Xie, Xiaolin Liu, Haiwei Wei, Xue Chen, Ningji Gong, Shakeel Ahmad, Taeho Lee, Sherif Ismail, Shou-Qing Ni
Summary: Direct sewage discharge has serious and irreversible harm to the environment, especially to the river ecosystem. Sewage discharge leads to changes in the microbial community structure of the river, reducing the diversity and richness of bacteria, while increasing the gene abundance of pathogenic bacteria.
SCIENTIFIC REPORTS
(2022)
Article
Biotechnology & Applied Microbiology
Jinliang Xu, Qingjie Cui, Cuina Bu, Sherif Ismail, Shou-Qing Ni
Summary: This study evaluated the microbial community of different types of sludge in a full-scale sidestream partial nitrification-anammox plant to understand the separation mechanism of anammox and nitrifiers. Suspended sludge showed higher partial nitrification capacity while biofilm sludge had higher anammox activity. High-throughput results revealed that Nitrosomonas was the main active ammonia-oxidizing bacteria in suspended sludge, and Candidatus Brocadia had the highest abundance in biofilm sludge.
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2022)
Article
Biotechnology & Applied Microbiology
Kuo Zhang, Xinjue Li, Shou-Qing Ni, Sitong Liu
Summary: The study investigated the impact of different carrier materials on nitritation performance, finding that the Sepiolite nonwoven composite carrier significantly inhibits nitrite-oxidizing bacteria, improving the efficiency of the nitritation process and holding significant importance for mainstream wastewater treatment.
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2022)
Article
Engineering, Environmental
Yiyi Zhao, Qianxia Li, Qingjie Cui, Shou-Qing Ni
Summary: This study constructed three organic substances supported DNRA systems in a membrane bioreactor and investigated the effect of different COD/N ratios on ammonium nitrogen transformation efficiency and microbial community diversity. The results showed that the ethanol-supported DNRA system at a COD/N ratio of 7.7 had the highest ammonium nitrogen transformation efficiency and nrfA gene abundance, and contained a large number of fermenting bacteria. In addition, potential metabolic pathways of three carbon sources were predicted.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Environmental Sciences
Lingrui Kong, Yiming Feng, Jingqi Sun, Kaiyu Rong, Jianhang Zhou, Ru Zheng, Shouqing Ni, Sitong Liu
Summary: Co-cultivation of two algae taxa, Chlorella sp. and Phormidium sp., in photobioreactors showed a cooperative relationship with cross-feeding and resulted in higher protein production and nitrogen removal rate compared to individual cultures. The study highlights the importance of algal interspecies interaction in algae-based wastewater treatment.
ENVIRONMENTAL RESEARCH
(2022)
Article
Environmental Sciences
Yiyi Zhao, Fang Yuan, Shaoyong Li, Jinpeng Zhang, Yuze Li, Xiang Shi, Jiachun Yang, Shou-Qing Ni, Sherif Ismail
Summary: This study explores the assembly mechanisms and co-occurrence patterns of DNRA microbial communities and the impact of nitrate reduction in Songhua River Basin. The results indicate that DNRA microbial communities are influenced by environmental factors and stochastic processes, with the Geobacteraceae playing a key role in DNRA and the overall bacterial community.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Environmental Sciences
Zheng Guo, Hafiz Adeel Ahmad, Yuhe Tian, Qingyu Zhao, Ming Zeng, Nan Wu, Linlin Hao, Jiaqi Liang, Shou-Qing Ni
Summary: This study analyzed the effects of graphene oxide (GO) and reduced graphene oxide (RGO) on anammox and found that different concentrations of graphene oxide have different impacts on the anammox process. 100 mg/L of GO significantly promoted anammox, while 200 mg/L of GO inhibited the process. The promotion effect of RGO was temperature-dependent, and RGO showed a more significant positive correlation with nitrogen removal efficiency and specific anammox activity. Spearman correlation analysis also revealed a positive correlation between the addition of graphene oxides and the abundance of Planctomycetes and Nitrospirae.
Article
Environmental Sciences
Zhibin Wang, Pengpeng Liu, Jing Zhou, Sherif Ismail, Shakeel Ahmad, Hanem M. M. Awad, Shou-Qing Ni
Summary: This study used biomagnetic effect to promote anammox process. Batch tests and long-term experiments showed that an appropriate electromagnetic field (EMF) strength can improve the nitrogen removal performance of anammox, but higher strengths can inhibit the activity of anammox bacteria. The addition of EMF with an appropriate strength greatly improved the nitrogen removal performance of granular sludge. The study also found that EMF addition can increase the relative abundance of the main anammox bacteria.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2022)
Article
Environmental Sciences
Zhibin Wang, Jinpeng Zhang, Jing Zhou, Sherif Ismail, Hafiz Adeel Ahmad, Hanem M. Awad, Ahmed Tawfik, Shou-Qing Ni
Summary: Laboratory-scale bioreactors were used to study the effect of dimethyl sulfoxide (DMSO) on the start-up, pollutant removal efficiency, and microbial community of nitrification. DMSO concentrations above 2% had a significant inhibitory effect on the nitrification process. The microbial community was significantly different at high DMSO concentrations, with key classes changing from Blastocatellia and Clostridia to Actinobacteria and Acidobacteria.
Article
Engineering, Environmental
Zhibin Wang, Cuina Bu, Jianghai Dou, Sherif Ismail, Shakeel Ahmad, Daqian Qi, Haiwei Wei, Xue Chen, Taeho Lee, Ahmed Tawfik, Shou-Qing Ni
Summary: In this study, an anammox coupled DNRA system was constructed to achieve efficient nitrate to ammonia conversion under high C/N ratio environment. DNRA bacteria were enriched and accounted for 20% of total bacteria population, while a small amount of anammox bacteria were detected. This study demonstrates the reproducibility of natural processes and provides insights into enhancing nitrogen removal rates.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Engineering, Environmental
Sherif Ismail, Mohamed Elsamadony, Mohnad Abdalla, Shou-Qing Ni, Ahmed Tawfik
Summary: This study investigated the synergistic impact of Tween 80 (T80) and reduced graphene oxide (RGO) on the codigestion process of food waste and biscuit wastewater. The T80/RGO-amended reactor showed a significant increase in hydrogen yield and enzyme activity, as well as stimulation of microbial community. Molecular docking analysis suggested potential interactions between T80, RGO, and hydrogenase protein as active site targets.
ACS ES&T ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Qing Yang, Shaoying Zhang, Shouqing Ni, Yongchao Lai, Jinhua Zhan
Summary: This study proposes a filtration-based SERS method for sensitive and selective analysis of consumer goods containing silver nanoparticles (AgNPs). By adding Raman probe molecules and using an iodide-modified silver nanowire membrane as a filter, AgNPs can be separated and enriched, and quantification can be achieved through a linear relationship between signal intensity and concentration. The method can detect and identify different types of AgNPs, and has been successfully applied to the detection of AgNPs in antibacterial products.
ENVIRONMENTAL SCIENCE-NANO
(2022)
Article
Environmental Sciences
Zhibin Wang, Hafiz Adeel Ahmad, Zhao-Jie Teng, Meiling Sun, Sherif Ismail, Zhuangming Qiao, Shou-Qing Ni
Summary: Similar to denitrification and anammox, DNRA is widely distributed in natural ecosystems, but often underestimated or ignored in WWTPs. A study on a full-scale SNAD WWTP revealed the coexistence of ammonia oxidizing bacteria, anammox bacteria, nitrite oxidizing bacteria, denitrifying bacteria, and DNRA organisms, with a higher relative abundance of the DNRA functional gene. The unintended selection of DNRA in the SNAD process created an engineering inefficiency of nitrogen removal by utilizing carbon that should be allocated for denitrification.
Article
Environmental Sciences
Jianyuan Zhen, Yiyi Zhao, Xuefeng Yu, Wenshan Guo, Zhuangming Qiao, Sherif Ismail, Shou-Qing Ni
Summary: The combination of partial nitrification, nitrite-denitrifying phosphorus removal, and simultaneous nitrification-endogenous denitrification showed high efficiencies in COD, nitrogen, and phosphorus removal. It provided an economic and technical alternative for treating wastewater with high levels of C, N, and P, reducing costs and carbon demand.
