Article
Environmental Sciences
Qi Shi, Zhuo Chen, Han Yan, Meiying Xu, Ke-Fan Cao, Yu Mao, Xiaowen Chen, Hong-Ying Hu
Summary: Ozone and chlorine are widely used disinfectants for water and wastewater disinfection. This study investigated the changes in bacterial community during ozone and chlorine disinfection in reclaimed water, and identified the typical disinfection residual bacteria (DRB) for each disinfectant. The findings highlight the importance of considering microbial safety after disinfection for sustainable water reclamation and reuse.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Engineering, Environmental
Weiying Li, Yu Tian, Jiping Chen, Xinmin Wang, Yu Zhou, Nuo Shi
Summary: This study explored the independent and synergistic effects of chlorine and microorganisms on pipeline corrosion in drinking water distribution systems. The presence of both chlorine and iron-oxidizing bacteria (IOB) resulted in synergistic and antagonistic effects on corrosion. Chlorine affected the biofilm and led to a decrease in microbial biomass over time.
FRONTIERS OF ENVIRONMENTAL SCIENCE & ENGINEERING
(2022)
Article
Environmental Sciences
Ke-Fan Cao, Zhuo Chen, Qi Shi, Yin-Hu Wu, Yun Lu, Yu Mao, Xiao-Wen Chen, Kuixiao Li, Qi Xu, Hong-Ying Hu
Summary: This study compared the inactivation efficiency of E.coli by single ozone, single chlorine, and sequential ozone-chlorine disinfection approaches. It was found that sequential ozone-chlorine disinfection could completely inactivate microorganisms and improve the efficiency of chlorination. By establishing a model to estimate the inactivation rate, the study provided informative insights for optimizing the disinfection units of WRPs.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Engineering, Environmental
Ke-Fan Cao, Zhuo Chen, Yi-Ge Sun, Bang-Hao Huang, Qi Shi, Yu Mao, Yin-Hu Wu, Yun Lu, Hong-Ying Hu
Summary: The ozone-ultraviolet (UV)-chlorine process is a highly effective method of disinfection in water reuse system, but currently still lacks precise quantification and accurate control. In this study, a dosage optimization model for ozone-UV-chlorine synergistic disinfection process was proposed, which was able to determine the cost-effective doses of disinfectants under various constraints.
Article
Green & Sustainable Science & Technology
Shenqun An, Ying Song, Qiang Fu, Rong Qi, Zehao Wu, Feiyang Ge, Xiaoqian Lu, Wei An, Wenxuan Han
Summary: Reclaimed water is increasingly used to address the water resource crisis caused by accelerated urbanization worldwide. Although it enriches aquatic ecosystems with organic matter, nitrogen, and phosphorus, its impact on the self-purification capacity of receiving waters remains poorly understood. This study evaluated the effects of reclaimed water use on water quality, sedimentary bacterial diversity, community structure, and function. The results showed that reclaimed water improved water quality, increased bacterial abundance, and enhanced the carbon, nitrogen, and phosphorus removal functions of polluted waters. These findings contribute to a better understanding of the ecological impact of reclaimed water on urban aquatic ecosystems and inform the rational use of reclaimed water in urban rivers.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Chemistry, Multidisciplinary
Gang Liu, Yun Lu, Liangliang Shi, Mengyu Zhang, Menghao Chen
Summary: The increasing use of reclaimed water in urban areas raises health concerns. This study found that sufficient chlorination can reduce the pulmonary damage caused by reclaimed water and prevent acute and subchronic health effects. It also suggests that endotoxin activity should not be used as an index for toxicity control.
ENVIRONMENTAL CHEMISTRY LETTERS
(2022)
Article
Environmental Sciences
Ziyao Wei, Yingnan Lai, Wenjing Li, Xiaochun Cui, Dandan Zhou, Chaofan Zhang, Congli Chen, Yuanping Fang
Summary: This study investigates the effects of reclaimed water containing chlorite on soil microorganisms by simulating subsurface infiltration. It was found that chlorite enhances the conversion of nitrate nitrogen to nitrite nitrogen but inhibits further conversion. Chlorite also induces oxidative stress reactions in cells and inhibits the production of EPSs. Additionally, chlorite leads to the enrichment of efflux resistance genes in the microbial community. This study provides important information for the management and reuse of reclaimed water.
Article
Environmental Sciences
Peng Qi, Tong Li, Chun Hu, Zesong Li, Zhihao Bi, Youyi Chen, Huishan Zhou, Ziliang Su, Xinjun Li, Xueci Xing, Chaoxiang Chen
Summary: This study investigated the effects of cast iron pipe corrosion on the formation of nitrogenous disinfection by-products (N-DBPs) in drinking water distribution systems (DWDSs). The results showed a significant increase in typical N-DBPs in the effluent of corroded DWDSs, along with higher levels of dissolved organic carbon, adenosine triphosphate, and iron particles. Corroded cast iron pipes altered the microbial community structure and metabolic functions in DWDSs, resulting in enhanced N-DBPs formation.
Article
Chemistry, Physical
Marcin Stawarz, Pawel M. Nuckowski
Summary: This study investigates the corrosion resistance of SiMo ductile iron and the formation process of corrosion layer, demonstrating the beneficial effect of molybdenum in inhibiting corrosion processes by creating a tight oxide coating.
Article
Engineering, Environmental
Wenran Du, Jiawen Wang, Xiaohui Zhao, Enhang Liang, Jinxi He, Lingrui Kong, Pinggui Cai, Nan Xu
Summary: This study systematically investigated the responses of bacteria and algae in the urban Chaobai River to the recharge of reclaimed water. The findings showed that reclaimed water improved the water quality of the receiving water and influenced the network complexity of bacterial and algal communities. Algae were more sensitive to environmental changes and their variations further affected bacterial dynamics.
Article
Environmental Sciences
Yu Mao, Zhuo Chen, Yun Lu, Ke-Fan Cao, Yin-Hu Wu, Hong-Ying Hu
Summary: This study systematically investigated the effects of pH, organic matters, and inorganic ions on Fe(VI) disinfection. Results showed that pH was the dominant influencing factor, and organic matters and inorganic ions had different effects on the inactivation of Escherichia coli.
ENVIRONMENTAL POLLUTION
(2024)
Article
Engineering, Environmental
Min Tang, Darren Lytle, Jacob Botkins
Summary: This study found that old cast iron pipe scale can efficiently accumulate and release arsenic in simulated drinking water, with the addition of phosphate causing a rapid increase in release rate. It is recommended to conduct regular sampling for arsenic in the distribution systems following changes in phosphate corrosion control treatments to identify risks.
Article
Environmental Sciences
Yin-Hu Wu, Yun-Hong Wang, Song Xue, Zhuo Chen, Li-Wei Luo, Yuan Bai, Xin Tong, Hong-Ying Hu
Summary: Chlorine disinfection was found to significantly increase the risks of antibiotic resistant genes (ARGs) in reverse osmosis (RO) systems. These ARGs were mainly enriched in a few bacterial genus, suggesting potential impacts on water quality safety.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Environmental
Daniel Ma, Mark H. Weir, Natalie M. Hull
Summary: Ultraviolet disinfection is a promising solution for decentralized drinking water systems, but photorepair of pathogens after UV disinfection poses a health risk. This study constructed a quantitative microbial risk assessment (QMRA) for photorepair after UV disinfection of drinking water in a decentralized system. The risk of infection was found to be below 1-in-10,000 under certain conditions. The model can be expanded to other pathogens and used to inform the placement of community water access points to reduce photorepair risk and ensure safe storage of UV disinfected water.
Article
Environmental Sciences
Shufeng Lin, Wenhai Chu, An Liu
Summary: Reclaimed water and stormwater are important alternative water sources for mitigating water resource shortage. They have different characteristics of dissolved organic matter (DOM), with reclaimed water having higher DOC concentrations and more hydrophobic properties. Reclaimed water primarily contains SMPs-like and humic acid-like substances, while stormwater runoff primarily contains humic acid-like DOM. Reclaimed water has relatively higher formation potential of disinfection by-products (DBPs), while rainwater has the lowest formation potential.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Review
Green & Sustainable Science & Technology
Bin Yang, Jiemei Liu, Yawei Song, Ning Wang, Han Li
Article
Engineering, Environmental
Jia Meng, Haoran Duan, Huijuan Li, Shane Watts, Peng Liu, Sohan Shrestha, Min Zheng, Wenbo Yu, Zhongwei Chen, Yarong Song, Jason Dwyer, Shihu Hu, Zhiguo Yuan
Article
Engineering, Environmental
Yue Hu, Ding Dong, Kun Wan, Chao Chen, Xin Yu, Huirong Lin
Summary: This study found that after switching to a high-quality water source, the level of culturable bacteria decreases significantly, leading to a change in the bacterial community structure, with some bacterial genera becoming dominant. Although corrosion-inhibiting bacteria decrease after switching, they still dominate in the three reactors. In addition, potential opportunistic pathogens were detected.
FRONTIERS OF ENVIRONMENTAL SCIENCE & ENGINEERING
(2021)
Article
Environmental Sciences
Jiaxing Zhang, Tahir Maqbool, Yu Qiu, Yanling Qin, Muhammad Bilal Asif, Chao Chen, Zhenghua Zhang
Summary: The study investigated the presence of carcinogenic N-nitrosamines and dissolved organic matter (DOM) in four reservoirs in a southern Chinese city. It found that industrial and pharmaceutical-origin precursors dominated the N-nitrosamines distribution, with traces of pesticide-based precursors also present. The distribution of N-nitrosamines varied among the reservoirs, with certain compounds found abundantly in all reservoirs. Additionally, anthropogenic activities were identified as the primary source of DOM and N-nitrosamines in the city based on land-use analysis.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Water Resources
Chao Chen, Keith Hayward, Stuart J. Khan, Banu Ormeci, Sudhir Pillay, Joan B. Rose, Joseph Thanikal, Tong Zhang
Summary: The International Water Association established a Task Force in 2020 to provide knowledge on COVID-19 control for water professionals and industries worldwide. The Task Force aims to offer guidance on risk management and response to global virus outbreaks, with a focus on understanding and controlling the impact of the pandemic.
WATER QUALITY RESEARCH JOURNAL
(2021)
Article
Environmental Sciences
Xiao Li, Er Bei, Yu Qiu, Hao Xiao, Jun Wang, Pengfei Lin, Xiaojian Zhang, Chao Chen
Summary: This study calculated the intake of NDMA, NDEA, and TVNA by Chinese residents in different provinces, finding large differences in nitrosamine intake and identifying vegetables, cereals, aquatic products, and meats as main contributors. Drinking water was estimated to contribute to nitrosamine intake, with a recommendation to set NDMA drinking water standard.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Xiaobin Liao, Linlu Shen, Zhibin Jiang, Menglan Gao, Yu Qiu, Huan Qi, Chao Chen
Summary: This study revealed that metformin can directly form NDMA during ozonation, with the addition of ·OH scavenger enhancing its formation significantly. The impacts of bromide and HCO3- on NDMA formation by O3 and ·OH were different, the increase in pH promoted NDMA production.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Menglan Gao, Zhibin Jiang, Xiaobin Liao, Huan Qi, Lei Zhao, Chao Chen, Danielle Westerman
Summary: This study investigated the characteristics, kinetic rates, reaction pathways, and influencing factors of the formation of N-Nitrosodimethylamine (NDMA) during ozonation, using 3-(Dimethylamino)-1-propylamine (DMAPA) as a representative. The results showed that NDMA was generated directly from DMAPA during ozonation, and its yields increased with ozone dosages. The pH, hydroxyl radical (•OH), bromide ion (Br-), NO2-, NH4+, NO3-, and co-existing components in actual lake water all affected the formation of NDMA. The primary pathway for NDMA formation was found to be radical recombination.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Review
Environmental Sciences
Xiuli Chen, Yuyin Yang, Yanchu Ke, Chao Chen, Shuguang Xie
Summary: The biodegradation of tetracyclines (TCs) is crucial in removing antibiotic pollution from the environment. Cultivation-based techniques can isolate microorganisms with degradation ability, and chemical analysis and molecular biology techniques help reveal the degradation mechanisms to assess ecological risks.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Jianfei Chen, Yuyin Yang, Yanchu Ke, Xiuli Chen, Xinshu Jiang, Chao Chen, Shuguang Xie
Summary: This study utilized DNA-stable isotope probing and metagenomics to investigate the active microorganisms and mechanisms of sulfonamide (SA) biodegradation in antibiotic-contaminated wetland sediments. The results revealed that SA-assimilating bacteria, particularly members of Proteobacteria, played a dominant role in SA degradation. It was found that ipso-hydroxylation was the main process by which both sulfadiazine and sulfamethoxazole were dissipated, and this process was driven by similar microbes. Additionally, some genes encoding dioxygenases were proposed to be involved in SA metabolism. This study provides important insights into the ecological roles of uncultured microorganisms and the in-situ biodegradation mechanisms of SA.
ENVIRONMENT INTERNATIONAL
(2022)
Article
Microbiology
Jianfei Chen, Yuyin Yang, Yanchu Ke, Xiuli Chen, Xinshu Jiang, Chao Chen, Shuguang Xie
Summary: This study investigated the anaerobic degradation activity of sulfonamide (SA) compounds and the associated bacterial community in wetland sediments. The results showed that only sulfamethoxazole (SMX) could be effectively degraded, and the degradation rate was faster in sediments with higher levels of SA contamination. The DNA-stable isotope probing (SIP) technique revealed that the active SMX-degrading bacteria were dominated by Proteobacteria in some sediments and by Firmicutes in others.
ENVIRONMENTAL MICROBIOLOGY
(2022)
Article
Environmental Sciences
Xiuli Chen, Wei Shen, Jianfei Chen, Ying Zhu, Chao Chen, Shuguang Xie
Summary: This study isolated a TC-degrading bacterial strain Alcaligenes sp. T17 and investigated its degradation ability under different conditions. Temperature and pH were found to affect the degradation efficiency. Analysis of degradation products and genomic analysis revealed a possible degradation pathway and functional genes involved in the degradation process.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Environmental
Xiuli Chen, Yanchu Ke, Ying Zhu, Mingbang Xu, Chao Chen, Shuguang Xie
Summary: Two TC-degrading microbial consortia were enriched from activated sludge and soil, showing high degradation capabilities under a wide pH range and at moderate/high temperatures. Metagenomic sequencing revealed genes related to TC biodegradation.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Engineering, Environmental
Lvtong Zhao, Dibo Liu, Haiya Zhang, Jun Wang, Xiaojian Zhang, Shuming Liu, Chao Chen
Summary: Iron release from pipe scale is a major cause of water quality deterioration in drinking water distribution systems worldwide. This study aimed to investigate the reduction of ferric components in pipe scale under anoxic conditions using new investigation approaches such as electrode pairs and novel simulating reactors. The results showed that iron oxide scale can indeed be reduced under anoxic conditions. The study also revealed the electrochemical reaction mechanisms of pipe scale disruption.
Article
Engineering, Environmental
Yu Qiu, Er Bei, Xiao Li, Shuguang Xie, Hao Xiao, Yihua Luo, Yu Wang, Jun Wang, Xiaojian Zhang, Chao Chen
Summary: The study identified textile printing and dyeing wastewater and electroplating industrial wastewater as important sources of nitrosamines in an urban area. It was found that upstream surface water and local wastewater discharges were major contributors to downstream source water, with endogenous formation potentially playing a significant role as well. This research provides a method for quantitatively evaluating the contribution of nitrosamines from different contamination sources to urban water supply.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
