Article
Environmental Sciences
Rong Xiang, Lijing Wang, Hong Li, Zebin Tian, Binghui Zheng
Summary: The overall water quality of the Three Gorges Reservoir was good, but showed a slight decline before full impoundment. The low water level period had the worst water quality, and the midstream area exhibited the poorest water quality. Total nitrogen and total phosphorus were identified as key pollution indices.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Kun Lv, Xiaojuan Guo, Congfeng Wang, Qingqing Su, Defu Liu, Shangbin Xiao, Zhengjian Yang
Summary: Nitrogen pollution in reservoir ecosystems is a serious environmental issue, and microbial-mediated nitrogen cycling in sediments plays a critical role in nitrogen removal. Enhancing sediment denitrification and replenishing dissolved oxygen and nitrate is expected to strengthen the environmental self-purification process in aquatic ecosystems.
ENVIRONMENTAL POLLUTION
(2022)
Article
Environmental Sciences
Kai Wang, Yu Pang, Chen He, Penghui Li, Shangbin Xiao, Quan Shi, Ding He
Summary: Hydrological alterations induced by Three Gorges Reservoir construction resulted in variations in DOM molecular composition between reservoir area and non-reservoir area in the Xiangxi tributary. Water intrusion from mainstream to tributaries was found to be the main factor controlling DOM variation, highlighting the important role of reservoir in DOM cycling.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Shiyao Zhang, Yuhong Zeng, Wei Zha, Shouliang Huo, Lanhua Niu, Xiaofeng Zhang
Summary: The impoundment of the Three Gorges Reservoir and upstream cascade reservoirs has significantly impacted the phosphorus transport processes, leading to decreased suspended sediment concentration and changes in phosphorus fractions. However, there are seasonal variations and differences in correlations between the impoundment periods.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Engineering, Environmental
Xiaojuan Guo, Jia Liu, Defu Liu, Zhengjian Yang, Shangbin Xiao, Andreas Lorke
Summary: Reservoirs are significant sources of nitrous oxide, but there is limited understanding of N2O emissions from the world's largest reservoirs. A study on a tributary bay of Three Gorges Reservoir found that N2O emissions were reduced after impoundment, highlighting the importance of hydraulic conditions on N2O emissions from large reservoirs.
Article
Environmental Sciences
Bingyuan Tan, Pengfei Hu, Xiaoxu Niu, Xing Zhang, Jiakun Liu, Thijs Frenken, Paul B. Hamilton, G. Douglas Haffner, S. Rao Chaganti, Amechi S. Nwankwegu, Lei Zhang
Summary: The microbial food-loop is critical for energy flow in aquatic food webs. This study tracked the response of the microbial community during a 7-day algal bloom event in the Three Gorges Reservoir in May 2018 and found that both the algal bloom and a storm event significantly modified the composition and relative abundance of species in the microbial community.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Civil
Haochen Yan, Xiaofeng Zhang, Quanxi Xu
Summary: This study reveals the impact of upstream cascade reservoirs on the annual runoff and sediment load inflows to the Three Gorges Reservoir (TGR). The results show that precipitation dominated the runoff change, while human activities were the main driving factors for sediment load reduction in the studied area. Sediment retention induced by large reservoirs in the upstream of TGR was identified as the major reason for sediment load reduction. The unprecedented situation in the upper Yangtze River Basin may have profound impacts on the morphology and ecology of TGR and the downstream Yangtze River.
JOURNAL OF HYDROLOGY
(2021)
Article
Environmental Sciences
Bei Zhou, Kongxian Zhu, Yonghong Bi, Bernhard Henkelmann, Silke Bernhoeft, Wujuan Mi, Karl-Werner Schramm
Summary: This study collected sediment cores from the Xiangxi River and measured the deposition time and concentrations of PCDD / F using radiometry and chemical analysis. The results showed that the mean deposition rate was 1.01 cm/a. The concentrations of PCDD/Fs varied significantly in different layers and cores, with higher concentrations in the 1960-1990s. PCDD accounted for 63.42-87.33% of PCDD/Fs, and the predominant congener was OCDD. The study concluded that the spatio-temporal heterogeneity and total organic carbon influenced the distribution pattern of PCDD/Fs in the sediment cores. The concentrations of PCDD/Fs were low, indicating a low environmental pollution risk. The main source of contamination may be by-products of sodium pentachlorophenate.
Article
Engineering, Civil
Peiyao Li, Ye Yao, Jijian Lian, Chao Ma
Summary: The study revealed that after the impoundment of Three Gorges Reservoir, algal blooms frequently occurred in its tributaries, especially the Xiangxi River. The complex hydrodynamic environment of the Xiangxi River was found to be influenced by thermal stratified flows, which affected the transport of algae. Different patterns of thermal stratified flows led to variations in the direction and concentration of algae transport.
JOURNAL OF HYDROLOGY
(2021)
Article
Engineering, Environmental
Zhaoming Chen, Mingquan Shi, Jinsong Zou
Summary: This study proposes a novel method to assess the eutrophication status of the tributaries of the Three Gorges Reservoir in China by adjusting indicator weights using the analytic hierarchy process-entropy weight method and improving the fuzzy operation method. The method provides a comprehensive evaluation of the eutrophication status, with the results indicating that Hanfeng Lake is generally in a light eutrophication state and the Nanhe River is in a relatively high degree of eutrophication. The evaluation results are more realistic and provide guidance for comprehensive management of eutrophication.
WATER ENVIRONMENT RESEARCH
(2021)
Article
Green & Sustainable Science & Technology
Qianzhu Zhang, Ke Jin, Linyao Dong, Ruiyi Zhao, Wenxiang Liu, Yang Lu, Xiaoqing Gan, Yue Hu, Cha Zhao
Summary: Riverine dissolved matter provides important geochemical information for understanding and managing water environment. The study on the Ganjing River reveals high levels of dissolved solids, mainly due to carbonate weathering. The contribution of atmospheric rainfall is relatively low, while anthropogenic activities, especially in the reservoir area, have a significant impact. The rates of rock weathering and CO2 consumption highlight the challenges of integrated water resource management in reservoir areas.
Article
Engineering, Civil
Tianyang Li, Binghui He, Yuqi Zhang, Shi Fu, Yi Zhang, Xunjian Long
Summary: The stoichiometric coupling of dissolved silica (DSi) and bicarbonate (HCO3-) in lakes is regulated by chemical weathering and algal activity, with the dynamics influenced by hydrological conditions and water quality variables. Changes in DSi and HCO3- show spatial and temporal patterns in different zones of the lake, with significant effects of biological activity, water level fluctuations, and pollution discharge on silicon and carbon coupling.
JOURNAL OF HYDROLOGY
(2021)
Article
Green & Sustainable Science & Technology
Aifeng Zhai, Baodeng Hou, Xiaowen Ding, Guohe Huang
Summary: A new program for predicting water pollution accidents in drinking water sources has been developed, showing that larger discharge flows can reduce the impact of accidents and improve water quality. This study provides decision makers with a tool to predict the diffusion and migration of pollutants in drinking water sources.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Multidisciplinary Sciences
Wenning Hou, Haiyan Wang, Yonglin Zheng, Yige Wang, Dandan Yang, Hai Meng
Summary: This study analyzed the seasonal variation characteristics of COD, TN, and TP concentrations in the upstream and downstream of the Sunxi River watershed. The results showed that the concentrations were significantly higher in the downstream. In terms of seasons, COD had the highest concentration in summer, while TN and TP concentrations were higher in spring and summer and lower in autumn. Path analysis revealed that electrical conductivity and dissolved oxygen directly affected TN concentrations, while water temperature indirectly affected TN concentrations through the effects of electrical conductivity and dissolved oxygen. The water quality in the upstream was better, and the water quality in autumn was better than in spring and summer. For water quality management and ecological restoration of the Sunxi River watershed, attention should be given to changes in water quality in the downstream, especially in spring and summer, and the impact of water temperature, electrical conductivity, and dissolved oxygen.
Article
Water Resources
Xiaoxiao Wang, Haijian Bing, Yanhong Wu, Jun Zhou, He Zhu, Yong Wu, Hongyang Sun
Summary: The study revealed heterogeneous variations in major ions, nutrients, and heavy metals concentrations in the Three Gorges Reservoir, with Chongqing downtown identified as a hotspot for pollutants. The findings also showed a decreasing trend in pollution levels from Chongqing towards the reservoir dam. The study highlighted the combined influences of natural processes, intense rainfall, and human activities on water quality variations in large reservoirs like the Three Gorges Reservoir.
JOURNAL OF WATER AND CLIMATE CHANGE
(2021)
Article
Engineering, Environmental
Rong-Gui Zhu, Chang-Gui Pan, Feng-Jiao Peng, Chao-Yang Zhou, Jun-Jie Hu, Kefu Yu
Summary: This comprehensive survey investigated the occurrence, bioaccumulation, and trophic magnification of parabens and their metabolite 4-HB in a marine food web. Results showed that parabens were the predominant pollutants in marine organisms, with significant bioaccumulation from sediments. The estimated trophic magnification factor indicated biomagnification for MeP and trophic dilution for 4-HB. Overall, the risks for humans consuming marine organisms were found to be low.
Article
Engineering, Environmental
Andres F. Torres-Franco, Deborah Leroy-Freitas, Cristina Martinez-Fraile, Elisa Rodriguez, Pedro A. Garcia-Encina, Raul Munoz
Summary: Anaerobic and microalgae-based technologies have emerged as sustainable alternatives for municipal wastewater treatment. However, the presence of viruses in the treated wastewater is a major concern for reuse applications. This study assessed the ability of these technologies to reduce viruses during secondary wastewater treatment. The results showed that all technologies were effective in reducing the concentration of viruses, with microalgae-based treatment exhibiting the highest potential for reducing the disinfection requirements of treated wastewater.
Article
Engineering, Environmental
Young Gwang Kim, Sae Yun Kwon, Spencer J. Washburn, Scott C. Brooks, Ji Won Yoon, Lucien Besnard
Summary: The study uses Hg isotope ratios to identify the sources and exposure pathways of mercury in bivalves, finding that dissolved Hg phases in the water column are the primary source and exposure pathway to bivalves. This provides new insights into using bivalves as bioindicators for sediment quality monitoring.
Article
Engineering, Environmental
Hui Geng, Ying Xu, Rui Liu, Dianhai Yang, Xiaohu Dai
Summary: This study investigates the effect of cation exchange resin (CER) on the sequential recovery of hydrogen and methane from anaerobic digestion (AD) and the corresponding mechanisms. The results show that CER can simultaneously enhance the production of hydrogen and methane by promoting the solubilisation, hydrolysis, and acidification of organic matter. Additionally, CER facilitates effective contact between bacteria and organic particulates and reduces the energy barrier for mass transfer during methane production. The study also reveals changes in the microbial community structure and metagenomics during the AD process.
Article
Engineering, Environmental
Xiaojing Lin, Zhan Jin, Shunfeng Jiang, Zhiquan Wang, Suqing Wu, Ke Bei, Min Zhao, Xiangyong Zheng
Summary: Dehumidification combined with addition of absorbent resin supplement (ARS) was used to achieve rapid evaporation of non-pretreated urine, resulting in high water evaporation efficiency and nutrient recovery.
Article
Engineering, Environmental
Yangli Che, Chaoran Lin, Shen Li, Jiao Liu, Longhai Zhu, Shilei Yu, Nan Wang, Haoshuai Li, Mutai Bao, Yang Zhou, Tonghao Si, Rui Bao
Summary: Hydrodynamic processes play a crucial role in the transmission of sediments, microbial assembly, and organic carbon redistribution in the ocean. Through experiments and analysis, we found that hydrodynamics shape the assembly of microbial communities and control the redistribution of different sourced organic carbon, thereby influencing microbial-mediated biogeochemical transformation.
Article
Engineering, Environmental
Chao Chen, Yu Yang, Nigel J. D. Graham, Zhenyu Li, Xingtao Yang, Zhining Wang, Nadia Farhat, Johannes S. Vrouwenvelder, Li -an Hou
Summary: The fouling of seawater reverse osmosis membranes is a persistent challenge in desalination. This study monitored the operational performance of a desalination plant for 7 years and the fouling development in different areas of membrane modules. The findings showed that operational performance declined over time and fouling mainly occurred at the feed side of the modules, with the highest microbial diversity. Keystone species like Chloroflexi and Planctomycetes played an important role in maintaining community structure and biofilm maturation. Polysaccharides, soluble microbial products, marine humic acid-like substances, and inorganic substances contributed to fouling. Overall, biofouling had a significant impact on membrane fouling after 7 years of operation.
Article
Engineering, Environmental
Dan Li, Jieyi Sun, Yibo Fu, Wentao Hong, Heli Wang, Qian Yang, Junhong Wu, Sen Yang, Jianhui Xu, Yunfei Zhang, Yirong Deng, Yin Zhong, Ping'an Peng
Summary: Sulfidation-oxidation treatment of magnetite (Fe3O4) enhances the production of dark center dot OH, which can efficiently degrade dissolved organic matter (DOM) and accelerate carbon cycling.
Article
Engineering, Environmental
Cheng Yu, Kaijun Wang, Kaiyuan Zhang, Ruiyang Liu, Pingping Zheng
Summary: This study implemented a microaerobic-aerobic configuration in a full-scale municipal wastewater treatment facility and investigated the effects on sludge characteristics, pollutant removal, microbial community, and granulation mechanisms. The results showed successful transition from flocculent-activated sludge to well-defined AGS after two months of operation. The primary pathways for pollutant removal were simultaneous nitrification, denitrification, and phosphorus removal. Moreover, the incorporation of internal separators induced shifts in the flow pattern, which promoted granulation.
Article
Engineering, Environmental
Zhe Zhang, Shaoyang Hu, Guangrong Sun, Wei Wang
Summary: Halogenated aromatic disinfection byproducts (DBPs), such as halogenated phenols, have garnered widespread attention due to their high toxicity and prevalence. This study reports on the analysis, occurrence, and cytotoxicity of a group of emerging halogenated aromatic DBPs, known as halogenated polyhydroxyphenols (HPPs), in drinking water.
Article
Engineering, Environmental
Shengyue Chen, Jinliang Huang, Peng Wang, Xi Tang, Zhenyu Zhang
Summary: Accurate prediction of river water quality is crucial for sustainable water management. This study introduces wavelet analysis and transfer learning techniques to assist LSTM modeling, proposing a newly coupled modeling approach that improves short-term prediction of river water quality.
Article
Engineering, Environmental
Bang Du, Xinmin Zhan, Piet N. L. Lens, Yifeng Zhang, Guangxue Wu
Summary: Efficient anaerobic digestion relies on the cooperation of different microorganisms with different metabolic pathways. This study investigated the effects of different operational modes and the addition of powdered activated carbon (PAC) on ethanol metabolic pathways. The results showed that the SBR mode and the presence of CO2 facilitated ethanol metabolism towards propionate production, while the CFR mode with extended solids retention time enriched Geobacter. Adjusting operational modes and PAC addition can modulate anaerobic ethanol metabolism and enrich Geobacter.
Article
Engineering, Environmental
Wanfa Wang, Si-Liang Li, Jun Zhong, Yuanbi Yi, Fujun Yue, Zenglei Han, Qixin Wu, Ding He, Cong-Qiang Liu
Summary: This study compares the carbon biogeochemical processes in karst and non-karst regions within large thermal stratified river-reservoir systems. The results demonstrate that karst reservoirs have a reduced potential for carbon emissions and highlight the importance of considering geologic settings to improve accuracy in regional and global CO2 emission estimates.
Article
Engineering, Environmental
Chunxia Jiang, Zelong Zhao, Dong Zhu, Xiong Pan, Yuyi Yang
Summary: This study analyzed the occurrence and distribution of antibiotic resistance genes (ARGs) in different environmental media of the Yangtze River using metagenomics. Core resistome dominated by multidrug resistance genes was found in all samples, while rare resistome dominated by various resistance genes was more prevalent in plasmids. Specific bacteria were identified as hosts for both core and rare resistomes, with high clinical concern ARGs found in the rare resistome. Particle-associated environment provided the most ideal conditions for resistome hosts. This study provided insights into the genetic locations of ARGs and the community assembly mechanisms of ARG hosts in freshwater environments.
Article
Engineering, Environmental
Yu Zhang, Yongtao He, Linchun Jia, Lei Xu, Zheng Wang, Yueling He, Ling Xiong, Xumeng Lin, Hong Chen, Gang Xue
Summary: By synergizing organic carbon source, thiosulfate, and zero-valent iron, efficient mixotrophic denitrification of oligotrophic secondary effluent can be achieved. Thiosulfate plays a vital role in promoting TN removal efficiency, while corrosion of Fe0 releases OH- to neutralize H+ from thiosulfate-driven denitrification, creating a suitable environment for denitrification. The coordination of thiosulfate and Fe0 maintains the dominance of Thiobacillus for denitrification.