Article
Environmental Sciences
Byran C. Fuhrmann, Marc W. Beutel, Peggy A. O'Day, Christian Tran, Andrew Funk, Sarah Brower, Jeffery Pasek, Mark Seelos
Summary: This study investigated the seasonal patterns of MeHg cycling in a sulfate-rich, hypereutrophic reservoir using microcosm incubations. Results showed that aeration and SRB inhibitor decreased MeHg concentration, while methanogenic inhibitor increased MeHg concentration. The addition of organic carbon and microbial inhibitors also had significant impacts on MeHg concentration.
ENVIRONMENTAL POLLUTION
(2021)
Article
Environmental Sciences
Geoffrey Millard, Chris S. Eckley, Todd P. Luxton, David Krabbenhoft, Jennifer Goetz, John McKernan, John DeWild
Summary: This study measured mercury methylation and demethylation rates using stable isotope tracers in sediments and water of a shallow branch of the Nacimiento Reservoir. The results showed high methylmercury concentrations in the hypolimnetic waters and higher methylation rates in littoral sediments during late summer. Modelled results indicated that the remaining hypolimnetic methylmercury could originate from profundal sediments, highlighting the importance of addressing methylation in both the water column and sediment for remediation strategies.
ENVIRONMENTAL POLLUTION
(2023)
Article
Limnology
Byran Fuhrmann, Marc Beutel, Priya Ganguli, Liying Zhao, Sarah Brower, Andrew Funk, Jeffrey Pasek
Summary: This study tracked the cycling of MeHg in the sediment of hypereutrophic Hodges Reservoir in the United States, identifying spring and fall as hot moments for MeHg entry into the water column, which can potentially be managed to reduce mercury bioaccumulation through approaches such as oxygenation.
LAKE AND RESERVOIR MANAGEMENT
(2021)
Article
Environmental Sciences
R. P. Mason, M. Coulibaly, G. Hansen, H. Inman, P. K. Myer, K. M. Yao
Summary: Artisanal and small-scale gold mining, energy production, and other industrial inputs are a major source of anthropogenic mercury in aquatic environments. This study focuses on the understudied estuarine waters of Cote d'Ivoire and suggests that the local population may be exposed to unsafe levels of methylmercury through fish consumption. The findings highlight the importance of addressing local sources of mercury contamination and the transportation of mercury used in gold mining activities.
Article
Environmental Sciences
Shuhan Xin, Bingbing Wang, Yin Yuan, Shiliang Wang
Summary: The study measured the content of total mercury (THg) and methylmercury (MMHg) in Nansi Lake and its inflow river estuaries, and investigated their spatial distribution characteristics and geochemical relationships with sediment mineral phases. The THg and MMHg contents in the lake sediment were lower than those in the inflow river estuary sediment, indicating that the inflow rivers are the primary source of THg and MMHg in Nansi Lake. The distribution of THg and MMHg showed different spatial variations in the sediment, and their relationships with sediment characteristics differed between the estuary and lake sediment.
Article
Engineering, Environmental
Chenghao Yu, Maodian Liu, Junming Guo, Huiming Lin, Yunyun Yan, Qianru Zhang, Menghan Cheng, Yifan Lu, Xuejun Sun, Xuejun Wang, Xiangliang Pan
Summary: The Yellow River, a high-sediment river, releases significant amounts of mercury and methylmercury into the Bohai Sea. Sediment regulation can increase mercury flux to the ocean, while water diversion has a minimal impact on mercury flux. This study highlights the importance of understanding mercury transport and its impacts on coastal ecosystems.
Article
Engineering, Environmental
Laurie A. Hall, Isa Woo, Mark Marvin-DiPasquale, John Y. Takekawa, David P. Krabbenhoft, Donald Yee, Letitia Grenier, Susan E. W. De La Cruz
Summary: Differences in sediment biogeochemistry among tidal marsh features can result in spatial variation in MeHg production. The MeHg concentrations in sediments and water do not necessarily match those in consumer tissues, possibly due to differences in behavior and physiology among consumers.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Marine & Freshwater Biology
Yongjie Wang, Zhigang Wang, Xiangmin Zheng, Limin Zhou
Summary: The study found that the invasion of Spartina alterniflora facilitates mercury storage in wetland sediments, affects sulfur cycling, but has similar effects on MeHg production compared to native plants in the Yangtze River estuarine wetlands.
ESTUARINE COASTAL AND SHELF SCIENCE
(2022)
Article
Environmental Sciences
Chenghao Yu, Wenjie Xiao, Yunping Xu, Xuejun Sun, Mingyue Li, Huiming Lin, Yindong Tong, Han Xie, Xuejun Wang
Summary: Mercury, especially in the form of methylmercury, is a global pollutant with aquatic products being a major source of human exposure. The Bohai and Yellow seas in China have experienced an increase in THg levels over the years with a decrease in Yellow River THg input. Higher MeHg levels were found in surface sediments of the Bohai and Yellow seas compared to the East China Sea, with extremely high levels in the Yellow Sea Cold Water Mass area, suggesting potential ecological and human health risks in the region.
Article
Environmental Sciences
Dhiraj Kumar Chaudhary, Hem Prakash Karki, Rishikesh Bajagain, Hwansuk Kim, Tae Siek Rhee, Jong Kuk Hong, Seunghee Han, Young-Gyun Choi, Yongseok Hong
Summary: This study measured total mercury (THg), methylmercury (MeHg), various trace elements, and microbial communities in surface sediments of the East Siberian Sea (ESS). The results showed elevated levels of THg and MeHg, as well as trace elements like Al, Fe, and Mn. Both natural phenomena and human activities contributed to the metal concentrations in the ESS. The distribution of THg and MeHg was influenced by redox proxy metals, pH, and SO42-. Microbial profiles were significantly affected by metals and other abiotic factors, with Proteobacteria and Thaumarchaeota being the most abundant phyla.
MARINE POLLUTION BULLETIN
(2022)
Article
Environmental Sciences
Karin Eklof, Patrick Drohan, Joseph Needoba, Sally Landefeld, Tawnya D. Peterson, Haiyan Hu, Lidiia Iavorivska, Elizabeth W. Boyer
Summary: This study found that concentrations of MeHg in subaqueous soils increased by a factor of 2.74 on average after the lakebed was re-flooded, with substantial variability among sampling sites. Compared to studies evaluating soil MeHg after initial flooding, the increase in MeHg production after re-flooding was lower, indicating a smaller response in MeHg production on a former lake bed.
ENVIRONMENTAL RESEARCH COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Ying-Jie Li, Qi Lin, Zheng-Hua Zhang, Tai-Bao Wei, Bingbing Shi, Hong Yao, You-Ming Zhang
Summary: Numerous new methods have been developed for synthesizing novel nanomaterials with unique functions. One novel strategy involves forming fluorescent nanoparticles in situ, which can efficiently sense Hg2+ in living cells and separate Hg2+ from water.
Article
Environmental Sciences
Dhiraj Kumar Chaudhary, Mark Xavier Bailon, Hwansuk Kim Bullet, Danny Reible Bullet, Yongseok Hong
Summary: This study investigated the effectiveness of in situ sediment capping as a remediation option for mercury-contaminated sediments in the Hyeongsan River estuary, South Korea. The results showed that using activated carbon and zeolite as sorbents, as well as sand as a passive cap, can potentially reduce the concentrations of total mercury and methylmercury in sediments.
JOURNAL OF SOILS AND SEDIMENTS
(2022)
Article
Geosciences, Multidisciplinary
Huifang Zhao, Guangyi Sun, Zhonggen Li, Leiming Zhang, Xinbin Feng, Xinyu Li, Tingting Wu
Summary: The study in Northeast China revealed that the reclamation of marsh wetlands 50-60 years ago led to a significant input of mercury into a reservoir, while the weakening of agricultural activities in later decades resulted in less mercury input, indicating that Hg isotope signatures can reflect landscape changes.
Article
Environmental Sciences
Xiaoyu Xu, Albert L. Bryan, Jasmine R. Parks, Kara N. Gibson
Summary: This study investigated the deposition and accumulation of mercury in a stream ecosystem. The results showed a correlation between labile mercury in porewater and bioaccumulative mercury in biota. The study found that surface sediment had higher mercury concentrations, and most of the sediment mercury existed in non-labile forms. Additionally, sulfate levels influenced mercury methylation and methyl-mercury production in the sediment. Methyl-mercury concentrations in the aquatic food web increased with trophic levels.
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.
