Review
Environmental Sciences
Qingwei Zhou, Zhengfu Bian, Dejun Yang, Li Fu
Summary: The importance of the stability of drinking water distribution systems and the management of disinfection by-products in ensuring public health safety is discussed in this paper. The interrelationships between corrosion products, microbes, and drinking water quality are explained, along with the mechanisms through which corrosive by-products influence disinfectant decay and harmful by-product formation. Recommendations for removing DBPs are also presented.
Article
Environmental Sciences
Tuqiao Zhang, Kexin Li, Xiaowei Liu
Summary: This study investigated the changes in biofilm DBP formation potential in continuous-flow DWDS subjected to UV-Cl2 treatments. The results showed that the minimum biofilm DBP formation potential was observed at a UV dose of 80 mJ/cm2, and the bacterial community composition and metabolic function were also affected by UV-Cl2 treatment. Additionally, the UV-Cl2 disinfection process led to changes in the water matrix, which influenced the properties of biofilm EPS and DBP formation potential.
ENVIRONMENTAL POLLUTION
(2023)
Article
Environmental Sciences
Tuqiao Zhang, Pubin Liao, Lei Fang, Dongyang Zhang
Summary: The effect of booster disinfection on antibiotic resistance and bacterial community in water supply systems was investigated. Chlorine was more efficient in controlling microbes and antibiotic resistance genes (ARGs) than chloramine. After booster disinfection, the relative abundance of ARGs increased and then decreased along the pipeline. Pipe materials and disinfectant type affected antibiotic resistance and bacterial community.
ENVIRONMENTAL POLLUTION
(2024)
Article
Environmental Sciences
Dan Zhong, Ziyi Zhou, Wencheng Ma, Jun Ma, Weinan Feng, Jinxin Li, Xuan Du
Summary: The extensive use of antibiotics in aquatic environments leads to the emergence of antibiotic resistance genes (ARGs). The pollution of antibiotics and antibiotic resistance genes in drinking water distribution systems has not been extensively studied. This study found a correlation between the resistance mechanisms of chlorine-resistant bacteria and antibiotic resistance mechanisms. Antibiotics induce resistance in chlorine-resistant bacteria to NaClO, rendering low-dose disinfectants ineffective. The study proposes controlling the growth of chlorine-resistant bacteria in the water network by controlling the concentration of biodegradable dissolved organic carbon (BDOC) in the front section. Additionally, the findings show that antibiotic resistance can horizontally spread among different types of bacteria, posing a potential threat to human health.
ENVIRONMENTAL RESEARCH
(2022)
Article
Environmental Sciences
Ziyi Zhou, Dan Zhong, Zhijun Zhang, Wencheng Ma, Jiongleng Chen, Meng Zhuang, Feiyu Li, Jingna Zhang, Yisong Zhu, Peng Su
Summary: This study investigates the role of biofilm in the transmission of antibiotic resistance genes (ARGs) in the drinking water distribution system (DWDS). The results show that pipe wall biofilm is an important pathway for ARG propagation, and vertical gene transfer (VGT) in biofilm is higher than in water, regardless of pipe type.
ENVIRONMENTAL POLLUTION
(2023)
Article
Engineering, Environmental
Xiaoting Gao, Xianshi Wang, Youwei Jiang, Dezhen Kong, Xiangrui Pan, Jun Ma, Yanan Liu
Summary: Halogenated benzoquinones (HBQs) are frequently detected in tap water, with their levels correlated with water age. As the water age increases, the levels of bromo-benzoquinones (Br-BQs) decrease while those of chloro-benzoquinones (Cl-BQs) remain relatively stable. 2,3,5,6-Tetrachloro-1,4-benzoquinone (TCBQ) and 2,6-dibromo-1,4benzoquinone (DBBQ) are the most abundant Cl-BQ and Br-BQ. Chlorination converts highly toxic TCBQ and DBBQ to less-toxic chlorinated/brominated aliphatic disinfection by-products (DBPs), reducing the overall toxicity of water bodies.
JOURNAL OF HAZARDOUS MATERIALS
(2024)
Article
Engineering, Environmental
Soon-Thiam Khu, Changchun Xin, Tianzhi Wang, Ying Zhang, Xin Zuo
Summary: It has been found that the quality of drinking water is deteriorated during its transportation through the drinking water distribution system (DWDS) due to the detachment of biofilm from the pipe wall to the bulk water. This study investigates the effects of hydraulic conditions, such as flow velocity and direction, on biofilm formation and detachment. The results show that fluctuant flow velocity conditions lead to the thickest biofilm and the lowest adhesion force, and the reverse flow condition causes biofilm detachment. This research enhances our understanding of the influence of different hydraulic conditions on biofilm in the DWDS and provides insights on how to operate the DWDS effectively to minimize biofilm detachment.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Engineering, Environmental
Emily A. Curling, Michael J. McKie, Laura Meteer, Blair Saunders, Susan A. Andrews, Robert C. Andrews
Summary: Chloramines, as a secondary disinfectant, can reduce disinfection by-product formation and improve residual stability compared to free chlorine. However, maintaining an acceptable residual in distribution systems may be challenging due to potential high maintenance costs. This study aimed to identify the primary sources of chloramine demand in a distribution system receiving surface and groundwater. Decay in the bulk water was quantified using a bottle point method, and bench-scale pipe section reactors were used to evaluate decay associated with different pipe materials.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Environmental Sciences
Gonzalo Del Olmo, Stewart Husband, Carmen Sanchez Briones, Adela Soriano, Carolina Calero Preciado, Javier Macian, Isabel Douterelo
Summary: Regardless of treatment, disinfection, or operational practices, drinking water distribution systems in Mediterranean countries host diverse microbiomes with biofilm communities. Utilizing flow and turbidity monitoring to manage mobilisation of pipe wall biofilms can help maintain water quality.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Engineering, Environmental
Yanchu Ke, Wenjun Sun, Shuming Liu, Ying Zhu, Shuang Yan, Xiuli Chen, Shuguang Xie
Summary: This study examines the functional attributes of biofilms in drinking water distribution systems (DWDS) and their associations with seasonality. The microbial metabolic traits of biofilms collected during different seasons were analyzed, revealing significant differences in functional attributes among seasons. The results show that genes associated with various metabolic pathways, including aromatic metabolism, fatty acid biosynthesis and degradation, and extracellular polymeric substance (EPS) production, were upregulated in the summer due to higher temperatures and chlorine levels. Nitrogen, sulfur, glycolysis, tricarboxylic acid (TCA) cycling, and carbon fixation pathways were also reconstructed and displayed according to the sampling season. The study highlights the diverse functional genes in DWDS biofilms, their synergetic interrelationships, and the impacts of seasonality on functional attributes.
Article
Engineering, Environmental
Feilong Dong, Zhen Pang, Jianquan Yu, Jing Deng, Xueyan Li, Xiaoyan Ma, Andrea M. Dietrich, Yang Deng
Summary: The study examined the distribution of halogenated disinfection byproducts in a two-source water distribution system with enhanced chlorination, finding that factors such as different water sources, treatment processes, and chlorination levels significantly influenced the spatial and seasonal variations of DBPs. Through innovative methodologies, the research identified high-risk areas for certain DBPs and revealed the effects of various factors on DBP distribution within the system.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Environmental Sciences
Gonzalo Del Olmo, Natalia Malinowski, Geoffrey J. Puzon, Matthew J. Morgan, Carolina Calero, Isabel Douterelo
Summary: Research in a full-scale chlorinated distribution system in the UK showed the presence of potential pathogenic amoebae and bacteria in biofilms, indicating a potential public health risk if the biofilms are mobilised into bulk water.
Article
Engineering, Chemical
Cristina Garcia-Timermans, Bram Malfroot, Cameron Dierendonck, Zoe Mol, Thomas Pluym, Fien Waegenaar, Jan B. A. Arends, Kristof Demeestere, Christophe Walgraeve, Nico Boon, Bart De Gusseme
Summary: Researchers have developed a novel pilot plant design that mimics distribution networks to monitor changes in drinking water quality, such as taste and odor events and microbial regrowth. The pilot plant includes sensors and instrumentation, with three independent loops allowing simultaneous testing of three different conditions. Real-time measurements and biofilm sampling inside the pipes are feasible, making it suitable for studying various factors affecting DW quality in the distribution network.
Article
Engineering, Environmental
Claire Thom, Cindy J. Smith, Graeme Moore, Paul Weir, Umer Z. Ijaz
Summary: The meta-analysis of Illumina 16S rRNA datasets from drinking water systems showed that treatment significantly reduces species abundance and richness, with chlorination having the greatest impact on individual taxa relationships. The study highlights the potential uses of 16S rRNA sequencing for water utilities, including pathogen detection, risk assessment, and monitoring of microbial community changes.
Article
Engineering, Environmental
Isaiah Spencer-Williams, Mitchell Meyer, William Depas, Emily Elliott, Sarah-Jane Haig
Summary: Increases in phosphate availability from phosphate-based corrosion control strategies may result in shifts in nutrient and microbial community composition in drinking water distribution systems. This study found that orthophosphate addition led to significant changes in microbial community composition and increased bacterial density, particularly for nontuberculous mycobacteria. The study also revealed potential species-specific interactions between phosphate and bacteria.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Environmental Sciences
Ye Tian, Zhe Tian, Yupeng He, Guangxi Sun, Yu Zhang, Min Yang
Summary: Enhanced hydrolysis is an effective pretreatment technology for the biological treatment of antibiotic production wastewater. However, the full-scale application of this technology to real oxytetracycline production wastewater requires controlling the organic loading rate to prevent reactor deterioration. The study found that particle formation and blockage were the main causes of reactor deterioration, but this problem could be solved by removing particles from the hydrolyzed wastewater.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Agricultural Engineering
Mingyue Xu, Haishu Sun, Min Yang, Dong Xie, Xiaohong Sun, Jie Meng, Qunhui Wang, Chuanfu Wu
Summary: This study elucidated the dewatering and microbial mechanisms of inoculating a thermophilic bacterial agent (TBA) onto high moisture content biogas residue (BR). The results showed that TBA accounted for a significant water loss rate in BR compared to other factors, and TBA inoculation resulted in a stable product with reduced moisture content and increased seed germination index. Furthermore, TBA inoculation increased microbial diversity and the abundance of functional bacteria, which could benefit organic compound decomposition and plant growth.
BIORESOURCE TECHNOLOGY
(2022)
Article
Environmental Sciences
Shiting Dai, Dejun Liu, Ziming Han, Yang Wang, Xiaofei Lu, Min Yang, Yu Zhang
Summary: This study investigated the environmental behavior of mobile tet(X)-variant genes in manure composting treatments and amended soils. The results showed that tet(X4) was the most prevalent mobile tet(X)-variant gene, and it exhibited the lowest reduction after thermophilic composting, possibly due to its correlation with ISCR2.
Article
Environmental Sciences
Haodi Feng, Mei Tang, Ziming Han, Xiao Luan, Chunmeng Ma, Min Yang, Jiuyi Li, Yu Zhang
Summary: An accurate analytical method was developed to quantify erythromycin A, byproducts, and hydrolysis or biodegradation products in erythromycin fermentation residue (EFR) and amended soil. The method achieved effective extraction and high recoveries for all analytes. EFR, treated EFR, and amended soils were analyzed, and several analytes were detected. The method was useful for evaluating the potential risk of erythromycin A byproducts and transformation products in the environment.
Article
Environmental Sciences
Jinyi Qin, Jiao Fang, Fei Gao, Yiwen He, Ming Su, Yu Zhang, Min Yang
Summary: This study investigated the treatment of Ethinyl Estradiol (EE2) in swine wastewater using an Upstream Solids Reactor (USR), and proposed a new method for bio-feeding regulation to enhance the anaerobic biodegradation process. The addition of propionic acid was found to be more effective in enhancing the removal of EE2 compared to lactic acid. However, controlling the pH at extreme values hindered the fermentation process and negatively affected EE2 removal. The study provides insights into the anaerobic biodegradation of EE2 and suggests a new strategy for the bioremediation of refractory pollutants.
Article
Environmental Sciences
Ling Feng, Binghui Tian, Lili Zhang, Min Yang
Summary: The production of large quantities of industrial waste salts has become a growing concern with the use of zero liquid discharge process in wastewater treatment. This study investigated the purification of waste salt generated during hydrazine hydrate production through pyrolysis. Aerobic pyrolysis was found to be more effective in purification and also reduced CO2 emissions.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Environmental Sciences
Ashraful Islam, Guangxi Sun, Ayman N. Saber, Wei Shang, Xingcan Zheng, Yu Zhang, Min Yang
Summary: This study investigated the characteristics and causes of the persistent yellowish color in biological and tertiary effluents of municipal wastewater using various characterization methods and analysis techniques. It was found that hydrophobic acids were abundant in visible colored dissolved organic matter (DOM), and hydrophobic acids and humic acid-like compounds were the key components responsible for the yellowish color. Additionally, the visible colored DOM in tertiary effluents showed resistance to degradation/removal.
JOURNAL OF ENVIRONMENTAL SCIENCES
(2022)
Article
Environmental Sciences
Ming Su, Jiao Fang, Zeyu Jia, Yuliang Su, Yiping Zhu, Bin Wu, John C. Little, Jianwei Yu, Min Yang
Summary: Cyanobacteria can adjust their photosynthetic pigments to sense different light colors. Some filamentous cyanobacteria increase their phycoerythrin (PE) levels in green light, leading to extensive odor problems in drinking water reservoirs. This study found a correlation between MIB biosynthesis and chromatic acclimation (CA) induced by ambient light color in a MIB-producing Pseudanabaena strain. Pseudanabaena regulates pigment proportion through CA3, increasing PE and decreasing phycocyanin (PC) in green light. MIB production and chlorophyll a (Chl a) biosynthesis are positively correlated regardless of light color.
ENVIRONMENTAL RESEARCH
(2023)
Article
Environmental Sciences
Wenli Fan, Guangxi Sun, Qi Wang, Fan Yang, Yingxin Gao, Min Yang
Summary: This study investigated the role of activated carbon properties in the adsorption of effluent organic matter (EfOM) from bio-treated coking wastewater. Commercial powdered activated carbons (PACs) with different pore structures, surface functional groups, and surface charges were used. The results showed that the adsorption of EfOM depended on its molecular size, with biopolymers being adsorbed by macropores and humics being adsorbed by mesopores. PACs with higher mesopore volume, fewer acidic groups, and higher isoelectric point were found to be more effective in removing EfOM.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Engineering, Environmental
Tengxin Cao, Jiao Fang, Zeyu Jia, Yiping Zhu, Ming Su, Qi Zhang, Yichao Song, Jianwei Yu, Min Yang
Summary: Cellular 2-methylisoborneol (MIB) yield in cyanobacteria varies under different conditions, making MIB prediction ineffective. Through a field survey, we found that mic gene abundance and expression could serve as indicators for early warning of MIB production. Light intensity was identified as the key regulator for mic gene expression and MIB synthesis. We developed a model using mic gene abundance as an indicator for MIB prediction, which was verified in other reservoirs.
Article
Engineering, Environmental
Qiang Li, Lei Wang, Yingting Jia, Min Yang, Haifeng Zhang, Jianying Hu
Summary: Exposure to environmental endocrine-disrupting chemicals (EDCs) can cause extensive health issues. In this study, potential estrogen receptor alpha (ER alpha)-active compounds in the source and drinking water of major rivers in China were identified using an ER alpha protein affinity assay and high-resolution mass spectrometry. Fifty-one potential ER alpha-active compounds across 13 categories were identified, including a compound with antiestrogenic activity and three plausible ER alpha ligands. The study also revealed the presence of 12 compounds in the aquatic environment for the first time.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Xinming Shen, Qiang Li, Wenxin Hu, Min Yang, Wei An, Jianying Hu
Summary: This study reveals that drinking water from six major cities in China can significantly promote foam cell formation in atherosclerosis, and chemicals in the water may play a role in this process by antagonizing liver X receptor alpha.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Review
Environmental Sciences
Hang Liu, Ziqi Li, Chao Liu, Zhimin Qiang, Tanju Karanfil, Min Yang
Summary: This review compares the elimination of intracellular and extracellular antibiotic resistance genes (ARGs) in representative disinfection processes applied at water and wastewater treatment plants. The study found that ozone had the highest elimination efficiency, followed by chlorine and chloramine. The elimination of extracellular ARGs could be up to 4-log higher than that of intracellular ARGs.
Article
Public, Environmental & Occupational Health
Yu Zhang, Timothy R. Walsh, Yang Wang, Jianzhong Shen, Min Yang
Summary: Antimicrobial resistance (AMR) is a global crisis that requires collaboration between humans, animals, and the environment. The environment is a potential source, reservoir, and transmission route of AMR, playing a critical role in its development. Minimizing emissions and setting limits on antimicrobial emission are key priorities in controlling environmental AMR. Taking effective actions in environmental management and engineering can reduce the risks of AMR development.
Article
Environmental Sciences
Fan Yang, Jianwei Yu, Qi Wang, Chunmiao Wang, Yuning Du, Zhiyuan Liu, Lili Zhang, Zhengang Liu, Chuanyong Jing, Junwang Tang, Min Yang
Summary: This study proposes a novel approach for regulating the hydrophobicity of activated carbon surface by rearranging carbon atoms through thermal transformation. The transformed hydrophobic porous carbons (HPCs) showed increased adsorption capacity and faster adsorption rates for removing odorants. This method provides a new angle for improving the surface hydrophobicity of activated carbon and may lead to the development of high-performance adsorbents.
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.
