Article
Engineering, Environmental
Yuanxi Huang, Haoyu Xu, Baiyang Chen, Huimei Pan, Zechao Qiu
Summary: Haloacetaldehydes (HALs), common disinfection byproducts in drinking water, can be effectively degraded by UV254, with chloride as the major product and substantial decrease in total organic carbon. The simultaneous cleavage of carbon-chloride bonds in Cl-HALs during photolysis was observed, and factors such as free chlorine and various ions were found to influence the photolysis rates.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Engineering, Environmental
Yixin Huang, Jing Zou, Jinbin Lin, Haoyu Yang, Mengyun Wang, Jiawen Li, Wei Cao, Baoling Yuan, Jun Ma
Summary: This study discovers that 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonate) (ABTS) can serve as both an activator and an electron shuttle to enhance the activation of peroxydisulfate (PDS) and enhance the degradation of diclofenac (DCF). The PDS/ABTS system generates multiple reactive species, with ABTS(center dot+) and (OH)-O-center dot directly contributing to the degradation of DCF. The PDS/ABTS system shows good anti-interference capacity and further improved performance can be achieved by encapsulating ABTS into cellulose.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Environmental
Zhenran Wang, Jiewen Deng, Yunlan Peng, Shixiang Wang, Yongsheng Fu, Yiqing Liu
Summary: This study demonstrates the effective removal of diclofenac (DCF) using the Cu(II)/hydroxylamine (HAm)/peroxydisulfate (PDS) system under neutral conditions. The introduction of HAm significantly enhances the degradation of DCF by accelerating the Cu(I)/Cu(II) cycle. The study also investigates the effects of various operational parameters and water matrix components on DCF degradation. Additionally, the Cu(II)/HAm/PDS system shows potential for degrading other emerging organic contaminants.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Engineering, Environmental
Bryan Liu, Lauren Mullen, Emma M. Payne, Karl G. Linden
Summary: Krypton chloride (KrCl*) excimer ultraviolet (UV) light may offer advantages over conventional low-pressure (LP) UV for contaminant degradation. The authors investigated the direct and indirect photolysis as well as UV/hydrogen peroxide-driven advanced oxidation (AOP) of two chemical contaminants in different water samples using KrCl* and 254nm, 222nm UV sources. The results showed that the 222nm excimer lamps significantly improved the degradation of contaminants compared to the conventional 254nm LPUV. Rating: 8/10.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Environmental Sciences
Takahiro Fujioka, Hitoshi Kodamatani, Hai Duc Minh Tran, Atsushi Fujioka, Koki Hino, Takumi Yoshikawa, Daisuke Inoue, Keisuke Ikehata
Summary: Advanced oxidation processes (AOPs) are effective in removing emerging pollutants such as N-nitrosodimethylamine and 1,4-dioxane during potable water reuse. Vacuum-ultraviolet (V-UV) light treatment is advantageous, and the addition of hydrogen peroxide enhances pollutant removal efficiency.
Article
Biochemistry & Molecular Biology
Renata Spagolla Napolea, Douglas Adamoski, Alessandra Girasole, Ellen Nogueira Lima, Amauri da Silva Justo-Junior, Romenia Domingues, Ana Clara Caznok Silveira, Rafael Elias Marques, Murilo de Carvalho, Andre Luis Berteli Ambrosio, Adriana Franco Paes Leme, Sandra Martha Gomes Dias
Summary: Ultraviolet C (UVC) light has been used for sterilization, and filtered KrCl excimer lamps emitting at 222 nm have been proposed as safer alternatives. This study compared the effects of UV 254 nm and UV 222 nm on cell viability, DNA damage, protein oxidation, and skin morphology. It found that UV 254 nm caused more alterations in reactive oxygen species and inflammatory responses, but UV 222 nm caused minor damage to the skin and raised concerns about skin regeneration pathways.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY
(2023)
Article
Environmental Sciences
Chourouk Ibrahim, Rawand Hamdi, Salah Hammami, Pierre Pothier, Nesserine Khelifi, Abdennaceur Hassen
Summary: The study found that wastewater samples collected from WWTP El Menzeh I and Charguia I contained Hepatovirus A, with different treatment methods affecting water quality and virus quality differently. Therefore, it is necessary to improve the treatment processes of these two sewage purification plants and establish proper national virological standards to control the circulation rates of enteric viruses in Tunisian municipal wastewater.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Engineering, Environmental
Miljana Radovic Vucic, Rada Baosic, Jelena Mitrovic, Milica Petrovic, Nena Velinov, Milos Kostic, Aleksandar Bojic
Summary: The study found that photodegradation is most effective in the first 10 minutes of treatment of organic pollutants in simulated urban wastewater. Pearson's correlation coefficient analysis and principal component analysis were used to determine the relationship between different degradation processes and the structure of compounds and degradation efficiency. This analysis allows for a more efficient choice of degradation processes and determination of treatment costs.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2021)
Article
Engineering, Environmental
Anaelle Gabet, Helene Metivier, Christine de Brauer, Gilles Mailhot, Marcello Brigante
Summary: UVB radiation is more efficient in generating radicals, while the persulfate system shows higher efficiency in oxidant precursors. The Yeast Estrogen Screen assay is used to track estrogen degradation and ensure removal of estrogenic activity.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Construction & Building Technology
Natalia Ruetalo, Simon Berger, Jennifer Niessner, Michael Schindler
Summary: Exposing aerosolized SARS-CoV-2 to a low dose of UV-C irradiation (0.42-0.51 mJ/cm(2) at 254 nm) resulted in more than 99.9% reduction in viral titers, demonstrating the high effectiveness of UV-C-based decontamination of aerosols in reducing SARS-CoV-2 infectivity.
Article
Engineering, Environmental
Lu Wang, Ke Jing, Baowei Hu, Junhe Lu
Summary: The formation of halogenated oxidation by-products in sulfate radical based advanced oxidation process has raised concerns. Addition of hydrogen peroxide can significantly suppress the generation of halogenated-OBPs, but the formation of organic bromines is still a concern.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Spectroscopy
Seda Uzunboy, Ozge Karakas, Sema Demirci-cekic, Resat Apak
Summary: A selective and simple colorimetric method for determining sulfate anion radical has been developed, using Cr(III) as an activator for persulfate. This method allows measurement of the formation and scavenging of sulfate anion radical, as well as other UV-absorbing sulfate radical scavengers.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2021)
Article
Environmental Sciences
Chien-Yu Chen, Yi-Chin Cho, Yi-Pin Lin
Summary: In this study, multi-walled carbon nanotubes (MWCNT) were utilized to activate peroxydisulfate (PDS) for the degradation of 2,4-dichlorophenol (2,4-DCP), and the effects of solution pH, PDS concentration, 2,4-DCP concentration, and MWCNT loading on the degradation process were investigated. The results indicated that surface reactions involving both surface-bound radicals and direct electron transfer were responsible for 2,4-DCP degradation, with the rate increasing with higher solution pH, PDS concentration, and MWCNT loading. Reusability tests suggested that surface sites responsible for surface-bound radical formation were deactivated after PDS activation, while those responsible for direct electron transfer remained active.
Article
Chemistry, Multidisciplinary
Min Liang, Chang Yu, Suyi Dai, Haijun Cheng, Weiguang Li, Fang Lai, Li Ma, Xiongmin Liu
Summary: In this study, the photolysis reaction of 1,3-butadiene was investigated using UV-vis spectrophotometry. The results showed that ultraviolet irradiation could accelerate the photolysis reaction rate of 1,3-butadiene. Gas chromatography-mass spectrometry was used to determine the reaction products and identify the reaction pathways.
Article
Engineering, Environmental
Yangjian Zhou, Yu Lei, Qingqing Kong, Xin Lei, Jianglin Peng, Yufeng Xie, Shuangshuang Cheng, Yanpeng Gao, Junlang Qiu, Xin Yang
Summary: This study reported a novel pathway for the generation of sulfate radical (SO4 center dot-) during the oxidation of neonicotinoids by peroxydisulfate (PDS) without any additional chemicals. Thiamethoxam (TMX) was found to activate PDS via TMX anion radical (TMX center dot-), leading to the generation of SO4 center dot-. This pathway was also applicable to other neonicotinoids.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Environmental Sciences
Teng Zhang, Jiayue Dong, Yuefei Ji, Deyang Kong, Junhe Lu
Summary: This study found that nitrite can sensitize the photodegradation of BPs, forming hydroxylated and nitrated products. The increase in nitrite concentration accelerated the degradation of BPs, with different contributions of NO2 center dot and center dot OH in various circumstances.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Liang Meng, Jing Chen, Deyang Kong, Yuefei Ji, Junhe Lu, Xiaoming Yin, Quansuo Zhou
Summary: Peracetic acid (PAA) has been widely used as a disinfectant in wastewater treatment, but its oxidation of bromide-containing wastewater has not been fully explored. This study found that PAA can oxidize bromide ions to form organic bromine compounds, such as bromophenols. Regulated brominated disinfection byproducts (Br-DBPs) only accounted for a small fraction of the organic bromine formed. Monitoring regulated DBPs may not fully indicate the potential environmental risk of PAA application in wastewater treatment.
Article
Engineering, Environmental
Peizeng Yang, Gregory Korshin, Jiayue Dong, Yuefei Ji, Junhe Lu
Summary: Recent studies have found that nitrite and ammonium can lead to the formation of nitrophenolic byproducts during SO4 center dot- oxidation processes. This study provides further insights into the mechanisms of nitrated byproduct formation.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Environmental Sciences
Yi Fei, Zhuangzhuang Liu, Liang Meng, Guoqiang Liu, Deyang Kong, Xiaoxue Pan, Feng Zhu, Junhe Lu, Jing Chen
Summary: This study comprehensively investigated the degradation of DCP by Fe (VI) in different matrices, identifying 20 degradation products and proposing reaction pathways. The most vulnerable cleavage site and the most likely hydroxylation site were revealed through theoretical calculations. The feasibility of using Fe (VI) to degrade DCP in municipal wastewater and lake water was evaluated and confirmed.
ENVIRONMENTAL POLLUTION
(2022)
Article
Engineering, Environmental
Jiayue Dong, Peizeng Yang, Jing Chen, Yuefei Ji, Junhe Lu
Summary: The removal and transformation of nitrophenolic byproducts in a simulated drinking water treatment train were examined. It was found that these byproducts can enter the treatment system and react with residual chlorine to form more hazardous compounds.
Article
Engineering, Environmental
Lixiao Wang, Haiyan Xu, Junhe Lu, Jean-Marc Chovelon, Yuefei Ji
Summary: Ambroxol (AMB) is an effective expectorant drug commonly used to treat bronchitis. However, the extensive use and excretion of AMB by humans lead to its widespread occurrence in wastewater. This study investigates the photolysis of AMB in aqueous solution under 254 nm ultraviolet radiation (UV254). The results show that AMB undergoes complex photoreactions, including photoreduction, photoionization, photonucleophilic substitution, side-chain cleavage, and coupling reactions. UV254 radiation effectively degrades AMB in wastewater, but caution should be exercised when treating wastewater with high concentrations of AMB due to the potential formation of toxic byproducts.
Article
Chemistry, Multidisciplinary
Yuexuan Li, Yun Liu, Xuan Zhang, Kun Tian, Ding Tan, Xiaosan Song, Ping Wang, Qian Jiang, Junhe Lu
Summary: This study used Fe-ZSM-5 zeolite as a catalyst in an electrochemical system to efficiently degrade chlorinated aromatic compounds. Fe-ZSM-5 significantly accelerated the degradation rate and expanded the working pH range. The degradation process was primarily mediated by reductive dechlorination and oxidation. Fe-ZSM-5 exhibited high stability and reusability.
Article
Environmental Sciences
Liang Meng, Jiayue Dong, Jing Chen, Junhe Lu, Yuefei Ji
Summary: Peracetic acid (PAA) and PAA-based advanced oxidation processes (AOPs) have gained increasing interest for the treatment of emerging micropollutants due to their environmental-friendly nature and less generation of harmful disinfection byproducts. In this work, the kinetics and transformation mechanisms of three tetracyclines in the UV-activated PAA oxidation process were systematically investigated. The results showed that UV/PAA efficiently decayed the tetracyclines, with different reaction rate constants and susceptibilities to free radicals. The degradation pathways of tetracyclines by PAA non-radical oxidation were proposed based on product identification and theoretical calculation.
Article
Engineering, Environmental
Xiaoyang Li, Ruolin Lv, Weiming Zhang, Mingyang Li, Junhe Lu, Yi Ren, Yue Yin, Jiahang Liu
Summary: The application of heterogeneous advanced oxidation processes (AOPs) in wastewater treatment is hindered by low oxidant utilization efficiency, slow catalytic cycling, and matrix interference. This study demonstrates that amorphous zirconium dioxide (aZrO2), a redox-inert metal oxide, can efficiently activate peroxymonosulfate (PMS) to degrade organic micropollutants even under low oxidant doses and complex matrices. The surface Zr(IV)-PMS* complex is identified as the principal reactive species, and the interaction between Zr atom and PMS leads to prolonged O-O bond and elevated oxidation potential for direct reaction with contaminants.
Article
Environmental Sciences
Teng Zhang, Jiayue Dong, Cunliang Zhang, Deyang Kong, Yuefei Ji, Quansuo Zhou, Junhe Lu
Summary: This study investigated the photo-chemical properties of two representative fluoroquinolones (FQs), norfloxacin (NORF) and ofloxacin (OFLO). Both FQs were found to sensitize the photo-transformation of acetaminophen under UV-A irradiation, with excited triplet state (3FQ*) as the main active species. The presence of bromine ions resulted in an increased transformation of acetaminophen, indicating the involvement of reactive bromine species (RBS). The identified reaction products and theoretical computation proposed the transformation pathways of acetaminophen under UV-A irradiation.
Article
Chemistry, Multidisciplinary
Xu Gao, Peizeng Yang, Cunliang Zhang, Deyang Kong, Yuefei Ji, Junhe Lu
Summary: This study reveals that nitrophenolic compounds can be formed by the reaction of natural organic matter and nitrite under sunlight. This suggests that the natural contribution of these compounds in the environment may have been overlooked.
ENVIRONMENTAL CHEMISTRY LETTERS
(2023)
Article
Engineering, Environmental
Jiating Liu, Peizeng Yang, Yuefei Ji, Junhe Lu
Summary: Sulfate radical-based advanced oxidation processes (SR-AOPs) have the potential to effectively degrade emerging contaminant tetrabromobisphenol S (TBBPS). However, this study found that sulfate radicals also react with ammonium, leading to the suppression of TBBPS degradation. The presence of ammonium changes the pathways and products of TBBPS degradation in SR-AOPs.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Xulei Zhao, Jingjing Gui, Peizeng Yang, Deyang Kong, Junhe Lu, Jean-Marc Chovelon, Yuefei Ji
Summary: The study demonstrates that UV/PDS oxidation is an effective technology for the removal of organic pollutants in wastewater, such as 2,4-dichlorophenol (DCP). The presence of nitrite (NO2-) significantly increases the degradation rate and changes the degradation pathways. The reactive species nitryl chloride (ClNO2) is generated in situ and plays a critical role in the degradation of DCP.
ACS ES&T ENGINEERING
(2023)
Article
Environmental Sciences
Jiayue Dong, Peizeng Yang, Gregory V. Korshin, Junhe Lu
Summary: Bromide (Br-) catalyzes the transformation of nitrite (NO2-) to nitrophenolic byproducts in sulfate radical oxidation processes. These new insights underscore the potential hazardous effects when sulfate radical oxidation is applied under realistic environmental conditions.
Article
Engineering, Environmental
Xu Gao, Qi Zhang, Ziyi Yang, Yuefei Ji, Jing Chen, Junhe Lu
Summary: UV/PDS oxidation is a promising technology for degrading organic pollutants. However, this study found that nitrate can lead to the formation of toxic nitrophenolic byproducts during the UV/PDS oxidation of natural organic matter. Nitrate is photolyzed to produce nitrite, which acts as a nitrating agent. Meanwhile, SO4•- oxidizes the phenolic moieties of NOM molecules, generating phenoxyl radicals. The phenoxyl radicals react with nitrite to generate nitrated byproducts. Additionally, the aromatic carboxyl moieties of NOM molecules can be decarboxylated upon reaction with SO4•-, contributing to the formation of nitrated byproducts. This study reveals a novel nitration mechanism specific to the UV/PDS process and raises concerns about the potential risks when this technology is used for wastewaters with high levels of nitrate.
ACS ES&T ENGINEERING
(2022)
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.
