Article
Environmental Sciences
Xu Ma, Jiaxi Zhang, Mario A. Gomez, Yu Ding, Shuhua Yao, Hongtao Lv, Xin Wang, Shaofeng Wang, Yongfeng Jia
Summary: The coprecipitation and aging of Fe(III)-As(III)-As(V)-SO4(2-) in acidic systems play a crucial role in controlling arsenic behavior. The study investigates the redistribution and transformation of arsenic in the system at different Fe/As molar ratios and pH values. Results show that As(III) contents in the solid products change with aging time and conditions, indicating the complex behavior of arsenic in the system.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Food Science & Technology
Lena Ruzik, Malgorzata Jakubowska
Summary: The popularity of plant-based food products has grown in response to the increasing demand for plant foods. This study analyzed the total arsenic content and its species in plant-based beverages purchased in Poland. The research validated a method for analyzing arsenic using high-performance liquid chromatography combined with inductively coupled plasma mass spectrometry.
Article
Engineering, Environmental
Binbin Shao, Jing Deng, Hongyu Dong, Shuchang Wang, Enchao Li, Xiaohong Guan
Summary: Recent research has discovered that the iron(III)-(1,10-phenanthroline) complex can act as an activator, enhancing the degradation of emerging organic contaminants (EOCs) by Fe(VI) and increasing its overall oxidation capacity. This is achieved through direct electron transfer (DET) and electron shuttle action.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Environmental Sciences
Sunday J. Olusegun, Taiane. G. F. Souza, Nelcy. D. S. Mohallem, Virginia. S. T. Ciminelli
Summary: Pure ferrihydrite and ferrihydrite-biosilica composite were synthesized and studied for the removal of As(III) and As(V). The synthesized materials showed high adsorption capacity for As(III) and As(V), with pH significantly affecting As(V) adsorption. Thermal treatment promoted ferric arsenate formation and oxidized As(III) to As(V), resulting in changes in As mobility in the adsorption residues. This work presents a process for environmentally safe disposal of As residues after As removal and thermal treatment of arsenic-loaded ferrihydrites.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2023)
Article
Engineering, Environmental
Sheng Gong, Jingnan Yang, Qinyi Pan, Xuran Liu, Quan Zhang, Dongbo Wang
Summary: A new approach, using the FeS/sulfite system, is proposed to improve the removal of roxarsone (ROX). Experimental results show that approximately 100% of ROX (20 mg/L) can be removed within 40 minutes using this approach. The FeS/sulfite system is a non-homogeneous activation process, with SO4 center dot-, center dot OH, and O-1(2) identified as reactive oxidizing species.
Article
Chemistry, Multidisciplinary
Erdenechimeg Byambaa, Jaeyoung Seon, Tae-Hyun Kim, Shin Dong Kim, Won Hyun Ji, Yuhoon Hwang
Summary: Arsenic, a toxic element commonly found in drinking water in developing countries in Asia, poses a serious global human health concern. This study successfully removed arsenic from water using an adsorbent material, MIRESORBTM, prepared from mine waste and compared its performance with a commercial adsorbent, granular ferric hydroxide (GFH). The results demonstrated MIRESORBTM as a highly efficient and economical adsorbent for arsenic removal.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Multidisciplinary
Deniz Turkmen, Melike Ozkaya Turkmen, Semra Akgonullu, Adil Denizli
Summary: In this study, magnetic ion-imprinted polymers were fabricated for arsenic removal, using N-methacryloyl-l-cysteine (MAC) monomer and As(III) and As(V) as template molecules. The novel method showed ideal adsorption of As(III) and As(V) and high selectivity towards arsenic in the presence of other anions and oxi-anions. The adsorption isotherm model fitted the Langmuir model well with high removal capacities for both As(III) and As(V).
SEPARATION SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Environmental
Tao Yang, Jiamin Mai, Haijun Cheng, Mengyang Zhu, Sisi Wu, Liuyan Tang, Ping Liang, Jianbo Jia, Jun Ma
Summary: This study investigated the use of UVA-LED in combination with Fe(VI) for degrading micropollutants, showing significant enhancement compared to Fe(VI) alone. Factors such as wavelength, light intensity, and pH were found to influence the degradation performance.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Chemistry, Analytical
Yifei Zhang, Danlei Li, Richard G. Compton
Summary: We have developed a new and sensitive stripping voltammetric method for the detection of As(III) in aqueous solution using gold macroelectrode or gold nanoparticle-modified glassy carbon electrode (GCE). The method is based on underpotential deposition (UPD) of As ad-atoms and provides linear responses within the range of 0.01 μM to 0.1 μM or 0.005 μM to 0.1 μM for gold macroelectrodes and gold nanoparticle-modified electrodes, respectively. The method shows practical value with clear and discernable signals even at low concentrations of As(III), meeting the WHO limit for drinking water.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2022)
Article
Metallurgy & Metallurgical Engineering
Pedro Hernandez, Gonzalo Recio, Alex Schwarz, Denys Villa-Gomez, Gordon Southam, Felipe Saavedra-Mella, Christian Canales, Ivan Nancucheo
Summary: Chile's copper concentrates suffer from high levels of arsenic, posing challenges for the mining industry. In this study, acidophilic sulfate reducing bacteria (SRB) were used to remove arsenic from acidic mine water, achieving over 95% removal of both As (III) and As (V) as arsenic sulfide.
Article
Engineering, Environmental
Xiaoyu Ma, Xitao Liu, Wenbo Ren, Zhou Zhou, Chunye Lin, Mengchang He, Wei Ouyang
Summary: This study utilized waste heating pad to activate peroxymonosulfate for the degradation of roxarsone and as a functional adsorbent for the adsorption of released inorganic arsenic, achieving the resource utilization of waste and bringing economic and environmental benefits to environment remediation.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Environmental Sciences
Lina Xu, Zhu Shu, Jingyang Song, Tiantian Li, Jun Zhou
Summary: Arsenic pollution in water is a severe environmental challenge for human health and adsorption is commonly used for selective arsenic removal. However, developing a low-cost and easily recoverable adsorbent remains a challenge. In this study, alpha-FeOOH-decorated monolith bamboo composites (alpha-FeOOH/MB) were fabricated, which showed significantly increased adsorption capacity for arsenic compared to pure alpha-FeOOH nanoneedles. The composites also exhibited positive reusability and high arsenic adsorption selectivity, making them a favorable candidate for practical arsenic decontamination.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Biochemistry & Molecular Biology
Xinyue Zhao, Dingyang Chen, Nan Zhang, Minsi Shi, Wei Hu, Guangli Yu, Rui Zhao
Summary: Combining adsorption with other technologies has great potential in removing arsenic ions quickly and deeply. In this study, chitosan-zirconium composite adsorptive membranes (CS-Zr CM) were successfully prepared and showed good adsorption performance in arsenic ion-capture electrodialysis. The CS-Zr CM had high adsorption capacities for As(III) and As(V), and could efficiently reduce the concentrations of As(III) and As(V) ions to below the WHO limit in drinking water within 12 hours.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2024)
Article
Engineering, Environmental
Shaojie Zhou, Hua Shang, Jiewen Luo, Minghao Shen, Qi Wang, Shicheng Zhang, Xiangdong Zhu
Summary: The study reveals that during the subcritical hydrothermal liquefaction of livestock manure, less toxic roxarsone is converted into more toxic arsenic compounds, with majority of arsenic distributed in the liquid phase. Furthermore, the hydrothermal products facilitate the conversion of As(V) to As(III).
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Engineering, Environmental
Zhuang-Song Huang, Lu Wang, Yu-Lei Liu, Hong-Yan Zhang, Xiao-Na Zhao, Yang Bai, Jun Ma
Summary: This study elucidated the crucial role of ferrate self-decomposition in oxidation reactions and developed a mechanistic kinetics model to understand the involvement of Fe(V), Fe(VI), and Fe(IV) species in the oxidation of PMSO. Results showed that the Fe(V) species derived from ferrate self-decomposition contributed significantly to PMSO oxidation, while the oxidation pathways of Fe(VI) and Fe(V) were influenced by different factors. The findings suggest the general role of Fe(V) and the potential enhancement by Fe(III) during ferrate oxidation of micropollutants.
Article
Engineering, Environmental
Tao Yang, Jiamin Mai, Haijun Cheng, Mengyang Zhu, Sisi Wu, Liuyan Tang, Ping Liang, Jianbo Jia, Jun Ma
Summary: This study investigated the use of UVA-LED in combination with Fe(VI) for degrading micropollutants, showing significant enhancement compared to Fe(VI) alone. Factors such as wavelength, light intensity, and pH were found to influence the degradation performance.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Environmental
Sisi Wu, Tao Yang, Jiamin Mai, Liuyan Tang, Ping Liang, Mengyang Zhu, Cui Huang, Qiuhua Li, Xiaoxiang Cheng, Minchao Liu, Jun Ma
Summary: In this study, effective removal of organoarsenic ROX was achieved by the combined process of chlorination + Fe(II), with chlorine degrading ROX effectively at different pH levels. The degradation of ROX was mainly attributed to the reaction between HOCl and deprotonated ROX, while humic acid inhibited this degradation. Furthermore, an enhanced removal of total arsenic was observed after chlorination, with over 97.8% of total arsenic removed.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Environmental Sciences
Yuqi Li, Tao Xiang, Hong Liang, Peng Wang, Dawen Gao
Summary: This study demonstrated the rapid resuscitation of a stable mainstream deammonification system using a PFBR and long-term refrigerated sidestream sludge, with efficient performance achieved through controlling the aeration rate. The proportional balance of AnAOB and AOB activity ensured the system's effectiveness, while Pearson correlation analysis revealed important relationships between microbial abundances, ammonium concentrations, and refrigeration effects on symbiotic relationships.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Environmental Sciences
Tao Xiang, Hong Liang, Dawen Gao
Summary: The AnAOB granular sludge reactor showed faster recovery and higher nitrogen removal performance compared to the AOB-AnAOB granular sludge reactor after long-term storage, indicating better application potential and more active characteristics of aggregation metabolism.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Environmental
Tao Yang, Jun Ma, Sisi Wu, Jiamin Mai, Lingrong Chen, Cui Huang, Ge Zeng, Ying Wu, Mengyang Zhu, Yuru Huang, Zongwen Mo, Lin Guo, Jianbo Jia
Summary: In this study, the Fe(VI)/sulfite process was used to effectively remove ICM and control the formation of I-DBPs in the subsequent disinfection.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Environmental
Xian-Shi Wang, Yu-Lei Liu, Li-Xu Xue, Heng Song, Xiang-Rui Pan, Zhe Huang, Shu-Yue Xu, Jun Ma, Lu Wang
Summary: Up to 15 disinfection byproducts (DBPs) were found in anthracite-filtered water, while DBPs were undetectable in water filtered with other materials. New anthracite-filtered water contained lower levels of dissolved organic carbon, dissolved organic nitrogen, and ammonia nitrogen compared to aged anthracite-filtered water. Organic carbon was released into the filtered water, with a small percentage being toxic and carcinogenic aromatic carbons.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Xiao-Na Zhao, Zhuang-Song Huang, Gui-Jing Wang, Yu-Lei Liu, Wei-Wei Song, Jun Ma, Lu Wang
Summary: Manganese ion (Mn(II)) in groundwater, caused by the contamination of molybdenum mining, inhibited the oxidation of organic pollutants by Fe(VI). However, it was found that the Fe(VI)/Mn(II) system significantly improved the oxidation efficiency of bisphenol compounds (BPA, BPF, AAP, and 4-tBP) at pH 7.0.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Cui Huang, Tao Yang, Mingwei Li, Jiamin Mai, Sisi Wu, Juan Li, Guobiao Ma, Changyu Liu, Jianbo Jia, Jun Ma
Summary: Hexavalent chromium (Cr(VI)) was efficiently removed by activation with ultraviolet-A light-emitting diode (UVA-LED), degrading various pollutants. The generation of hydroxyl radicals (HO•) and pentavalent chromium (Cr(V)) in the UVA-LED/Cr(VI) system was confirmed. Hydroxyl radicals were identified as the dominant reactive species, aiding in the removal of pollutants in chromium-containing wastewater.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Environmental Sciences
Qingliang Liu, Jinan Zhu, Lu Wang, Xianshi Wang, Zhuangsong Huang, Feng Zhao, Jing Zou, Yulei Liu, Jun Ma
Summary: Microbes play a dominant role in the degradation of organic contaminants in the environment, yet there is still a lack of understanding regarding the degradation mechanism and the function of different species. This study explores the possible biodegradation of triclosan in a microbial fuel cell, investigating degradation kinetics, microbial community, and possible degradation products. Triclosan at a concentration of 5 mg/L could be degraded within 3 days, with an intermediate degradation product (2,4-dichlorophen) further degraded in the system. A total of 32 dominant bacteria (relative intensity >0.5%) were identified in the biofilm, and 10 possible degradation products were identified. By analyzing the potential bioreactions and degradation pathway based on the identified products, the biodegradation mechanism and function of the bacteria involved in triclosan degradation were clarified. This study provides valuable information for understanding the degradation mechanism of organic pollutants in mixed flora through analysis of the microbiome community and degradation pathway.
Article
Engineering, Environmental
Juan Li, Tao Yang, Ge Zeng, Linqian An, Jin Jiang, Zhimin Ao, Jun Ma
Summary: In this study, a novel LED-activated periodate advanced oxidation process (UVA-LED/PI AOP) was developed and investigated for the degradation of naproxen (NPX) and other micropollutants. The UVA-LED/PI AOP showed a broad-spectrum degradation ability, with hydroxyl radical and ozone being the dominant species responsible for NPX degradation. The pH and irradiation wavelength had a negative effect on NPX degradation, explained by the decreased quantum yield of PI. The UVA-LED/PI AOP could be a promising technology for micropollutant treatment in aqueous solutions.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Wei Shi, Xiaojing Liu, Yulei Liu, Dong Li, Xili Tong, Jun Ma, Lu Wang
Summary: The effect of a robust and easy-recovery catalyst, Fe2O3/Al2O3-SiC, for catalytic ozonation of hardly biodegradable COD in coking wastewater was explored. The catalyst showed a higher removal ratio of hard COD and generation speed of hydroxyl radical compared to ozonation alone. In a full-scale application, Fe2O3/Al2O3-SiC catalytic ozonation decreased ozone consumption and operation cost.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Environmental Sciences
Wenxin Song, Zhimin Gao, Fengxun Tan, Xiaoxiang Cheng, Tao Yang, Daoji Wu, Jingxin Yang, Heng Liang
Summary: The combination of calcium sulfite oxidation and ultrafiltration effectively removes algal pollutants, reduces membrane fouling, and improves membrane filter flux.
Article
Engineering, Environmental
Tao Yang, Cui Huang, Linqian An, Ge Zeng, Juan Li, Changyu Liu, Xiaolong Xu, Jianbo Jia, Jun Ma
Summary: This study reports for the first time that solar light irradiation of hexavalent chromium (Cr(VI)) can effectively degrade various micropollutants. The solar light/Cr(VI) system increases the removal efficiency of selected micropollutants by 13.3-64.8% compared to direct solar photolysis. The major reactive species in this system is hydroxyl radical (&·OH).
Article
Engineering, Environmental
Yunpeng Wang, Zijun Xiao, Yulei Liu, Wenjie Tian, Zhuangsong Huang, Xiaona Zhao, Lu Wang, Shaobin Wang, Jun Ma
Summary: This study found that carbon quantum dots (CQDs) played a significant role in the water purification process using Fe(VI) as a catalyst. CQDs facilitated direct electron transfer (DET) from organic pollutants to Fe(VI), improving the oxidation efficiency and alleviating the negative impact of solution pH and background constituents.
Article
Engineering, Environmental
Bo Peng, Tao Xiang, Hong Liang, Dawen Gao
Summary: This study found that low concentrations of acetic acid and propionic acid can enhance the performance of the anammox process. When the organic acid concentration is too high, heterotrophic denitrification begins to dominate. Under organic inhibition, anammox bacteria restore energy supply through the carbon fixation pathway and citrate cycle.
JOURNAL OF ENVIRONMENTAL CHEMICAL 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.
