Article
Engineering, Environmental
Shaoxiong He, Li Ling, Yuxin Wu, Shiming Yang, Zhechao Hua, Kejin Tang, Mengye Wang, Mingshan Zhu, Jingyun Fang
Summary: The AUV/chlorine/AC-TiO2 process achieves efficient micropollutant abatement and DBP control by enhancing HO center dot production and DBP in situ adsorption, respectively. The use of activated carbon (AC) in the process results in higher degradation rates and reduced formation of undesired disinfection byproducts (DBPs). AC acts as an electron conductor and DO adsorbent, leading to increased levels of HO center dot and decreased formation of DBPs. This study provides a new strategy for designing catalysts with photocatalytic and adsorption properties to improve micropollutant abatement and DBP control in the UV/chlorine process.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Phuoc-Dan Nguyen, Thi-Minh-Tam Le, Thi-Kim-Quyen Vo, Phuong-Thao Nguyen, Thi-Dieu-Hien Vo, Bao-Trong Dang, Nguyen-Thanh Son, Dinh Duc Nguyen, Xuan-Thanh Bui
Summary: The study investigated the combination of submerged membrane filtration and powdered activated carbon for nonylphenol ethoxylates removal, showing that the best removal efficiency was achieved under specific conditions. Removal efficiency varied over time, with a majority of organic carbon adsorbed into activated carbon.
WATER SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Environmental
Jiadong Peng, Ran Yin, Xin Yang, Chii Shang
Summary: This study presents a novel UVA/chlorine dioxide (ClO2) advanced oxidation process (AOP), which generates a spectrum of reactive species through the photolysis of ClO2 using UVA-LEDs. The UVA(365)/ClO2 AOP exhibits lower pH-dependency, lower energy input requirement, and lower formation of byproducts compared to the well-known UVC254/chlorine AOP.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Chemical
Sijia Yu, Jingwei Wang, Zhiping Zhao, Weiwei Cai
Summary: This study proposes a method that combines fluidized granular activated carbon (GAC) and PAC with the UF process to improve water treatment efficiency. The results show that fluidized GAC particles effectively remove PAC deposition and fouling. PAC improves the effluent quality by adsorbing humic acid-like substances, and the energy consumption of GAC fluidization is lower compared to conventional fouling control methods in UF. This integrated GAC-PAC-UF process is technically feasible and economically viable, potentially achieving high permeate quality and reducing membrane fouling.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Engineering, Environmental
Cong Ma, Qianqian Li, Jiani Liu, Hangtong Bao, Liang Wang, Bin Zhao, Zhaohui Zhang
Summary: The study found that the addition of coexisting components increased the attraction between pollutants and membranes, promoting the development of membrane fouling, especially with Ca2+ and HA exacerbating irreversible membrane fouling.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Environmental Sciences
Yajun Wang, Yanchao Xu, Siyong Zhang, Yanjuan Li, Wenlong Liu
Summary: This study thoroughly analyzed the effects of PAC dosage on the performance of PAC-MBRs in treating biochemical tailwater. The results showed that PAC addition enhanced the removal efficiency of MBRs, especially for total nitrogen. Furthermore, PAC application prolonged the duration of membranes by suppressing biological fouling.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Jinchuan Lian, Lijie Zhang, Fengxun Tan, Jingtao Xu, Ruimin Mu, Daoji Wu, Heng Liang, Xiaoxiang Cheng
Summary: A novel strategy coupling ferrate and sodium percarbonate was proposed to improve ultrafiltration (UF) performance and alleviate membrane fouling resulted by algal foulants. The coupling process activated ferrate to generate high-valent intermediates, which played a crucial role in high-efficiency oxidation for algal foulants. The collaborative effect of ferrate and sodium percarbonate increased the terminal specific flux and reduced fouling resistances.
Article
Green & Sustainable Science & Technology
Jianbo Liu, Faqian Sun, Panyue Zhang, Yan Zhou
Summary: The study introduced a novel APQ bead technology, which effectively alleviated MBR biofouling by reducing concentrations of EPS and AHL, extending operational period. This technology showed potential for biofouling control.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Environmental Sciences
Mengge Fan, Xin Yang, Qingqing Kong, Yu Lei, Xinran Zhang, Ehsan Aghdam, Ran Yin, Chii Shang
Summary: The study demonstrated the effectiveness of the sequential ClO2-UV/chlorine process in removing micropollutants and controlling the formation of disinfection byproducts(DBPs). ClO2 pretreatment significantly reduced the formation of DBPs during the UV/chlorine process.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Environmental
Lee Jiwoo, Daeeun Kwon, Jeonghwan Kim
Summary: This study compared the fluidization of granular activated carbon in an AFMBR and the biogas sparging from the bottom of a G-AnMBR for treating low-strength wastewater. The results showed that AFMBR achieved high organic removal efficiency, methane production, and removal of organic micropollutants, while G-AnMBR had lower efficiency but lower energy consumption.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2021)
Article
Biotechnology & Applied Microbiology
Hua-Jun Feng, Long Chen, Xian-Bin Ying, Sheng-Song Yu, Yang-Cheng Ding
Summary: The effects of PAC with different redox properties on membrane fouling were investigated, and it was found that PAC with reductive properties could prolong the filtration cycle and enhance the anti-fouling performance mainly by reducing the content of extracellular polymer substances and soluble microbial products in the solution.
APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
(2022)
Article
Engineering, Environmental
Linda Li, Wayne Parker
Summary: The study assessed the performance of anaerobic membrane bioreactors (AnMBRs) at low temperatures commonly found in temperate climates (10-24 degrees C). It was found that as temperature decreased, COD removal and membrane fouling deteriorated. Addition of PAC reduced permeate VFA concentrations and mitigated membrane fouling at 10 degrees C.
WATER ENVIRONMENT RESEARCH
(2021)
Article
Environmental Sciences
Marina Gutierrez, Andrea Ghirardini, Michela Borghesi, Stefano Bonnini, Dragana Mutavdzic Pavlovic, Paola Verlicchi
Summary: This study analyzes the removal efficiencies of a large number of micropollutants in wastewater treated in a membrane bioreactor coupled with powdered activated carbon (PAC). The study discusses the influence of operational parameters and compound physico-chemical properties on the removal mechanisms. Statistical analysis suggests that micropollutant charge and LogD(ow) play the most important role in the removal mechanisms occurring in MBR coupled with PAC.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Environmental
Yongji Zhang, Xiaotong Wang, Hexiu Ye, Lingling Zhou, Zhiling Zhao
Summary: PAC-MBRs have shown to reduce transmembrane pressure by 25% compared to MBRs, indicating effective fouling control. Addition of PAC resulted in redistribution of resistances, with the dominant resistance shifting from filtration to cake resistance. Analysis showed that PAC altered microbial species on the membrane and reduced adsorption of organic molecules, making it easier to clean contaminated membranes with alkaline solutions.
WATER SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Chemical
Jiajian Xing, Lei Du, Xie Quan, Xinsheng Luo, Shane A. Snyder, Heng Liang
Summary: The combination of chlor(am)ine-UV oxidation and ultrafiltration enhances membrane system performance, increases wastewater reuse efficiency, prevents membrane fouling accumulation, improves removal of organic and inorganic substances, and modifies characteristics of dissolved organic matter for better water quality and safety.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Environmental Sciences
Jinchuan Lian, Xiaoxiang Cheng, Xuewu Zhu, Xinsheng Luo, Jingtao Xu, Fengxun Tan, Daoji Wu, Heng Liang
Summary: In this study, ferrate (Fe(VI)) and calcium sulfite (CaSO3) were combined to improve ultrafiltration (UF) performance in surface water treatment. The combination of Fe(VI) and CaSO3 generated various active species, effectively eliminating fluorescent components. Dissolved organic carbon and UV254 were significantly reduced with Fe(VI)/CaSO3 = 0.05/0.15 mM. After UF, the removal rate for these parameters were further improved. The UF stage also resulted in reduced fouling and improved membrane performance.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Engineering, Environmental
Jinxu Nie, Huaguan Huang, Peng Rao, Hao Chen, Xing Du, Zhihong Wang, Wenxiang Zhang, Heng Liang
Summary: A composite functional particle enhanced gravity driven ceramic membrane bioreactor (GDCMBR) was developed to address the emergence of ammonia and phosphorus in groundwater. The GDCMBR showed enhanced bacteria enrichment and nitrogen and phosphorus removal, resulting in desirable effluent quality. The particles in GDCMBR can be quickly transferred to promote flux and achieve sustainable water purification efficiency.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Green & Sustainable Science & Technology
Huarong Yu, Boyan Lai, Haiyang Yang, Hongwei Rong, Heng Liang, Fangshu Qu
Summary: Global warming and the energy crisis have led to an increased demand for renewable energy production and resource recovery. This study proposed a novel method for evaluating methanogenesis in anaerobic wastewater treatment by determining coenzyme F420 using front-face excitation-emission matrix (FF-EEM) fluorescence spectroscopy. The results showed that the FF-EEM-based method was simpler and more accurate than conventional F420 measurement. The study demonstrated that the FF-EEM-based method could effectively evaluate methanogenesis in anaerobic processes and assist in optimizing bioresource recycling in wastewater treatment.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Engineering, Environmental
Haiqing Chang, Naiming Liu, Fangshu Qu, Xiaoxiang Cheng, Zhiwei Zhou, Ying Liang, Ying Yu, Heng Liang
Summary: This study evaluated the alleviation of membrane fouling for the treatment of shale gas produced water (SGPW) using sodium percarbonate oxidation and aluminum sulfate coagulation. The results showed that the combination of oxidation and coagulation effectively reduced turbidity, UV254, and DOC, as well as fluorescent organics in the SGPW samples. The normalized fluxes were significantly improved compared to the raw SGPW, indicating the potential of this combined pretreatment process in controlling membrane fouling.
CHEMICAL ENGINEERING JOURNAL
(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
Environmental Sciences
Jun Liu, Xushen Han, Xuewu Zhu, Jun Li, Dan Zhong, Liangliang Wei, Heng Liang
Summary: This study systematically evaluated the granulation, long-term operation, storage, and reactivation processes of aerobic granular sludge (AGS) technology in sequencing batch reactors (SBRs). The relationships between microbial diversity, granular size, and characteristics were also investigated. The results showed that Proteobacteria and Bacteroidetes were the dominant phyla, and certain genera such as Flavobacterium, Acinetobacter, Azoarcus, and Chryseobacterium had varying abundances in different stages or granular sizes. Microbial immigration was found to be significant in various stages, and microbial diversity had a linear relationship with COD/MLVSS ratio. However, there was no linear relationship between microbial diversity and granular size, indicating similar microbial diversity in different-sized AGS. Overall, COD/MLVSS played a key role in microbial evolution compared to sludge traits. This study contributes to future research on AGS.
ENVIRONMENTAL RESEARCH
(2023)
Article
Engineering, Chemical
Yanrui Wang, Hailin Chang, Shu Jiang, Jialong Chen, Jinlong Wang, Heng Liang, Guibai Li, Xiaobin Tang
Summary: The interfacial polymerization process between piperazine (PIP) and trimesoyl chloride (TMC) was effectively regulated using a weak-polar organic solvent of ethyl formate (EF) to fabricate polyamide (PA) nanofiltration (NF) membranes with high ion selectivity and water permeability. Molecular dynamics (MD) simulation revealed that EF involvement reduced interfacial tension and facilitated the diffusion of amine monomers into the organic phase, resulting in a PA film with higher crosslinking degree. The optimized PA NF membranes exhibited efficient rejection for divalent anions and cations, and high mono/divalent ion selectivity at sub-angstrom size.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Engineering, Chemical
Zihan Liu, Junwen Ding, Shirong Li, Longfeng Hu, Heng Liang, Langming Bai
Summary: This study proposes a strategy for designing graphene oxide (GO) composite membranes for dye/salt separation in textile wastewater. By incorporating polyaniline (PANI) particles and using alkali treatment, the membrane shows higher flux and rejection rates compared to GO membrane, making it an effective solution for desalination of textile wastewater.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Engineering, Chemical
Zihui Wang, Langming Bai, Jinlong Wang, Heng Liang, Guibai Li
Summary: In this study, a photo-assisted crosslinked NF membrane with a regulated interlaced stripe surface morphology was fabricated. The optimal membrane with AMPS molecules carrying sulfonyl groups crosslinked in the PA network showed improved water permeability, fouling resistance, and chlorine tolerance.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Engineering, Chemical
Zi Wang, Rui Zhao, Heng Liang, Guibai Li, Langming Bai
Summary: Modified thin-film nanocomposite (TFN) membranes were constructed by incorporating molybdenum disulfide (MoS2) nanosheets into the polyamide layer or as an interlayer, addressing the trade-off effect and membrane fouling challenges in brackish water desalination. The modified membranes exhibited improved separation performance and antifouling property while maintaining salt rejection and permeability.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Engineering, Chemical
Jiaxuan Yan, Langming Bai, Jing Zhao, Yatao Liu, Hesong Wang, Han Zhang, Guibai Li, Heng Liang
Summary: In order to control the ultrafiltration membrane fouling caused by secondary effluent, cobalt oxide loaded activated carbon (CoOx-PAC) activating peroxymonosulfate (PMS) was used as a pretreatment. The degradation of natural organic matter (NOM) and the mitigation performance of membrane fouling for the CoOx-PAC/PMS pretreatment were investigated. The results showed that the CoOx-PAC/PMS pretreatment had excellent degradation on NOM and significantly improved the specific flux, reducing both reversible and irreversible membrane fouling resistance.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Engineering, Chemical
Lu Zhao, Liang Liu, Xiao-Feng Bai, Ai-Yong Zhang, Shu-Chuan Peng, Chi Zhang, Hai-Hong Niu, Heng Liang
Summary: This study investigates the synergistic effect between defective sulfur vacancy and metallic 1T phase in Fenton-like catalysis on two-dimensional MoS2. Sulfur-defected 1T-MoS2 catalysts were prepared and exhibited superior catalytic performance in PMS activation and pollutant degradation. The accelerated electron transfer within the metallic 1T phase contributes to the activation of PMS and pollutant degradation on the defective sulfur vacancies.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Engineering, Chemical
Jinlong Wang, Jian Jiao, Jianlei Duan, Chuandong Wu, Jiaxuan Yang, Jing Zhao, Hesong Wang, Yu Tian, Guibai Li, Heng Liang
Summary: A two-step ion exchange membrane electrolysis process was designed for the recovery of divalent cations and sulfate from nanofiltration concentrates, and the removal performance and membrane fouling mechanism were investigated.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Environmental
Han Zhang, Weijia Gong, Ying Xue, Weichen Zeng, Langming Bai, Guibai Li, Heng Liang, How Yong Ng
Summary: Simulated-sunlight assisted MABR (L-MABR) can enhance the removal efficiency of sulfamethoxazole (SMX) and reduce the production of antibiotic resistance genes (ARGs). Photolysis dominates the SMX removal in L-MABR, with the help of ultraviolet (UV) and reactive oxygen species (ROS) to accelerate the degradation process of SMX.
Review
Engineering, Chemical
Yingyuan Zhu, Haiqing Chang, Zhongsen Yan, Caihong Liu, Ying Liang, Fangshu Qu, Heng Liang, Radisav D. Vidic
Summary: This comprehensive review summarizes the practical applications and mass transfer models of ammonia recovery from wastewater using membrane distillation and membrane contactor technologies. The review found that the operating conditions played a significant role in ammonia removal, while the characteristics of the feed and permeate solutions had a relatively smaller impact. The characteristics of the membrane and devices were of great interest in research.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
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.