Article
Engineering, Environmental
Yuanqing Guo, Heng Liang, Guibai Li, Daliang Xu, Zhongsen Yan, Rui Chen, Jing Zhao, Xiaobin Tang
Summary: The use of solar-activated PDS pretreatment efficiently degrades organic pollutants and reduces fouling in UF membranes, especially when dealing with Songhua River water. Both solar light and heating effects contribute to PDS degradation of natural organic matters, with correlations found between UV254, DOC, and membrane fouling indexes.
Article
Environmental Sciences
Ying Wan, Pengchao Xie, Zongping Wang, Jingwen Wang, Jiaqi Ding, Raf Dewil, Bart Van der Bruggen
Summary: The study shows that UV/chlorine pretreatment can effectively mitigate membrane fouling from different NOM fractions. Increasing chlorine dose can further improve the fouling reduction. The reduction of molecular weight of organic compounds and decomposition of unsaturated organic species are the main reasons for alleviating membrane fouling.
Article
Environmental Sciences
Zixiao Ren, Haiyan Cao, Peter Desmond, Bingsheng Liu, Huu Hao Ngo, Xu He, Guibai Li, Jun Ma, An Ding
Summary: The retention of viruses during the UF process can be predicted based on our study results.
Article
Engineering, Chemical
T. Mantel, P. Benne, M. Ernst
Summary: The application of electrical potential and duplex-coating technique on ultrafiltration membranes can significantly improve membrane performance, reduce fouling, increase rejection rates, and simplify module design. This approach enhances efficiency and reliability of water treatment systems by introducing additional electric fields through the membranes themselves.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Jiaqi Ding, Haoliang Xiao, Xiaolong Huang, Yujia Zou, Zhimin Ye, Songlin Wang, Pengchao Xie, Yongsheng Chen, Jun Ma
Summary: This study proposes a novel heat-activated peroxydisulfate (heat/PDS) process for cleaning membrane fouling caused by humic acid (HA). The combination of heat and PDS can achieve almost 100% recovery of permeate flux by changing the HA structure and enhancing foulant detachment from membranes. The properties of treated membranes are characterized, and the results demonstrate the effective removal of reversible and irreversible foulants by heat/PDS cleaning. The heat/PDS method shows comparable performance to NaClO in membrane cleaning and provides high performance in removing fouling caused by different substances, suggesting its potential as an alternative for practical membrane cleaning.
CHINESE CHEMICAL LETTERS
(2023)
Article
Engineering, Environmental
Yatao Liu, Quan Lin, Yuanqing Guo, Jing Zhao, Xinsheng Luo, Han Zhang, Guibai Li, Heng Liang
Summary: The study introduced nitrogen-doped multi-walled carbon nanotubes (N-MWCNTs) into membrane technology for peroxymonosulfate (PMS) activation, showing enhanced permeability and catalytic degradation properties. The coupling of N-MWCNTs with PMS activation demonstrated effective removal of organic pollutants and reduction of membrane fouling, offering promising prospects for improving water quality and overcoming fouling barriers.
Article
Environmental Sciences
Xing Zheng, Muhammad Tariq Khan, Xin Cao, Jean-Philippe Croue
Summary: This study compared the chemical properties and fouling potential of biopolymers extracted from secondary wastewater effluent and surface water during ultrafiltration. It was found that EfOM biopolymers were enriched in protein structures and caused more irreversible fouling compared to NOM biopolymers. Additionally, the presence of divalent cations increased the irreversibility of fouling, with a more significant impact on NOM fouling.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Engineering, Chemical
Hesong Wang, Jinlong Wang, Jing Zhao, Han Zhang, Luming Liu, Xueying Sun, Guibai Li, Heng Liang
Summary: As an emerging MOF material, MIL-101(Cr) demonstrates a high NOM adsorption capacity and can improve permeate quality in both separation mode (SM) and coating mode (CM). MIL-101(Cr) influences membrane fouling behaviors and has a dual role in the integrated system, reducing fouling but also causing additional filtration resistance. The 7C-7C interactions and salt-bridges between MIL-101(Cr) and NOM play a dominant role in adsorption. SM is more efficient in mitigating membrane fouling, while CM achieves the same permeate quality with less MIL-101(Cr) usage and reaction time. This study provides a scientific basis for the widespread application of MOFs.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Engineering, Environmental
Bin Liu, Jun Yin, Jun Wu, Xiaoxiang Cheng, Kaihan Yang, Guangchao Li, Zhou Shi
Summary: The study found that UV/ClO2 pretreatment can effectively alleviate ultrafiltration membrane fouling, improve membrane hydrophilicity and interfacial free energy. It can also remove organic pollutants and fluorescent components, but may lead to the deterioration of dissolved organic carbon in the permeate.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Engineering, Environmental
Zhaohui Zhang, Tong Zhang, Liang Wang, Mengmeng Chen, Bin Zhao, Junjing Li, Cong Ma, Xiuru Chu, Pengda Zhang
Summary: Free transparent exopolymer particles (TEP) play a significant role in irreversible membrane fouling when treating algae-laden water. A study found that the integrated process of magnetic anion exchange resin (MIEX)/ultrafiltration (UF) effectively reduces the irreversible fouling caused by free TEP. The experimental results suggest that the MIEX dynamic layer contributes the most to alleviating irreversible membrane fouling during the MIEX/UF process.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Engineering, Chemical
Kuo Gao, Tian Li, Qingqing Zhao, Wan Liu, Junxia Liu, Yali Song, Huaqiang Chu, Bingzhi Dong
Summary: This study comprehensively examined the UF fouling behavior of EOMs from three typical algae species in both mono-culture and co-culture conditions. The results showed that the UF performance was significantly affected by certain substances in the EOMs, and the co-cultures displayed unique promotion and inhibition characteristics. Additionally, the membrane filtration behavior varied among different algae combinations, with some combinations leading to more serious fouling than others.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Polymer Science
Iva Curic, Davor Dolar, Josip Horvat, Katia Grgic
Summary: The influence of textile wastewater secondary effluent on the characteristics of ultrafiltration membranes was investigated, showing changes in membrane properties and the formation of fouling layers, with larger pore size membranes exhibiting a greater decrease in permeate flux during treatment.
Review
Engineering, Environmental
Christian D. Peters, Tony Rantissi, Vitaly Gitis, Nicholas P. Hankins
Summary: Natural organic matter (NOM) is a common issue in water treatment systems, which can be removed through early-stage membrane processes like ultrafiltration (UF) but may lead to UF membrane fouling. Recent studies have focused on enhancing NOM retention and mitigating membrane fouling in UF systems. Multi-process solutions are considered the most promising approach for addressing these challenges.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Engineering, Environmental
Xiao-Tong Yuan, Lei Wu, Hong-Zhang Geng, Luda Wang, Wenyi Wang, Xue-Shuang Yuan, Benqiao He, Yi-Xuan Jiang, Yu-jie Ning, Ze-Ru Zhu, Jianxin Li
Summary: Introducing polyaniline nanofibers can enhance the anti-fouling performance and tensile strength of polysulfone membranes, improving overall membrane performance. Experimental results confirm that the blended membranes exhibit significant anti-fouling properties when filtering solutions containing albumin, humic acid, and sodium alginate.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Engineering, Environmental
Zhangzheng Wang, Ruhui Chen, Yunyun Li, Weiben Yang, Ziqi Tian, Nigel J. D. Graham, Zhen Yang
Summary: This study proposes an innovative approach of using elevated membrane cleaning temperature to reduce membrane fouling in the water treatment process. By increasing the temperature, residual hydrophobic-modified chitosan flocculant (TRC) can be induced to reduce membrane fouling in ultrafiltration.
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
Engineering, Environmental
Xiaoxiang Cheng, Yongrui Zhang, Qingshui Fan, Lin Wang, Shuai Shi, Xinsheng Luo, Xuewu Zhu, Daoji Wu, Heng Liang
Summary: In this study, a novel Co3O4@carbon nanotubes modified ceramic membrane (Co3O4@CNT-CM) was prepared for simultaneous catalytic peroxymonosulfate (PMS) oxidation and filtration of secondary effluent. The Co3O4@CNT catalyst showed good dispersibility and a large number of active sites, and the Co3O4@CNT-CM had a smooth surface, high permeate flux, and excellent catalytic PMS ability. The Co3O4@CNT-CM demonstrated enhanced antifouling and water purification performance in the treatment of secondary effluent.
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, Environmental
Shirong Li, Langming Bai, Junwen Ding, Zihan Liu, Guibai Li, Heng Liang
Summary: In this study, a nanofiltration membrane with a salt-responsive ion valve effect was developed by incorporating zwitterionic nanospheres. It overcame the limitation of high salt concentration on nanofiltration separation performance and achieved high selectivity for ion transport.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(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
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, Environmental
Yonghui Han, Jinlong Wang, Daliang Xu, Jialin Song, Hesong Wang, Xuewu Zhu, Xinsheng Luo, Liu Yang, Guibai Li, Heng Liang
Summary: The application of ultrafiltration technology in algae-laden water is limited due to membrane fouling. However, a Ferrate/FeSO4 pretreatment can improve the UF performance by increasing the agglomerative tendency of algal foulants and enhancing the removal effect of algal organics through in-situ generated Fe(III). This strategy effectively mitigates algal-source membrane fouling and improves the UF performance.
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)
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.
