Article
Environmental Sciences
Chanchan Shen, Ying Wang, Jun Fu
Summary: Urchin-like Co3O4 anchored on reduced graphene oxide showed excellent activity in peroxymonosulfate activation for ibuprofen degradation. The dosage of Co3O4-rGO, IBU concentration, PMS concentration, and pH had influences on the removal of IBU and total organic carbon. The valence state conversion of Co2+/Co3+ was identified as the critical PMS activation mechanism.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Engineering, Environmental
Yu Yin, Mengxuan Liu, Lei Shi, Shu Zhang, Rajan Arjan Kalyan Hirani, Chengzhang Zhu, Chuanxiang Chen, Aihua Yuan, Xiaoguang Duan, Shaobin Wang, Hongqi Sun
Summary: Ru species loaded on 2D graphitic carbon nitride material exhibited excellent catalytic activity for organic compound removal. The dispersion degree of Ru was crucial to the catalytic performance, achieved by optimizing the preparation process and obtaining Ru-pCN catalysts with homogeneous dispersion of Ru species.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Engineering, Environmental
Jiangwei Shang, Shuwen Fan, Shihu Cao, Xinrui Gan, Jing Nie, Tianning Zhang, Xiangchen Li, Dan Feng, Xiuwen Cheng
Summary: In this study, a CuCo2S4 microporous composite membrane (CCSM) was prepared and used to activate PMS for the degradation of carbamazepine (CBZ). The CCSM/PMS system exhibited admirable catalytic performance, efficiently degrading CBZ and other antibiotics. Furthermore, the CCSM showed good recyclability.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Engineering, Environmental
Zhiying Li, Fei Wang, Yimei Zhang, Yuxian Lai, Qinglu Fang, Yaxiao Duan
Summary: In this study, a CuFe2O4-CoFe2O4 metallic oxides catalyst CCF synthesized by solvothermal method was applied to degrade BPA by activating PMS, showing superior catalytic activity and stability. The systematic investigation on various factors influencing the degradation efficiency of BPA confirmed the potential of CCF in practical wastewater treatment.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Physical
Anh Quoc Khuong Nguyen, Yong-Yoon Ahn, Gwanyong Shin, Younsang Cho, Jonghun Lim, Kitae Kim, Jungwon Kim
Summary: In this study, high-efficiency stable CoWO4 nanoparticles were synthesized as peroxymonosulfate (PMS) activators for water treatment by adjusting the pH during hydrothermal synthesis. The CoWO4_10 catalyst showed the highest degradation efficiency for 4-chlorophenol and the highest stability for metal ion leaching, making it a practical PMS activator. This study provides a simple strategy for the development of highly efficient and stable bimetallic oxides that can be utilized in various fields.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Engineering, Chemical
Caixia Fu, Miao Yan, Hongrui Ma, Shuwen Zhang, Ge Yang, Hailin Tian, Jingxin Yang, Zhongming Wang, Shunni Zhu, Kalpana Bhatt, Wei Song
Summary: In this study, copper-based heterogeneous catalysts were used to degrade synthetic organic compounds (SOCs) in a PMS system, and significant effects were achieved. Various reactive species, including SO4•, •OH, and 1O2, were confirmed to be generated in the CuO/PMS system, and both radical and non-radical reactions were involved. The different valence states of copper had different contributions to the degradation of different SOCs. Furthermore, the influence of different reaction parameters on SOCs degradation was explored. The results of this study demonstrate that CuO can serve as an efficient heterogeneous activator, providing a sustainable and promising technology for water environment protection.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2023)
Article
Chemistry, Multidisciplinary
Elvira Gomez, Arnau Fons, Roberto Cestaro, Albert Serra
Summary: In this study, efficient heterogeneous catalysts with multiple active sites were successfully synthesized for the activation of peroxymonosulfate (PMS) to degrade persistent organic pollutants. The CoNi-based catalysts, fabricated through a cost-effective and eco-friendly process, demonstrated exceptional efficiency in the degradation and mineralization of tetracycline. The effects of various factors on the degradation and mineralization processes were also investigated.
Article
Engineering, Environmental
Ye Du, Wen-Long Wang, Zhi-Wei Wang, Chang-Jie Yuan, Ming-Qi Ye, Qian-Yuan Wu
Summary: Byproduct formation during sulfate radical-based processes like UV/PMS has raised concern. This study found that both PMS alone and UV/PMS can increase the toxicity of wastewater, while UV/H2O2 decreased the toxicity.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Hien Thi Nguyen, Sawaira Adil, Kyungjin Cho, Seongpil Jeong, Eun-Ju Kim
Summary: This study investigated the removal of carbamazepine from water using a metal ions/peroxymonosulfate system and a single soil bacteria strain in groundwater conditions. The biological process involving Pseudomonas jinjuensis significantly decreased the residual CBZ in pre-treated water by using laccase activity and cell adsorption. The dual process of ferrous iron-activated PMS pretreatment and biological process showed a potential for removing CBZ in groundwater, with approximately 83.6% of CBZ being removed under aerobic conditions and 1.7 mu M under anoxic conditions.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Engineering, Environmental
Boji Wang, Yao Zhang, Yuyang Qin, Hongjing Li
Summary: Fe(II)/Peroxymonosulfate (PMS) pre-oxidation enhanced coagulation can effectively remove algal cells and reduce algal organic matter content, providing a promising method for controlling Microcystis aeruginosa in eutrophic water.
CHEMICAL ENGINEERING JOURNAL
(2021)
Review
Engineering, Environmental
Pooi-Ling Koo, Nur Farhana Jaafar, Pow-Seng Yap, Wen-Da Oh
Summary: This review provides an overview of the development of perovskite as a crucial PMS activator and its application in the removal of anthropogenic organic pollutants. The synthesis methods are discussed briefly, and the application of various perovskites as PMS activators is critically evaluated. Future directions for the development of perovskite as a PMS activator are identified.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Engineering, Environmental
Anam Asghar, David Kniesel, Mohaned Hammad, Ahmed K. Al-kamal, Doris Segets, Hartmut Wiggers, Torsten C. Schmidt
Summary: In this study, acid-treated graphene catalyst (Gr-COOH) was synthesized and its performance in different combinations of ozone and ozone activated peroxymonosulfate was evaluated. The results showed that heterocatalytic ozone-based activation of peroxymonosulfate performed efficiently at neutral and alkaline conditions. The synergistic effects of the oxidative processes were also tested, showing that the O3 + PMS + Gr-COOH process achieved the best performance in removing atrazine and nitrobenzene.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Engineering, Environmental
Chengming Xiao, Ming Zhang, Chaohai Wang, Xin Yan, Hao Zhang, Saisai Chen, Yiyuan Yao, Junwen Qi, Shengtian Zhang, Jiansheng Li
Summary: In this study, hollow Co/NC sheets with enhanced performance for pollutant degradation were successfully synthesized by pyrolysis of polydopamine-coated Zn/Co zeolite imidazole framework. The resulted material showed significantly improved degradation efficiency when used as a catalyst to activate peroxymonosulfate for bisphenol A degradation.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Physical
Yanxi Chen, Jieqiong Kang, Zhenjie Li, Mingshan Zhu, Renli Yin
Summary: An economic Co2P catalyst was constructed for PMS activation, which showed efficient degradation of carbamazepine (CBZ) with a removal ratio of 98% in 10 min. The catalyst promoted the formation of electron-rich Co center, supplying electrons for PMS activation and producing reactive radicals (SO4- and ·OH) for CBZ degradation. The study also investigated the impact of water matrix, catalyst dosage, and pH variation, and proposed three degradation pathways of CBZ with predicted toxicity of the intermediates.
SURFACES AND INTERFACES
(2023)
Review
Green & Sustainable Science & Technology
Jingwen Sun, Ting Wu, Zhifeng Liu, Binbin Shao, Qinghua Liang, Qingyun He, Songhao Luo, Yuan Pan, Chenhui Zhao, Danlian Huang
Summary: This paper reviews the advantages, mechanisms, and influencing factors of peroxymonosulfate (PMS) activation induced by spinel ferrite nanoparticles (NPs) and their nanocomposites (NCs) for organic pollutant removal. The challenges and directions for improvement are also discussed.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Chemistry, Physical
Xiaowen Xie, Jiachun Cao, Yongjie Xiang, Ruijie Xie, Ziyi Suo, Zhimin Ao, Xin Yang, Haibao Huang
Summary: MoS2 cocatalyst greatly enhances the deep oxidation of aromatic VOCs by promoting Fe3+/PMS reaction and activating O2 into radicals. The Fe3+/PMS/MoS2 system exhibits strong catalytic ability for various VOCs degradation at a wide pH range.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Article
Engineering, Environmental
Shuangshuang Cheng, Yujie Zhao, Yanheng Pan, Jinpeng Yu, Yu Lei, Xin Lei, Gangfeng Ouyang, Xin Yang
Summary: Dissolved organic matter (DOM) inhibits the degradation of ADN in advanced oxidation processes by competing for photons, scavenging reactive oxygen species, and converting intermediate radicals back into ADN. The quenching rate constants of ADN radicals by DOM are positively correlated with its total antioxidant capacity. The diverse roles of DOM should be considered in predicting the abatement of TrOCs in advanced oxidation processes.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
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, Environmental
Jiadong Peng, Huang Huang, Yu Zhong, Ran Yin, Qianyuan Wu, Chii Shang, Xin Yang
Summary: This study investigated the transformation of dissolved organic matter (DOM) and the removal of nitrogenous disinfection byproduct (N-DBP) precursors during different types of biological wastewater treatment processes. The results showed that DOM fractions with different molecular weights exhibited varying degrees of biodegradability, with smaller molecules being more difficult to remove. Complete nitrification was found to be beneficial in removing small amino sugar-like and protein-like molecules, but the removal of haloacetonitrile (HAN) precursors was challenging. The abundance of low-molecular-size protein-like substances was significantly correlated with the formation potential of halonitromethane (HNM), N-nitrosamine (NA), and total N-nitrosamine (TONO) in post-chloramination.
Article
Engineering, Environmental
Juan Li, Gabriela Scheibel Cassol, Jing Zhao, Yugo Sato, Binghua Jing, Yuliang Zhang, Chii Shang, Xin Yang, Zhimin Ao, Guanghao Chen, Ran Yin
Summary: This study demonstrates that chlorine dioxide and sulfite can rapidly degrade diverse micropollutants under environmentally relevant conditions. The reaction mechanism between chlorine dioxide and sulfite is explored, and a novel process for micropollutant abatement in water and wastewater is highlighted.
Article
Engineering, Chemical
Xiaowen Xie, Yongjie Xiang, Jiachun Cao, Wenjing Dai, Zhimin Ao, Haibao Huang, Xin Yang, Fei Xiao, Xinguo Ye
Summary: This study investigates the degradation of a toxic aromatic VOC (AVOC) mixture using MoS2 cocatalytic Fe3+/PMS reaction. Different pollutants in the mixture significantly affect the degradation efficiency of AVOCs, and the involvement of molecular O2 shortens their degradation pathways.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Engineering, Environmental
Xin Yang, Anna Wang, Zhechao Hua, Wenrui Wei, Yilong Cao, Bingyue Fu, Shuping Chen, Zijun Dong, Jingyun Fang
Summary: This study investigated the roles of diverse free available chlorine (FAC) species including HOCl/OCl-, H2OCl+, Cl2O, and Cl-2 in the degradation of micropollutants. The reaction orders in FAC (n) of 5 micropollutants ranged from 1.4 +/- 0.2 to 2.1 +/- 0.3 at pH 3-5, demonstrating the importance of Cl2O and Cl-2. A simplified method for determining the rate constants (k) of specific FAC species with micropollutants was developed. Cl-2 and Cl2O played vital roles in both micropollutant degradation and disinfection byproduct (DBP) formation during chlorination.
Article
Engineering, Environmental
Jianglin Peng, Yanheng Pan, Yangjian Zhou, Qingqing Kong, Yu Lei, Xin Lei, Shuangshuang Cheng, Xinran Zhang, Xin Yang
Summary: Wastewater effluent is a significant source of extracellular antibiotic resistance genes (eArGs) in water environments, posing a threat to human health and biosecurity. The study found that organic matter in the wastewater effluent (EfOM) contributes to photosensitized oxidation of eArGs, with the triplet states of EfOM dominating the degradation process. The photo-oxidation mainly occurs through proton-coupled electron transfer reactions, breaking plasmid strands and damaging bases. This research enhances our understanding of the role of EfOM in the photo-oxidation of eArGs and the differences between EfOM and terrestrial-origin natural organic matter.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Yingying Zhou, Jia-jia Jiao, Huang Huang, Yong Dong Liu, Rugang Zhong, Xin Yang
Summary: This study investigated the formation mechanisms of dichloroacetonitrile (DCAN) from long-chain primary amines, amino acids, and dipeptides during chlorination. It was found that nitriles are initially generated, followed by beta-C-hydroxylation and alpha-C-chlorination processes, leading to the formation of DCAN through C-alpha-C-beta bond cleavage. The presence of carbonyl, aromatic, and -OH groups in the precursors significantly facilitates DCAN formation. This study provides important insights into the C-C bond cleavage mechanism in the formation of DCAN.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Yu Lei, Yafei Yu, Xin Lei, Xi Liang, ShuangShuang Cheng, Gangfeng Ouyang, Xin Yang
Summary: Advanced oxidation processes (AOPs) are widely used for water and wastewater treatment. This study determined second order rate constants for reactions between probes and quenchers with various reactive species and chemical oxidants. Previously ill-quantified reactions were found to be favorable. The improved kinetic database and proposed criteria for probe and quencher selection and dosing will benefit future research in AOPs and other radical-involved reactions.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
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
Engineering, Environmental
Jiakai Qiu, Jing Wang, Mingzhu Ren, Xin Yang, Jianbo Zhang, Xiaolong Zhang, Hongbin Cao, Yongbing Xie
Summary: This paper investigated the effect of chloride ion (Cl-) on the degradation of organic compounds. It was found that Cl- affects the degradation by transforming center dot OH to reactive chlorine species (RCS). The competition between organics and Cl- for center dot OH determines their consumption rate, which depends on their concentration and reactivity. The study also showed that Cl center dot had no significant contribution to the degradation of organics, possibly due to its reaction with ozone.
Article
Engineering, Environmental
Yangjian Zhou, Lacuo Yixi, Qingqing Kong, Jianglin Peng, Yanheng Pan, Junlang Qiu, Xin Yang
Summary: The consumption of tire rubber antioxidant 6PPD has caused contamination in aquatic environments, and its transformation product 6PPD-Q is highly toxic to aquatic organisms. This study reveals the transformation of 6PPD to 6PPD-Q in water under sunlight irradiation and the underlying mechanisms involved. The results confirm the significant formation of 6PPD-Q from 6PPD under simulated sunlight in water, providing insights into the underestimated ecological risks of 6PPD.
ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS
(2023)
Article
Engineering, Environmental
Zhang Yan, Wenjian Kuang, Yu Lei, Wenxiao Zheng, Hengyi Fu, Han Li, Zhenchao Lei, Xin Yang, Shishu Zhu, Chunhua Feng
Summary: This study develops a wet chemistry approach to synthesize BiOCl-functionalized MMO electrodes for electrochlorination of ammonium in wastewater treatment. The BiOCl@MMO anode exhibits higher chlorine generation, Faradaic efficiency, and NH4+ oxidation rate compared to the pristine MMO anode.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Analytical
Xi Liang, Yu Lei, Xin Yang
Summary: In this study, quantitative structure-activity relationships (QSARs) were developed to predict the reaction rate constants between trace organic contaminants and radicals involved in advanced oxidation processes. The developed QSARs show a good predictive performance and can be useful in evaluating the degradation of contaminants during wastewater treatment.
ENVIRONMENTAL SCIENCE-PROCESSES & IMPACTS
(2023)
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.
