Review
Engineering, Environmental
Liangjie Wang, Ke Xiao, Huazhang Zhao
Summary: This review summarizes the basic properties of singlet oxygen (1O2), its debated role in persulfate-based advanced oxidation processes (PS-AOPs), and the methods and drawbacks of identifying and evaluating its role. The aim is to better understand the role of 1O2 in PS-AOPs and facilitate its rational utilization.
Article
Multidisciplinary Sciences
Jing-Hang Wu, Fei Chen, Tian-Hao Yang, Han-Qing Yu
Summary: This study introduces a comprehensive kinetic examination method for spin-trapping EPR analysis to monitor the concentration of singlet oxygen (O-1(2)). It can avoid false-positive results and provide insights into the reaction mechanisms in catalytic oxidation processes.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Review
Engineering, Environmental
Xin Lei, Yu Lei, Xinran Zhang, Xin Yang
Summary: This review focuses on the degradation kinetics and mechanisms of disinfection byproducts (DBPs) under UV and solar irradiation and in UV-based advanced oxidation processes (AOPs). The study highlights the differences in photodegradation rates of N-nitrosamines and halogenated DBPs, and the potential predictors of photodegradation rates under low pressure UV irradiation. Additionally, the review summarizes the reaction mechanisms under UV irradiation and in HO center dot-mediated oxidation, providing insights into the degradation pathways of various DBPs.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Environmental Sciences
Carlos H. M. Fernandes, Bianca F. Silva, Jose M. Aquino
Summary: This study investigated two different advanced oxidation processes (AOP) for treating water contaminated with emerging contaminants. The results showed that both electrochemical methods and solar-based methods were effective in oxidizing and mineralizing the contaminants.
Article
Agricultural Engineering
Dongmei Bi, Mengqian Yin, Fupeng Huang, Jiawen Zhang, Weiming Yi
Summary: The evolution mechanism of EPFRs in three-component pyrolytic carbon was characterized using EPR spectroscopy. The types of EPFRs changed with increasing pyrolysis temperature, shifting from oxygen-containing free radicals to aromatic ring and polymeric aromatic radicals. The interaction between the three components did not significantly affect the concentration of EPFRs. This study provides guidance for the generation and regulation of EPFRs in biochar.
INDUSTRIAL CROPS AND PRODUCTS
(2023)
Review
Environmental Sciences
Huiling Xia, Chengwei Li, Guoying Yang, Zhiang Shi, Chenxi Jin, Wenzhi He, Jingcheng Xu, Guangming Li
Summary: This paper provides a detailed classification and comprehensive review of microwave-assisted advanced oxidation processes (MW-AOPs) in wastewater treatment. The latest applications of microwave in different advanced oxidation systems are discussed, along with the discussion of reaction parameters, performance, and operating costs of MW-AOPs. Recommendations for future research on MW-AOPs are also provided, highlighting the potential development and evolution of this technology.
Article
Engineering, Environmental
Yu-Jia Nong, Yi-Lin Zhang, Uwe Hubner, Wen-Long Wang, Qian-Yuan Wu, Nan Huang, Jorg E. Drewes, Hong-Ying Hu
Summary: In this study, VUV/UV and PDS were used to degrade carbamazepine. It was found that VUV/UV/PDS had more SO4 center dot- oxidation compared to VUV/UV and UV/PDS.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Biochemistry & Molecular Biology
Lionel Mignion, Celine M. Desmet, Evelyne Harkemanne, Isabelle Tromme, Nicolas Joudiou, Mohammad Wehbi, Jean-Francois Baurain, Bernard Gallez
Summary: This study explored the capability of low-frequency Electron Paramagnetic Resonance (EPR) to detect melanin in the human skin. The results showed that EPR could differentiate the EPR signal of melanin between melanoma and benign nevi, providing a new method for the diagnosis of pigmented skin lesions.
FREE RADICAL BIOLOGY AND MEDICINE
(2022)
Article
Biochemistry & Molecular Biology
Shengquan Huang, Ying Liu, Xuyuan Sun, Jinwei Li
Summary: The study used EPR and GC-MS techniques to analyze the variation of lipid free radicals and oxidized volatile products in four oils during thermal processing. The results showed that linseed oil had the highest signal intensities, while palm oil had the lowest. Furthermore, an artificial neural network model was established to accurately predict the free radicals in thermally oxidized oils.
Article
Environmental Sciences
Hannah Milh, Xingyue Yu, Deirdre Cabooter, Raf Dewil
Summary: In this study, the efficiency of UV-based sulfate radical advanced oxidation processes (SR-AOP) and UV-based advanced reduction processes (ARP) in degrading ciprofloxacin (CIP) in wastewater was investigated. It was found that the UV/PS process was more efficient than the UV/PMS process in SR-AOPs, while the UV/sulfite process was the most efficient among ARPs. The optimal process parameters and the contribution of different reactive species were determined for each process.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Chemistry, Analytical
Hideo Utsumi, Toshiki Masumizu, Ryoma Kobayashi, Tomoko Tahira, Fuminori Hyodo, Tatsuya Shimizu, Tatsuya Naganuma, Kazunori Anzai
Summary: Free radicals are key substances in organisms but can also cause oxidative diseases. Dynamic nuclear polarization- magnetic resonance imaging is a noninvasive imaging method that can be used for in vivo free radical imaging.
ANALYTICAL CHEMISTRY
(2021)
Review
Engineering, Environmental
Lihong Wang, Jin Jiang, Jun Ma, Suyan Pang, Tao Zhang
Summary: This review discusses the hot topic of cost-effective oxidation in the remediation of environmental pollutants, focusing on the role of copper species as efficient activators or catalysts and their application potential in polluted water remediation. The review also highlights approaches in literature to improve the performance of Cu(II)-initiated AOPs and methodologies for identifying intrinsic reactive species.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Physical
Sergei O. Liubimovskii, Leila Yu Ustynyuk, Alexander N. Tikhonov
Summary: Tiron is commonly used as a probe for detection of superoxide radicals. The interaction of Tiron with superoxide radicals dissolved in water solutions was studied using density functional theory (DFT) method. The reactions of Tiron with superoxide radicals are influenced by hydronium ions, leading to the formation of Tiron semiquinone radicals.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Editorial Material
Biochemistry & Molecular Biology
Toshihiko Ozawa, Ikuo Nakanishi
Summary: This commentary describes a highly cited paper published in the Archives of Biochemistry and Biophysics in 1980, which reviewed reports on spin trapping and hydroxyl radicals, contributing to the development of oxidative stress research.
ARCHIVES OF BIOCHEMISTRY AND BIOPHYSICS
(2022)
Article
Engineering, Environmental
Sie Alain Hien, Clement Trellu, Nihal Oturan, Alain Stephane Assemian, Bi Gouesse Henri Briton, Patrick Drogui, Kopoin Adouby, Mehmet A. Oturan
Summary: This study investigated the effects of different treatment methods on textile industry wastewater and found that combining EF with a BDD anode can efficiently remove TOC in a short period of time, while AO is more effective in controlling the formation of degradation by-products. A trade-off between TOC removal and the formation of toxic by-products should be considered during the treatment process.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Qiangwei Li, Mengmeng Zhang, Yongyi Xu, Xiaoqi Quan, Yiao Xu, Wen Liu, Lidong Wang
Summary: In this study, a heterogeneous catalyst system involving Co3O4 and TiO2 nanoparticles was constructed to degrade acetaminophen (ACE) through photocatalytic activation of sulfite. The unique heterojunction interface of Co3O4/TiO2 enabled a high degradation efficiency of ACE within 10 minutes. The roles of the engineered compositing interface were found to improve light absorption ability, facilitate the generation of active species, and optimize reactive pathways. The photocatalytic activation of sulfite system shows potential for the removal of pharmaceutical wastewater.
CHINESE CHEMICAL LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Yue Yuan, Zhikui Zhou, Xinyi Zhang, Xin Li, Yulu Liu, Shengtao Yang, Bo Lai
Summary: Microscale zero valent iron (mFe0) is a potential material for water pollution remediation, but the utilization of electrons released by mFe0 in the reduction of hexavalent chromium (Cr(VI)) is not satisfactory. Coating copper on the surface of mFe0 significantly improves the effective utilization of electrons released by mFe0.
CHINESE CHEMICAL LETTERS
(2023)
Article
Engineering, Environmental
Junjie You, Junyi Li, Heng Zhang, Mengfan Luo, Bo Xing, Yi Ren, Yang Liu, Zhaokun Xiong, Chuanshu He, Bo Lai
Summary: In this study, a g-C3N4 supported NiCx nanoclusters catalyst (NiCx-CN) was developed and its capability in activating peroxymonosulfate (PMS) was investigated. The mechanism investigation revealed that singlet oxygen (1O2) formed during the catalytic process had limited contribution to BPA elimination. Interestingly, high-valent nickel-oxo species (Ni&+=O) generated after the interaction of NiCx-CN and PMS were identified as the dominant reactive oxygen species (ROS). The prepared NiCx-CN also exhibited excellent resistance to interference from inorganic anions. Three BPA degradation routes were proposed based on the transformation intermediates. This study provides a new approach for the efficient degradation of organic pollutants using heterogeneous Ni-based catalysts through PMS activation via a nonradical mechanism.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Engineering, Environmental
Pengfei Gan, Yi Lu, Yunyi Li, Wen Liu, Long Chen, Meiping Tong, Jialiang Liang
Summary: An excitonic energy transfer (EET) based non-radical mechanism was proposed for the degradation of organic pharmaceuticals by g-C3N4 under visible light. The competition between single electron transfer (SET) and EET was studied, and the different mechanisms and degradation pathways were confirmed. The effect of humic acid (HA) on EET and SET was also explored, showing a distinct enhancement of EET and suppression of SET.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Engineering, Environmental
Xianhu Long, Hongle Shi, Rongfu Huang, Lingyun Gu, Yang Liu, Chuan-shu He, Ye Du, Zhaokun Xiong, Wen Liu, Bo Lai
Summary: In this study, sustainable Fe(III)/Fe(II) cycles in different inorganic peroxides activation systems were accelerated by using electro-catalysis (EC) as the electron donor. The electro-cocatalytic Fenton-like systems exhibited excellent degradation efficiency of sulfamethoxazole (SMX). Various reactive oxygen species (ROS) including hydroxyl radical ((OH)-O-center dot), singlet oxygen (O-1(2)), and sulfate radical (SO4 center dot-) were produced in EC/Fe(III)/PMS system, contributing to 38%, 37%, and 24% respectively. The dominant ROS in EC/Fe(III)/ PDS and EC/Fe(III)/HP processes was (OH)-O-center dot. The study provides a strong basis for constructing suitable systems to achieve different treatment requirements.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Engineering, Environmental
Zhongjuan Wang, Ye Du, Yanni Jiang, Jie Li, Chuanshu He, Yang Liu, Zhaokun Xiong, Bo Lai
Summary: This study found that ferrate could efficiently degrade fluoroquinolones, but their cytotoxicity to mammalian cells dramatically increased after reacting with ferrate. The research also revealed the important role of high-valent iron intermediates in the degradation of micropollutants.
ACS ES&T ENGINEERING
(2023)
Article
Chemistry, Physical
Xinhao Wang, Zhaokun Xiong, Hongle Shi, Zelin Wu, Bingkun Huang, Heng Zhang, Peng Zhou, Zhicheng Pan, Wen Liu, Bo Lai
Summary: Rationally regulating reaction mechanisms in Fenton-like reactions by tuning the properties of catalysts is challenging but significant. Various catalysts with different active center sizes were synthesized to realize the switching of reaction mechanisms and pollutant degradation routes in peroxymonosulfate (PMS) activation systems. The transformation of reaction mechanism from radical oxidation to nonradical oxidation was observed with the decrease of active center size. The toxicity tests indicated that the conversion from non-selective to selective oxidation resulted in lower toxicity of effluent after reaction, reducing environmental risks.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Engineering, Environmental
Kaiyuan Luo, Yang Shi, Rongfu Huang, Xipeng Wei, Zelin Wu, Peng Zhou, Heng Zhang, Yin Wang, Zhaokun Xiong, Bo Lai
Summary: This study demonstrated the efficient degradation of sulfisoxazole (SIZ) using N-doped iron-based porous carbon (Fe@N-C) as a catalyst to activate periodate (PI). The Fe@N-C catalyst exhibited high catalytic activity, stable structure, and excellent electron transfer activity. The non-radical pathway was identified as the dominant degradation mechanism, which was supported by scavenging experiments, electron paramagnetic resonance (EPR) analysis, salt bridge experiments, and electrochemical experiments. Fe@N-C mediated the electron transfer from organic contaminant molecules to PI, improving the efficiency of PI utilization. This study provides new insights into the application of Fe@N-C activated PI in wastewater treatment.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Engineering, Environmental
Liwei Yang, Fashan Yang, Heng Zhang, Hongyu Zhou, Mengfan Luo, Yunmei Liu, Chuanliang Zhao, Lu Zheng, Bo Lai
Summary: In this study, three different crystal forms of MnO2 were prepared and used to activate PI for pollutant degradation, revealing the potential mechanism and key active sites of MnO2 activation. The results showed that MnO2 with different crystal types exhibited different catalytic abilities, with the order of gamma-MnO2 > alpha-MnO2 > beta-MnO2. Experimental tests including quenching, EPR, Raman, and in situ electrochemical experiments confirmed that electron transfer-mediated non-free radical process was the main mechanism for pollutant degradation, and the highly active metastable intermediate complex (MnO2/PI*) was the active substance. Hydroxyl radical (HO·), superoxide radical (O2-), singlet oxygen (O1(^2)), and iodine radical (IO3·) did not participate in pollutant degradation. The quantitative structure-activity relationship analysis indicated that the catalytic performance of MnO2 was highly positively correlated with the surface Mn(IV) content, suggesting that surface Mn(IV) site was the main active site. Overall, this study provides valuable insights for the design and application of manganese dioxide activation for periodate degradation of pollutants.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Engineering, Chemical
Yi Ren, Chao Liu, Naiwen Li, Bo Lai, Jun Li
Summary: A new Fenton-like catalyst, FeCu/CN, was developed by incorporating iron and copper in polymeric graphitic carbon nitride (CN), which exhibited enhanced catalytic activity and reusability. The Fe7Cu3/CN catalyst system showed significantly higher pseudo-first-order rate constant for bisphenol S (BPS) degradation compared to monometallic catalyst systems. The new catalyst also demonstrated better performance for reuse, with BPS removal decreasing from 98.0% to 87.3% after five cycles. Hydroxyl radicals were identified as the main species for pollutant degradation, and the catalyst showed good performance for different pollutant removal and real wastewater treatment. This study provides a new catalyst with superior catalytic activity and favorable reusability, and contributes to the development of supported bimetallic catalysts.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Engineering, Chemical
Peng Zhou, Shuang Meng, Minglu Sun, Kunsheng Hu, Yangyang Yang, Bo Lai, Shaobin Wang, Xiaoguang Duan
Summary: A metal-free co-catalyst, amorphous boron (A-Boron), was used to overcome the slow kinetics of Fe-II regeneration and inactive Fe-III accumulation in Fenton-like peroxydisulfate (PDS) activation. The A-Boron/Fe-III/PDS system efficiently degraded bisphenol A (BPA) without performance decline for ten cyclic runs. Fe(IV) and radicals ((OH)-O-center dot and SO4 center dot-) were identified as the primary reactive species responsible for universal pollutants oxidation. QSAR study revealed a linear dependence between the kobs values of pollutants and their EHOMO. A-Boron bound with Fe-III species for catalytic reduction, while the semi-metallic surface of A-Boron underwent stepwise transformation, enabling long-lasting iron circulation.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Environmental Sciences
Chunyang Nie, Zhenhua Dai, Lijia Wan, Binghua Jing, Xiaoguang Duan, Shaobin Wang, Bo Lai, Zhimin Ao
Summary: Carbocatalyst/persulfate is a green, highly oxidative system for decontaminating refractory aqueous organic pollutants. The interfacial electric field (IEF) is used to alter the catalytic activity and selectivity of carbon/persulfate systems via the field-dipole effect. Positive IEF induces/reinforces the nonradical oxidation pathway, while different persulfate activation pathways can be induced under negative IEF. This work extends the application of the interfacial electric field in persulfate-based advanced oxidation processes.
Article
Engineering, Chemical
Boyu Huang, Long Chen, Maiwen Cao, Fengbin Sun, Xudong Yang, Fan Li, Wen Liu
Summary: This study developed a heterogeneous advanced oxidation process (AOP) for the degradation of the antibiotic norfloxacin (NOR) using peracetic acid (PAA) activated by cobalt sulfide materials. The optimized material (CoSx-2) efficiently activated the PAA system and achieved a high degradation efficiency of NOR. The study also investigated the catalytic mechanism and degradation pathways, providing a new perspective on enhancing PAA activation and removing emerging contaminants in water treatment.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Environmental
Jialiang Liang, Jingke Wu, Pengfei Gan, Yudan Liu, Peng Zhen, Yunyi Li, Zhiwei Zhao, Wen Liu, Meiping Tong
Summary: This study investigates the dephosphorization of dimethoate (DMT), a representative organophosphorus pesticide, using a vacuum ultraviolet system. It finds that non-radical processes, such as photoexcitation and singlet oxygen atoms (O(1D)), have a significant effect on DMT dephosphorization. The study highlights the significant contribution of non-radical pathways in DMT dephosphorization by VUV.
Article
Chemistry, Physical
Rongrong Ding, Guannan Zhou, Chuanshu He, Wenqiang Li, Yiran Wang, Xiaocheng Liu, Bo Lai, Yang Mu
Summary: This study highlights the influence of coexisting heavy metals on the degradation of contaminants during FeS oxygenation. The introduction of Co2+ and Ni2+ significantly enhances the degradation of bisphenol A by increasing the generation of reactive species.
APPLIED CATALYSIS B-ENVIRONMENT AND ENERGY
(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.