Article
Engineering, Environmental
Chenyan Hu, Cun Xiong, Yi-Li Lin, Yeye Zhu, Qiangbing Wang, Lin Xu, Dandan Huang
Summary: The degradation kinetic model and pathways of a UV filter, PBSA, during UV/chlorination were investigated. The efficient degradation of PBSA was observed under UV/chlorination conditions and followed pseudo-first order kinetics. The contribution of radicals and the effect of different factors on PBSA degradation were determined. The study also proposed transformation pathways and evaluated the formation of chlorinated disinfection by-products. Overall, the study provides insights into the efficiency, mechanism, and safety of removing PBSA using UV/chlorination.
JOURNAL OF HAZARDOUS MATERIALS
(2022)
Article
Engineering, Environmental
Yulong Yang, Zhanghua Liu, Huiming Zheng, Shicui Zhu, Kejia Zhang, Xueyan Li, Xiaoyan Ma, Andrea M. Dietrich
Summary: Sucralose (SUC) as a globally important artificial sweetener, demonstrates persistent contamination in urban water cycles, exhibiting resistance to conventional treatment methods.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Engineering, Environmental
He Zhao, Ching-Hua Huang, Chen Zhong, Penghui Du, Peizhe Sun
Summary: This study investigated the formation of THMs from HBQs during chlorine-only and UV/chlorine processes. The results showed that UV and hydroxylation played important roles in promoting THMs formation. Additionally, the hydroxylation reaction and the formation of CHCl3 increased at higher pH.
FRONTIERS OF ENVIRONMENTAL SCIENCE & ENGINEERING
(2022)
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
Yuanxin Zhai, Dan Bai, Heyun Yang, Xiaoliang Li, Daiwen Zhu, Xin Cao, Hao Ma, Xiaolin Li, Xing Zheng
Summary: The E. coli whole-cell microarray assay was used to evaluate the impact of sucralose on 110 selected genes under different exposure concentrations. Sucralose at different concentrations induced varying levels of protein response and DNA damage in the study. Additionally, exposure to sucralose caused changes in gene expression, with DNA damage showing a concentration-dependent effect.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2021)
Article
Engineering, Environmental
Yuyin Tang, Cheng-Shiuan Lee, Harold Walker, Christopher Gobler, Onur Apul, Arjun K. Venkatesan, Xinwei Mao
Summary: This study investigated the impact of residual H2O2 on the removal of AOP byproducts by two types of GAC, revealing that the presence of byproducts significantly inhibited the decomposition of H2O2 on Centaur. In multi-component systems, both GACs showed decreased byproduct removal kinetics and capacity due to competition.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Chemistry, Physical
Meisam Ashrafivala, Seyed Borhan Mousavi, Saeed Zeinali Heris, Mohammad Heidari, Mousa Mohammadpourfard, Hassan Aslani
Summary: Wastewater recycling and reuse are particularly important in countries with water scarcity issues, and disinfection is a crucial step in achieving this goal. This research investigates the use of the advanced oxidation process combining UV and H2O2 for fecal coliform inactivation in industrial effluent. Optimal disinfection conditions were determined based on parameters such as pH, H2O2 concentration, and contact time. The results show that acidic conditions, increased H2O2 concentration, and longer contact time contribute to higher inactivation rates. The combined UV/H2O2 process is more effective than using UV or H2O2 alone and can meet irrigation standards.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Engineering, Environmental
Giulio Farinelli, Marco Coha, Davide Vione, Marco Minella, Alberto Tiraferri
Summary: Peracetic acid is widely used as a disinfectant in water treatment due to its effectiveness and ease of use. However, its chemical behavior is still debated. This study found that peracetic acid itself can contribute to the formation of potentially carcinogenic compounds, in addition to its ability to form halogenated byproducts in the presence of organic matter and halides.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Environmental
Yongyi Wang, Ben Ma, Chun He, Dehua Xia, Ran Yin
Summary: This study reveals the inhibitory effect of nitrate on the Far-UVC disinfection of water, due to its strong light-shielding effect. Moreover, nitrate leads to the formation of genotoxic nitrogenous byproducts. The findings provide valuable insights for the use of nitrate in Far-UVC water disinfection.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Yunsi Liu, Hang Liu, Jean-Philippe Croue, Chao Liu
Summary: Previous studies showed that cupric oxide (CuO) does not enhance the formation of certain disinfection byproducts (DBPs) during chlorination, but it can accelerate the reaction rates of chlorine (HOCl) with certain substances through an oxidation pathway. These findings provide novel insights into the formation pathway of DBPs in copper-containing distribution systems.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Review
Chemistry, Analytical
Caley B. Craven, Yanan Tang, Kristin Carroll, Lirong An, Bin Chen, Xing-Fang Li
Summary: Halogenated nitrogenous disinfection byproducts (X-NDBPs) are unregulated but toxicologically relevant DBPs that can be formed through the substitution of halogens to carbon or nitrogen. Stable X-NDBPs are more toxic than regulated DBPs and play a significant role in the cytotoxicity of disinfected water. Development of simplified sampling techniques, identification of reactive nitrogenous organics in source water, and identification of missing X-NDBPs in disinfected water are necessary for future research.
TRAC-TRENDS IN ANALYTICAL CHEMISTRY
(2022)
Article
Engineering, Environmental
Zahra Amiri, Gholamreza Moussavi, Samira Mohammadi, Stefanos Giannakis
Summary: The study demonstrated the effectiveness of VUV-UVC/PMS process in treating river water by achieving efficient NOM mineralization and bacterial disinfection, with accelerated TOC removal and disinfection rate by adding PMS. Aeration played a crucial role in NOM mineralization, while sulfate enhanced TOC removal in the process.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Engineering, Environmental
Devon Manley Bulman, Reid P. Milstead, Christina K. Remucal
Summary: Bromide in water can lead to increased formation of disinfection byproducts during chlorine photolysis, which is an advanced oxidation process. The mechanisms and potential formation of disinfection byproducts (DBPs) under these conditions are not well understood. Our study investigated the generation of reactive oxidants and DBP formation during dark conditions, chlorine photolysis, and radical-quenched chlorine photolysis, with varying chlorine and bromide concentrations. We found that the formation of targeted and novel DBPs during chlorine photolysis may be limited in waters with elevated bromide.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Review
Environmental Sciences
Feilong Dong, Qiufeng Lin, Cong Li, Guilin He, Yang Deng
Summary: This article reviews the impact of pre-oxidation on the formation of DBPs during chlor(am)ination, discussing the application of various pre-oxidation technologies and their effects on algal cells and AOM. Pre-oxidation can reduce the stability of algal cells, promote aggregation, and degrade AOM to reduce the potential for DBP formation during subsequent chlor(am)ination. The article also evaluates the applicability of different pre-oxidation processes and identifies future research needs.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Engineering, Environmental
Yun Kyung Lee, Ha-Young Yoo, Kyung-Seok Ko, Wei He, Tanju Karanfil, Jin Hur
Summary: This study tracks the spectroscopic signatures of MPs in sandy subsurface systems and explores their potential to form disinfection byproducts (DBPs). The addition of MPs increases the amount of dissolved organic matter (DOM) during infiltration, with UV-irradiated MPs having a more pronounced effect. Two fluorescent components, C1 and C2, are identified, with C1 being more predominant. Environmental interferences such as biodegradation and mineral adsorption do not fully explain the spectroscopic signatures of MP-DOM in the infiltration process.
Article
Engineering, Environmental
Wei Li, Hongguang Guo, Chengjin Wang, Yongli Zhang, Xin Cheng, Jingquan Wang, Bo Yang, Erdeng Du
CHEMICAL ENGINEERING JOURNAL
(2020)
Article
Engineering, Environmental
Chengjin Wang, Erik Rosenfeldt, Yi Li, Ron Hofmann
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2020)
Article
Engineering, Environmental
Abdallatif Satti Abdalrhman, Chengjin Wang, Zuo Tong How, Mohamed Gamal El-Din
Summary: The study found that the ideal condition for degrading CHA using the UV/Chlorine process is to continuously add chlorine at a constant rate to reduce chlorine consumption and minimize the radical scavenging effect, resulting in a higher removal rate.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Review
Engineering, Environmental
Husein Almuhtaram, Chengjin Wang, Ron Hofmann
Summary: Many UV experiments are conducted without accurate fluence measurement, which can affect interpretation of results. Studies show inconsistencies in the direct photolysis of microcystin-LR, with most not following proper fluence calculation procedures.
ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS
(2021)
Article
Engineering, Environmental
Nathan Moore, Shelir Ebrahimi, Yanping Zhu, Chengjin Wang, Ron Hofmann, Susan Andrews
Summary: This study compared three commonly used quenching agents for dechlorinating water samples prior to disinfection byproduct (DBP) analysis. Results showed that ascorbic acid and sodium sulfite were effective quenching agents, while ammonium chloride led to errors for multiple DBPs.
Article
Biochemical Research Methods
Abdallatif Satti Abdalrhman, Chengjin Wang, Angelica Manalac, Madrigal Weersink, Abdul-Amir Yassine, Vaughn Betz, Benoit Barbeau, Lothar Lilge, Ron Hofmann
Summary: The study simulated light transport in different FFRs to evaluate UV at 254 nm for deactivating SARS-CoV-2, finding varying efficacy across different models, with discrepancies between model predictions and experimental results possibly due to virus aggregation or soiling affecting UV exposure, as well as the Monte Carlo simulations not considering near-field scattering effects.
JOURNAL OF BIOPHOTONICS
(2021)
Article
Engineering, Environmental
Bo Yang, Chengjin Wang, Xin Cheng, Yongli Zhang, Wei Li, Jingquan Wang, Zixin Tian, Wenhai Chu, Gregory Korshin, Hongguang Guo
Summary: The study investigated the impact of DOM/MP binding on the oxidative degradation of micro-pollutants in water, revealing that the binding of DOM affects the removal efficiency of micro-pollutants and varies across different oxidation processes. Results showed that free TET is generally preferentially oxidized over bound TET in various treatments.
Correction
Engineering, Environmental
Chengjin Wang, Erik Rosenfeldt, Yi Li, Ron Hofmann
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Environmental
Kirsten Yeung, Nathan Moore, Jianxian Sun, Lizbeth Taylor-Edmonds, Susan Andrews, Ronald Hofmann, Hui Peng
Summary: We propose a new acellular analytical strategy, the 'Thiol Reactome', toidentify thiol-reactive DBPs. This method was applied to chemically disinfected/oxidized waters, and 181 tentative DBP-GSH reaction products were detected. Nitrogenous-DBPs (11) and unsaturated carbonyls (4) were the predominant compound classes.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Xin Cheng, Jingquan Wang, Bo Yang, Chengjin Wang, Wenhai Chu, Hongguang Guo
Summary: The interaction of antibiotics with metal ions in aquatic environments can form complexes, which can affect the migration, transformation, and reactivity of residual antibiotics. This study demonstrates the photolysis of Fe(III) by UV irradiation at pH 3.5 for the degradation of the antibiotic compound tetracycline (TET). The binding sites for the complexation between Fe(III) and TET were determined, and the complexation stoichiometry was analyzed.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Review
Engineering, Environmental
E. Mackey, R. Hofmann, A. Festger, C. Vanyo, N. Moore, T. Chen, C. Wang, L. Taylor-Edmonds, S. A. Andrews
Summary: This paper presents the findings of a recent study conducted for the Water Research Foundation and the State of California, offering guidance on UV-chlorine advanced oxidation for potable water reuse. The study discusses the fundamentals of UV-chlorine advanced oxidation and shares lessons learned from early adopters of this technology. Key highlights include the significant impact of ammonia and chloramines on UV-chlorine treatment, challenges in predicting UV-chlorine performance due to complex photochemistry, and the importance of monitoring potential byproducts and transformation products for potable water reuse.
Article
Engineering, Environmental
Tianyi Chen, Domenica Cevallos, Alonso Hurtado, Erin Mackey, Chengjin Wang, Ron Hofmann
Summary: Peracetic acid (PAA) can be used for pre-oxidation and mussel control in drinking water treatment. The reaction mechanisms between PAA and chlorine have not been fully studied, but it is found that the molar stoichiometric ratio of PAA to free chlorine is approximately 2:1, and the reaction rate coefficients vary with pH. A kinetic model was developed based on these values to predict the chlorine demand by PAA.
Article
Engineering, Environmental
Nathan Moore, Chengjin Wang, Susan Andrews, Ron Hofmann
Summary: UV/Cl and UV/H2O2 are compared in terms of their efficiency in the degradation of contaminants in water, with the hypothesis that UV/Cl becomes more competitive as TOC concentration increases at neutral-to-high pH. The results indicate that UV/Cl shows less decrease in reaction rate coefficients for certain contaminants compared to UV/H2O2 as TOC concentration increases, suggesting that UV/Cl may be more energy-efficient in a wider range of treatment scenarios than previously thought.
Article
Environmental Sciences
Yanping Zhu, Chengjin Wang, Susan Andrews, Ron Hofmann
Summary: This study investigated the impact of UV/chlorine on the formation of disinfection byproducts (DBP) in water treatment. The results showed that UV/chlorine either decreased the formation potential of most active DBP precursors or had no significant impact. However, for certain poor DBP precursors, UV/chlorine oxidation activated them, leading to an increase in DBP formation.
Article
Environmental Sciences
Tianyi Chen, Chengjin Wang, Susan Andrews, Ron Hofmann
Summary: This study found that the relative competitiveness of UV/chlorine and UV/H2O2 advanced oxidation processes varies depending on path length. Chlorine performs better than H2O2 at longer path lengths, especially at lower pH values, smaller oxidant doses, and in natural water matrices.
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.