Article
Engineering, Environmental
Yang Guo, Qian Yang, Jie Xu, Xueling Bai, Qihuan Han, Jie Nie, Luo Zhang, Hongtao Li, Haixiang Gao, WenFeng Zhou, Jing Li
Summary: The study utilized a novel analytical method to monitor the volatile byproducts of organic chloramines during chlorination and identified (CH3)2NCl and (C2H5)2NCl as important organic chloramines, which may promote the formation of other disinfection byproducts.
Article
Environmental Sciences
Md. Tareq Aziz, Caroline O. Granger, John L. Ferry, Susan D. Richardson
Summary: Harmful algal blooms (HABs) are increasing worldwide, and they can directly release toxins into freshwater sources. This study investigated the impact of algae on the formation of disinfection by-products (DBPs). The results showed that the presence of HAB-dominated microbial communities led to significant increases in more toxic nitrogen-containing DBPs. Chlorination with chloramine resulted in lower total DBP levels compared to chlorination with chlorine, but produced a greater number of brominated, iodinated, and mixed halogenated DBPs.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Hongyan Zhai, Shengzi Cheng, Liangyu Zhang, Wenjing Luo, Yanan Zhou
Summary: This study investigates the formation of disinfection byproducts (DBPs) during chlorination and chloramination of algal organic matter (AOM) from four algal species. It identifies the factors that affect the types and yields of DBPs under different conditions. The results show that the concentrations of disinfectant, pH, and bromide can all influence the formation of DBPs during chlorination and chloramination processes.
Article
Engineering, Environmental
Da Sheng, Lingjun Bu, Shumin Zhu, Lin Deng, Zhou Shi, Shiqing Zhou
Summary: This study presents a two-step chlorination strategy to convert organic chloramines to monochloramine, thereby reducing the formation of organic chloramines and inhibiting the formation of nitrogenous disinfection byproducts (N-DBPs). The results show that the two-step chlorination can decrease the formation of organic chloramines by nearly 50% compared to traditional one-step chlorination. Furthermore, the two-step chlorination not only blocks the pathway of organic chloramine decomposition to nitriles, but also converts organic chloramines to monochloramine. During the two-step chlorination of algal organic matter, the proportion of organic chloramine transfer decreases by 6.5% and the proportion of monochloramine transfer increases by 17.0%. The formation of N-DBPs, especially haloacetonitriles (HANs), significantly decreases as organic nitrogen is converted to inorganic nitrogen (monochloramine) in the two-step chlorination. This work further clarifies the process from algal organic matter to N-DBPs, which can enhance our understanding of algae-derived organic chloramines removal and DBPs control.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Environmental Sciences
Chenyang Zhang, Paolo Roccaro, Mingquan Yan, Gregory Korshin
Summary: This study investigated the effects of temperature and chlorine dose on the formation of toxic disinfection by-products and examined the activation energies of their degradation reactions. The results provide insights into controlling the formation of unstable DBPs and optimizing drinking water treatment.
Article
Environmental Sciences
Shu He, Nanqi Ren
Summary: The PM/BS process is an efficient oxidation process for degrading micropollutants. However, when reacting with natural organic matter (NOM) in water, it can impact the formation of disinfection-by-products (DBPs) during chlorination. This study found that PM/BS pre-oxidation of NOM decreased the formation of TCM but increased the production of highly toxic N-DBPs, thus increasing the risk of water quality.
Article
Engineering, Environmental
Nicholas J. P. Wawryk, Guang Huang, Caley Craven, Junlang Qiu, Lindsay K. Jmaiff Blackstock, Xing-Fang Li
Summary: The study found that APM and sweeteners containing APM can react with residual chlorine in tap water, resulting in the formation of eight new disinfection byproducts (DBPs) and 2,6-dichloro-1,4-benzoquinone (DCBQ). These DBPs were also detected in tea containing APM. These results suggest that APM sweetened beverages could be a potential source of unintended exposure to emerging DBPs.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Shaoyang Hu, Han Yeong Kaw, Lizhong Zhu, Wei Wang
Summary: This study successfully identified a new group of nitrogenous aromatic halogenated disinfection byproducts, halophenylacetamides (HPAcAms), in laboratory experiments and realistic drinking water for the first time. The study investigated the formation mechanism, occurrence frequencies, and concentrations of HPAcAms in authentic drinking water, and developed a quantitative structure-activity relationship (QSAR) model based on cytotoxicity data. The results showed that HPAcAms could form from phenylalanine during chlorination and their yields were influenced by various factors. Multiple HPAcAms were detected in authentic drinking water samples and showed higher cytotoxicity compared to the most abundant aliphatic haloacetamide DBP.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Environmental Sciences
Qiuhong Liang, Jianfa Gao, Danfen Guo, Jingxiong Huang, Junmin Zhang, Juying Li, Bo Yang, Baiyang Chen, Qianyuan Wu, Mengting Yang
Summary: This study investigated the formation characteristics of halogenated DBPs from tannic acid biodegradation products during chloramination, identifying fifty-nine polar emerging DBPs and proposing their formation pathways. The research found that more polar emerging DBPs were formed at the early biodegradation stage, while the relative formation level of brominated species in overall halogenated polar emerging DBPs decreased significantly later during chloramination. The calculated toxicity drivers among the 21 aliphatic DBPs were haloacetonitriles, although they contribute mildly to the total concentration.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Luan de Souza Leite, Danilo Vitorino dos Santos, Cristina Filomena Pereira Rosa Paschoalato, Tom Bond, Luiz Antonio Daniel
Summary: Eutrophication in water reservoirs leads to the release of algal organic matter (AOM), which serves as an important precursor for disinfection by-products (DBPs) during water treatment. This study investigates the DBP formation from chlor(am)ination of AOM derived from the microalgae Chlorella sorokiniana, which is expected to become more prevalent in algal blooms due to climate change. The results show that Chlorella sorokiniana AOM exhibits higher DBP formation compared to previously studied algae species.
Article
Environmental Sciences
Chen-Yan Hu, Ji-Chen Zhang, Yi-Li Lin, Si-Cheng Ren, Ye-Ye Zhu, Cun Xiong, Qiang-Bing Wang
Summary: In this study, the factors affecting the degradation kinetics of prometryn chlorination were investigated, including solution pH, bromide and ammonium concentrations, and temperature. The results showed that the presence of bromide and the increase of temperature accelerated the degradation rate of prometryn during chlorination, while the pH significantly affected the formation and distribution of disinfection by-products (DBPs).
Article
Environmental Sciences
Zhao-Xi Ye, Kai-Li Shao, Huang Huang, Xin Yang
Summary: The study indicates that tetracycline antibiotics form DBPs including DCAcAm during chlorination and chloramination, with DCAcAm being a main contributor to the yields and cytotoxicity of the measured DBPs.
Article
Engineering, Environmental
Yuru Wang, Yingying Xiang, Mauricius Marques dos Santos, Gaoling Wei, Bin Jiang, Shane Snyder, Chii Shang, Jean-Philippe Croue
Summary: UV/chlorine process is effective in eliminating pathogens and refractory micro-pollutants in the reclamation of municipal secondary effluent. However, the high organic nitrogen content of effluent organic matter (EfOM) can lead to the formation of nitrogenous disinfection byproducts (N-DBPs) of health concern. This study tracked the molecular-level changes of hydrophobic (HPO) and transphilic (TPI) EfOM fractions during UV/chlorine treatment and observed the formation of diverse and intense N-DBPs. Toxicity bioassays showed that these N-DBPs can induce oxidative stress-induced DNA damage. The study highlights the importance of evaluating EfOM characteristics and transformation for the practical application of the UV/chlorine process.
Article
Environmental Sciences
Yuwei Wu, Da Sheng, Yangtao Wu, Julong Sun, Lingjun Bu, Shumin Zhu, Shiqing Zhou
Summary: The study found that more nitrogen-containing compounds were generated after UV-LEDs/chlorine process, leading to a larger formation of N-DBPs. Compounds such as lignin, proteins, and amino sugars tend to be oxidized in the UV-LEDs/chlorine process. Higher O/C and weighted average double bond equivalence (DBEw) compounds were easier to form N-DBPs, including dichloroacetonitrile and trichloronitromethane.
SCIENCE OF THE TOTAL ENVIRONMENT
(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.
Review
Environmental Sciences
Rong Xiao, Tian Ou, Shunke Ding, Chao Fang, Zuxin Xu, Wenhai Chu
Summary: This article provides an overview of disinfection by-products (DBPs) in the urban water cycle, discussing their characteristics, occurrence, and fate in different aqueous environments. The review highlights the influence of internal and external factors on DBP fate and removal. The identification and monitoring of DBPs, as well as predictive modeling, are necessary for assessing and mitigating their potential impacts on ecological safety and human health. Future research should also focus on the occurrence and fate of DBPs in the air and terrestrial ecosystems.
CRITICAL REVIEWS IN ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2023)
Review
Environmental Sciences
Ziyan Zhang, Kaiming Fan, Yanling Liu, Shengji Xia
Summary: This review systematically summarizes the research progress of polyester and polyester-amide nanofiltration membranes, including the synthesis strategies, property tuning mechanisms, and application advantages. Current challenges and future development directions are also proposed. This review provides guidance for designing high-performance polyester and polyester-amide membranes, thereby further enhancing the efficacy of nanofiltration.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Renjie Pan, Yi-Li Lin, Tian -Yang Zhang, Xiu-Li Wei, Zheng-Yu Dong, Chen-Yan Hu, Yu-Lin Tang, Bin Xu
Summary: Combining pre-oxidation with activated carbon adsorption is an effective method to remove iodine from water source and eliminate the formation of I-THMs. Chlorine is the most suitable pre-oxidant for obtaining active iodine species. The adsorption of active iodine species on activated carbon follows the pseudo-second-order kinetic model, indicating chemical adsorption as the dominant mechanism. The average pore size of activated carbons is strongly correlated with the adsorption capacity. The combined process can effectively remove HOI/I2 and reduce the formation of I-THMs in the disinfection process.
Article
Engineering, Environmental
Chao Fang, Xinmiao Luan, Feiyang Ao, Xingyu Wang, Shunke Ding, Zhenqi Du, Shushen Liu, Ruibao Jia, Wenhai Chu
Summary: In this study, it was discovered that the level of TOX in chlorinated waters had been significantly underestimated under common analytical conditions. The addition of quenching agent sodium thiosulfate resulted in a two-phase decomposition pattern of total organic chlorine and total organic bromine, indicating the important toxicological significance of the DBPs responsible for TOX decomposition. Nontarget analysis using high-resolution mass spectrometry revealed the molecular formulas for the decomposed TOX, and it was found that the level of unknown TOX in chlorinated waters was considerably higher than previously thought.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Jingquan Wang, Min Zheng, Erdeng Du, Wenhai Chu, Hongguang Guo
Summary: Ultraviolet (UV)/chlor(am)ine processes are emerging AOPs for water decontamination. This study demonstrates the potential of UV/NaDCC as a new AOP, which can produce more hydroxyl radicals and reactive chlorine species and achieve higher oxidation efficiency than conventional AOPs.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Chemical
Xiaoping Wang, Yanling Liu, Kaiming Fan, Peng Cheng, Shengji Xia
Summary: Introducing nanomaterials into the polyamide layer of TFC membranes enhances permeability without sacrificing selectivity. In this study, novel TFN membranes were prepared by varying the deposition density of hierarchical flower-like structured MoS2. These membranes showed increased effective filtration area and reduced mass transfer resistance. They also exhibited looser polyamide layers with higher hydrophilicity and negative surface charges compared to control TFC membranes. The optimal TFN membrane achieved excellent separation performance and structure stability, making it suitable for water/wastewater treatment.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Review
Chemistry, Multidisciplinary
Chao Wu, Lei Xia, Shengji Xia, Bart van der Bruggen, Yan Zhao
Summary: Membrane technology has great potential in liquid waste treatment and resource recovery. However, the non-adjustable pore size of traditional membranes limits their selectivity for target ions. Covalent organic frameworks (COFs) have emerged as a promising candidate for advanced ion separation membranes due to their low density, large surface area, tunable channel structure, and tailored functionality. This review analyzes and summarizes the progress in understanding ion capture mechanisms, preparation processes, and applications of COF-based membranes, providing promising approaches for the design, preparation, and application of COF-based membranes in ion selectivity for recovery of ionic resources.
Review
Engineering, Environmental
Airan Hu, Yanling Liu, Junfeng Zheng, Xiaomao Wang, Shengji Xia, Bart Van der Bruggen
Summary: The utilization of salt additives in interfacial polymerization for thin film composite membranes has not been systematically summarized. This review provides an overview of various salt additives used to tailor membrane properties and performance. The effects and mechanisms of organic and inorganic salt additives on membrane formation and structure are discussed, and their potential for improving membrane performance is highlighted.
Article
Thermodynamics
Y. L. Lin, S. T. Chen, N. Y. Zheng, H. C. Wang
Summary: In this study, ultrasonication coupled with low dosage of H2O2 was used to dewater and reduce activated sludge. The remaining sludge after ultrasonication was converted into biochar through torrefaction. Bench-scale tests showed that high reduction in sludge volume and mass (>50%) and high-carbohydrate and -protein content in the supernatant were achieved. The produced biochar exhibited high heating value, energy return on investment, and lower greenhouse gas emissions compared to bituminous coal. Pilot-scale tests confirmed the feasibility of the method, with significantly lower cost compared to conventional methods.
Article
Engineering, Environmental
Peng Cheng, Tongren Zhu, Xiaoping Wang, Kaiming Fan, Yanling Liu, Xiao-mao Wang, Shengji Xia
Summary: The confined interfacial polymerization (CIP) method was used to synthesize polyamide (PA)-modified nanofiltration (NF) membranes with metal-organic framework (MOF) nanosheets, achieving a transition from 2D MOF membranes to polyamide NF membranes. The prepared membrane exhibited high rejection capacity and water permeance, outperforming both pristine MOF membranes and conventional PA membranes containing MOF nanosheets. The PA-modified MOF membrane also showed excellent stability and antifouling ability, providing a new strategy for efficient MOF-based NF membranes in water treatment applications.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Yan Liu, Jianfa Gao, Qingyao Zhu, Xi Zhou, Wenhai Chu, Jingxiong Huang, Changkun Liu, Bo Yang, Mengting Yang
Summary: This study reports the effective degradation of halogenated aromatic disinfection byproducts (DBPs) by ZVI/Cu and establishes a novel mechanism-based quantitative structure-activity relationship model to predict degradation rate constants. The study found that ZVI/Cu can effectively degrade not only aliphatic DBPs but also new emerging aromatic DBPs formed in chlorinated and chloraminated drinking water. A quantitative structure-activity relationship model was developed to predict the degradation rate constants of other aromatic DBPs, and optimized descriptors were identified.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Kaiming Fan, Zhaohuan Mai, Yanling Liu, Xiaoping Wang, Yidi Huang, Peng Cheng, Shengji Xia, Hideto Matsuyama
Summary: Polyester (PE) membranes have gained significant attention due to their remarkable chlorine resistance and antifouling ability. In this study, three relatively dense polyester membranes were successfully prepared using erythritol, xylitol, and isomalt as monomers, showing satisfying separation capacities and potential for applications in drinking water treatment. The study also revealed the influence of molecular size, hydroxyl density, and activity of polyols on the physicochemical properties and separation performance of PE membranes. The PE membranes outperformed commercial NF270 and lab-made polyamide membranes in terms of chlorine resistance and antifouling performance. This study provides valuable insights for the development of high-performance PE membranes through rational monomer selection and performance optimization.
ACS ES&T ENGINEERING
(2023)
Article
Engineering, Environmental
Yanling Liu, Kunpeng Wang, Peng Cheng, Kaiming Fan, Yawei Gao, Shengji Xia, Xiao-mao Wang, Yuefeng F. Xie, Xia Huang
Summary: This study found that a simple hexane treatment after the interfacial polymerization reaction can significantly alter the properties of polyamide (PA) thin-film composite (TFC) nanofiltration membranes and enhance their separation performance in drinking water treatment. The treatment time of hexane has a significant impact on the membrane properties, with 5 seconds of hexane rinsing leading to a thinner active layer and more than 60% improvement in water permeance. Hexane soaking for a longer time can effectively reduce the membrane surface negative charge density by approximately 70%. These property variations make the hexane-treated membranes more competitive than conventional PA membranes for hardness removal in drinking water treatment. Furthermore, the rejection performance for organic micropollutants can be maintained after hexane treatments of varying durations due to the unchanged membrane pore sizes.
ACS ES&T ENGINEERING
(2023)
Article
Engineering, Environmental
Chen-Yan Hu, Dan-Dan Huang, Yi-Li Lin, Qiang-Bing Wang, Ling Xu, Zi-Yi Dong, Yi-Hui Wu, Sheng-Jie Ji
Summary: This study investigates the degradation kinetics and formation of disinfection by-products (DBPs) of metribuzin, a commonly used herbicide, in the UV/chlorine process. Factors such as chlorine dosage, pH, and the presence of chloride and natural organic matter in water were evaluated. The results showed that UV/chlorination had a higher degradation rate constant compared to UV-alone or chlorine-alone processes, and the degradation was influenced by chlorine dosage, pH, chloride, and natural organic matter.
ENVIRONMENTAL SCIENCE-WATER RESEARCH & TECHNOLOGY
(2023)
Article
Environmental Sciences
Yi-Li Lin, Nai-Yun Zheng, Yu-Jhen Hsu
Summary: This study investigates the in-situ surface grafting modification of the NF90 nanofiltration membrane. The modified membrane shows improved permeate flux, salt rejection, and PPCPs removal. Fouling with sodium alginate and humic acid further enhances the rejection of salt and PPCPs due to the additional steric barrier layer provided by the fouling materials.
ENVIRONMENTAL RESEARCH
(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.
