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| 1 | Control of aliphatic halogenated DBP precursors with multiple drinking water treatment processes: Formation potential and integrated toxicity显示文摘The comprehensive control efficiency for the formation potentials(FPs) of a range of regulated and unregulated halogenated disinfection by-products(DBPs)(including carbonaceous DBPs(C-DBPs), nitrogenous DBPs(N-DBPs), and iodinated DBPs(I-DBPs)) with the multiple drinking water treatment processes, including pre-ozonation, conventional treatment(coagulation–sedimentation, pre-sand filtration), ozone-biological activated carbon(O_3-BAC) advanced treatment, and post-sand filtration, was investigated. The potential toxic risks of DBPs by combing their FPs and toxicity values were also evaluated.The results showed that the multiple drinking water treatment processes had superior performance in removing organic/inorganic precursors and reducing the formation of a range of halogenated DBPs. Therein, ozonation significantly removed bromide and iodide,and thus reduced the formation of brominated and iodinated DBPs. The removal of organic carbon and nitrogen precursors by the conventional treatment processes was substantially improved by O_3-BAC advanced treatment, and thus prevented the formation of chlorinated C-DBPs and N-DBPs. However, BAC filtration leads to the increased formation of brominated C-DBPs and N-DBPs due to the increase of bromide/DOC and bromide/DON.After the whole multiple treatment processes, the rank order for integrated toxic risk values caused by these halogenated DBPs was haloacetonitriles(HANs)》haloacetamides(HAMs) >haloacetic acids(HAAs) > trihalomethanes(THMs) > halonitromethanes(HNMs) 》I-DBPs(I-HAMs and I-THMs). I-DBPs failed to cause high integrated toxic risk because of their very low FPs. The significant higher integrated toxic risk value caused by HANs than other halogenated DBPs cannot be ignored. | Yimeng Zhang Wenhai Chu Dechang Yao Daqiang Yin | 2017 | Journal of Environmental Sciences2017，29，8： | 15 |
| 2 | Carbonaceous and nitrogenous disinfection by-product formation in the surface and ground water treatment plants using Yellow River as water source显示文摘This work investigated the formation of carbonaceous and nitrogenous disinfection by-products (C-DBPs, N-DBPs) upon chlorination of water samples collected from a surface water and a ground water treatment plant (SWTP and GWTP) where the conventional treatment processes, i.e., coagulation, sedimentation, and filtration were employed. Twenty DBPs, including four trihalomethanes, nine haloacetic acids, seven N-DBPs (dichloroacetamide, trichloroacetamide, dichloroacetonitrile, trichloroacetonitrile, bromochloroace-tonitrile, dibromoacetonitrile and trichloronitromethane), and eight volatile chlorinated compounds (dichloromethane (DCM), 1,2-dichloroethane, tetrachloroethylene, chlorobenzene, 1,2-dichlorobenzene, 1,4-dichlorobenzene, 1,2,3-trichlorobenzene and 1,2,4-trichlorobenzene) were detected in the two WTPs. The concentrations of these contaminants were all below their corresponding maximum contamination levels (MCLs) regulated by the Standards for Drinking Water Quality of China (GB5749-2006) except for DCM (17.1 μg/L detected vs. 20 μg/L MCL). The SWTP had much higher concentrations of DBPs detected in the treated water as well as the DBP formation potentials tested in the filtered water than the GWTP, probably because more precursors (e.g., dissolved organic carbon, dissolved organic nitrogen) were present in the water source of the SWTP. | Yukun Hou Wenhai Chu Meng Ma | 2012 | Journal of Environmental Sciences2012，24，7： | 7 |
| 3 | Photochemical degradation of typical halogenated herbicide 2,4-D in drinking water with UV/H_(2)O_(2)/micro-aeration显示文摘UV/H2O2/micro-aeration is a newly developed process based on UV/H2O2. Halogenated pesticide 2,4-dichlorophenoxyacetic acid (2,4-D) photochemical degradation in aqueous solution was studied under various solution conditions. The UV intensity,initial 2,4-D concentrations and solution temperature varied from 183.6 to 1048.7 μW·cm-2,from 59.2 to 300.0 μg·L-1 and from 15 to 30℃,respectively. The concentration of hydrogen peroxide (H2O2) and pH ranged from 0 to 50 mg·L-1 and 5 to 9,and different water quality solutions (tap water,distilled water and deionized water) were examined in this study. With initial concentration of about 100 μg·L-1,more than 95.6% of 2,4-D can be removed in 90 min at intensity of UV radiation of 843.9 μW·cm-2,H2O2 dosage of 20 mg·L-1,pH 7 and room temperature. The removal efficiency of 2,4-D by UV/H2O2/micro-aeration process is better than UV/H2O2 process. The photodecomposition of 2,4-D in aqueous solution follows pseudo-first-order kinetics. 2,4-D is greatly affected by UV irradation intensity,H2O2 dosage,initial 2,4-D concentration and water quality solutions,but it appears to be slightly influenced by pH and temperature. There is a linear relationship between rate constant k and UV intensity and initial H2O2 concentration,which indicates that higher removal capacity can be achieved by the improvement of these factors. Finally,a preliminary cost analysis reveals that UV/H2O2/micro-aeration process is more cost-effective than the UV/H2O2 process in the removal of 2,4-D from drinking water. | CHU WenHai GAO NaiYun LI Chong CUI Jing | 2009 | Science China Chemistry2009，52，12： | 5 |
| 4 | The performance and mechanism of iron-mediated chemical oxidation:Advances in hydrogen peroxide,persulfate and percarbonate oxidation显示文摘Many studies have successfully built iron-mediatedmaterials to activate or catalyze Fentonlike reactions,with applications in water and wastewater treatment being investigated.However,the developed materials are rarely compared with each other regarding their performance of organic contaminant removal.In this review,the recent advances of Fentonlike processes in homogeneous and heterogeneous ways are summarized,especially the performance and mechanism of activators including ferrous iron,zero valent iron,iron oxides,iron-loaded carbon,zeolite,and metal organic framework materials.Also,this work mainly compares three O-O bond containing oxidants including hydrogen dioxide,persulfate,and percarbonate,which are environmental-friendly oxidants and feasible for in-situ chemical oxidation.The influence of reaction conditions,catalyst properties and benefits are analyzed and compared.In addition,the challenges and strategies of these oxidants in applications and the major mechanisms of the oxidation process have been discussed.This work can help understand the mechanistic insights of variable Fenton-like reactions,the role of emerging iron-based materials,and provide guidance for choosing appropriate technologies when facing real-world water and wastewater applications. | Mengqi Han Hui Wang Wei Jin Wenhai Chu Zuxin Xu | 2023 | Journal of Environmental Sciences2023，，6： | 2 |
| 5 | Removal of phenol by powdered activated carbon adsorption显示文摘 | Yan MA Naiyun GAO Wenhai CHU Cong LI | 2013 | Frontiers of Environmental Science & Engineering2013，7，2： | 2 |
| 6 | Evaluation of N-acetylcysteine and glutathione as quenching agents for the analysis of halogenated disinfection by-products显示文摘Disinfection by-products(DBPs), formed from the reactions of disinfectants with natural organic matter and halides in drinking water, were considered to be cytotoxic and genotoxic, and might trigger various cancers. The relatively low concentration of DBPs in finished water(low μg/L or even ng/L levels) and the interference from water matrix inhibited in situ determination of DBPs. Moreover, the further formation and degradation of DBPs by disinfectants during the holding time(several hours to several days) from sample collection to analysis could adversely affect the determination of DBPs. To obtain accurate, precise and reliable data of DBP occurrence and formation, robust and reliable sample preservation is indispensable. However, the commonly used quenching agents(e.g., sodium sulfite, sodium thiosulfate, and ascorbic acid) for sample preservation can decompose reactive DBPs by reductive dehalogenation. This study evaluated the performance of N-acetylcysteine(NAC) and glutathione(GSH) as quenching agents for the analysis of halogenated DBPs by investigating the stoichiometry of the disinfectant-quenching agent reaction, the formation of DBPs during chlor(am)ination of NAC or GSH, and the effects of NAC or GSH on the stability of 18 individual DBPs and total organic halogen(TOX). Based on the results of this study, NAC and GSH were considered to be ideal quenching agents for the analysis of most DBPs and TOX, except halonitromethanes. | Shunke Ding Menglin Wu Rong Xiao Chao Fang Qi Wang Bin Xu Wenhai Chu | 2022 | Journal of Environmental Sciences2022，34，7： | 2 |
| 7 | Identification of key precursors contributing to the formation of CX_(3)R-type disinfection by-products along the typical full-scale drinking water treatment processes显示文摘Identification and characterization of disinfection by-product(DBP)precursors could help optimize drinkingwater treatment processes and improve the quality of finishedwater.This study comprehensively investigated the characteristics of dissolved organic matter(DOM),the hydrophilicity and molecule weight(MW)of DBP precursor and DBP-associated toxicity along the typical full-scale treatment processes.The results showed that dissolved organic carbon and dissolved organic nitrogen content,the fluorescence intensity and the SUVA254 value in raw water significantly decreased after the whole treatment processes.Conventional treatment processes were in favor of the removal of high-MW and hydrophobic DOM,which are important precursors of trihalomethane and haloacetic acid.Compared with conventional treatment processes,Ozone integrated with biological activated carbon(O3-BAC)processes enhanced the removal efficiencies of DOM with different MW and hydrophobic fractions,leading to a further decrease in almost all DBP formation potential and DBP-associated toxicity.However,almost 50%of the detected DBP precursors in raw water has not been removed after the coagulation-sedimentation-filtration integrated with O3-BAC advanced treatment processes.These remaining precursors were found to be mainly hydrophilic and low-MW(<1.0 kDa)organics.Moreover,they would largely contribute to the formation of haloacetaldehydes and haloacetonitriles,which dominated the calculated cytotoxicity.Since current drinking water treatment process could not effectively control the highly toxic DBPs,the removal of hydrophilic and low-MW organics in drinking water treatment plants should be focused on in the future. | Xu Yang Shunke Ding Rong Xiao PinWang Zhenqi Du Ruihua Zhang Wenhai Chu | 2023 | Journal of Environmental Sciences2023，，6： | 2 |
| 8 | Adsorption of perchlorate from aqueous solution by the calcination product of Mg/(A1-Fe) hydrotalcite-like compounds显示文摘 | Yang Yiqiong Gao Naiyun Chu Wenhai | 2012 | Journal of Hazardous Materials2012，，： | 1 |
| 9 | Ozone–biological activated carbon integrated treatment for removal of precursors of halogenated nitrogenous disinfection by-products显示文摘 | Wenhai Chu Naiyun Gao Daqiang Yin Yang Deng Michael R. Templeton | 2011 | Chemosphere2011，，11： | 1 |
| 10 | Ozone-biological activated carbon integrated treatment for removal of precursors of halogenated nitrogenous disinfection by-products 显示文摘 | Wenhai Chu Naiyun Gao Daqiang Yin | 2012 | Chemosphere2012，86，： | 1 |
| 11 | Formation of nitrogenous disinfection by -products from pre -chlo- ramination显示文摘 | Chu Wenhai Gao Naiyun Deng Yang | 2011 | Chemosphere2011，85，7： | 1 |
| 12 | Formation of halogenated C - , N - DBPs from chlor (am) ination and UV irradiation of tyrosine in drinking water显示文摘 | Chu Wenhai Gao Naiyun Krasner S W | 2012 | Envi- ronmental Pollution2012，161，： | 1 |
| 13 | Formation of halogenated C-, N-DBPs from chlor(am)ination and UV irradiation of tyrosine in drinking water显示文摘 | Wenhai Chu Naiyun Gao Stuart W. Krasner Michael R. Templeton Daqiang Yin | 2011 | Environmental Pollution2011，，： | 1 |
| 14 | Degradation of diuron by persulfate activated with ferrous ion显示文摘 | Chaoqun Tan Naiyun Gao Wenhai Chu Cong Li Michael R. Templeton | 2012 | Separation and Purification Technology2012，，： | 1 |
| 15 | Degradation ofdiuron by persulfate activated with ferrous ion 显示文摘 | TAN Chaoqun GAO Naiyun CHU Wenhai f | 2012 | Separation andPurification Technology2012，95，： | 1 |
| 16 | Precursors of dichloroacetamide, an emerging nitrogenous DBP formed dur- ing chlorination or chloramination 显示文摘 | CHU Wenhai GAO Naiyun DENG Yang | 2010 | Environmental Science and Technology2010，44，10： | 1 |
| 17 | Formation of haloac- etamides during chlorination of dissolved organic nitrogen as- partic acid显示文摘 | CHU Wenhai GAO Naiyun DENG Yang | 2010 | Journal of Hazardous Materials2010，173，13： | 1 |
| 18 | The formation of haloacetamides and other disinfection by-products from non-nitrogenous low-molecular weight organic acids during chloramination 显示文摘 | Chu Wenhai Li Xin Bond T | 2016 | Chemical Engineering Journal2016，285，： | 1 |
| 19 | Formation of haloacetamides during chlorination of dissolved organic nitrogen aspartic acid显示文摘 | CHU Wenhai GAO Naiyun DENG Yang | 2010 | Journal of Hazardous Materials2010，173，123： | 1 |
| 20 | Ozone-biological activated carbon integrated treatment for removal of precursors of halogenated nitrogenous disinfection by-products显示文摘 | Chu Wenhai Gao Naiyun Yin Daqiang | 2012 | Chemosphere2012，86，11： | 1 |
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