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GDM过滤技术 1

亲水性 1

生物膜 1

耐氯细菌 1

膜污染 1

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microspheres prepared through a facile aerosol-based process for the simultaneous adsorption and reduction of chlorinated

Bhanukiran SUNKARA,Yang SU,Jingjing ZHAN,Jibao HE,Gary L. MCPHERSON,Vijay T. JOHN

《环境科学与工程前沿（英文）》 2015年 第9卷 第5期   页码 939-947 doi: 10.1007/s11783-015-0807-9

摘要： Iron-carbon (Fe-C) composite microspheres prepared through a facile aerosol-based process are effective remediation agents for the simultaneous adsorption and reduction of chlorinated hydrocarbons. Complete dechlorination was achieved for the class of chlorinated ethenes that include tetrachloroethylene (PCE), trichloroethylene (TCE), and -1,2-dicloroethylene (c-DCE, t-DCE), 1,1-dichloroethylene (1,1-DCE) and, vinyl chloride (VC). The Fe-C particles potentially provides multi-functionality with requisite characteristics of adsorption, reaction, and transport for the effective in situ remediation of chlorinated hydrocarbons. The carbon support immobilizes the ferromagnetic iron nanoparticles onto its surface, thereby inhibiting aggregation. The adsorptive nature of the carbon support prevents the release of toxic intermediates such as the dichloroethylenes and vinyl chloride. The adsorption of chlorinated ethenes on the Fe-C composites is higher (>80%) than that of humic acid (<35%) and comparable to adsorption on commercial activated carbons (>90%). The aerosol-based process is an efficient method to prepare adsorptive-reactive composite particles in the optimal size range for transport through the porous media and as effective targeted delivery agents for the in situ remediation of soil and groundwater contaminants.

关键词： chlorinated ethene     iron-carbon     aerosol     adsorption     reductive dechlorination    

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Electrochemical reduction characteristics and the mechanism of chlorinated hydrocarbons at the copper

XU Wenying, GAO Tingyao, ZHOU Rongfeng, MA Lumin

《环境科学与工程前沿（英文）》 2007年 第1卷 第2期   页码 207-212 doi: 10.1007/s11783-007-0036-y

摘要： The electrochemical reduction characteristics of chlorinated hydrocarbons were investigated by cyclic voltammetry technique. The reduction mechanism and activity of the chlorinated hydrocarbons at the copper electrode were explored. The relationship between the structure of chlorinated hydrocarbons and their reductive activity were discussed. The experimental results showed that chlorinated alkanes and a portion of chlorinated aromatic hydrocarbons could be reduced directly at the copper electrode. However, chlorinated aromatic hydrocarbons were not easy to reduce at the copper electrode. The results provided a theoretical basis for the catalyzed iron inner electrolysis method.

关键词： electrolysis     chlorinated     relationship     mechanism     voltammetry technique    

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Degradation of chlorinated phenols by nanoscale zero-valent iron

CHENG Rong, WANG Jianlong, ZHANG Weixian

《环境科学与工程前沿（英文）》 2008年 第2卷 第1期   页码 103-108 doi: 10.1007/s11783-008-0009-9

摘要： Chlorophenols (CPs), as important contaminants in groundwater, are toxic and difficult to biodegrade. Recently nanoscale zero-valent iron received a great deal of attention because of its excellent performance in treating recalcitrant compounds. In this study, nanoscale zero-valent iron particles were prepared using chemical reduction, and the reductive transformations of three kinds of chlorinated phenols (2-CP, 3-CP, and 4-CP) by nanoscale zero-valent iron under different conditions were investigated. The transformation process of the CPs was shown to be dechlorination first, then cleavage of the benzene ring. The removal efficiency of the CPs varied as follows: 2-CP > 3-CP > 4-CP. The reactivity of CPs was associated with their energy of lowest unoccupied molecular orbit (). With the increase in initial concentrations of CPs, removal efficiency decreased a little. But the quantities of CPs reduced increased evidently. Temperature had influence on not only the removal efficiency, but also the transformation pathway. At higher temperatures, dechlorination occurred prior to benzene ring cleavage. At lower temperatures, however, the oxidation product was formed more easily.
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Decomposition of aqueous chlorinated contaminants by UV irradiation with H

Eunsung KAN,Chang-Il KOH,Kyunghyuk LEE,Joonwun KANG

《环境科学与工程前沿（英文）》 2015年 第9卷 第3期   页码 429-435 doi: 10.1007/s11783-014-0677-6

摘要： In the present study, the decomposition rates of carbon tetrachloride (CCl ) and 2,4-dichlorophenol (2,4-DCP) in water by the ultraviolet (UV) light irradiation alone and H O /UV were experimentally investigated. The detailed experimental studies have been conducted for examining treatment capacities of the two different ultraviolet light sources (low and medium pressure Hg arc) in H O /UV processes. The low or medium UV lamp alone resulted in a 60%–90% decomposition of 2,4-DCP while a slight addition of H O resulted in a drastic enhancement of the 2,4-DCP decomposition rate. The decomposition rate of 2,4-DCP with the medium pressure UV lamp alone was about 3–6 times greater than the low pressure UV lamp alone. In the direct photolysis of aqueous CCl , the medium pressure UV lamp had advantage over the low pressure UV lamp because the molar extinction coefficient of CCl at shorter wavelength (210–220 nm) is about 20 to 50 times higher than that at 254 nm. However, adding H O to the medium pressure UV lamp system rendered a negative oxidation rate because H O acted as a UV absorber being competitive with CCl due to negligible reaction between CCl and OH radicals. The results from the present study indicated significant influence of the photochemical properties of the target contaminants on the photochemical treatment characteristics for designing cost-effective UV-based degradation of toxic contaminants.

关键词： H2O2/ultraviolet (UV) light     advanced oxidation     UV light irradiation     chlorinated contaminants     photochemical treatment characteristics    

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A pilot scale test of ozonization treatment of ethene wastewater for reuse

ZHONG Li, REN Wei, GUO Wenjing

《化学科学与工程前沿（英文）》 2008年 第2卷 第2期   页码 191-195 doi: 10.1007/s11705-008-0028-x

摘要： A pilot scale test of advanced treatment of ethene wastewater by ozonization was carried out for industrial water reuse. Effects of different operating conditions on COD degradation, such as wastewater flow rate, ozonized gas flow rate, operating voltage of ozonizer and two ozone generation means, using pure oxygen or air, was investigated. The results show that the increase of ozonizer operating voltage, the decrease of wastewater flow rate and the suitable ozonized gas flow rate improve the removal of COD in wastewater and that ozone generated respectively from air and pure oxygen can effectively remove COD of ethene wastewater to meet the industrial water reuse criterion.

关键词： different     industrial     oxygen     generation     criterion    

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Fenton process for degradation of selected chlorinated aliphatic hydrocarbons exemplified by trichloroethylene

QIANG Zhimin, BEN Weiwei, HUANG Chin-Pao

《环境科学与工程前沿（英文）》 2008年 第2卷 第4期   页码 397-409 doi: 10.1007/s11783-008-0074-0

摘要： The degradation of selected chlorinated aliphatic hydrocarbons (CAHs) exemplified by trichloroethylene (TCE), 1,1-dichloroethylene (DCE), and chloroform (CF) was investigated with Fenton oxidation process. The results indicate that the degradation rate was primarily affected by the chemical structures of organic contaminants. Hydroxyl radicals (OH) preferred to attack the organic contaminants with an electron-rich structure such as chlorinated alkenes (i.e., TCE and DCE). The dosing mode of Fenton’s reagent, particularly of Fe, significantly affected the degradation efficiency of studied organic compound. A new “time-squared” kinetic model, = exp(-), was developed to express the degradation kinetics of selected CAHs. This model was applicable to TCE and DCE, but inapplicable to CF due to their varied reaction rate constants towards OH. Chloride release was monitored to examine the degree of dechlorination during the oxidation of selected CAHs. TCE was more easily dechlorinated than DCE and CF. Dichloroacetic acid (DCAA) was identified as the major reaction intermediate in the oxidation of TCE, which could be completely removed as the reaction proceeded. No reaction intermediates or byproducts were identified in the oxidation of DCE and CF. Based on the identified intermediate, the reaction mechanism of TCE with Fenton’s reagent was proposed.

关键词： identified     1     1-dichloroethylene     kinetic     Dichloroacetic     Chloride    

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Kinetics and mechanisms of reactions for hydrated electron with chlorinated benzenes in aqueous solution

Haixia YUAN,Huxiang PAN,Jin SHI,Hongjing LI,Wenbo DONG

《环境科学与工程前沿（英文）》 2015年 第9卷 第4期   页码 583-590 doi: 10.1007/s11783-014-0691-8

摘要： The reactions between chlorinated benzenes (CBzs) and hydrated electron ( ) were investigated by the electron beam (EB) and laser flash photolysis (LFP) experiments. Under the EB irradiation, the effects of irradiation dose, initial concentration and the number of Cl atoms on the removal efficiencies were further examined. At 10 kGy, the removal efficiencies of mono-CB, 1,3-diCB, 1,2-diCB and 1,4-diCB were 41.2%, 87.2%, 84.0%, and 84.1%, respectively. While irradiation dose was 50 kGy, the removal efficiencies increased to 47.4%, 95.8%, 95.0%, and 95.2%, respectively. Irradiation of CBzs solutions has shown that the higher the initial concentration, the lower the percentage of CBzs removal. In addition to this, the dechlorination efficiencies of 1,2-dichlorobenzene (1,2-diCB), 1,3-dichlorobenzene (1,3-diCB) and 1,4-dichlorobenzene (1,4-diCB) were much higher than that of chlorobenzene (mono-CB). The kinetics of the reactions was achieved with nanosecond LFP. The rate constants of second-order reaction between with mono-CB, 1,2-diCB, 1,3-diCB and 1,4-diCB were (5.3±0.4) × 10 , (4.76±0.1) × 10 , (1.01±0.1) × 10 and (3.29±0.2) × 10 L·mol ·s , respectively. Density functional theory (DFT) calculations were performed to determine the optical properties of unstable CBzs anion radicals, and the main absorption peaks lied in the range of 300–550 nm. The primary reaction pathway of CBzs with was gradual dechlorination, and the major products were Cl and benzene (CBzs(-Cl )). Furthermore, biphenyl (or chlorobiphenyl) was observed during the LFP, which was probably formed by recombination of benzene radicals.

关键词： chlorinated benzenes     hydrated electron     electron beam     laser flash photolysis    

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The influence of chlorinated aromatics' structure on their adsorption characteristics on activated carbon

Pengfei LIN,Yuan ZHANG,Xiaojian ZHANG,Chao CHEN,Yuefeng XIE,Irwin H SUFFET

《环境科学与工程前沿（英文）》 2015年 第9卷 第1期   页码 138-146 doi: 10.1007/s11783-014-0725-2

摘要： This study focused on evaluating the efficiency of powdered activated carbon (PAC) adsorption process and tackling chlorobenzenes and chlorophenols spill in drinking water source. The adsorption kinetics and PAC’s capacities for five chlorobenzenes and three chlorophenols at drinking water contamination levels were studied in order to determine the influence of different functional groups on the adsorption behavior. The results showed that PAC adsorption could be used as an effective emergency drinking water treatment process to remove these compounds. The adsorption kinetics took 30 min to achieve nearly equilibrium and could be described by both pseudo first-order and pseudo second-order models. A mathematic relationship was developed between the pseudo first-order adsorption rate constant, k , and the solutes’ properties including lg , polarizability and molecular weight. The Freundlich isotherm equation could well describe the adsorption equilibrium behaviors of chlorinated aromatics with from 0.920 to 0.999. The H-bond donor/acceptor group, hydrophobicity, solubility and molecular volume were identified as important solute properties that affect the PAC adsorption capacity. These results could assist water professionals in removing chlorinated aromatics during emergency drinking water treatment.

关键词： chlorinated aromatics     adsorption     powdered activated carbon     kinetics     equilibrium    

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氯化水与地表水导致的膜污染对比解析——生物污染特性和微生物探究 Article

张莉, 徐磊, Nigel Graham, 俞文正

《工程（英文）》 2022年 第15卷 第8期   页码 154-164 doi: 10.1016/j.eng.2021.03.016

摘要：

氯在城市水处理过程中通常用于灭活病原体和预防水媒疾病，但是目前尚不清楚其作为一种预处理技术是否能够有效地缓解超滤过程中产生的膜污染。在本研究中，我们探究了自来水在重力驱动膜过滤系统中对生物膜的形成及生物污染的影响。同时，未处理的地表水（湖水）所形成的生物膜/生物污染也进行了对比研究。研究表明，自来水过滤系统产生了比湖水更严重的膜污染，而且多糖和eDNA的含量更高。其生物膜形态致密，但是湖水形成的生物膜是多孔、类似蜘蛛网状的结构，猜测可能与生物膜中的细菌有关。16S rRNA测序结果表明，Xanthobacter在自来水形成的生物膜中占据优势地位。此外，研究发现膜的亲、疏水性对膜污染特性和微生物群落的影响较小。本研究揭示了耐氯细菌在膜污染形成中的重要作用，更深入地认识了膜污染，可为寻求有效的膜污染控制方法提供帮助。

关键词： 膜污染     生物膜     GDM过滤技术     超滤     耐氯细菌     亲水性    

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Microbial responses to combined oxidation and catalysis treatment of 1,4-dioxane and co-contaminants in groundwater and soil

Yu Miao, Nicholas W. Johnson, Kimberly Heck, Sujin Guo, Camilah D. Powell, Thien Phan, Phillip B. Gedalanga, David T. Adamson, Charles J. Newell, Michael S. Wong, Shaily Mahendra

《环境科学与工程前沿（英文）》 2018年 第12卷 第5期 doi: 10.1007/s11783-018-1071-6

摘要：

Groundwater microbial community was altered after catalysis and chemical oxidation.

The coupled treatment train removed 90% 1,4-dioxane regardless of co-contaminants.

Dynamics of microbial populations varied along with different treatment stages.

Many microbial taxa exhibited resilience against oxidative and catalytic treatments.

Metagenomic analysis will be valuable for long-term management of polluted sites.

关键词： Coupled treatments     Chlorinated solvents     Diethylene ether     Biological diversity     Microbial populations     Biomarkers    

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标题 作者 时间 类型 操作

microspheres prepared through a facile aerosol-based process for the simultaneous adsorption and reduction of chlorinated

Bhanukiran SUNKARA,Yang SU,Jingjing ZHAN,Jibao HE,Gary L. MCPHERSON,Vijay T. JOHN

期刊论文

Electrochemical reduction characteristics and the mechanism of chlorinated hydrocarbons at the copper

XU Wenying, GAO Tingyao, ZHOU Rongfeng, MA Lumin

期刊论文

Degradation of chlorinated phenols by nanoscale zero-valent iron

CHENG Rong, WANG Jianlong, ZHANG Weixian

期刊论文

Decomposition of aqueous chlorinated contaminants by UV irradiation with H

Eunsung KAN,Chang-Il KOH,Kyunghyuk LEE,Joonwun KANG

期刊论文

A pilot scale test of ozonization treatment of ethene wastewater for reuse

ZHONG Li, REN Wei, GUO Wenjing

期刊论文

Fenton process for degradation of selected chlorinated aliphatic hydrocarbons exemplified by trichloroethylene

QIANG Zhimin, BEN Weiwei, HUANG Chin-Pao

期刊论文

Kinetics and mechanisms of reactions for hydrated electron with chlorinated benzenes in aqueous solution

Haixia YUAN,Huxiang PAN,Jin SHI,Hongjing LI,Wenbo DONG

期刊论文

The influence of chlorinated aromatics' structure on their adsorption characteristics on activated carbon

Pengfei LIN,Yuan ZHANG,Xiaojian ZHANG,Chao CHEN,Yuefeng XIE,Irwin H SUFFET

期刊论文

氯化水与地表水导致的膜污染对比解析——生物污染特性和微生物探究

张莉, 徐磊, Nigel Graham, 俞文正

期刊论文

Microbial responses to combined oxidation and catalysis treatment of 1,4-dioxane and co-contaminants in groundwater and soil

Yu Miao, Nicholas W. Johnson, Kimberly Heck, Sujin Guo, Camilah D. Powell, Thien Phan, Phillip B. Gedalanga, David T. Adamson, Charles J. Newell, Michael S. Wong, Shaily Mahendra

期刊论文