VUV/UV/Cl2工艺去除饮用水中的乐果  

Removal of dimethoate in drinking water by VUV/UV/Cl2 process

作　　者：吴铮笛 陈芳艳 唐玉斌 王新刚 李梦凯[2] 强志民[2] WU Zhengdi;CHEN Fangyan;TANG Yubin;WANG Xingang;LI Mengkai;QIANG Zhimin(School of Environmental and Chemical Engineering,Jiangsu University of Science and Technology,Zhenjiang 212003,China;Key Laboratory of Drinking Water Science and Technology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China)

机构地区：[1]江苏科技大学环境与化学工程学院,镇江212003 [2]中国科学院生态环境研究中心,饮用水科学与技术重点实验室,北京100085

出　　处：《环境工程学报》2020年第2期305-311,共7页Chinese Journal of Environmental Engineering

基　　金：国家重点研发计划项目(2016YFC0400802)。

摘　　要：乐果是常规饮用水处理技术难以去除的一种典型有机磷农药。为了能够控制并去除饮用水中的农药残留,达到进一步净化水质的目的,建立了降解动力学模型,采用模拟降解饮用水中乐果的方法,对比了乐果在紫外(UV)、氯(Cl2)、紫外/氯(UV/Cl2)、真空紫外/紫外(VUV/UV)和真空紫外/紫外/氯(VUV/UV/Cl2)5种工艺下的去除效果,并考察了乐果初始浓度、Cl2投加量、溶液p H、水中共存天然有机物(NOM)和无机阴离子(NO3^-、Cl-、HCO3^-、SO42^-)对VUV/UV/Cl2工艺降解乐果的影响。结果表明:VUV/UV/Cl2对乐果的降解效率最高,乐果的去除率随其初始浓度的增加而减小;适当增加Cl2投加量,可提高乐果的降解效率;提高p H有利于乐果的降解;NOM对乐果的降解有一定的抑制作用;水中共存无机阴离子NO3^-、Cl^-和HCO3^-可以捕获反应体系中的强氧化性羟基自由基(HO·),对乐果的降解起到抑制作用,而SO42-因其捕获HO·的速率很低,无抑制作用。In order to control and remove pesticide residues in drinking water and achieve the purpose of further purification of water quality,a degradation kinetic model was established,and a method for simulating degradation of dimethoate(DMT)in drinking water was selected.DMT is a typical organophosphorus pesticide and is difficult to remove by conventional drinking water treatment technologies.The removal efficiencies of DMT by five treatment processes including ultraviolet(UV),chlorine(Cl2),UV/Cl2,vacuum-UV/UV(VUV/UV)and VUV/UV/Cl2 were investigated comparatively.The effects of initial DMT concentration,Cl2dosage,solution p H,co-existing natural organic matter(NOM)and inorganic anions(N O3^-,Cl^-,HCO3^-,SO42^-)in water on DMT degradation by VUV/UV/Cl2 were explored.The results indicated that the VUV/UV/Cl2 process was the most efficient one to remove DMT.The DMT removal rate decreased with the increase of its initial concentration.The increase of the Cl2 dosage to a certain extent improved DMT removal,and the increase of p H also facilitated DMT removal.NOM exhibited a certain inhibition on DMT removal.Co-existing inorganic anions including NO3^-,Cl^-andHCO3^-in water could capture the hydroxyl radicals(HO·)generated in the reaction system,thus inhibiting DMT removal,while SO42-reacted with HO·very slowly and did not show any inhibitory effect.

关 键 词：VUV/UV/Cl2 乐果 去除 饮用水处理 

分 类 号：X703[环境科学与工程—环境工程]