紫外线消毒对砂滤水中余氯及三卤甲烷的影响  

Effect of UV disinfection on residual chlorine and THMs formation in filter water

作　　者：李聪[1] 赵敬国[1] 杨玉龙[1] 赵桃桃 

机构地区：[1]浙江大学建筑工程学院,浙江杭州310058

出　　处：《浙江大学学报（工学版）》2016年第3期545-550,共6页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(51208455);高等学校博士学科点专项科研基金资助项目(20110101120033);水体污染控制与治理重大专项(2012ZX07403)

摘　　要：以嘉兴市某水厂砂滤出水为对象,对经过工业紫外线消毒装置照射后水中余氯的衰减规律以及消毒副产物三卤甲烷的生成量进行研究.实验结果表明:随着紫外线剂量的增加,水中余氯总体呈减小的趋势.当紫外线剂量小于540mJ/cm2时,余氯的质量衰减速率较快;当辐照剂量为0和270mJ/cm2时,反应5h后,余氯的质量浓度分别为1.54和0.92mg/L,衰减幅度达40%.当紫外线剂量为1 620mJ/cm2时,余氯的质量浓度为0.61mg/L.初始余氯的质量浓度与其衰减速率成负相关关系.有紫外线照射比无紫外照射时三卤甲烷(THMs)生成量会有增加,水样初始余氯的质量浓度分别为2.5和3.75mg/L,紫外线照射剂量为1 620mJ/cm2,反应24h后,三卤甲烷的质量浓度分别是88.48和103.88μg/L,相对无紫外线照射时,分别增加50%和66%.经紫外线照射后,水样中总有机碳值减小.当紫外剂量相同时,相对于低紫外照射强度,高强度下水样中余氯的质量浓度更高,三卤甲烷的质量浓度更低.On the filter water of a waterworks in Jiaxing,a test was conducted to investigate the decay of residual chlorine and the formation of disinfection by-products（DBPs）after ultraviolet（UV）combined with disinfectant.Results show that the residual chlorine concentration is in decay with the increase of the UV radiation dose.When the UV dosage is below 540mJ/cm2,the chlorine decay rate is faster.When the reaction time is 5h,the residual chlorine in drinking water decreases from 1.54mg/L to 0.92mg/L and reduce by 40% when the UV dosage increases from 0to 270mJ/cm2.The residual chlorine is 0.61mg/L when the UV radiation dose reaches 1 620mJ/cm2.The initial residual chlorine concentration is negatively related to its decay rate.The formation of THMs（trihalomethanes）under UV disinfection is more than the no ultraviolet.And the THMs increases from 88.48μg/L to 103.88μg/L as the initial chlorine concentration increases from 2.5mg/L to 3.75mg/L at the UV dosage of 1 620mJ/cm2,which has increased by 50% and 66%,respectively,as compared with the no ultraviolet irradiation.The total organic carbon（TOC）value decreases in water after UV disinfection.The concentration of the residual chlorine is higher and the formation of THMs is lower under high UV intensity than low UV intensity under the same UV dosage.

关 键 词：砂滤水 紫外线照射 消毒 余氯 衰减 三卤甲烷(THMs) 

分 类 号：TU991.2[建筑科学—市政工程]