中压紫外对碘酸根的降解及后续氯胺化I-THM生成特性

发布时间：2018-03-02 00:11

本文关键词： 碘代消毒副产物中压紫外辐照氯胺化　出处：《中国环境科学》2017年02期 　论文类型：期刊论文

【摘要】：以碘酸根为研究对象,研究中压紫外对碘酸根的降解速率,天然有机物及共存碘离子对其降解速率影响,在此基础上,采用氯胺消毒方式,考察溶液pH、氯胺投加量及溴离子浓度对碘代消毒副产物的生成影响.研究发现,饮用水中压紫外消毒工艺对碘酸根具有明显降解作用,其光反应产物为碘离子.降解过程符合拟一级反应动力学方程,中压紫外光强为8.5mW/cm~2时,其拟一级反应速率常数为(0.403±0.059)×10~(-3)s~(-1).水中天然有机物(NOM)可促进紫外光对碘酸根的降解,而初始碘离子浓度会抑制碘酸根降解.含碘酸盐原水经中压紫外光照射后,后续氯胺消毒工艺将大量产生碘代三卤甲烷(I-THMs).因此在采用中压紫外/氯胺联合消毒的净水工艺中,碘酸根转化后形成碘代消毒副产物的风险应当引起关注.
[Abstract]:The degradation rate of iodate by medium pressure ultraviolet was studied. The degradation rate of natural organic compounds and co-existing iodine ions were studied. On the basis of this, chloramines were used to sterilize the iodides. The effects of pH of solution, dosage of chloramine and concentration of bromine on the formation of by-products of iodinated disinfection were investigated. The photoreaction product is iodide ion. The degradation process accords with the pseudo-first-order reaction kinetics equation. The medium pressure ultraviolet light intensity is 8.5 MW / cm ~ 2:00, and its pseudo-first-order reaction rate constant is 0.403 卤0.059) 脳 10 ~ (10) ~ (3) ~ (3) C ~ (-1) C ~ (-1). The degradation of iodate by ultraviolet light can be promoted by natural organic matter (Nom) in water. The initial concentration of iodine ion can inhibit the degradation of iodate radical. After the raw water containing iodate salt is irradiated by medium pressure ultraviolet light, the subsequent chloramine disinfection process will produce a large number of trihalomethane iodide (Thalomethane) I-THMsN. Therefore, in the process of purifying water with medium pressure UV / chloramine combined disinfection, The risk of the formation of iodinated disinfection by-products after the transformation of iodate should be concerned.
【作者单位】：同济大学环境科学与工程学院污染控制与资源化研究国家重点实验室;
【基金】：水体污染控制与治理科技重大专项水体污染控制与治理科技重大专项(2015ZX07406004)
【分类号】：TU991.2

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