中压紫外/氯水处理工艺过程中氯的分解规律  

Decomposition of chlorine during medium pressure UV/chlorine water treatment process

作　　者：田芳 陆昱 郭光 贲伟伟[2] 丁克强 梁正超 郭晓正 张蜀贵 TIAN Fang;LU Yu;GUO Guang;BEN Weiwei;DING Keqiang;LIANG Zhengchao;GUO Xiaozheng;ZHANG Shugui(College of Environmental Engineering,Nanjing Institute of Technology,Nanjing 211167,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]南京工程学院环境工程学院,南京211167 [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》2021年第2期572-579,共8页Chinese Journal of Environmental Engineering

基　　金：国家自然科学青年基金资助项目(51608257,31600091);中国科学院饮用水科学与技术重点实验室开放基金课题(17K01KLDWST);环境模拟与污染控制国家重点联合实验室开放基金课题(18K01ESPCT);南京工程学院大学生科技创新项目(TB201912004,TB201912034,TB202012022);江苏省高等学校大学生创新创业训练计划项目(201911276146H)。

摘　　要：在中压紫外/氯高级氧化技术应用于去除水中微量污染物的过程中,氯的浓度会由于光解作用而降低,直接影响该技术的处理效率。为解决上述问题,通过测定不同中压紫外剂量下氯浓度的变化,研究了氯的分解规律,以及氯投加量、pH、温度、腐殖酸和常见阴离子等条件对氯分解速率的影响。结果表明,氯的分解遵循一级动力学,其分解速率常数k_(obs)随着氯初始浓度的降低而增加,随pH、腐殖酸浓度及温度升高而增加;在一定范围内k_(obs)与pH或腐殖酸浓度成正相关关系;温度由15℃升高至26℃也使氯的分解速率提高了1倍,主要归因于氯自身的分解随温度升高而加快,而非紫外光解速率提高导致;水中主要阴离子Cl^(−)、NO3^(-)、HCO3^(-)、SO4^(2-)的存在对氯的分解速率几乎没有影响。以上研究结果可为中压紫外/氯水处理工艺设计,尤其是氯投加量和紫外剂量等工艺参数设计提供数据支持。Chlorine concentration will decrease with the increase of UV dose due to photolysis during the application of medium pressure UV/chlorine advanced oxidation technology to remove micro-pollutants in water,which affects the treatment efficiency of the technology.By measuring the change of chlorine concentration under different medium pressure UV doses,the decomposition laws of chlorine were studied at different chlorine dosage,pH,temperature,humic acid and common anions.The results show that the decomposition of chlorine followed the first-order kinetics,and its decomposition rate constant(k_(obs))increased with the decrease of initial concentration of chlorine,while it increased with the increase of pH,humic acid concentration and temperature.Within a certain range,k_(obs)presented a linear positive correlation with pH or humic acid concentration.The k_(obs)was doubled when the temperature increased from 15℃to 26℃,which was mainly due to the increase of decomposition rate of chlorine itself with the increase of temperature,not due to the increase of chlorine photolysis rate by UV.The main anions Cl^(−),NO3^(-),HCO3^(-),SO4^(2-)in water had little effect on the decomposition rate of chlorine.This study can provide data support and theoretical basis for the design of medium pressure ultraviolet/chlorine water treatment process,especially for the design of chlorine and ultraviolet dosages.

关 键 词：中压紫外 水处理 自由氯 动力学 

分 类 号：X131.2[环境科学与工程—环境科学]