二氧化氯预氧化生成无机消毒副产物的研究  

Formation of Inorganic Disinfection By-products during Chlorine Dioxide Pre-oxidation

作　　者：王晓云 付爱民 WANG Xiao-yun;FU Ai-min(College of Ecological Environment and Urban Construction,Fujian University of Technology,Fuzhou 350008,China;Fujian Ningde Nuclear Power Company Limited,Ningde 355200,China)

机构地区：[1]福建工程学院生态环境与城市建设学院,福建福州350008 [2]福建宁德核电有限公司,福建宁德355200

出　　处：《中国给水排水》2021年第23期34-39,共6页China Water & Wastewater

基　　金：福建省高校产学合作重大项目(2019H6003)。

摘　　要：为了研究二氧化氯对不同人工合成水样预氧化的反应情形以及对无机消毒副产物(IDBPs)生成的影响,以腐殖酸(HA)模拟水中有机物,在不同酸碱环境下,考察了各项反应参数对二氧化氯氧化有机物以及IDBPs生成量的影响;并分析了不同溴离子浓度与HA浓度对二氧化氯氧化的竞争作用,考察了溴离子对IDBPs各物质变化趋势的影响。结果表明,二氧化氯在水中的降解反应受到不同酸碱水质条件的影响,酸性水质条件有利于氯离子的生成,碱性条件有利于亚氯酸根离子的生成。有机物的存在会催化IDBPs的生成,纯水中因发生降解反应仅有不超过38%的二氧化氯反应生成IDBPs,而经有机物催化后,有80%~95%的二氧化氯反应生成IDBPs。在添加溴离子后,由溴离子的减少可知,二氧化氯或其水解中间产物将氧化溴离子,但不会生成溴酸根离子,而且溴离子对余氯的消耗将减缓二氧化氯在纯水中的降解反应。在HA环境下,单位二氧化氯消耗量对应的亚氯酸根生成量将随溴离子浓度的增加而减少,尤其在碱性环境下更明显。To explore the pre-oxidation of different synthetic water samples by chlorine dioxide and the effect of chlorine dioxide on formation of inorganic disinfection by-products(IDBPs),effects of various reaction parameters on oxidation of humic acid(HA)in simulated water by chlorine dioxide and formation of IDBPs were investigated under different acid-base conditions.In addition,the competitive effect of different bromine concentration and HA concentration on chlorine dioxide oxidation was analyzed,and the influence of bromine ion on variation trend of IDBPs species was investigated.The results showed that the degradation of chlorine dioxide in water was affected by acidic and alkaline water conditions.The acidic water condition was favorable to the formation of chlorine ion,whereas the alkaline condition was favorable to the formation of chlorite ion.The presence of organic matter catalyzed the formation of IDBPs.In pure water,only no more than 38%of chlorine dioxide reacted to generate IDBPs because of degradation reaction of chlorine dioxide,while about 80%-95%of chlorine dioxide reacted to generate IDBPs after catalyzed by organic matter.After the addition of bromine ions,the reduction of bromine ions indicated that the chlorine dioxide or its hydrolysis intermediate would oxidize bromine ions.However,no bromate ions were formed,and the consumption of residual chlorine by bromine ions slowed the degradation rate of the chlorine dioxide in pure water.When HA was present,chlorite production per unit chlorine dioxide consumption decreased with the increase of bromine ion concentration,and the phenomena was more obvious specially at alkaline condition.

关 键 词：二氧化氯 预氧化 无机消毒副产物 溴离子 腐殖酸 氯酸根离子 亚氯酸根离子 

分 类 号：TU991[建筑科学—市政工程]