不同比例的NaOCl/NH_2Cl和ClO_2联用对ClO_2^-的影响  

Effect of various ratios of chlorine/monochloramine and chlorine dioxide on chlorite ions

作　　者：相坤[1] 杨艳玲[1] 李星[1] 张达[1] 刘扬阳[1] 黄柳[1] 许美玲[1] 

机构地区：[1]北京工业大学建筑工程学院,北京100124

出　　处：《哈尔滨工业大学学报》2014年第2期92-97,共6页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金资助项目(51178003);北京市自然科学基金资助项目(8122013);北京工业大学研究生科技基金资助项目(ykj-2012-7025)

摘　　要：为减少二氧化氯(ClO2)氧化时产生的毒害性副产物亚氯酸盐(ClO2-),采用氯(NaOCl)/氨胺(NH2Cl)和ClO2联用的方法,以超纯水为实验水质,考察NaOCl、NH2Cl和ClO2-、ClO2联用时ClO2和ClO2-的变化.结果表明:NaOCl/NH2Cl水解产生的次氯酸(HOCl)和ClO2-反应是NaOCl/NH2Cl和ClO2联用时ClO2-减少、ClO2增加的原因,而且ClO2的增加量多于ClO2-的减少量;NaOCl和ClO2以3∶1联用、NH2Cl和ClO2以1∶1联用时反应速率最大;水中NaOCl和ClO2-、NH2Cl和ClO2-存在比例为1∶1、1∶2时,ClO2-能全部转化为ClO2;相比NaOCl和ClO2联用,等量的NH2Cl和ClO2联用能够更有效地增加ClO2余量,且均具有较高的反应速率.NaOCl/NH2Cl和ClO2联用可以减少ClO2-生成量、增加ClO2余量,NaOCl和ClO2、NH2Cl和ClO2应用于微污染水的氧化时,3∶1、1∶1分别是两种氧化方式减少ClO2-生成量、增加ClO2余量的最小投加比例.The combination of chlorine dioxide （ ClO2 ） and chlorine （NaOCl） or monochloramine （ NH2Cl） was used to degrade the formation of ClO2^-, when ClO2 was used as an effective oxidant which could form undesirable oxidation by-products, i.e. ClO2^-. In this article, Mill-Q water was used, and the impact of NaOCl or NHzCl combined with ClO2or ClO2^-on the yield of ClO2^-and ClO2 were investigated by monitoring the residual of NaOCl, NH2Cl, ClO2 and ClO2^-. It was proved that when NaOCl or NHzCl combined with ClO2, hypoehlorousacid（HOCl） formed by NaOCl or NHzCl could react with ClO2^-, which was the reason that ClO2^-yield reduced and ClO2yield increased, and the increase in ClOzyield exceeded the decrease in ClO2^-yield. For the purpose of the highest reaction rate, the optimal ratio between NaOCl and ClO2 was 3 ： 1, while it was 1 ： 1 between NHzCl and ClO2. The appropriate ratios of residual NaOCl/NH2Cl and ClO2^-for ClO2^-complete removal were found to be close to the value of 1 and 0.5 respectively. Furthermore, compared with NaOCl, equivalent yield of NHzCl had much more ClO2 residual yield when reacted with ClO2, and had faster reaction rate in any ratio. It can be concluded that the generation of ClO2^-is typically much lower and the residual of ClO2 is much higher with combination of ClOzand NaOCl or NH2Cl when compared to the use of ClOzalone. And the minimum ratio between NaOCl and ClO2, NH2Cl and ClOzare 3 ： 1 and 1 ： 1 respectively when used in micro-polluted water.

关 键 词：氯 氯胺 二氧化氯 联用 亚氯酸盐 比例 微污染水 

分 类 号：TU991.36[建筑科学—市政工程]