BrO_3^-等溴类物质在长江水氯化过程中的形成

Formation of BrO_3^- et al. bromine kind matter in chlorination water of Yangtze River.

研究长江上海段原水中Br-在氯化过程中的产物,以BrO3-、Br-和三卤甲烷(THMs)为主要测定物,考察pH值、氯投加量和Br-浓度对三者生成量的影响.研究表明,BrO3-在氯化过程中的形成缓慢,其生成量与氯投加量正相关,常规消毒条件下不会超过10μg/L的国家标准.在余氯充足的情况下,增加Br-浓度主要增加了总有机溴(TOBr),而BrO3-生成量基本不变,弱碱性条件有利于TOBr的生成;THMs和TOBr有一定相关性,Br-浓度升高将导致THMs生成量增加,其中三氯甲烷浓度下降,混合取代的THMs浓度先增加后减少,三溴甲烷浓度显著上升.

The products of Br^- in chlorination process in Shanghai section raw water of Yangtze River was studied, using BrO3^-, Br^- and trihalomethanes（THMs） as the main detection matter. The influence of pH value, chlorine adding amount and Br^-concentration on the production amounts of these three products was explored. The formation of BrO3^- in chlorination process was slow relatively. Its production amount related positively with chlorine adding amount, could not exceed the national 10μg/L standards under the rule disinfection condition. Under the condition of residual chlorine satisfying, increasing Br concentration increased mainly the amount of total organic bromine（TOBr）, whereas BrO3^- production amount was not changed basically. Weak alkaline condition was favorable to the formation of TOBr; THMs and TOBr had definite relationship, enhancing Br concentration would induce the increase of production amount of trihalomethanes in which chloroform concentration lowered, mixed substitute THMs increased first, then decreased, bromoform increased markedly.