不同预氧化剂对长江原水氯(胺)化DBPs生成潜能的影响

Effects of Different Pre-oxidants on DBPs Formation Potential by Chlorination and Chloramination of Yangtze River Raw Water

以取自上海市杨树浦水厂的长江原水为研究对象,对比分析了3种常见预氧化剂二氧化氯(ClO2)、高锰酸钾(KMnO4)及氯(Cl2)预氧化对削减氯化和氯胺化消毒副产物(DBPs)生成潜能的效果情况.氯化培养实验结果表明,3种预氧化剂的处理对DBPs总量的去除效果均不显著,经ClO2、Cl2及KMnO4作用后可分别削减8.4%、5.7%及3.9%,效果为ClO2>Cl2>KMnO4.对于长江原水使用氯化消毒时,采用ClO2作为预氧化剂可取得对消毒副产物较好的去除效果.氯胺化培养实验结果表明,3种预氧化剂处理对长江原水氯胺化DBPs的生成潜能影响有较大差异,经ClO2和KMnO4作用后可分别削减18.1%及4.1%,而预氯化后则增高12.3%,对于长江原水使用氯胺化消毒时,采用ClO2作为预氧化剂可取得对消毒副产物较为明显的去除效果.同时,应尽量避免使用预氯化后加氯胺化的组合,以防止在水处理过程中生成更多的DBPs而影响出水水质.

Yangtze River raw water from Yangshupu Water Plant, Shanghai was studied in this paper for reduced formation potential of chlorination and chloramination disinfection by-products （DBPs） after pre-oxidation by three kinds of common pre-oxidants, which were potassium permanganate, chlorine and chlorine dioxide. Results of chlorination showed that removal effectiveness of all the selected oxidants on total chlorination DBPs was not significant, and the reduction percentages by C102 , C12 and KMnO4 were 8.4% , 5.7% and 3.9% , respectively. The order of DBPs control effect was C102 〉 C12〉 KMnO4. As to Yangtze River raw water in case of chlorine disinfection, using CIO2 as pre-oxidation agent showed relatively better effect on removal of DBPs. However, chloramination results demonstrated that impacts of the three preoxidants on DBPs formation potential were quite different, and the reduction percentages by C102 and KMnQ were 18.1% and 4. 1% , respectively, while pre-chlorination increased the potential by 12.3%. These results revealed that C102had the highest removal effectiveness, meanwhile pre-chlorination should be avoided due to its notable increase in DBPs formation.