腐殖酸氯消毒副产物生成潜力评估指标的研究

Assessment parameter for disinfection by-products formation potential of humic acids

目的探讨腐殖酸氯消毒副产物生成潜力评估指标。方法选用2种商品腐殖酸和1种提取白活性污泥的腐殖酸作为目标物（1．67，10mg／L）进行氯化消毒过程的实验室模拟研究，检测254nm紫外吸光度（UV254）、总有机碳（TOC）、三卤甲烷（THMs）、卤代乙酸（HAAs）并进行线性拟合。结果3种腐殖酸在氯化消毒过程中均能产生THMs和HAAs，其中THMs的生产潜力为11．63-43．61μg／mgTOC，HAAs的生产潜力为11．03～24．06μg／mgTOC。HAAs的生成潜力与单位TOC的腐殖酸254nm紫外吸收（SUVA）具有较好相关性（P〈0．05）。采用SUVA与腐殖酸氧含量的乘积作为参数，与THMs类物质的产生具有更好的相关性（P〈0．05）。结论三氯甲烷和氯乙酸（二氯乙酸、三氯乙酸、一氯乙酸）分别是主要的THMs和HAAs类氯消毒副产物。SUVA和SUVA与腐殖酸氧含量的乘积可分别用作氯消毒过程中HAAs和THMs类副产物生成潜力的评价指标。

Abstract：Objective To study the formation potential of disinfection by-products of humie acid. Methods Two different commercial humic acids and one humic acid extracted from activated sludge were selected as the target substances in this study and the simulated experiments were conducted. Results Formation of trihalomethanes （THMs） and haloacetic acids （HAAs） was observed in all systems containing each of the three humic acids, while the THMs formation potential ranged from ! 1.63- 43.61 μg/mg TOC, and the HAAs 11.03-24.06 μg/mg TOC. Formation potential of HAAs was highly related to per unit of TOC＇s ultraviolet absorption at 254 nm fSUVA） of each humic acid. However, the product of SUVA and oxygen content of humic acid （SUVAxO%） was found more suitable to fix the formation potential of THMs. Conclusion Trichloromethane and dichloro-, trichloro-, chloro-acetic acids were the main by-products belonging to THMs and HAAs respectively. Values of SUVA and（SUVA×0%） can be used as the indexes to assess the formation potential of THMs and HAAs by：products of humic acids, respectively.