摘要:
以浙江省钱塘江流域的七种水源水为代表,分析了前体物、pH值、投氯量、氯化时间和温度等因素对氯化消毒副产物(DBPs)中三种卤乙酸(HAAs)和三种三卤甲烷(THMs)的影响.研究表明,总有机碳(TOC)和UV-254与HAAs前体物呈正相关,而与THMs前体物的相关性较差;在pH5-10的范围内,pH值对HAAs的形成影响较小,pH值愈高HAAs总量愈小,而对THMs的形成影响较大,THMs总量随pH值的增高而增大;HAAs和THMs的形成量与投氯量、氯化时间均呈正相关;在正常气温条件下,随温度的增加而增加.
Abstract:
THMs and HAAs, which are two types of disinfection by-products ( DBPs), were studied in the water samples from Qiantang river in Zhejiang province. The results showed that haloacetic acids (HAAs) and trihalo- methane (THMs) are different with variable conditions of DBPs precursors, water temperature, applied chlorine dose, reaction time and pH. TOCand UV-254 had a high correlation with HAAs precursors, but low with THMs precursors. The total THMs concentration increases with increasing pH value in range of 5-10, but the total HAAs concentration slightly decreases with increasing pH value, the chlorine dose and reaction time have a functional relationship with the formation of HAAs and THMs, and the concentration of HAAs and THMs also increased with increasing temperature in the normal range.
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