O_3-BAC工艺对含溴水体消毒副产物生成势的影响

Ozone-biological activated carbon treatment of DBP in high-bromide water

该文主要研究了含溴水体在经过臭氧-生物活性炭(O3-BAC)工艺处理前后消毒副产物生成势的变化。通过加氯培养测定三卤甲烷(THMs)和卤乙酸(HAAs)的生成势。结果表明:进水经过臭氧-生物活性炭系统处理后,总三卤甲烷(TTHM)和9种卤乙酸(HAA9)的生成势均降低了20μg/L左右,抑制率在30%以上。其中,主要去除的是一些含氯的消毒副产物如三氯甲烷、二氯乙酸和三氯乙酸的前体物。当原水中含有高质量浓度的Br-时,臭氧化可能会导致含溴消毒副产物(如三溴甲烷、一溴乙酸和二溴乙酸)占总消毒副产物的分配比例升高。同时,研究表明:活性炭对于溴代副产物(Br-DBPs)前体物的去除效果低于氯代副产物(ClDBPs),因此在经过Q3-BAC工艺处理后,消毒副产物生成势中,溴代产物所占分配比例进一步增加。

The disinfection by-product（DBP） formation of high-bromide water was evaluated before and after ozone and biological activated carbon（O3-BAC）treatment.The objective is to remove trihalomethanes（THMs）and haloacetic acids（HAAs）formed by adding chlorine.The results showed that the O3-BAC treatment reduced the total trihalomethanes（TTHM）and nine haloacetic acid（HAA9）by 20μg/L.The inhibitory rate was above 30%.Precursors of chloro-byproducts（Cl-DBPs）like chloroform,dichloroacetic acid and tichloroacetic acid were also removed.Chloriation of high-bromide water increases the proportion of bromo-byproducts（Br-DBPs）such as bromform,bromoacetic acid and dibromoacetic acid after the pre-ozonation.The BAC treatment reduces the Br-DBP less than that of Cl-DBPs,which resulted in further increases of the Br-DBP proportion.