不同饮用水处理工艺中消毒副产物的生成潜能
- Title:
- Disinfection By-products Formation Potential of in Different Drinking Water Treatment Processes
- Keywords:
- font-size: 10pt; ">drinking water treatment; disinfection by- font-size: 10pt; ">products; formation potential; Br-; cytotoxicity
- 摘要:
-
对取自饮用水处理过程中的水样分别进行氯消毒和氯胺消毒，分析不同饮用水处理工艺对7类18种消毒副产物(DBPs)生成潜能的影响，测定的DBPs包括含碳DBPs［三卤甲烷（THMs）、卤乙酸（HAAs）、卤代酮（HKs）、三氯乙醛（CH）］和含氮DBPs［卤乙腈（HANs）、三氯硝基甲烷（TCNM）、总亚硝胺（TONO）］。结果表明，混凝、沉淀和过滤工艺均能有效降低卤代DBPs的生成潜能，活性炭吸附反而会增大TONO的生成潜能。混凝和砂滤工艺对去除含碳DBPs前体物更有效，氧化处理工艺则更有利于含氮DBPs前体物的去除。细胞毒性主要来源于HANs和HAAs，且其变化趋势大致与HANs和HAAs生成潜能一致。水中Br-浓度的增加会显著增大溴代DBPs的生成潜能，并使细胞毒性大幅升高。
- Abstract:
-
Water samples from different drinking water treatment processes were treated by chlorination and chloramination respectively, and the effects of different drinking water treatment processes on disinfection by- products (DBPs) formation potential belonging to 7 classes and 18 species were analyzed. The DBPs included carbonaceous DBPs such as trihalomethanes (THMs), haloacetic acids (HAAs), haloketones (HKs) and chloral hydrate (CH), and nitrogenous DBPs［such as haloacetonitriles (HANs), trichloronitromethane (TCNM) and total N-nitrosamines (TONO)］.The formation potential of many halogenated DBPs could be effectively reduced by coagulation/sedimentation and filtration process, whereas activated carbon process greatly increased the formation potential of TONO. Coagulation and sand filtration processes were more effective in removing precursor of carbonaceous DBPs, while oxidation process was more beneficial to remove precursor of nitrogenous DBPs. The cytotoxicity mainly originated from HANs and HAAs,and its changing trend was roughly consistent with the formation potential of HANs and HAAs. The increase of Br- concentration in water significantly increased the formation of brominated DBPs and greatly increased the cytotoxicity.
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