曝气吹脱及气洗炭池对水厂三氯甲烷的控制  

Control of Trichloromethane in WTPs by Aerated Stripping and Gas Backwash Bioactivated Carbon Filter

作　　者：齐天天 张静 温颖 张晓岚 柴文 顾军农 QI Tiantian;ZHANG Jing;WEN Ying;ZHANG Xiaolan;CHAI Wen;GU Junnong(Technology Institute of Beijing Waterworks Group Co.,Ltd.,Beijing 100012,China)

机构地区：[1]北京市自来水集团有限责任公司技术研究院,北京100012

出　　处：《净水技术》2023年第11期76-81,135,共7页Water Purification Technology

基　　金：国家重点研发计划(2021YFC3200904)。

摘　　要：预氧化是水厂水处理工艺中产生消毒副产物最多的阶段,其中消毒副产物以三氯甲烷为主,且难以被常规工艺及生物活性炭池等深度处理工艺去除。本研究通过在活性炭池前曝气和优化炭池反冲洗方式,对炭池出水三氯甲烷浓度进行控制。结果表明,气水比为10∶1的条件下曝气出水三氯甲烷质量浓度显著降低至10μg/L以下。同时,与水洗反洗相比,气洗+气水联合反洗方式可有效洗脱活性炭上吸附的三氯甲烷,减少三氯甲烷的解吸。曝气+炭池气水联合反冲洗既可同时控制三氯甲烷及其前体物浓度,还能抑制藻类滋生,具有较好的应用前景。Pre-oxidation is the stage of water treatment process in water treatment plants that generates the most disinfection byproducts,among which disinfection by-products are mainly trichloromethane,and it is difficult to be removed by conventional processes and deep treatment processes such as bioactivated carbon filter(BACF).In this study,the trichloromethane concentration in BACF effluent was controlled by aeration before BACF and optimization of BACF backwashing method.The results showed that the aeration effluent trichloromethane concentration was significantly reduced to below 10μg/L under the condition of 10∶1 gas-to-water ratio.At the same time,compared with water backwashing,the combined gas-wash+gas-water backwashing method can effectively elute the adsorbed trichloromethane on the activated carbon and reduce the desorption of trichloromethane.The combined aeration+BACF gaswater backwashing can control the concentration of trichloromethane and its precursors at the same time,and also inhibit algal growth,which has a good application prospect.

关 键 词：水厂 曝气吹脱 三氯甲烷 活性炭池 气洗反冲洗 

分 类 号：TU991[建筑科学—市政工程]