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选择我国饮用水水质标准中有相关规定,以及部分用量较大或虽被禁用但仍有残留的农药共25种,对黄浦江水源水以及采用臭氧活性炭-后置砂滤工艺的某水厂工艺段出水中的浓度分布进行了调查,评估了砂滤后置工艺条件下相应农药的实际处理效果。结果表明:原水中有包括莠去津、乐果、六氯苯、敌敌畏、乙草胺、丁草胺、仲丁威和p,p’-DDT的8种农药检出,且总浓度较高达到760 ng/L,其中莠去津和乙草胺含量较高,最高浓度分别达到531 ng/L和277 ng/L;从季节性分布来看,春季总农药浓度最高达760 ng/L,秋季最低为175 ng/L。从工艺去除效果来看,臭氧活性炭砂滤后置工艺对农药的总体去除率为62%~78%,与冬春季相比,夏秋季节的农药的去除率提高约10%左右,这可能与高温期微生物活性较高有关。值得关注的是,砂滤后置工艺与同期常规臭氧活性炭工艺相比农药的总去除率要低10%左右,应结合总体出水水质情况对其进一步评估。
Select China’s drinking water quality standards in the relevant provisions, as well as some of the larger amount or banned but there are still a total of 25 kinds of pesticides remaining, the Huangpu River water source and the use of ozone activated carbon - after a sand filtration process water plant technology Section of the effluent concentration was investigated to assess the actual treatment effect of the corresponding pesticides after sand filtration and post-processing conditions. The results showed that eight pesticides including atrazine, dimethoate, hexachlorobenzene, dichlorvos, acetochlor, butachlor, sec-butyl and p, p’-DDT were detected in the raw water and the total concentration was higher Reaching 760 ng / L, of which atrazine and acetochlor were the highest concentrations of 531 ng / L and 277 ng / L, respectively. According to the seasonal distribution, total pesticide concentration in spring was up to 760 ng / L, The lowest in autumn is 175 ng / L. From the process of removal effect, the overall removal rate of ozone activated carbon sand filtration process for pesticides was 62% to 78%, compared with winter and spring, summer and autumn pesticide removal rate increased by about 10%, which may be high temperature Period of microbial activity is higher. It is noteworthy that, compared with conventional ozone activated carbon process, the total removal rate of pesticide is about 10% lower after sand filtration and post-treatment process, and should be further evaluated based on the overall effluent quality.