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目的评价再生水回用于公园绿化和道路压尘时,再生水中三卤甲烷(THMs)的致癌危险度。方法:于2003—2004年调查北京市再生水经氯化消毒后回用于道路压尘和公园绿化时三卤甲烷的浓度水平,分别对接触再生水的职业人群(道路压尘清洁车司机和绿化园丁)和非职业人群(道路压尘工作现场10 855人次,公园再生水浇灌区游客约113 109人次)接触再生水的方式及暴露水平进行调查分析,用健康危险度评价的方法评价THMs对不同人群的健康影响和致癌危险度。结果再生水中氯仿、一溴二氯甲烷、二溴一氯甲烷、三溴甲烷的浓度分别为0.875～108、0.06～11.0、未检出～5.82、未检出～3.04μg/L。再生水回用于道路压尘、公园绿化,人群通过吸入和皮肤两种途径暴露于再生水,吸入暴露为主要途径,其消毒副产物THMs中,主要化合物为氯仿、一溴二氯甲烷,其次为二溴一氯甲烷和三溴甲烷。结论本次调查的再生水三卤甲烷对职业人群和非职业人群的致癌危险度均小于10-5,低于USEPA可接受水平。
Objective To evaluate the carcinogenic risk of THMs in reclaimed water when reclaimed water is recycled for park greening and road dusting. Methods: From 2003 to 2004, the concentrations of trihalomethanes in Beijing’s reclaimed water after being disinfected by chlorination were measured for road dust and park greening. Occupational exposure to reclaimed water (road dust cleaner drivers and greening gardeners) ) And non-occupational groups (10 855 people working on road dust and 113 113 109 tourists in the reclaimed water irrigation area) were investigated and analyzed. The health risk assessment was used to evaluate the health effects of THMs in different populations Impact and carcinogenic risk. Results The concentrations of chloroform, bromodichloromethane, dibromochloromethane and tribromomethane in the reclaimed water were 0.875-108.0.06-11.0, respectively, but ~ 5.82 were not detected, and ~ 3.04 μg / L was not detected. Reclaimed water is mainly used for road dusting and park greening. The population is exposed to reclaimed water by inhalation and skin, and inhalation is the main route. The major chemical compounds of THMs, which are disinfection by-products, are chloroform and bromodichloromethane, followed by two Bromochloromethane and tribromomethane. Conclusion The carcinogenic risk of trihalomethanes in reclaimed water in this survey to both occupational and non-occupational groups is less than 10-5, which is lower than the acceptable level of USEPA.