Health risk assessment of disinfection by-products in urban drinking water of a district,Shandong Province from 2018 to 2022
Objective To understand the content of disinfection by-products in urban drinking water of a district,Shandong Province,and to evaluate their health risk.Methods From 2018 to 2022,a total of 90 water samples of urban drinking wa-ter were collected from a district of Shandong Province during dry and abundant water periods,respectively.Disinfection by-products were tested according to GB/T 5750.10-2006 Standard examination method for drinking water-Disinfection by-products parameters.Evaluate in GB 5749-2006 Standards for drinleing water guality the health risk model recommended by the US Environmental Protection Agency was used for risk evaluation.Results The qualified rate of disinfection byprod-ucts was 76.67％in a district of Shandong Province from 2018 to 2022.The exceeding indicators were trihalomethanes and trichloroacetaldehyde,with exceeding rates of 23.33％and 4.44％,respectively.Except for cyanogen chloride,methylene chloride and 2,4,6-trichlorophenol,which were not detected,all other disinfection by-product indicators were detected to va-rying degrees.The contents of trihalomethane,trichloromethane and bromodichloromethane were higher in the abundant wa-ter period than those in the dry water period(P＜0.05).There was no statistical significance in the contents of disinfection by-products between the effluent water and the final water(P＞0.05).The carcinogenic risk of by-products of drinking wa-ter disinfection in this area is in the range of 1.0×10-6-1.0×10-4.The carcinogenic risk of chlorodi bromomethane and di-chloroacetic acid at individual monitoring sites was＞1.0× 10-4.The non-carcinogenic risk of each disinfection by-product was＜1.0.Conclusion The non-carcinogenic risk of disinfection by-products of urban drinking water in a district of Shan-dong Province is within the acceptable range.However,the carcinogenic risk should be given high priority,especially dichlo-rodibromomethane and dichloroacetic acid are the key risk management indicators.
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