贵阳市污水处理厂中典型抗生素的污染水平及生态风险

为了解贵阳市污水处理厂对进水中典型抗生素的去除情况及污水处理厂出水对受纳水体中水生生物的影响,对贵阳市两座污水处理厂进出水及受纳水体中9种典型抗生素进行调查.结果表明,污水处理厂进出水中抗生素均有不同程度检出,进出水中抗生素的浓度范围在ND～835. 60 ng·L~(-1)和ND～286. 60 ng·L~(-1)之间,其中氧氟沙星(OFX)浓度最高,进水分别为835. 60 ng·L~(-1)和539. 00 ng·L~(-1),出水分别为11. 74 ng·L~(-1)和286. 60 ng·L~(-1).污水处理厂对抗生素的去除率为-42. 29%～100%,其中四环素(TC)被完全去除.进出水中抗生素的浓度与国内外其它地区污水处理厂相比处于较低水平.通过对受纳水体中抗生素的检测分析发现,受纳水体中OFX的浓度最高,污水处理厂出水是受纳水体中抗生素的来源之一.通过生态风险评估也发现OFX对受纳水体中水生生物存在高风险(RQ 1).

Pollution Level and Ecological Risk of Typical Antibiotics in Guiyang Wastewater Treatment Plants

To determine the removal efficiency of typical antibiotics in Guiyang wastewater treatment plants (WWTPs) and the impact of effluent on aquatic organisms in receiving waters, nine antibiotics in the influent, effluent, and receiving water of two WWTPs in Guiyang City were investigated. The concentrations of antibiotics in the influent and effluent ranged from 0 to 835.60 ng·L^-1 and 0 to 286.60 ng·L^-1, respectively, and the concentration of ofloxacin (OFX) was highest. Its concentration in the influent was 835.60 ng·L^-1 and 539.00 ng·L^-1 and in the effluent was 11.74 ng·L^-1 and 286.60 ng·L^-1, respectively. The removal rate of antibiotics in the WWTPs ranged from -42.29% to 100%, and tetracycline (TC) was completely removed. The concentrations of antibiotics in the influent and effluent of the WWTPs in Guiyang City was less than in other regions of China and in other counties. Through the analysis of the antibiotics in the receiving waters, it was found that the concentrations of OFX were higher than other antibiotics, and the WWTPs effluent was one source of antibiotics in the receiving waters. OFX showed a high risk (RQ>1) for aquatic organisms in the receiving waters, as determined by an ecological risk assessment.