Removal efficiency of steroid estrogens in four different wastewater treatment plants (WWTPs) with advanced treatment processes was studied using gas chromatography-mass spectrometry. The results show that all of the five estrogens are detected in the four WWTPs, and the concentrations of estrone, 17βestradiol and estriol are from 15.1 to 607.0 ng/L, which is higher than that of foreign countries. The average removal rate of estrone, estriol and ethinyl estradiol is 88.1%-97.3%, which is higher than that in tranditional WWTPs. The biological treatment process is dominant for the removal of estrogens and the removal effect of estrogens is better in activated sludge system than that in biological membrane system. Sedimentation pretreatment and advanced treatment processes of coagulation, sedimentation and filtration are not good for the removal of steroids, with average revomal rate of 10%-20%. Steroid estrogens can not be removed completely in the 4 WWTPs, which results in the high residues of estrogens in both effluent and discharged sludge.%采用气相色谱-质谱技术,研究甾体雌激素在4座具有深度处理工艺的污水厂中的去除效果.研究结果表明:4座污水厂的进水中均检出甾体雌激素,雌酮、17β雌二醇和雌三醇的质量浓度为15.1~607.0 ng/L,高于国外污水厂进水中雌激素的平均质量浓度.污水厂对雌酮、雌三醇和乙炔基雌二醇平均去除率为88.1%~97.3%,优于传统的污水处理工艺;生物处理工艺段对甾体雌激素的去除占主导地位,且活性污泥系统对雌激素的去除效果优于生物膜系统.沉淀预处理和混凝沉淀+过滤深度处理工艺段对甾体雌激素的去除效果不佳,平均去除率为10%~20%.4座污水厂均不能彻底去除污水中的甾体雌激素,污水厂尾水及剩余污泥中残留较高质量浓度雌激素.
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