污水处理工艺中雌激素活性的分布与去除研究

Research on Estrogenicity Distribution and Cleanup during Sewage Treatment Process

文章探讨了某城市污水处理厂不同处理工艺流程中污水雌激素活性的分布情况及去除效果。利用固相萃取/重组基因酵母法测定污水样品雌激素活性的分布,计算污水处理厂雌激素活性的去除效率。结果表明污水水样中均存在一定的雌激素活性,总进水口、初沉池、二沉池和出水口水样的雌二醇当量浓度分别为(11.03±0.16)、(9.62±0.61)、(1.11±0.08)、(1.04±0.30)ng/L。该厂Ⅰ、Ⅳ、Ⅵ系列对雌激素活性的去除率分别为76.87%、92.43%、87.59%,总去除率达到88.78%。Ⅳ、Ⅵ系列的去除效率基本相同,且都高于Ⅰ系列。二级生物处理对雌激素活性的去除起主导作用。该污水处理厂对雌激素活性的去除效率较高,但处理后污水的大量排放对受纳水体具有一定的潜在环境风险。

The aim of this study was to explore the distribution and cleanup-rate of estrogenicity during different treatment processes and units of sewage treatment plant. A solid phase extraction/yeast two-hybrid system was used to evaluate estrogenicity of sewage samples and calculate the cleanup-rate of estrogenicity. The results showed that a degree of estrogenicity was detected in all samples. The biological estradiol equivalents in the raw sewage, effluent of primary sedimentation, secondary sedimentation tank and outlet were（11.03±0.16）,（9.62±0.61）,（1.11±0.08）,（1.04±0.30）ng/L respectively. The cleanup-rate of unit Ⅰ, unit Ⅳ and unit Ⅵ in the sewage treatment plant were 76.87%, 92.43%, 87.59%respectively and the total cleanup-rate was 88.78%. The cleanup-rate of unit Ⅳ and unit Ⅵ were equal and they were higher than unit Ⅰ. The secondary biotreatment process played a dominant role in the removal of estrogenicity. The estrogenicity could be eliminated obviously by the sewage treatment plant, however it still had a certain potential environment risks to the receiving water.