壬基酚聚氧乙烯醚在污水处理过程中的迁移转化行为

用正相色谱－质谱联用法（NPLC－MS）分离分析高聚合度的NPnEO(n＞2）,用气相色谱－质谱联用方法（GC－MS）测定其中的NP,NP1EO和NP2EO浓度,对NPnEO在城市污水处理厂的迁移转化行为进行了研究。在污水处理厂的进水中,检测出NP和NPnEO(n=1-23）,总浓度为174nmol/L,其中NP2EO的浓度最高,为89．6nmol/L;其次分别为NP（42．2nmol/L）和NP1EO（12．2nmol/L）;出水中同样检测出NP和NPnEO(n=1-18),其中NP2EO的浓度最高,为37．2nmol/L;其次分别为NP（6．64nmol/L）和NP1EO（0．135nmol/L)。在城市污水处理过程中,NPnEO从高聚合度降妥成低聚合度,NP和NPnEO的总去降率为71％。另外,NP和NPnEO在污泥及污泥过滤水中的分配表明污泥对NPnEO有明显的吸附作用,并近似符合Dubinin-Astakhov等温吸附。

The transformation of nonylphenol ethoxylates in sewage treatment

The concentrations of individual NPnEO (n > 2) were separated and analyzed by normal phase liquid chromatograph-mass spectrometry (NPLC-MS), and those of NP, NP1EO and NP2EO were determined by GC-MS. NP and NPnEO (n = 1-23) were found in the influent water, and the concentration of total NPnEO was 174 nmol/L. Of NPnEO, the abundance of NP2EO (89.6 nmol/L) was the highest, and next was NP (42.2 nmol/L) followed by NP1EO (12.2 nmol/L). 71% NP and NPnEO were removed by sewage treatment process and the adsorption on sludge contributed to the removal for these compounds. It was found that the adsorption of NPnEO on sludge followed the Dubinin-Astakhov model, assuming each NPEO were with similar adsorption potential.