摘要
测定了中国北方4个城市污水处理厂进、出水中壬基酚聚氧乙烯醚（NPnEO，n为聚合度）及其代谢产物的浓度及分布，同时测定了其中2个污水处理厂污泥中上述物质的浓度和分布，初步探讨了NPnEO在城市污水处理过程中的迁移转化行为．结果表明：在4个城市污水处理厂的进、出水及其中2个厂的污泥中均检测到了浓度不等的NPnEO及其代谢产物；NPnEO在各城市污水处理厂都得到了一定程度的降解去除，去除率为23．38％～77．11％，平均为52．86％；NPnEO大分子组分降解成了小分子组分，但并未完全矿化；出水中以壬基酚（NP）、壬基酚一乙氧基醚（NP1EO）和壬基酚二乙氧基醚（NP2EO）小分子组分的浓度高．这些小分子产物都具有比母体化合物更高的毒性，并具有环境内分泌干扰性质，因此污水处理过程不但没有降低反而增加了生态风险，是环境中小分子NPnEO的主要来源；污泥对NPnEO，特别是小分子代谢产物有良好的吸附性能，其在污泥中的浓度水平较高，合理处置污泥避免二次污染值得进一步研究探讨．
The concentrations and distributions of nonylphenol polyethoxylates （NPnEO） and its metabolites were determined in the influents and effluents from sewage treatment plants （STPs） of four different cities in the north of China, and their concentration and distribution in the sludge from two of the STPs were also measured. Moreover, the,transfer and transformation of NPnEO and its metabolites in the sewage treatment process was discussed primarily. NPnEO and its metabolites were found in all the tested samples, including the influents, effluents and sludges. NPnEO were removed to some extent in the four STPs, with the removing efficiencies ranging 23.38%～77.11% and the average efficiency being 52.86 %. Large NPnEO molecules with longer ethylene oxide （EO） chain were biodegraded efficiently, however not mineralized to CO2 but to middle metabolites, such as small NPnEO with short EO chain or nonylphenol （NP）. Hence, the concentrations of NP and NP1EO and NP2EO are high in the effluents. These. metabolites are of higher toxicity than their parent compounds, and exhibit endocrine disrupting activity. Hence, the process of wastewater treatment does not lead to a reduced risk but lead to an elevated risk, becoming the main source of these small NPnEO metabolites in the environment. The sludge had good capacity of adsorption of NPnEO, especially its metabolites, and the concentration of NPnEO in the sludges was high. Suitable treatment of sludges is worth further studying so as to avoid re-pollution.
出处
《环境科学研究》
EI
CAS
CSCD
北大核心
2006年第3期61-66,共6页
Research of Environmental Sciences
基金
国家自然科学基金资助项目(20277022)
作者简介
侯绍刚（1971-），男，河南安阳人，博士．
通讯联系人
