城市污水处理过程中壬基酚的迁移转化途径研究

Study on Translation and Conversion Behavior of Nonylphenol in Municipal Wastewater Treatment

采用GC-MS法对北京市某污水处理厂各处理单元的壬基酚(NP)分布状况进行了检测,探讨了城市污水处理过程中壬基酚的迁移转化途径。结果表明,城市污水处理厂进水NP平均浓度为19.26μg/L,出水NP平均浓度为4.57μg/L。由于泥区回流液中NP浓度较高,导致NP浓度随水处理流程有先升高后降低的趋势,沉砂池出水NP浓度最高,为进水浓度的1.5倍。在污水处理流程中,除原水外,泥区回流液是NP的一个重要来源;NP的迁出与去除途径包括:初沉池生污泥和二沉池活性污泥的吸附作用,曝气池内的生物降解作用以及随处理出水的排放。

The distribution of nonylpheoel （NP） in the different treatment units of a wastewater treatment plant in Beijing was determined by GC-MS method. The translation and conversion of NP in the municipal wastewater treatment course were discussed. The results show that the average NP concentrations in the influent and effluent of the plant are 19.26μg/L and 4.57 μg/L respectively. Because of the high NP concentration in the reflux liquid from the sludge treatment area, NP concentration in the front of primary sedimentation tank is increased by about 50 percent of the influent. The effluent from the aerated grit chamber has the highest concentration of NP, 1.5 times of the influent. The entry ways of NP are both the sewage and reflux liquid from the sludge collection and disposal unit. The NP transference ways and removal routes from wastewater treatment system include the adsorption by the primary sedimentation sludge and the activated sludge of secondary sedimentation tank, the biodegradation in aerated tank, and the discharge with the effluent.