珠三角城市污泥中壬基酚及重金属特征分析

对珠三角地区典型城市的13家污水处理厂剩余污泥中壬基酚(Nonylphenol,NP)、部分重金属及养分含量进行了检测和分析.结果表明,珠三角地区典型城市13家污水处理厂污泥中NP范围在0.45~65.17 mg·kg~(-1)(以干重计,下同)之间,平均值为10.87 mg·kg~(-1),工业废水是影响污水处理厂污泥中NP含量的一个重要因素,该地区污泥中NP含量相比于世界其他地区较低,但其中有2家污水处理厂污泥中NP含量超过或接近2000年欧盟污泥指令文件对污泥中NP、NP1EO、NP2EO(NPE)总量限制值(50 mg·kg~(-1)).13家污水处理厂污泥样中Cu、Pb、Cd及Zn含量的几何平均值分别为435.43、78.88、2.72、1088.01 mg·kg~(-1),与《城镇污水处理厂污染物排放标准》(GB18918—2002)中施用土壤(p H6.5)限值进行比较,仍有部分污水处理厂污泥中Cu、Cd、Zn含量超标.13家污水处理厂污泥样中有机质、总氮、总磷及总钾的算术平均值分别为294.40、12.92、39.63、9.12 g·kg~(-1),与过去的研究相比,污泥中有机质与养分含量总体呈上升趋势.相关性分析的结果表明,13家污水处理厂污泥样中NP含量与污泥中总Cu的含量具有显著的正相关关系.

Residual nonylphenol and heavy metals in sewage sludge from wastewater treatment plants in Pearl River Delta region

The concentrations of nonylphenol (NP), heavy metals, and nutrients in sewage sludge from 13 wastewater treatment plants in the Pearl River Delta region were evaluated. The concentrations of NP in sewage sludge from different wastewater treatment plants in the Pearl River Delta region were in the ranges of 0.45~65.17 mg·kg^-1 dry weight (the same below), with mean value of 10.87 mg·kg^-1. Industrial wastewater is an important factor affecting the NP concentration in the sludge of wastewater treatment plant. Compared with other regions of the world, the concentrations of NP in this study was at a lower level. The concentrations of NP in two wastewater treatment plants were higher than or close to the limit value (50 mg·kg^-1) for the sum of NP, NP₁EO, and NP₂EO (NPE) concentrations, which was set by the European Union Sludge Directive draft published in April 2000. The geometrical mean values of Cu, Pb, Cd, and Zn were 435.43, 78.88, 2.72, and 1088.01 mg·kg^-1, respectively. A few samples exceeded the limits set by ''discharge standard of pollutants for municipal wastewater treatment plant'' of China (GB18918-2002) for Cu, Pb and Zn in alkaline soils. Meanwhile, the average concentrations of organic matter, TN, TP and TK were 294.40, 12.92, 39.63, and 9.12 g·kg^-1, respectively, which displayed the trend of increased average concentrations of organic matter and nutrient in the sludge. Statistical analysis results show significant positive correlation between the concentrations of NP and the concentrations of Cu in sewage sludge.