江苏省城市污水处理厂尾水时空排放特征研究

TEMPORAL AND SPATIAL CHARACTERISTICS OF TAIL WATER FROM WASTEWATER TREATMENT PLANTS IN JIANGSU PROVINCE

城市污水处理厂排放的尾水浓度即使达到一级A标准,相对于地表水环境质量标准限值依然过高,对江河湖泊等地表水环境仍会产生一定的影响。以江苏省污水处理厂监督性监测结果为对象,采用聚类分析的方法,从时间和空间两个维度来探讨污水处理厂尾水排放特征及其影响。对不同季度、不同地区污水处理厂尾水中氨氮、总磷、COD的数据分析发现,夏季尾水中平均出水浓度指数较其他季节明显偏高,苏南较苏北、苏中的平均出水浓度指数低。针对污水处理厂尾水问题,介绍了人工湿地深度处理技术,可为日益增长的尾水排放量与有限的水环境容量之间的矛盾提供解决途径。

Even the polutants in tail water from waste water treatment facilities meets the level A standard,its concentration is still higher than the surface water quality standards,which will do harm to the surface water environment of rivers and lakes.Based on the data from the monitoring results of wastewater facilities in Jiangsu Province,it was discussed the characteristic and influence of the treated water in temporal and spatial dimensions,using cluster analysis method.The results show that the concentrations of ammonia nitrogen,total nitrogen and COD,in summer are higher than the other seasons,and in the southern part of Jiangsu are lower than that of the northern and middle parts.It was also introduced a advanced treatment technology,man-made wetland,which would give some advice to solve the contradiction between urban development and limited water capacity.