三峡库区湖北段城镇生活源污染负荷现状与预测

Pollution Loading Evaluation from Urban Life Source and Its Forecast in the Hubei Region of Three Gorges Reservoir Area

针对三峡库区生活源污染负荷大,对库区水生态环境安全危害大等特点,以库区湖北段生活源污染负荷计算及预测为对象,分析了1995~2007年污水量和主要污染物COD、BOD5、氨氮、TN、TP的排放量,并采用灰色模型预测各区县人口数量,结合排污系数法估算2008~2020年生活源污染负荷量。结果表明,城镇生活污水量在2001年出现显著的增长,之后缓慢增长,截至2007年底城镇生活污水排放量达到2 174.73万t,而其中主要污染物COD、BOD5、氨氮、TN和TP均呈现出上升的趋势。预测结果为生活源污染负荷削减和库区水质保护提供参考。

The pollutions from life source are more and more critical for water ecological environment security of the Three Gorges Reservoir Area.In this paper,the pollution loading from urban life source in the Hubei region of Three Gorges Reservoir Area has been investigated,the amount of sewage and the main pollutants,COD,BOD5,NH3-N,TN,TP,have been calculated from 1995 to 2007.By using Grey Model,the population of each area in Hubei region of Three Gorges Reservoir Area are predicted along with the emission coefficient method to estimate the quantity of urban life pollution loading from 2008 to 2020 to provide advices for local environmental protection department to reduce pollution from life source and protect water resource.The results of investigative study indicate that the amount of urban sewage grow slowly again after dramatical increase in 2001.By the end of 2007,the amount of urban sewage has reached 21 747.3 kiloton.The main pollutants of sewage like COD,NH3-N,TN,TP and BOD5 all present rising trends.