基于盲数理论的四川省西充河水环境容量研究

Study of Water Environment Capacity of Xichong River in Sichuan Province Based on Blind Number Theory

嘉陵江一级支流西充河为四川省严重污染河流。经监测分析,2009年西充河水质被评为劣5类,主要污染物包括氨氮、化学需氧量、总氮、总磷、粪大肠菌群等。以西充河南充市段为研究对象,运用盲数理论测算,对比了西充河雷打石和拉拉渡2个断面2003—2009年的水质监测资料。2个断面的水环境容量值CODCr为637.01kg/d,NH3—N为0.76kg/d。2断面间的化学需氧量、氨氮超过水环境容量值(WCODCr=874.59kg/d,WNH3—N=116.34kg/d)分别是允许水环境容量的1.37和153倍。为了达到国家3级水质标准,西充河的治理已经刻不容缓。

Xichong River in Sichuan Province,a tributary of Jialing River,has been polluted seriously.In 2009,water quality of Xichong River was assessed to be the bad fifth grade through monitoring and analysis.The main contaminants in the river are ammonia nitrogen,chemical oxygen demand,total nitrogen,total phosphorus,and fecal coliform.By taking the Nanchong segment of Xichong River as the research object,the data from water quality monitoring at Leidashi and Laladu observation sites from 2003 to 2009 are analyzed based on blind number theory.As for the water environment capacity at the two sites,CODCr is found to be 637.01 kg/d and NH3—N,0.76 kg/d.Chemical oxygen demand（WCODCr） and ammonia nitrogen（WNH3—N） exceeding the standards at the two sites are 874.59 and 116.34 kg/d,being 1.37 times and 153 times of the allowed value,respectively.In order to reach the third grade of national water quality standards,it is urgent to control the pollution of Xichong River.