桂林市城区主要污染物入河量估算

目的]估算桂林市城区主要污染物入河量。方法]根据用水量对桂林市城区城镇污染源包括生活源、工业源、规模化畜禽养殖源和农业面源(COD和NH3-N)的入河量进行了估算。结果]城镇生活源和工业源是桂林市城区主要污染物入河量的主要来源;城镇生活源和工业源贡献比例分别为27.6%~31.4%和58.7%~59.7%;桂林市区和其他区县贡献比例分别为35.6%~37.1%和62.9%~64.4%;桂江流域贡献比例最大,为66.8%~68.3%,其次是柳江下游,比例为25.7%~26.8%。结论]经估算,桂林市城区污染源的COD和NH3-N入河量分别为24 952.57和3 276.31 t/a。

Estimation of Major Pollutants into River in Urban Area of Guilin City

Objective] The aim was to estimate the quantity of major pollutants into river in urban area of Guilin City.Method]According to water consumption, the quantity of COD and NH 3-N from urban pollution sources including living source , industrial source,large-scale live-stock and poultry breeding source and agricultural surface source into river in urban area of Guilin City were estimated . Result]The results showed that:urban living and industrial sources are the main sources of the major pollutants into river in the research area ;the contribution ra-tios of urban living and industrial sources are 27.6%-31.4%and 58.7%-59.7%, respectively;the contribution ratios of inner-city and its suburbs are 35.6%-37.1% and 62.9%-64.4%, respectively; the largest contribution ratio is from Guijiang river basin with 66.8% -68.3%; and the second contribution ratio is from the lower reaches of Liujiang river basin with 25.7%-26.8%.Conclusion] The quantity of COD and NH3-N into river from urban area of Guilin City is estimated as 24 952.57 and 3 2763.1 t/a, respectively.