根据2007年第1次全国污染源普查结果，利用淳安县205家企业的产值、废水排放、化学需氧量（chemical oxygen demand，COD）和氨氮排放量（NH₃-N），核算不同行业万元产值排污系数；并采用33家重点企业2012年的排污数据进行验证。结果表明，在33类细分行业中，豆制品制造业万元产值废水（257.090 8 t）、COD（473.548 4 kg）和NH₃-N （6.1719 kg）排放均最大；棉、化纤纺织加工业万元产值废水（0.000 6 t）、COD（0.003 2 kg） 和NH₃-N（0.000 0 kg）排放均最低。丝绢纺织及精加工、碳酸饮料制造和食用植物油加工业的万元产值NH₃-N排放量也为0.000 0 kg。排污系数验证显示，啤酒制造、果菜汁及果菜汁饮料制造和豆制品制造业的万元产值排污系数误差较大，预测值均高于实测值；其他行业万元产值排污系数误差较小，多为预测值略低于实测值。

Based on the output values and pollution discharge data (wastewater, chemical oxygen demand,and NH₃-N) of 205 enterprises in Chun'an county in China obtained from the first national pollution source census of 2007, the discharge coefficients of pollutant over products of 10 000 yuan for different industrial categories in Chun'an county were calculated.Moreover, output values and pollution discharge data of 33 enterprises in 2012 were used to validate calculation results.The results showed that the soy products manufacturing was the highest pollution discharge industry and the draining wastewater, COD,and NH₃-N were up to 257.090 8 t, 473.548 4 kg, and 6.171 9 kg,respectively, whereas the discharge coefficients were the lowest for the cotton and chemical fiber textile industry (0.000 6 t, 0.003 2 kg, and 0.000 0 kg, respectively).Additionally, the discharge coefficient of NH₃-N over products of 10 000 yuan was 0.000 0 kg for the silk spinning and finishing, carbonated beverage manufacturing,and edible vegetable oil processing.Validation results showed that the prediction errors in the discharge coefficients were marked in beer manufacturing, fruit juice beverage manufacturing,and soy products manufacturing, and the predicted values were larger than the measured values.However, the predicted values well matched the measured values in the other industries, and the predicted values were all slightly smaller than the measured values.