Abstract:

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.

Key words: discharge coefficient of pollutant over products of 10 000 yuan, industrial source pollution, Chun'an county