Pollutant generation coefficient and discharge coefficient in animal production

Pollutant generation and discharge coefficients in animal production are the key parameters for animal environment engineering research and animal waste treatment projects. There were no authoritative pollutant generation and discharge coefficients available in China because the research about animal husbandry environmental engineering started late. Based on the characteristics of China's animal industry, generation and discharge coefficients of pollutants definitions, calculation methods, application scope and application of methods were discussed combined with typical cases analysis. Under the application of a typical pig farm in Beijing, three stage (nursery, fattening and gestation) generation coefficient for one pig were calculated, which were 252.8, 479.6, 493.4 g/d for COD, 20.4, 33.2, 43.7 g/d for TN, 3.48、6.06、9.93 g/d for TP, respectively. Under the pig waste treatment system operation condition, three stage discharge coefficients were calculated, these were 44.9, 64.1, 22.5 g/d for COD, 14.1, 20.9, 36.3 g/d for TN, 1.0, 1.8, 0.4 g/d for TP, respectively. The results can provide a reference for the pollution source census, animal waste treatment system operation.