义乌市畜禽养殖粪便污染风险评价

Pollution Risk Evaluation of Livestock and Poultry Excrement in Yiwu City

为了了解和掌握义乌市畜禽养殖业现状及其污染情况,提出相应的污染防治措施及办法。通过义乌市畜禽养殖业污染源的普查,根据国内畜禽粪尿产排污系数估算了义乌市2007年主要畜禽粪便排放总量及其氮、磷养分含量。结果表明:2007年义乌市主要畜禽粪便排放总量为16.6万t,尿排放总量为48.5万t,折算成总氮0.18万t,总磷348.59t,COD3.16万t,铜1.10万t,锌2.07万t。不同畜禽中,猪的畜禽排放量最高,占义乌市排放总量的78.3%;尿的排放总量构成中,生猪的排放量最高,占总量的99.8%。不同镇街中以义亭镇的畜禽粪便排放总量最高,占全市排放总量的39.4%。

To investigate the status and pollution situation of livestock and poultry breeding industry in Yiwu City and put forward the corresponding measures, annual total excrement from main livestock-poultry and Nitrogen, Phosphorus content in which were evaluated based on the agricuhural pollution census data and poultry waste emission coefficient in urine. The study showed that, gross livestock-poultry excrement in 2007 comprises of 16.6 × 10^4 tons of feces and 48.5 × 10^4 tons of urine. The total livestock-poultry excrement contained 0.18× 10^4 tons total N, 348.59 tons total P, 3.16× 10^4 tons COD, 1.10× 10^4 tons Cu, and 2.07× 10^4 tons Zn. Among the main livestock-poultry, pigs excreted the highest amount of feces, accounting for 78.3% of the total excrement; the livestock-poultry urine was also produced by pigs, accounting for 99.8%. The highest amount of livestock-poultry excrement came from Yiting town, accounting for 39.4%.