江苏太湖地区水污染物及其向水体的排放量

Pollutants Sources and Their Discharging Amount in Taihu Lake Area of Jiangsu Province

1997年各污染源累计向江苏太湖地区水体排放 TN 6 4 82 4 t,各污染源中 TN所占份额的高低顺序为 :农田 2 4 %、工业 2 2 %、人粪尿 18%、畜禽粪尿 16 %、生活污水 14%、精养鱼塘6 % .种植业、畜牧业、渔业累计占 4 6 % ,农业生产对水体的氮素污染较重 .CODCr排放量的高低顺序为生活污水 89385t、人粪尿 74 551t、畜禽粪尿 16 82 0 t、精养鱼塘 2 758.5t;TP为畜禽粪尿 72 4 1t、生活污水 2 2 39t、人粪尿 196 9t、精养鱼塘 4 0 7.3t.等标污染负荷分析结果表明 :畜禽粪尿、生活污水、人粪尿、精养鱼塘四种污染源对水体的污染均表现为 TP最重、TN次之、CODCr最轻 .

Total nitrogen discharged from different sources in Taihu Lake area of Jiangsu province in 1997 is estimated as 64824t. Proportion of total nitrogen discharged into Taihu Lake area water system of Jiangsu Province from different sources in this area is 24% from farmland, 22% from industry, 18% from human manure and urine, 16% from animal & poultry manure and urine, 14% from life waste water, and 6% from carefully rasied fish pond. Nitrogen amount discharged from field, animal husbandry and fishery targets 46% of total nitrogen into the water, which shows that nitrogen pollution from agriculture production is serious. Proportions of COD Cr discharge from different sources are shown in detail: 89385 t·a -1 from life waste water, 74551 t·a -1 from human manure and urine, 16820 t·a -1 from animal & poultry manure and urine, 2758.5t·a -1 from carefully raised fish pond and TP (total phosphorus) is 7241 t·a -1 from animal & poultry manure and urine, 2239t·a -1 from life waste water, 1969t·a -1 from human manure and urine, 407.3t·a -1 from carefully raised fish pond. Results of equivalent standard polluting load analysis show that the cosequence of worsening water quality is resulted from TP, TN and COD Cr in life waste water, human manure and urine, animal & poultry manure and urine and carefully raised fish pond.