太湖典型地区工矿企业废水中主要污染物排放特征研究——以江苏溧阳市为例

在调查了江苏省溧阳市化工、纺织等18家典型工矿企业废水中TN、TP、 CODMn等主要污染物质排放强度及特征基础上,估算了溧阳市工业行业的万元产值排污系数及TN、TP、CODMn的年排放量. 2000年度溧阳市全市工业行业年排放TN 479.9t, TP 40.8t, CODMn的1529.7t,约占太湖外源性污染负荷的2%-3%. 造纸、印染、化工、纺织等行业的万元产值排污系数较其它行业为高.被调查企业排污口废水中TN、TP、CODMn等污染物排放强度具有夜间高于白天等日变化特征.

Characteristics of Industrial Wastewater Discharge in a Typical District of Taihu Watershed:A Case Study of Liyang City, Jiangsu Province

This study investigated the discharge character and intensity of main pollutants as TN, TP and CODMn etc. by industrial manufactories in Liyang City, Jiangsu Province of Taihu basin. The manufactories were included the 18 typical vocations such as chemical engineering, textile and so on. The discharge coefficients of pollutant over products of 10000 yuan and the annual discharge pollutant loads of main industry vocations in Liyang City were calculated. The total annual discharge amounts of TN, TP, CODMn are 479.9 t, 40.8 t and 1529.7 t by industrial vocations in the city, respectively, equivalent to 2%-3% of external source pollutant loads in Taihu Lake. The discharge coefficients of pollutant over products of 10000 yuan that produced by papermaking, printing and dyeing, chemical engineering and textile industry are extremely higher than others. The evidence has been found that pollutant discharge intensity at the industrial waste streams that was monitored in the nighttime was usually higher than those in the daytime.