浙江海宁某典型制革污泥堆场污染分布特征

POLLUTION CHARACTERISTICS OF A TYPICAL TANNERY SLUDGE STORAGE SITE IN HAINING,ZHEJIANG PROVINCE

为研究典型制革污泥堆场区域污染情况,以浙江海宁某制革污泥堆场为研究对象,研究了制革污泥堆场土壤和地下水中有机物和重金属的污染情况。调查结果表明:土壤中无机污染很小,而总铬、六价铬和铅含量较高。污染土壤中铅和总铬含量分别是工业用地规定值的2.82,7.03倍,而六价铬最高含量为管控值的2.8倍。地下水中氨氮含量超标严重,达到1268.0 mg/L,是GB/T 14848-2017《地下水质量标准》中工农业Ⅴ类用水下限值的845.3倍,六价铬的含量<0.004 mg/L。此外,各取样点六价铬和总铬含量的垂直分布显示较大的差异,也与某些制革污泥堆场的重金属垂直分布规律不尽相同。

In order to study the pollution situation of a typical tannery sludge yard area,a tannery sludge yard in Haining,Zhejiang Province was taken as the research object to study the pollution of organic matters and heavy metals in the soil and groundwater of the tannery sludge yard.The survey results showed that the inorganic pollution in the soil was slight,and the total chromium,hexavalent chromium and lead content were relatively higher.The lead and total chromium concentration in the contaminated soil were 2.82 times and 7.03 times of the specified value of industrial land respectively,and the maximum content of hexavalent chromium was 2.8 times of the control value.The ammonia nitrogen content in groundwater exceeded the standard seriously,reaching 1268.0 mg/L,which was 845.3 times of the lower limit of category V water quality for industrial and agricultural use,and the content of hexavalent chromium was less than 0.004 mg/L.In addition,the vertical distribution of hexavalent chromium and total chromium content at each sampling point showed a large difference,which was also different from the vertical distribution of heavy metals in some tannery sludge yards.