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

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.