高原地区铬渣污染场地污染特性研究

在我国高原地区某铬渣污染场地进行钻孔取样,分析场地工程地质特性,对场地铬的污染状况及空间分布特征进行研究。结果表明:场地地质结构较单一,地下水丰富,土质的渗透性强,渗透系数在1.78×10-3~0.243 cm/s之间;场地铬污染严重,总铬与六价铬的浓度最大值分别为22 485.6 mg/kg和7 495.2 mg/kg,地下水中六价铬的浓度最大值为107.2 mg/L;通过剖面铬浓度分析:铬在纵向上浓度分布受土壤质地的影响,均呈现表层4 m浓度较高,4 m以下浓度较低且变化较小的规律。由Kriging插值法绘的铬浓度分布等值线图可清晰看出场地表层土表现出向沟谷位置迁移趋势,地下水中残留的铬向地下水流场方向迁移。

Study on the polluting property of chrome residue contaminated sites in plateau section

Through drill hole sampling in a chromium slag contaminated site in plateau section of China,the engineering geological characteristics, Cr pollution and spatial distribution of the site were studied. The results showed that the site had a simplex geological structure, abundant ground water, a high permeability of soil,and the field coefficient of permeability ranged from 1.78 × 10~(-3) cm/s to 0. 243 cm/s. The space was seriously polluted by Cr. In soil, the maximum concentration of total Cr was 22485.6 mg/kg, that of Cr (VI) was 7495.2 mg/kg, and in the ground water, that of Cr(VI) was 107.2 mg/L. The content of Cr in the soil section showed that it had the highest concentration at 4 m under ground, but at the lower soil it was lighter, and had little change. This distribution pattern was related with the soil texture. It was found that Cr was transported to the valley floor in the topsoil, and the transport of the pollutant in the ground water was towards the groundwater flow field form the Cr concentration contour map whieh was drawn by Kriging' s method of interpolation.