| The pollution resulting from a superseded chromic-salt factory is investigated through the acquisition and analysis of information including soil, the ground water and the surface water pollution. Studied chromium pollution government scheme according to the related monitor data analysis and the hydrogeological state of the area.The paper has estimated chromium pollution by the classical exponential method and the pollutant spreading rule which used the Kriging interpolation draw isogram by classical statistics and geostatistics. The results show that:①In 2001-2003, the groundwater pollution by hexavalent chromium was the most serious, the highest pollution index had reached to 11,270, the index had declined after 2003. In recent years, change was little, but the pollution index is still up nearly 6,000, pollution is still serious;②The groundwater pollution was the most serious in dry season, and pollution was more serious with rainfall increasing in dry season;③Chromium contamination of groundwater spreaded from the factory to the northwest, and finally spilled surface with the formation of springs;④Surface water pollution from 2001 to 2009 showed a falling trend, but upstream pollution was still serious. Pollution trend analysis showed the same trend of lower;⑤At The Chromium-salt factory,local concentration of total chromium in soil surface was up to 22586.0 mg·kg-1, hexavalent chromium was up to 7420.6 mg·kg-1, pollution was very serious. The chromium concentration in soil decreased rapidly with horizontal distance increasing from the factory. Pollution spreaded to west.Remediation Plan:①Recommended to choose dry detoxification for chrome residue;②Recommended soil solidification/stabilization technology and micro-processing technologies for soil by utilizing sheep and cattle dung of pastoral areas as a biological treatment material;③Proposed groundwater permeable reaction and grating technology for groundwater renovation. |
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