The Analysis And Evaluation Of Contaminated Soil By Chromium In The Chromic Polluted Site

The production of chromic salts in China was established in1958, with the rapid development of economy, chromic industry was also obtained the rapid progress. But the process of manufacturing chromium salt will produce a large amount of wastes residue containing chromium element. Therefore, the repairing of chromic slag polluted site draw extensive concern of relevant state departments and the whole society on it. This dissertation takes the chromic polluted site of Mingle Fuyuan chemical industry in Gansu province as an example to study area pollution survey, pollution evaluation and relevant repair technologies and discuss its feasibility. Finally, obtain the following results:(1) Chromium slag pollution area pollution levels:according investigation, the original chromic slag polluted site was contaminated seriously, the key pollutant is total chrome and chrome(VI). This indicates that the surface soil is heavy pollution area.(2) The distribution of chromic pollution is that contaminated resign go around the slag dump and the situation is weaken and spreading gradually with the distance is far away from the center in the direction of north and south. And other tow directions is the water shed. The concentration of total chrome and chrome(VI) is reducing with the deep goes deeper.(3) Chromium slag pollution area pollution evaluation:utilization the method of soil assessment conducts evolution on chromic polluted site to analysis the pollution degree; using the healthy risk assessment of polluted sites analyze the repaired target and ensure24mg/kg as the target of chromic(Ⅵ) concentration.(4) Chromium residue contaminated site remediation plan:Comparing typical repairing methods, selecting "the acid leaching+pharmaceutical stabilization" as the final solution.