Application and remediation method of calcium polysulfide in chromium-contaminated soil or underground water remediation

The invention discloses application and a remediation method of calcium polysulfide in chromium-contaminated soil or underground water remediation. Calcium polysulfide is adopted for chromium contamination remediation, and two remediation methods are particularly related. The method for remediating chromium-contaminated soil by calcium polysulfide comprises the following steps: investigating the chromium contamination degree of soil, preparing a calcium polysulfide water agent, determining the adding ratio of the calcium polysulfide water agent, adding the calcium polysulfide water agent, supplying water, carrying out remediation reaction, maintaining soil and adjusting the nature of the remediated soil. The method for remediating chromium-contaminated underground water by calcium polysulfide comprises the following steps: arranging injection points, determining the amount of a remediation agent, preparing the remediation agent, positioning the injection points, injecting the calcium polysulfide remediation agent, adjusting the positions and amounts of the injection points and the like. According to the invention, the operation process is simple; the agents are stable in source; the reaction speed is high; the remediation effect is good; the chromium-contaminated soil or underground water can be stable for a long time after remediation; the remediation method can be applied to large-scale implementation, is economic and reasonable, and is a relatively ideal chromium-contaminated soil or underground water remediation technique.