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

Abstract

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.

Description

technical field [0001] The invention relates to the technical field of soil remediation, in particular to a use and a remediation method of calcium polysulfide in the remediation of chromium-contaminated soil or groundwater. Background technique [0002] Chromium is an element that widely exists in nature. It is distributed in water, soil, animals and plants, and its content is low, which plays a beneficial role. Chromium and its compounds are widely used in industrial and agricultural production, such as textiles, leather manufacturing, electroplating, printing and dyeing, and chromium salt production. Due to regulatory oversight and improper handling, chromium pollution incidents have occurred frequently in recent years, causing serious damage to the local ecology. The environment and human health pose a huge threat. [0003] In the prior art, CN 102295933 A discloses a special stabilizer for chromium-contaminated soil. To use it, the contaminated soil must be fully mixed...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a use and restoration method of calcium polysulfide in the restoration of chromium-contaminated soil or groundwater, so as to solve the problem of unsatisfactory restoration effects of restoration agents used in existing restoration techniques, high dosage of agents, long restoration period, and poor operating procedures. It is cumbersome, poor stability after remediation, relatively large soil volume increase after remediation, and is not conducive to the technical problems of subsequent disposal; it also solves the technical problems that the remediation agents used in the prior art are mainly used for ex-situ repair, for pollution depths such as more than 5m, or subsequent development Poor applicability in situations where it is inconvenient to use and large-scale excavation, the remediation method cannot be selected according to the pollution characteristics of different polluted sites, there are certain limitations, and the technical problem is that it is not suitable for large-scale remediation of soil with high concentration of chromium pollution

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