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

A technology for remediation of chromium-contaminated soil and groundwater, applied in the field of soil remediation, can solve the problems of unsatisfactory remediation effect of remediation agents, inability to choose remediation methods, and complicated operation procedures, so as to achieve long-term stable remediation effect, lasting and stable remediation effect, and remediation operation. Simple process effect

Active Publication Date: 2015-07-08
BCEG ENVIRONMENTAL REMEDIATION CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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; i

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

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Embodiment 1

[0059] The remediation method of remediating chromium-contaminated soil with calcium polysulfide, the process is as follows figure 1 , including the following steps,

[0060] Step 1, soil chromium pollution degree investigation: investigate and determine the degree of chromium pollution in the soil, determine the initial concentration of Cr(VI) in the soil;

[0061] Step 2, prepare calcium polysulfide aqua: add water after the direct market purchase 29% calcium polysulfide aqua or purchase 45% solid calcium polysulfide and be mixed with 29% calcium polysulfide aqua;

[0062] Step 3, determine the dosing ratio of calcium polysulfide aqua: according to the composition of calcium polysulfide aqua and the initial concentration of Cr(VI) in soil, determine the dosing ratio of calcium polysulfide aqua; Described polysulfide aqua CaS 5 The mass concentration is 0-29%. Since the main component of calcium polysulfide water is CaS 5 , so according to Cr(VI) and CaS 5 Calculate the ...

Embodiment 2

[0074] The restoration method of repairing chromium-contaminated groundwater with calcium polysulfide, in this embodiment, the repaired groundwater pollution range is 4m long, 4m wide, and 1.5-7.5m deep, and the total amount of groundwater restoration is 4*4*6*0.3=29m 3 . The repair specifically includes the following steps:

[0075] Step 1. Arranging injection points and determining the amount of calcium polysulfide: Divide the restoration site into several restoration areas according to the difference in pollution concentration, and determine the dosage ratio of each restoration area according to the pollution concentration, and calculate the restoration dose of each restoration area. The sum of the restoration agent doses in each restoration area is the required restoration agent dosage. Calcium polysulfide is injected into the groundwater polluted area at the injection point, and the penetration influence range is a cylinder. The radius of the cylinder is the influence rad...

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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...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/02B09C1/08
Inventor 李书鹏许超郭丽莉李珊王汀洲赵晓波
Owner BCEG ENVIRONMENTAL REMEDIATION CO LTD
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