Reagent for repairing chromium-contaminated soil by using filling principle and method for repairing chromium-contaminated soil by using filling principle

Abstract

The invention belongs to the technical field of soil remediation, and particularly relates to a reagent for repairing chromium-contaminated soil by utilizing a filling principle, and a method for repairing the chromium-contaminated soil by utilizing the filling principle. The reagent provided by the invention comprises a gelatinizing agent and a stabilizing agent which are independently subpackaged, wherein the gelatinizing agent comprises sodium silicate, and the stabilizing agent comprises a water-soluble ferrite. After the reagent is used for repairing the chromium-polluted soil, chromium ions are not detected out in a soil percolate, and the concentration of acid leaching liquid is 0.14 mg / kg or below.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and in particular relates to a medicament for repairing chromium-contaminated soil by using the filling principle and a method for repairing chromium-contaminated soil by using the filling principle. Background technique [0002] There are many kinds of existing soil remediation technologies, which can be divided into three categories according to the principles: physical remediation, chemical remediation and biological remediation. Physical remediation includes direct soil replacement method, thermal method, vitrification remediation method, and electrode-driven remediation method; Restoration includes solidification-stabilization method, leaching method and oxidation-reduction method; bioremediation includes phytoremediation, microbial remediation and bio-combined remediation. [0003] Although the above remediation methods can alleviate the soil pollution problem to a certain extent, ...

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Problems solved by technology

[0003] Although the above remediation methods can alleviate the soil pollution problem to a certain extent, there are various degrees of defects in the treatment process. For example, the direct soil replacement method requires a large amount of soil replacement, and the disposal of contaminated soil is difficult and expensive. , it is difficult to apply on a large scale; the thermal method has high energy consumption, which limits the application of this method; the vitrification repair method requires high temperature and high pressure, which also has the problems of high energy consumption and high cost; the electrode-driven repair method is only suitable for high humidity The soil needs to consume a lot of electricity, the cost is high, and it is also dangerous

[0004] Solidification-stabilization technology is to fix the pollutants in the polluted medium to keep them in a long-term stable state. It is a rapid control and repair method commonly used in soil heavy metal pollution, and it has obvious advantages in the simultaneous treatment of multiple heavy metal-contaminated soils; The disadvantage is that the volume of the treated soil increases, and it is necessary to remove gravel or underground obstacles before the project is implemented, and it is difficult to mix the pollutants and stabilizers evenly; the leaching technology is to use water or an aqueous solution containing flushing aids, A remediation method in which complexing agents or surfactants are injected into contaminated soil or sediments to elute and clean pollutants in the soil. The disadvantage of this method is that the eluents are generally expensive and difficult to popularize. , and the amount of engineering is large, there is a risk of secondary pollution; oxidation-reduction technology is by adding chemical oxidants, such as ozone, hydrogen peroxide, potassium permanganate, etc. or reducing agents, such as SO 2 , FeO, gaseous H 2 S, etc., make it chemically react with pollutants to achieve the purpose of purifying the soil

Generally, the chemical oxidation method is suitable for the remediation of soil and groundwater contaminated by organic matter at the same time, with a narrow range of use, high cost, and a high risk of chemical contamination

[0005] The bioremediation method has the advantages of simple operation, low cost, less disturbance to the environment, and is not easy to cause secondary pollution. However, this method has a long repair period, strict requirements on repair conditions, and is easily affected by changes in the external environment. Remediation of heavy metal contaminated soil

[0006] To sum up, the existing soil remediation technology generally has the problem of high economic cost or high time cost, and the soil remediation technology still needs to be further improved.

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