Method for carrying out chemical oxidation repair on organic contaminated soil by compounding potassium permanganate (KMnO4) and hydrogen peroxide (H2O2)

Abstract

The invention discloses a method for carrying out chemical oxidation repair on organic contaminated soil by compounding potassium permanganate (KMnO4) and hydrogen peroxide (H2O2). The chemical oxidation repair method comprises the steps of controlling the moisture content of the organic contaminated soil to be less than 15%, and then crushing and screening the soil to enable the soil particle diameter to be less than or equal to 20mm; putting the screened organic contaminated soil into a reactor provided with a mechanical stirring device; adding the KMnO4 into the organic contaminated soil, starting the mechanical stirring device in the reactor at the same time, spraying a prepared H2O2 oxidizing agent on the soil when the soil is evenly stirred, wherein the H2O2 oxidizing agent is sprayed for a plurality of times in batches, the H2O2 oxidizing agent is sprayed once at the interval of 0.5-4h, and the H2O2 oxidizing agent is used out after being sprayed for 3-8 times; stopping stirring, and fully reacting the H2O2 oxidizing agent with the organic contaminated soil for 12-48h. The experiment proves that after the KMnO4 is compounded with the H2O2, the defects that the KMnO4 is slow in reaction and the H2O2 is short in retention time and hard to control can be mutually made up, so that advantage complementarity can be realized, the repair effect is improved, and the repair work period is shortened.

Description

technical field [0001] The invention relates to a chemical oxidation restoration method for organic polluted soil, in particular to a method for chemical oxidation restoration of organic polluted soil by using potassium permanganate-hydrogen peroxide compound, belonging to the technical field of soil restoration. Background technique [0002] Soil is located in the center of the natural environment. It is the material basis for human survival and the central link connecting the inorganic and organic, biological and non-biological realms in the natural environment. With the development of production, petroleum, benzene series, pesticides, polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), persistent organic pollutants (POPs), etc. More and more organic pollutants are entering the soil system through various channels. Once the soil is polluted, it will not only directly affect crops, but also threaten groundwater quality and human health. Therefore, soi...

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Problems solved by technology

In the traditional organic contaminated soil remediation method, the physical method requires a large amount of engineering, a large investment in manpower and material resources, and the corresponding cost is relatively high, and the pollutants cannot be eliminated fundamentally.

Although bioremediation technology is currently researched and applied more methods, bioremediation technology has its shortcomings: the repair time is generally long, it is difficult to achieve the repair effect in a short time, and it cannot meet the urgent need for development and utilization of contaminated sites in my country after remediation. national conditions

[0012] According to my country's current national conditions for land demand, the use of chemical oxidation technology to remediate organically polluted soil has the advantages of high remediation efficiency and shorter remediation cycle than physical and biological remediation, but for large-scale organic polluted soil polluted by various pollutants, the ectopic chemical Oxidative remediation still has the problem of low soil remediation efficiency and inability to fully oxidize and degrade effectively, thus limiting the large-scale application of ex-situ chemical oxidation remediation methods

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