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Method for repairing soil heavy metal pollution by heat treatment method

A technology for soil remediation and heat treatment, which is applied in the field of remediation of heavy metal pollution in soil by heat treatment, which can solve problems such as improving the mobility of heavy metals, and achieve the effects of high porosity and large specific surface area.

Pending Publication Date: 2021-12-14
山东创业环保科技发展有限公司
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  • Claims
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Problems solved by technology

[0006] (2) There are relatively large application limitations for compound heavy metal pollution: in compound polluted soil, there is a competitive adsorption relationship between different heavy metals and between heavy metals and the inherent alkali metals, magnesium and manganese in the soil, and even certain interactions occur under the interaction. A case of increased mobility of heavy metals

Method used

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  • Method for repairing soil heavy metal pollution by heat treatment method
  • Method for repairing soil heavy metal pollution by heat treatment method
  • Method for repairing soil heavy metal pollution by heat treatment method

Examples

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Embodiment

[0027] The contaminated soil remediated in this example comes from the decommissioned area of ​​a smelting plant.

[0028] The specific implementation method includes the following steps:

[0029] (1) Collect the soil to remove the impurities and grass roots visible to the naked eye, pass through a 2mm sieve after crushing, and use the "Solid Waste Leaching Toxic Leaching Method Acetic Acid Buffer Solution Method" (HJ / T300-2007) to carry out toxic leaching experiments on soil samples. It shows that The present embodiment pollutes soil heavy metal with lead, cadmium as main (table 1); Adopt BCR three-step graded extraction method to obtain lead, cadmium acid-soluble state, reducible state, oxidizable state and the form distribution of residue state in the sample (table 2 ,table 3).

[0030] (2) Measure the effective silicon content in the polluted soil, calculate the addition ratio of silica fume and slaked lime to be 2.7% and 4.8% respectively, mix the soil evenly after the a...

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Abstract

The invention belongs to the technical field of soil pollution treatment, and particularly relates to a method for repairing soil heavy metal pollution by a heat treatment method, which comprises the following steps of: heavy metal pollution soil is homogenized; a passivating agent is added into the soil, the passivating agent and the soil are mixed to be uniform, water is added, and the passivating agent comprises a silicon dioxide material and a lime material; the soil added with the passivating agent is subjected to heat treatment in a stirring state; and the treated soil is subjected to leaching toxicity detection, and the soil can be used for backfilling after the leaching toxicity detection result reaches the environmental pollution control standard. The method has the advantages that the treated soil heavy metal is converted into a stable residue state, the passivation effect is thorough, the stability is high, follow-up maintenance is not needed, re-activation of the heavy metal is avoided, and the risk of secondary activation of the heavy metal can be effectively avoided. The method is high in operability, high in heavy metal pollution treatment efficiency, wide in treatable heavy metal pollution variety and capable of achieving synchronous passivation on composite heavy metal pollution.

Description

technical field [0001] The invention belongs to the technical field of soil pollution control, and in particular relates to a method for repairing soil heavy metal pollution by heat treatment. Background technique [0002] Heavy metal chemical passivation remediation is a method based on chemical measures to reduce the chemical activity of pollutants by changing the occurrence form of heavy metals, so as to achieve the purpose of remediation of heavy metal contaminated soil. With the continuous deepening of the application research of different types of passivation materials, passivation repair has become the most widely used heavy metal pollution repair method. [0003] Alkaline materials, phosphate materials, silicate materials and chelating agent-type organic materials are common soil heavy metal remediation and stabilization materials. The mechanism of action includes pH control, adsorption, precipitation, complexation and ion exchange, etc.: alkaline materials improve s...

Claims

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Application Information

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IPC IPC(8): B09C1/06
CPCB09C1/06
Inventor 房彬张建李书锋路明马劲刘建阔王兆丰
Owner 山东创业环保科技发展有限公司
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