Repairing method of soil polluted by chromium residue

A technology of polluted soil and remediation method, which is applied in the field of heavy metal polluted soil and can solve problems such as pollution

Inactive Publication Date: 2010-10-20
刘杰
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Problems solved by technology

In addition, elements such as lead, cadmium, zinc, and arsenic are also common sources of pollution, especially when they

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  • Repairing method of soil polluted by chromium residue
  • Repairing method of soil polluted by chromium residue

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Embodiment Construction

[0030] The principles and features of the present invention are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the present invention, and are not intended to limit the scope of the present invention.

[0031] The target object of the embodiment is the site left over from the renovation process of a certain chemical plant. Due to the pollution of chromium slag, electroplating waste slag, contaminated brick slag, cinder and other harmful substances, the contaminated soil to be treated is seriously polluted by chromium, lead, cadmium, zinc, and arsenic: the chromium content in the soil is 23.35~20836.33mg / kg, the maximum exceeding the standard by 54.8 times; the lead content is 6.00-49423.56mg / kg, the maximum exceeding the standard by 93.3 times; the zinc content is 13.26-110000mg / kg, the maximum exceeding the standard by 152.8 times; the cadmium content is 0-3400mg / kg, the maximum exceeding the standard by 283.3 tim...

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Abstract

The invention relates to a method for repairing and processing the soil polluted by heavy metals such as chromium and the like and semimetal elements such as arsenic and the like, and eliminating the pollution influence. The method mainly comprises the following steps: carrying out the dry treatment on the polluted soil, and carrying out the crushing and grinding treatment; carrying out the reduction treatment by a reducing agent on the polluted soil which is crushed and ground; carrying out a first curing process by a first curing agent on the polluted soil which undergoes the reduction treatment; carrying out a second curing process by a second curing agent on the polluted soil which undergoes the first curing process, thus obtaining the repaired soil. By the processing programs, harmful substances such as the heavy metals and the like in the polluted oil are solidified into the stable state; and the toxicity of the harmful substances is obviously reduced and is not easily diffused.

Description

technical field [0001] The invention relates to a restoration method for repairing soil polluted by heavy metals such as chromium and semi-metal elements such as arsenic and eliminating the influence of pollution, especially for soil polluted by heavy metals such as hexavalent chromium. Background technique [0002] Heavy metal pollution is environmental pollution caused by heavy metals or their compounds. It is mainly caused by human factors such as mining, sewage discharge and use of heavy metal products. The degree of harm depends on the concentration and chemical form of heavy metals in the environment. [0003] Chromium is a common source of heavy metal pollution, and different forms of existence directly affect the toxicity and migration of chromium. Hexavalent chromium has strong oxidizing properties and high toxicity. In order to reduce or eliminate its toxicity and prevent its diffusion, it is usually necessary to convert hexavalent chromium into trivalent chromiu...

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Application Information

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IPC IPC(8): B09C1/08A62D3/37
Inventor 刘杰
Owner 刘杰
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