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Composite stabilizer for contaminated soil and method for treating contaminated soil by virtue of composite stabilizer

A compound stabilizer and a technology for polluted soil, which is applied in the field of compound stabilizer for polluted soil and its treatment of polluted soil, which can solve the problems of poor practicability, low solubility, low toxicity, etc., to reduce migration ability and improve stabilization efficiency , Improve the effect of acidic soil

Inactive Publication Date: 2016-09-21
湖南省环境保护科学研究院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] (4) Chemical stabilization refers to the addition of chemical agents to the soil to change the existing form of heavy metals in the soil and transform them into substances with low toxicity, low solubility and low mobility. The main technologies include redox potential technology and pH control technology , ion exchange technology, precipitation technology, adsorption technology, etc., through these technical means to change the state of heavy metals in the soil, thereby reducing their bioavailability and mobility
Although this method reduces the dissolution of arsenic and cadmium in the polluted soil to a certain extent, the complex formed by the agent and the heavy metal is likely to cause secondary pollution
[0010] (5) Stabilization of mineral materials refers to the stabilization of contaminated soil through a combination of one or more mineral materials (such as kaolin, montmorillonite, sepiolite, bentonite, zeolite, etc.), although the effect is obvious, but the cost is high , not very practical

Method used

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  • Composite stabilizer for contaminated soil and method for treating contaminated soil by virtue of composite stabilizer
  • Composite stabilizer for contaminated soil and method for treating contaminated soil by virtue of composite stabilizer
  • Composite stabilizer for contaminated soil and method for treating contaminated soil by virtue of composite stabilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The soil for testing was taken from a chemical factory in Hunan Province. The sampling depth was 0-20cm. The cadmium content in the polluted soil was 80-500mg / kg; the arsenic content was 0.8-8.0mg / kg.

[0035] The compound stabilizer used in present embodiment contaminated soil comprises the following components in parts by weight:

[0036] 20-30 parts of iron powder, 2-7 parts of aluminum powder, 45-55 parts of calcium oxide

[0037] 15-25 parts of meerschaum.

[0038] Preferable: 25 parts of iron powder, 5 parts of aluminum powder, 50 parts of calcium oxide, 20 parts of sepiolite.

[0039] The sepiolite is 200 mesh sepiolite fine powder.

[0040] The iron powder is reduced iron powder.

[0041] Use the above composite stabilizer for contaminated soil (when the composite stabilizer for contaminated soil is not in use, please pay attention to reduce contact with air and water, keep good storage conditions, avoid moisture and oxidation as much as possible, and prevent i...

Embodiment 2

[0054] The difference with Example 1 is: the polluted soil sample is different (see Table 1 for details) and the composite stabilizer for the present embodiment polluted soil comprises the following components in parts by weight:

[0055] 30-40 parts of iron powder 2-7 parts of aluminum powder 35-45 parts of calcium oxide

[0056] 15-25 parts of meerschaum.

[0057] Preferable: 35 parts of iron powder, 5 parts of aluminum powder, 40 parts of calcium oxide, 20 parts of sepiolite.

[0058] Treat with a second extractant.

[0059] The leachate obtained by the two methods obtained in this example was tested (refer to the prior art for the detection method), and the test results are shown in Table 1.

Embodiment 3

[0061] The difference with Example 1 is: the polluted soil sample is different (see Table 1 for details) and the composite stabilizer for the present embodiment polluted soil comprises the following components in parts by weight:

[0062] 25-30 parts of iron powder 2-5 parts of aluminum powder 40-50 parts of calcium oxide

[0063] 15-25 parts of sepiolite and 2-7 parts of activated biochar.

[0064] Preferred: 28 parts of iron powder, 3.5 parts of aluminum powder, 45 parts of calcium oxide, 20 parts of sepiolite, and 7 parts of activated biochar.

[0065] The preparation method of the activated biochar is as follows: first, rice straw is used as a raw material (conventional materials such as straw and coconut shell can also be used for combination) with clear water and dried; then the raw material is placed in a 70°C oven and baked to constant weight , then crushed and sieved to obtain pulverized material (particle size less than 5mm); finally pulverized material is put into ...

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Abstract

The invention provides a composite stabilizer for contaminated soil. The composite stabilizer comprises the following components in parts by weight: 20 to 30 parts of iron powder, 2 to 7 parts of aluminum powder, 45 to 55 parts of calcium oxide and 15 to 25 parts of sepiolite. The technical scheme has the effects that the composite stabilizer consists of the iron powder, the aluminum powder, the calcium oxide and the sepiolite, and the iron powder and the aluminum powder can be used for reducing arsenic and cadmium in an environment and reducing toxicity, and can also form a complex and a compound with the arsenic and the cadmium to reduce the migration capability; the sepiolite has a large specific surface area, can be used for adsorbing a large number of substances, is an excellent loading carrier, and has a catalytic effect; the calcium oxide can be used for regulating a reaction condition to be alkaline, and heavy metals can be precipitated more easily under the alkaline condition; a unique proportion is adopted, so that optimal stabilization effects of the composite stabilizer on the arsenic and the cadmium in the contaminated soil can be achieved under the condition of lowest cost. The invention also provides a treatment method for the contaminated soil. The method comprises simple steps, and is high in practicability, and parameters are easy to control.

Description

technical field [0001] The invention relates to the technical field of polluted soil treatment, in particular to a composite stabilizer for polluted soil and a method for treating polluted soil. Background technique [0002] With the continuous updating of technology, the degree of environmental pollution is gradually reflected. For the chemical industry, the pollution of soil has also attracted more and more attention. For most areas, the pollutants of soil pollution are mainly two heavy metals, arsenic and cadmium, and they show the environmental pollution characteristics of multi-source, compound, large amount, wide area, long-lasting, and poisonous. Therefore, the treatment of polluted soil is urgent. [0003] At present, there are mainly two ways to remediate soil arsenic and cadmium compound pollution: 1. Change the existing form of heavy metals in polluted soil to convert them from an active state to a stable state, thereby reducing their mobility and biological prope...

Claims

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Application Information

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IPC IPC(8): C09K17/06
CPCC09K17/06
Inventor 陈灿陈宣宇万勇钟振宇
Owner 湖南省环境保护科学研究院
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