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Reparation method of polluted soil

A technology of polluted soil and remediation method, which is applied in the field of remediation of contaminated soil, can solve the problem of high remediation cost, achieve the effect of reducing remediation cost, improving fertility and eliminating pathogenic bacteria

Inactive Publication Date: 2014-09-24
SHANXIN KETAO TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem of high repair cost in the prior art, the embodiment of the present invention provides a soil repair method

Method used

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  • Reparation method of polluted soil
  • Reparation method of polluted soil
  • Reparation method of polluted soil

Examples

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preparation example Construction

[0027] Based on the above, the embodiment of the present invention provides a method for repairing contaminated soil, with figure 1 A flowchart of the preparation method. as attached figure 1 As shown, the method includes:

[0028] Step 101. Prepare a soil remediation agent, which includes the following components by weight percentage: 30%-40% fly ash; 2%-5% water-absorbing agent, and the balance is municipal sludge.

[0029] In order to ensure that the urban sludge in the soil remediation agent is completely harmless, the soil remediation agent in the present invention includes the following components by weight percentage: 30%-40% of fly ash; 2%-5% of water-absorbing agent, and the balance is urban sludge.

[0030] Preferably, the water-absorbing agent is at least one of soda lime, quicklime and anhydrous calcium chloride. In order to enable fly ash to absorb a large amount of water in municipal sludge, to promote the reaction of calcium oxide and free calcium in fly ash...

Embodiment 1

[0044] Step a, mixing 30% high-calcium fly ash, 2.5% soda lime and the rest of urban sludge by weight, and composting at 50°C in a cool environment to obtain soil restoration agent.

[0045] Wherein, the weight percentage of calcium oxide in the high-calcium fly ash is 18%; the weight percentage of free calcium is 0.4%.

[0046] Step b, mixing the soil remediation agent and the contaminated soil in step a, controlling the mass ratio of the soil remediation agent to the contaminated soil to be 1:2.1, to obtain contaminated soil containing the soil remediation agent;

[0047] Step c, under the condition that the temperature is higher than 0 ° C, the contaminated soil containing the soil remediation agent in step b is left to stand for 68 hours, so that the moisture content of the contaminated soil containing the soil remediation agent is 32%, and the pH is 8, Get improved soil, so as to remediate polluted soil.

Embodiment 2

[0049] Step a, mixing 35% high-calcium fly ash, 2% quicklime, and the rest of the urban sludge by weight, and composting at 55°C in a cool environment to obtain a soil remediation agent .

[0050] Wherein, the weight percentage of calcium oxide in the high-calcium fly ash is 35%; the weight percentage of free calcium is 0.3%.

[0051] Step b, mixing the soil remediation agent and the contaminated soil in step a, controlling the mass ratio of the soil remediation agent to the contaminated soil to be 1:2.2, to obtain contaminated soil containing the soil remediation agent;

[0052] Step c, under the condition that the temperature is higher than 0°C, leave the contaminated soil containing the soil remediation agent in step b for 60 hours, so that the moisture content of the contaminated soil containing the soil remediation agent is 30%, and the pH is 7, Get improved soil, so as to remediate polluted soil.

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Abstract

The invention discloses a soil reparation method, and belongs to the field of soil reparation. The method comprises the following steps: preparing a soil reparation agent comprising the following components in percentage by weight: 30-40% of pulverized coal ash, 2%-5% of a water absorbent and the balance of urban sludge, mixing the soil reparation agent with polluted soil, standing at the temperature higher than 0 DEG C for 60-80 hours so as to enable the water content of the polluted soil of the soil reparation agent to be 30-40% and enable the pH value to be greater than 7, thereby repairing the polluted soil. Urban sludge can supply a great amount of organic substances and nutritional ingredients for the polluted soil, and the fertility of polluted soil is improved; the pulverized coal ash after absorbing water and being pulverized not only can eliminate pathogenic bacteria in urban sludge and perform innocent treatment, but also can loosen the polluted soil, and the water-holding capacity of the polluted soil can be improved. According to the invention, the urban sludge and pulverized coal ash are utilized resourcefully, not only is the pollution of urban sludge and pulverized coal ash to the environment reduced, but also the reparation cost of the polluted soil is reduced, and the win-win effect of economical benefit and social benefit is achieved.

Description

technical field [0001] The invention relates to the field of soil remediation, in particular to a method for remediating polluted soil. Background technique [0002] Soil is an indispensable natural resource that is difficult to regenerate. It is mainly composed of minerals, organic matter, soil organisms, water, air, oxidized humus and other components. Habitat for survival. However, in recent years, due to unreasonable mining of mineral resources, abuse of chemical fertilizers and pesticides, long-term sewage irrigation and sludge application of soil, soil pollution and degradation have become more and more serious, causing serious damage to the ecological environment. Therefore, it is necessary to provide a remediation method for polluted soil. [0003] The prior art makes soil remediation agent by mixing the organic fertilizer of 45-55 parts by weight, the chelated zinc of 3-5 parts by weight, the medical stone of 38-44 parts by weight and the microbial bacterial agent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
Inventor 解贵解慧源孙秀花周巍张丽华赵占群
Owner SHANXIN KETAO TECH BEIJING
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