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Green ecological remediation method for soil

A soil remediation and soil technology, applied in the field of soil remediation, can solve the problems of high treatment efficiency, low treatment cost, and high repair cost

Inactive Publication Date: 2019-07-02
梅滨
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using foreign soil, leaching method, heat treatment method, electrolysis method, and chemical repair method all have the characteristics of high repair cost and poor effect
In the prior art, there is a solution of using biological methods for restoration. For example, relevant studies have found that rodent earthworms can absorb some heavy metals, and the method of planting plants can also absorb some heavy metals, but there is no treatment in the prior art Soil remediation method with high efficiency, low treatment cost and strong field operability

Method used

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  • Green ecological remediation method for soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Soil plowing and irrigation: Plow and level off the soil to be repaired in a plot 1, take samples at 5 points of Meihua, and then soak the soil for 2 days;

[0054] Water diversion and land preparation: water land preparation and keep the water surface depth not less than 3cm;

[0055] Anoxic or anaerobic repair: Evenly apply 0.78 kg / mu of ferrous salt or ferrous salt, 6 kg / mu of bacterial carrier kenaf powder, and add 42 kg / mu of mixed strain solution to maintain sufficient water in the repaired soil, and Seal the cover above the water surface, so that the repaired soil has been in anoxic or anaerobic state for 6 months, and add appropriate water during this period to keep the depth of the water surface not lower than 3cm, so that the forms of various heavy metal elements in the soil change, change the existing form of heavy metals in the soil, reduce the toxicity of heavy metals, and obtain repaired soil; the concentration of bacteria in the mixed bacteria solution is...

Embodiment 2

[0065] Soil plowing and irrigation steps: plow and level the repaired soil in a plot 2, take samples at 5 points of Meihua, and then soak the soil for 2 days;

[0066] Water diversion and land preparation steps: water diversion and land preparation and keep the water surface depth not less than 3cm;

[0067] Anoxic and anaerobic repair steps: uniformly apply 0.89 kg / mu of ferrous salt or ferrous salt, 8 kg / mu of bacterial carrier kenaf powder, and add 30 kg / mu of mixed strain solution to maintain sufficient water for repairing the soil. And seal the cover above the water surface, so that the repaired soil has been in anoxic or anaerobic state for 1.5 months, during which appropriate water should be added to keep the depth of the water surface not lower than 3cm, so that the forms of various heavy metals in the soil change, reduce the toxicity of heavy metals, and obtain repaired soil; the concentration of bacteria in the mixed bacteria solution is 0.1×10 8 cells / mL. The mixe...

Embodiment 3

[0077] Soil plowing and irrigation steps: plowing and leveling the repaired soil of a plot 3, taking samples at 5 points of plum blossoms, and then soaking the soil for 2 days;

[0078] Water diversion and land preparation steps: water diversion and land preparation and keep the water surface depth not less than 3cm;

[0079] Anoxic and anaerobic repair steps: uniformly apply 0.8 kg / mu of ferrous salt or ferrous salt, 5 kg / mu of bacterial carrier kenaf powder, and add 20 kg / mu of mixed strain solution to maintain sufficient water in the repaired soil, and Cover the water surface with a cover so that the repaired soil has been in anoxic or anaerobic state for 1 month, and add appropriate water during this period to keep the depth of the water surface not lower than 3cm, so that the forms of various heavy metal elements in the soil can occur changes, reducing the toxicity of heavy metals, and obtaining repaired soil; the concentration of bacteria in the mixed strain solution is ...

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Abstract

The invention relates to a soil remediation method. The remediation method comprises the following steps: performing soil ploughing irrigation: ploughing soil to be remediated, performing irrigation soaking, and performing ridging on the periphery; performing water diversion soil preparation: performing water diversion soil preparation and maintaining the water surface depth not less than 3 cm; and performing anoxic or anaerobic remediation: after a certain amount of iron salt and / or ferrous salt, bacterial carrier powder and a mixed strain solution are uniformly applied, keeping a water amount of the soil to be remediated sufficient, and sealing and covering the water surface by a covering. According to the method provided by the invention, an environment conducive to growth of anaerobicbacteria and facultative bacteria is created, mobility and bioavailability of heavy metals are reduced while the form of the heavy metals in the soil to be remediated is changed and the toxicity of the heavy metals is reduced, and therefore soil contaminated by the heavy metals is purified.

Description

technical field [0001] The invention relates to a soil restoration method. Background technique [0002] With the rapid development of world industry, the soil in many regions of the earth is polluted by heavy metals to varying degrees, and the polluted area has a tendency to expand. The world emits 15,000 tons of Hg, 400,000 tons of Cu, 5 million tons of Pb, and 1,500 tons of Mn every year. 10,000 tons, 1 million tons of Ni, 39,000 tons of Cd. According to the 2015 China Environmental Bulletin, the area of ​​land polluted by heavy metals in my country is about 1.623 billion mu, of which the area of ​​cultivated land polluted by heavy metals such as Cd is nearly 2.0×10 7 hectare. Unlike other pollutants, heavy metals in polluted soil are not easily leached by water, nor can they be biodegraded, but they can be absorbed by plants and endanger human life and health through the food chain. [0003] At present, countries all over the world attach great importance to the resea...

Claims

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Application Information

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IPC IPC(8): B09C1/10
CPCB09C1/105B09C2101/00
Inventor 马前梅滨
Owner 梅滨
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