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Cultivation substrate based on lead and cadmium contaminated soil

A technology for cadmium-contaminated soil and substrates, applied in the fields of lead and heavy metal soil pollution control, and cadmium-contaminated soil remediation, can solve problems such as the diffusion of heavy metal soil pollutants, and achieve the effects of reducing ecological risks, saving transportation costs, and increasing organic matter content

Inactive Publication Date: 2020-05-01
青岛冠中生态股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a planting substrate based on lead and cadmium polluted soil, which solves the technical problem in the prior art that heavy metal soil treatment is prone to pollutant diffusion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] In a lead-zinc mining area, the concentration of total lead in the soil was tested to be 1726.85mg / kg, of which the concentration of bioavailable lead was 1243.47mg / kg. In this repair technical plan, 0.02M aspartic acid diethoxysuccinic acid and 0.01M iminodisuccinic acid are mixed with 0.01M citric acid to make eluent. The volume ratio of succinic acid to citric acid is 1:1:1.

[0019] Pass the excavated lead-contaminated soil through a 5mm sieve after natural air-drying, put the air-dried and sieved lead-contaminated soil into the soil washing container, the volume ratio of the prepared washing agent to soil is 10:1, and connect well After the parts of the soil rinsing device, start rinsing the contaminated soil, adjust the addition rate of the leaching agent, so that the treatment time is maintained at 24 hours, and then rinse the soil twice with the same volume of water as the leaching agent. After testing, the concentration of total lead in the cleaned soil was 32...

Embodiment 2

[0021] In a lead-zinc mining area, the concentration of total cadmium in the soil was tested to be 197.38mg / kg, of which the concentration of bioavailable lead was 183.78mg / kg. In this repair technical plan, 0.01M aspartic acid diethoxysuccinic acid and 0.02M glutamic acid tetrasodium diacetate are mixed with 0.03M citric acid to make eluting agent, aspartic acid diethoxysuccinic acid, glutamic acid The volume ratio of tetrasodium diacetate to citric acid is 1:1:1.

[0022] Pass the excavated cadmium-contaminated soil through a 5mm sieve after natural air-drying, put the cadmium-contaminated soil after air-drying and sieving into the soil rinsing container, the volume ratio of the prepared leaching agent to soil is 15:1, and connect well After the parts of the soil rinsing device, start rinsing the contaminated soil, adjust the addition rate of the leaching agent, so that the treatment time is maintained at 36 hours, and then rinse the soil twice with the same volume of water ...

Embodiment 3

[0024] In a lead-zinc mining area, the concentration ratios of total lead and total cadmium in the soil were tested to be 2146.62mg / kg and 189.29mg / kg, of which the concentrations of bioavailable lead and cadmium were 1763.64mg / kg and 171.28mg / kg respectively . In this restoration technical plan, 0.015M aspartic acid diethoxysuccinic acid, 0.02M iminodisuccinic acid and 0.01M tetrasodium glutamic acid diacetate are mixed with 0.05M citric acid to make a rinse agent. Aspartic acid The volume ratio of diethoxysuccinic acid, iminodisuccinic acid and tetrasodium glutamate diacetate to citric acid is 1:1:1:1.

[0025] Pass the excavated lead and cadmium composite polluted soil through a 5mm sieve after natural air drying, put the air-dried and sieved lead contaminated soil into the soil washing container, the volume ratio of the prepared washing agent to soil is 20:1 , after connecting the parts of the soil washing device, start to wash the contaminated soil, adjust the adding spe...

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Abstract

The invention provides a cultivation substrate based on lead and cadmium contaminated soil, and relates to the technical field of heavy metal contaminated soil remediation. The cultivation substrate based on the lead and cadmium contaminated soil is prepared by the following steps: naturally air-drying heavy metal contaminated soil, and carrying out sieving; performing elution on the sieved soil by using a eluent, namely a mixture of one or more selected from aspartate diethoxysuccinic acid, Iminodisuccinic acid and tetrasodium glutamate diacetate and citric acid; performing elution on the soil subjected to the elution with the eluent by using clean water, of which the volume is equal to the volume of the soil, for 2 times; and then, mixing the soil subjected to the elution with the cleanwater with vermiculite, humic acid and a compost so as to obtain the cultivation substrate. According to the cultivation substrate provided by the invention, the heavy metals are stabilized by using the eluent, so that the cultivation substrate can be directly used in ecological restoration in mining areas.

Description

technical field [0001] The invention relates to the technical field of heavy metal soil pollution treatment, in particular to the technical field of lead and cadmium contaminated soil remediation. Background technique [0002] Mining areas, especially metal mining areas, have a certain degree of heavy metal pollution, which endangers surrounding farmland and surface water. Heavy metal pollution control is required. After mining, the slopes of mines are exposed, which is likely to cause geological disasters such as water and soil erosion. Perform vegetation restoration. At present, there are many remediation techniques for heavy metal-contaminated soil, but the leaching method has the best treatment effect. The remediated heavy metal-contaminated soil is generally difficult to reuse for agricultural production, and is mostly used for construction projects, resulting in a certain degree of waste of resources. In vegetation restoration projects in mining areas, most materials ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01G24/10A01G24/15A01G24/20B09C1/02B09C1/08
CPCA01G24/10A01G24/15A01G24/20B09C1/02B09C1/08
Inventor 李春林许剑平臧小龙曹志泉曹凤娟
Owner 青岛冠中生态股份有限公司
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