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Remediation method of heavy metal-polluted soil

A technology that pollutes soil and heavy metals. It is applied in the field of soil pollution control. It can solve the problems of secondary pollution of soil and groundwater, difficult separation of harmful chemicals, and high price, so as to reduce the cost of leaching, increase the amount of dissolution, and avoid dust pollution. Effect

Inactive Publication Date: 2015-01-28
BEIJING GEOENVIRON ENG & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problems that soil leaching must solve are: ① If the soil leaching method is only a physical process, the pollutants only migrate, and their toxicity does not decrease, so it involves the separation of soil / eluent, and the separation of eluent / pollutant separation and recycling of eluent; ②If there is a chemical process in the soil leaching process, potentially harmful chemicals used in leaching may be difficult to separate from the treated soil
However, the currently used leaching agents with better effects are relatively expensive and cannot be used in large-scale actual repairs, and the secondary pollution of soil and groundwater may be caused by the residue of leaching agents.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The remediation method of the heavy metal contaminated soil of the present embodiment is as follows:

[0032] a. Soil primary screening: Spray water on the contaminated soil, and under the action of hydraulic flushing, the contaminated soil is screened through the screening device. After screening, the soil particles with a particle size of less than 0.05mm are removed (small particles of soil are difficult to be washed clean, so they are collected uniformly and processed by other methods) to obtain soil slurry with a water content of 60-70wt%.

[0033] b. Separation of sand and water: the soil slurry obtained in step a is separated from sand and water by using a cyclone sand-water separator. After removing the supernatant, collect the sediment, and the water content of the sediment is kept at 40wt%~50wt%. Separation of sand and water before rinsing can reduce the amount of rinsing treatment and save leaching agent;

[0034] c. Washing process: the sediment obtained a...

Embodiment 2

[0039] The remediation method of the heavy metal polluted soil of the present embodiment is as follows:

[0040] a. Soil primary screening: Spray water on the contaminated soil, and under the action of hydraulic flushing, the contaminated soil is screened through the screening device. After screening, the soil particles with a particle size of less than 0.05mm are removed (small particles of soil are difficult to be washed clean, so they are collected uniformly and processed by other methods) to obtain soil slurry with a water content of 60-70wt%.

[0041] b. Separation of sand and water: the soil slurry obtained in step a is separated from sand and water by using a cyclone sand-water separator. After removing the supernatant, collect the sediment, and the water content of the sediment is kept at 40wt%~50wt%. Separation of sand and water before rinsing can reduce the amount of rinsing treatment and save leaching agent;

[0042] c. Washing process: the sediment obtained after...

Embodiment 3

[0047] The remediation method of the heavy metal polluted soil of the present embodiment is as follows:

[0048] a. Soil primary screening: Spray water on the contaminated soil, and under the action of hydraulic flushing, the contaminated soil is screened through the screening device. After screening, the soil particles with a particle size of less than 0.05mm are removed (small particles of soil are difficult to be washed clean, so they are collected uniformly and processed by other methods) to obtain soil slurry with a water content of 60-70wt%.

[0049] b. Separation of sand and water: the soil slurry obtained in step a is separated from sand and water by using a cyclone sand-water separator. After removing the supernatant, collect the sediment, and the water content of the sediment is kept at 40wt%~50wt%. Separation of sand and water before rinsing can reduce the amount of rinsing treatment and save leaching agent;

[0050]c. Washing process: The sediment obtained after ...

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Abstract

The invention discloses a remediation method of heavy metal-polluted soil, wherein the remediation method comprises the following steps: Step a, primary screening of soil: spraying water to polluted soil, performing primary screening on polluted soil by a screening device under the action of hydraulic flushing, separating and removing soil particles with the particle size less than 0.05 mm after screening, and collecting residual soil slurry; Step b, sand-water separation: performing sand-water separation on the soil slurry obtained in the step a, removing supernatant, and collecting precipitate; Step c, elution: fully contacting and reacting an eluting agent with the precipitate obtained in the step b, migrating heavy metals from soil solid phase into eluting liquid phase; Step d, dehydration: dehydrating the eluted soil obtained in the step c. The remediation method of heavy metal-polluted soil can perform effective remediation on heavy metal-polluted soil.

Description

technical field [0001] The invention belongs to the field of soil pollution control in environmental protection, and in particular relates to a method for repairing heavy metal polluted soil. Background technique [0002] Soil is an important part of the ecosystem and the material basis for human survival. With the rapid growth of population and the continuous expansion of industrial production scale, the soil is increasingly polluted by heavy metals. Heavy metals in polluted soil can not only cause water pollution through migration into surface water and groundwater, which seriously affects environmental quality, but also can be absorbed by plants and enter the food chain to directly threaten human health. According to reports, my country's soil pollution is mainly heavy metal pollution, among which cadmium, mercury, lead, and arsenic pollution are the most prominent. At present, tens of thousands of hectares of land in our country are polluted by cadmium, mercury, etc. A...

Claims

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Application Information

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IPC IPC(8): B09C1/02B09C1/08
Inventor 冯国杰李淑彩吕正勇魏丽刘勇陈望明刘泽军甄胜利刘中良任贝苗竹朱湖地侯方胜王正中
Owner BEIJING GEOENVIRON ENG & TECH
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