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Remediation agent for lead-cadmium-chromium contaminated soil and remediation method for lead-cadmium-chromium contaminated soil

A technology of contaminated soil and remediation method, which is applied in the field of lead, cadmium and chromium contaminated soil remediation agent and remediation, which can solve the problems of low stability and low efficiency of remediation effect, and achieve the effect of fast repair speed, simple operation and reduced repair cost

Inactive Publication Date: 2021-11-30
DALIAN MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides a lead, cadmium and chromium contaminated soil remediation agent and a remediation method to solve the problems of low stability and low efficiency of the remediation effect of lead, cadmium and chromium contaminated soil remediation in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The soil with a lead content of 900mg / kg is fully mixed with the restoration agent at a mass ratio of 10:3, and the composition of the restoration agent is magnesium oxide (10% by mass), calcium dihydrogen phosphate (5% by mass), montmorillonite, Kaolinite, goethite, olivine (70% by mass), allophane and gibbsite (15% by mass), add tap water 4 to 10 times the mass of the soil, and place the mixed components in a cool place Air-dry in a ventilated place for 3-5 days, fully stir the components every day to ensure that each mixed component and tap water can fully contact and react. When the soil is fully air-dried and no white solid appears, the soil restoration process is basically completed. Sampling and testing the contaminated soil after remediation, the lead concentration is 900mg / kg, the leaching toxicity concentration of the contaminated soil is 3.08mg / L, the leaching toxicity after remediation is 1.47mg / L, and the stability efficiency is 55.27%. Among them, the metal...

Embodiment 2

[0020] The soil with a lead content of 900mg / kg is fully mixed with the restoration agent at a mass ratio of 10:3, and the composition of the restoration agent is magnesium oxide (20% by mass), calcium oxide (50% by mass), calcium dihydrogen phosphate (50% by mass) 10%), talc (5% by mass), montmorillonite and allophane (5% by mass), kaolinite, halloysite, montmorillonite, hydromica, sea Chlorite and chlorite (10% by mass), add tap water with 4 to 10 times the mass of the soil, place the mixed components in a cool and ventilated place to air dry for 3 to 5 days, and fully stir the components every day to ensure that each The mixed components and tap water can fully contact and react. When the soil is fully air-dried and no white solid appears, the soil restoration process is basically completed. Sampling and testing the contaminated soil after remediation showed that the lead concentration was 900 mg / kg, the leaching toxicity concentration of the contaminated soil was 3.08 mg / L...

Embodiment 3

[0022] The soil with a lead content of 2600mg / kg is fully mixed with the restoration agent at a mass ratio of 10:3. The composition of the restoration agent is magnesium oxide (10% by mass), calcium dihydrogen phosphate (5% by mass), montmorillonite, Kaolinite, goethite, olivine (70% by mass), allophane and gibbsite (15% by mass), add tap water 4 to 10 times the mass of the soil, and place the mixed components in a cool place Air-dry in a ventilated place for 3-5 days, fully stir the components every day to ensure that each mixed component and tap water can fully contact and react. When the soil is fully air-dried and no white solid appears, the soil restoration process is basically completed. Sampling and detection of contaminated soil after remediation shows that the lead concentration is 2600mg / kg, the leaching toxicity concentration of the contaminated soil is 15.57mg / L, the leaching toxicity concentration of the soil after remediation is 5.47mg / L, and the stability efficie...

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PUM

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Abstract

The invention discloses a remediation agent for lead-cadmium-chromium contaminated soil and a remediation method for the lead-cadmium-chromium contaminated soil. The remediation agent comprises the following components in percentage by mass: 10%-30% of magnesium oxide, 5%-20% of dihydric phosphate, 10%-75% of crystalline clay mineral and 10%-40% of an amorphous clay mineral. The remediation method comprises the steps that the remediation agent and the lead-cadmium-chromium contaminated soil are mixed and stirred for 30-60 min so as to obtain mixed soil; and water with a mass 3-10 times the mass of the contaminated soil is added, the water content of the mixed soil is kept, and maintenance is conducted for 3-5 days. The remediation agent provided by the invention can improve the form stability of lead, cadmium and chromium in soil and reduce a metal toxicity leaching concentration, has high efficiency, is reduced in use amount, lowers the remediation cost to the maximum extent, and can be applied to the field of treatment and remediation of lead-cadmium-chromium contaminated soil.

Description

technical field [0001] The invention relates to the technical field of soil pollution restoration, in particular to a lead, cadmium and chromium contaminated soil restoration agent and a restoration method. Background technique [0002] Soil heavy metal pollution control methods include physical engineering measures, biological measures, agricultural measures, chemical remediation, etc. Chemical remediation mainly includes chemical leaching method and chemical curing-stabilization method. Although leaching agent has a good repair effect, it will cause the loss of soil physical and chemical properties and soil matrix, which will have a great impact on cultivation, and subsequent leaching The treatment of the lotion is also a problem that needs to be considered, and the chemical curing-stabilization method is to add curing agents, organic matter, chemical reagents, etc. to the soil, through adsorption, redox, antagonism, complexation or precipitation, etc., to convert heavy me...

Claims

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Application Information

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IPC IPC(8): C09K17/08B09C1/08
CPCC09K17/08B09C1/08
Inventor 朱益民于航刘晓楠孟凡超曹雨徽赵娇
Owner DALIAN MARITIME UNIVERSITY
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