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Method of leaching and repairing cadmium polluted coast saline soil

A technology for cadmium pollution and soil, which is applied in the field of leaching and repairing metal-contaminated soil, and can solve problems such as reducing the degree of Cd pollution

Inactive Publication Date: 2011-08-24
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the above-mentioned deficiencies existing in the prior art, and provide a method for leaching and repairing cadmium-contaminated coastal saline soil. Specific leaching technology for remediation treatment can greatly reduce the Cd pollution level of the crop root layer 30cm soil in coastal saline soil (reclamation tidal flat soil)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The remediation soil is the reclamation soil of Wanqingsha Town, Nansha District, Guangzhou City. The average content of Cd in 0-30cm surface soil was 3.24mg / kg, 30-40cm 2.4mg / kg, 40-50cm 2.65mg / kg, 50-70cm 2.93mg / kg. The purpose of remediation is to reduce the average Cd content in the root layer soil of 0-30 cm required by general crops as much as possible. Apply 13.5 tons of desulfurization by-products per hectare, divided into 2 applications on average, and mix evenly with the soil. After each application, add fresh water to soak and rinse, each water consumption is 350 cubic meters per hectare, and the repair time for each rinse is 7 days. After leaching, the average content of Cd in the 0-30cm surface soil was 2.9mg / kg, and the removal rate of Cd was 10.5%. The average content of Cd in the soil at the depth of 50-70cm increased from 2.93mg / kg to 3.42mg / kg; the average content of Cd in the soil at the depth of 40-50cm basically maintained the original level of 2....

Embodiment 2

[0023] The remediation soil is the reclamation soil of Wanqingsha Town, Nansha District, Guangzhou City. The average content of Cd in 0-30cm surface soil was 3.24mg / kg, 30-40cm 2.4mg / kg, 40-50cm 2.65mg / kg, 50-70cm 2.93mg / kg. The purpose of remediation is to reduce the average Cd content in the root layer soil of 0-30 cm required by general crops as much as possible. Apply 54 tons of desulfurization by-products per hectare, divided into 8 applications on average, and mix evenly with the soil. After each application, add fresh water to soak and rinse, each water consumption is 400 cubic meters per hectare, and the repair time for each rinse is 7 days. After washing, the average content of Cd in the 0-30cm surface soil was 2.58mg / kg, and the removal rate of Cd was 19.6%. The average content of Cd in the soil at the depth of 50-70cm increased from 2.93mg / kg to 3.77mg / kg; the average content of Cd in the soil at the depth of 40-50cm increased from 2.65mg / kg to 2.93mg / kg.

Embodiment 3

[0025] The remediation soil is the reclamation soil of Wanqingsha Town, Nansha District, Guangzhou City. The average content of Cd in 0-30cm surface soil was 3.24mg / kg, 30-40cm 2.4mg / kg, 40-50cm 2.65mg / kg, 50-70cm 2.93mg / kg. The purpose of remediation is to reduce the average Cd content in the root layer soil of 0-30 cm required by general crops as much as possible. Apply 40.5 tons of desulfurization by-products per hectare, divided into 6 applications on average, and mix evenly with the soil. After each application, add fresh water to soak and rinse, each water consumption is 400 cubic meters per hectare, and the repair time for each rinse is 8 days. After leaching, the average content of Cd in the 0-30cm surface soil was 2.67mg / kg, and the removal rate of Cd was 17.9%. The average content of Cd in the soil at the depth of 50-70cm increased from 2.93mg / kg to 3.62mg / kg; the average content of Cd in the soil at the depth of 40-50cm increased from 2.65mg / kg to 3.03mg / kg.

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Abstract

The invention discloses a leaching method for Cadmium Polluted coastal saline soil, which utilizes the calcium ion in the flue gas desulfurization to substitute the Cd in an exchange state in soil and transfers the dissolved Cd into lower layer of soil profile via freshwater leaching, then Cd is renewedly absorbed by soil colloid at the lower layer, thereby achieving soil remediation from root and providing safety protection for planting the crop. The invention has the advantages of high pollutants removal rate and less time consumption, which can not only achieve treatment of polluted soil, but also provide a new application for the solid waste from the flue gas desulfurization.

Description

technical field [0001] The invention relates to the technical field of remediation of heavy metal-contaminated soil, in particular to a method for rinsing and remediating metal-contaminated soil. Background technique [0002] The remediation of heavy metal-contaminated soil can be divided into two categories in principle: physicochemical remediation technology and phytoremediation technology. Among them, physical and chemical remediation technology includes chemical treatment methods, physical separation methods, solidification / stabilization methods, high-temperature treatment methods, etc. In terms of technology, different restoration techniques can be divided into two categories: in-situ restoration and ex-situ restoration. [0003] Chemical oxidation / reduction treatment converts pollutants in the soil into non-toxic or low-toxic compounds, or makes them form compounds with more stable chemical properties and less mobility. The disadvantage of this technology is that poll...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00B09C1/08B09C1/02
Inventor 李取生房剑红童泽军陈腾阳
Owner JINAN UNIVERSITY