Method for treating farmland soil polluted by cadmium

A cadmium-contaminated soil technology, applied in the field of cadmium-contaminated farmland soil treatment, can solve the problems of long treatment cycle, many links, long process, etc., and achieve quick results, simple process and low cost

Active Publication Date: 2014-05-28
SHENZHEN WANXINDA ECOLOGICAL ENVIRONMENT CO LTD
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Agro-ecological restoration and in-situ phytoremediation are methods of continuous absorption and depletion of plants to reduce the cadmium content in the soil. Although the in-situ restoration mode has its own advantages, it also has a long treatment cycle and is effective. Disadvantages such as slow

Method used

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  • Method for treating farmland soil polluted by cadmium
  • Method for treating farmland soil polluted by cadmium

Examples

Experimental program
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Effect test

Embodiment 1

[0047] The present invention is tested for the first time in a cadmium-contaminated farmland in a certain place in Hunan. It was originally a paddy field, but it was stopped due to cadmium pollution. The area to be tested is 1500m2 2 .

[0048] The test conditions are as follows:

[0049] (1) On-site investigation of the soil conditions of cadmium-contaminated farmland, collecting soil samples at different depths, focusing on the top 30cm of soil samples, and testing the cadmium content. GB15618-2008) stipulates that the maximum allowable content of cadmium in paddy fields in agricultural land is 0.5mg / kg.

[0050] (2) According to the terrain characteristics of the treatment site and the concentration distribution of cadmium in the soil, set up a treatment unit and straighten out the water system of the treatment unit. Incoming water should avoid entering the treatment site, and reasonable anti-seepage drainage and storage facilities should be set up in the site to prevent ...

Embodiment 2

[0060] The present invention is tested on a cadmium-polluted dryland in Ganzhou, Jiangxi, and the test area is 2000m2.

[0061] The test conditions are as follows:

[0062] On-site investigation of the soil conditions of cadmium-contaminated farmland, soil samples were collected at different depths, focusing on the surface 20cm soil samples, and the cadmium content was detected and analyzed. The average reached 25.6mg / kg, seriously exceeding the standard.

[0063] The rest of the steps in this example are basically the same as those in Example 1, except that two treatment units are set, and the chemical stabilizer added to the peeled topsoil is a combination of calcium dihydrogen phosphate and ammonium phosphate mixed in equimolar quantities , on the topsoil layer (4), solanum nightshade and celestia nigra are planted respectively in the mode of crop rotation.

[0064] After planting 2 crops of Solanum nigrum and Celestia nigra, the cadmium content in the soil was lower than ...

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Abstract

The invention provides a method for treating farmland soil polluted by cadmium. The method integrates technical measurements such as seepage-proofing isolation, chemical stabilizing treatment, phytoremediation and the like, and comprises technical steps as follows: sampling detection, repairing range determination, dredging of river systems, surface soil stripping, bottom layer grinding, clay pavement, laying of a seepage-proofing isolating membrane, surface soil backfilling, addition of a chemical stabilizing agent, plant planting and harvesting, incineration and ashing, ash content stabilizing and curing treatment, terminal treatment and the like. The method for treating the farmland soil polluted by cadmium has the advantages of on-site treatment, simple process, convenience in construction, instant effect, high efficiency, low cost and the like, and is wide in popularization and application prospect.

Description

technical field [0001] The invention provides a treatment method for cadmium-contaminated farmland soil, in particular to an in-situ treatment method for cadmium-contaminated farmland soil with technical measures such as comprehensive anti-seepage isolation, chemical stabilization treatment, phytoremediation and the like. Background technique [0002] Cadmium is a non-essential element for the human body. It often exists in the form of compounds in nature, and its content is generally very low. Under normal environmental conditions, it will not affect human health. When the environment is polluted by cadmium, cadmium can be enriched in organisms and enter the human body through the food chain to cause chronic poisoning. Cadmium is highly toxic, and the air and food polluted by cadmium are seriously harmful to the human body. Japan once suffered from "bone pain disease" due to cadmium poisoning. [0003] There are many cadmium-contaminated soils in our country, resulting in ...

Claims

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Application Information

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IPC IPC(8): B09C1/00
Inventor 朱兆华曹华英徐国钢刘杰刘英董沁陈晓蓉孙吉雄
Owner SHENZHEN WANXINDA ECOLOGICAL ENVIRONMENT CO LTD
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