Method for restoration of heavy metal-polluted soil in rice farmland

A pollution remediation and heavy metal technology, applied in the field of heavy metal pollution remediation in rice farmland, can solve the problems of destroying soil organic matter structure, reducing soil heavy metal content, and changing farmland soil properties.

Active Publication Date: 2019-12-10
珠海市安能环保科技有限公司
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Problems solved by technology

[0002] Existing chemical remediation technologies mainly include 1. Ex-situ chemical leaching method - for soil heavily polluted by heavy metals in farmland, the soil is dug out first, and then the heavy metals are removed by large-scale spray chemical washing methods, and then the soil is backfilled in situ , this method involves high cost due to transportation and other methods, and the original organic matter structure of the soil will be destroyed after the soil is chemically washed, which will greatly change the properties of the farmland soil
2. In-

Method used

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  • Method for restoration of heavy metal-polluted soil in rice farmland

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0025] Example 1

[0026] A method for remediation of heavy metal pollution in rice farmland, including the following steps: Step S1: preparation of a medicament, which mainly includes the following components, in parts by weight, 70 to 90 parts of water, 0.5 to 2.5 parts of natural polymer sodium alginate, and diatoms 2.5~4.5 parts of soil, 4~8 parts of polyvinyl alcohol solution, 1~3 parts of calcium chloride solution, 0.5~2.5 parts of glutaraldehyde solution, organic-inorganic hybrid composite hydrogel microspheres were prepared by static instillation , That is, adsorbed drug particles;

[0027] Step S2: Put the adsorbent particles made in step S1 into the adsorption ball. The adsorption ball is a plastic ball with a hollow structure and a through hole on the surface. The diameter of the adsorption ball is 40-60 mm. Packed in the medicine bag, the medicine bag is a nylon filter bag with a sealing rope, the length of the medicine bag is 40-60mm, and the width is 15-22mm. The hea...

Example Embodiment

[0034] Example 2

[0035] The technical scheme of Example 2 is basically the same as that of Example 1, but the difference is that for the rice farmland with light heavy metal pollution, each adsorption ball is filled with 40g of adsorbent particles; the rice farmland with moderate heavy metal pollution , Each adsorption ball is filled with 60g adsorption drug particles; for heavy metal polluted rice farmland, each adsorption ball is filled with 90g adsorption drug particles, and each rice seedling is equipped with a heavy metal adsorption device. When in use, the heavy metal adsorption device is implanted in the mud until it is just buried, and a 20mm water layer is maintained on the surface of the paddy field in the early stage of rice growth.

[0036] After a field trial comparison, it was found that for heavily polluted rice fields, after 3 to 4 restorations, the inspection of agricultural products meets national standards. For lightly polluted rice fields, after the first use...

Example Embodiment

[0037] Example 3

[0038] The technical scheme of Example 3 is basically the same as that of Example 1, and the difference is: in Example 3, for the rice farmland with light heavy metal pollution, each adsorption ball is filled with 50g of adsorbent particles; the rice farmland with moderate heavy metal pollution , Each adsorption ball is filled with 70g adsorption drug particles; for heavy metal polluted rice farmland, each adsorption ball is filled with 100g adsorption drug particles, and each rice seedling is equipped with a heavy metal adsorption device. When in use, the heavy metal adsorption device is implanted in the mud until it is just buried, and a 30mm water layer is maintained on the surface of the paddy field in the early stage of rice growth.

[0039] After a field trial comparison, it was found that for heavily polluted rice fields, after 2 to 3 restorations, the inspection of agricultural products meets national standards. For lightly polluted rice fields, after th...

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Abstract

The invention discloses a method for restoration of heavy metal-polluted soil in rice farmland, and belongs to the field of heavy metal treatment technologies of farmlands. The method includes the following steps: (1) preparing a reagent; (2) packing the reagent prepared in the step (1) into adsorption balls, and packing the adsorption balls into a chemical bag so as to obtain a heavy metal adsorption device; (3) burying the heavy metal adsorption device obtained in the step (2) into mud until being just buried when rice seedlings are planted; (4) recovering the reagent, and taking the heavy metal adsorption device out of the soil when rice is harvested; and (5) drying the adsorption reagent particles obtained in the step (4) in the sun until complete dryness so as to realize recycling ofwaste resources. A diatomaceous earth component is added to the reagent so that the reagent has a good adsorption effect, an in-situ restoration method is adopted, heavy metal can be separated from the farmland soil through the adsorption reagent particles, and the adsorption reagent particles along with crops can be taken out of the farmland soil in the crop harvest season, so that the problem ofhard treatment of heavy metal-polluted farmland soil is solved, and the original organic structure of the soil is not damaged.

Description

technical field [0001] The invention belongs to the technical field of heavy metal treatment in farmland, and in particular relates to a method for repairing heavy metal pollution in rice farmland. Background technique [0002] Existing chemical remediation technologies mainly include 1. Ex-situ chemical leaching method - for soil heavily polluted by heavy metals in farmland, the soil is dug out first, and then the heavy metals are removed by large-scale spray chemical washing methods, and then the soil is backfilled in situ , this method involves high cost due to transportation and other methods, and the original organic matter structure of the soil will be destroyed after the soil is chemically washed, which will greatly change the properties of the farmland soil. 2. In-situ solidification / passivation method - the use of solidification passivation materials for heavy metal pollutants in farmland can reduce the activity of heavy metals in the soil, without affecting the gro...

Claims

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Application Information

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IPC IPC(8): B09C1/08
CPCB09C1/08B09C2101/00
Inventor 狄旭东张鹏王素花
Owner 珠海市安能环保科技有限公司
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