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Method for in-situ remediation of heavy metal-contaminated soil

A technology for polluted soil and in-situ remediation, applied in the field of land engineering, to achieve the effects of short stabilization time, low cost and significant stabilization effect of heavy metals in soil

Active Publication Date: 2016-05-18
ENVIRONMENTAL PROTECTION RES INST OF LIGHT IND
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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 provide a method for in-situ remediation of heavy metal-contaminated soil in view of the deficiencies in existing in-situ remediation technology for heavy metal-contaminated soil in farmland, especially the deficiencies in the stabilizer dosing method and stabilization mode.

Method used

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  • Method for in-situ remediation of heavy metal-contaminated soil

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Embodiment 1 in-situ remediation method of heavy metal polluted soil

[0026] In December 2013, a test was carried out on farmland polluted by heavy metals from the lead-zinc mine in Xiasi Village, Xinpo Town, Longhua District, Haikou City, Hainan Province. The soil pollution status of the restored farmland in this test is shown in Table 1. Comparing with the soil environmental quality standard GB15618-1995, the test soil A area in this test is the second-class soil; B area and C area are the third-class soil.

[0027] Table 1 Types of soils for testing

[0028] Test plot number

Test soil pollution type and degree

Cd

Pb

pH value

Area A

Natural farmland soil (no pollution)

0.45

38.76

5.8

Area B

Low concentration (Cd, Pb polluted farmland)

2.59

206.42

6.1

Area C

High concentration (Cd, Pb polluted farmland)

19.61

804.69

6.0

[0029] The method provided in this embodiment inc...

Embodiment 2

[0036] The method of embodiment 2 in-situ remediation heavy metal polluted soil

[0037] In this experiment, the heavy metal low-concentration soil B was applied, and the amount of stabilizer used was 1.5%. Setting A was natural pollution-free farmland soil treatment, B0 was low-concentration polluted soil (without adding stabilizer), and B1 was low-concentration polluted soil (applied 1.5% stabilizer, rotary tillage 2 times) treatment, B2 low-concentration contaminated soil (1.5% stabilizer, 3 times rotary tillage) treatment and so on set up 4 plots in total, see Table 2 for details. At the same time, the experiment was arranged, and the water spinach was planted at the same time, and the water spinach samples were collected at the same time for vegetable sample collection, and the heavy metal detection and analysis of the fresh vegetable samples (edible parts of the water spinach) were carried out in the same batch.

[0038] Table 2 Influence of the times of rotary tillage o...

Embodiment 3

[0042] The effect of embodiment 3 in situ remediation of heavy metal polluted soil

[0043] In this experiment, the heavy metal low-concentration soil C area was applied, and the amount of stabilizer used was 2.5%. Setting A was natural pollution-free farmland soil treatment, C0 was high-concentration polluted soil (no stabilizer) treatment, C1 low-concentration polluted soil (applied 2.5% stabilizer, rotary tillage 2 times) treatment, C2 low-concentration contaminated soil (2.5% stabilizer, 3 times rotary tillage) treatment and so on set up 4 plots in total, see Table 3 for details. At the same time, arrange the test, plant water spinach at the same time, collect water spinach samples for vegetable sample collection, and carry out heavy metal detection and analysis of fresh vegetable samples (edible parts of water spinach) in the same batch.

[0044] Table 3 The effect of rotary tillage times on the stabilization effect of compound polluted soil with high concentration of Pb ...

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Abstract

The invention provides a method for remediating heavy metal contaminated soil in situ. The method comprises the steps of applying and spreading a stabilizing agent on the surface of to-be-remediated soil, and carrying out rotary tillage and mixing in a dry-wet alternating mode for at least three times so as to remediate the heavy metal contaminated soil. The method is suitable for being applied to the governance of stabilized remediation of farmland heavy metal soil. The stabilizing agent applying and spreading technology is simple and feasible, low in cost, short in stabilizing time of soil heavy metal, and obvious in stabilizing effect of soil heavy metal; soil remediated by the technology can be directly used, and the heavy metal content of vegetable crops planted in the stabilized soil meets the national standard.

Description

technical field [0001] The invention belongs to the field of land engineering, and in particular relates to a method for in-situ restoration of heavy metal polluted soil. Background technique [0002] Soil is the fertile, loose layer of land on which plants can grow. Soil not only provides mechanical support for plant growth, but also provides fertility elements such as water, fertilizer, air, and heat for plant growth and development. Its formation is an extremely long natural ecological process, so the protection of soil resources is very important. Due to the rapid growth of population and the rapid development of industry, solid wastes are continuously stacked and dumped on the soil surface, and harmful waste water is continuously infiltrated into the soil, resulting in soil pollution. It not only hinders the normal function of the soil, reduces the yield and quality of crops, but also indirectly affects human health through food, vegetables, and fruits. [0003] Heavy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08
Inventor 刘永兵李翔程言君张建中梁爽赵从举
Owner ENVIRONMENTAL PROTECTION RES INST OF LIGHT IND
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