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Method for restoring cadmium pollution of soil in passivation mode

A technology for remediating soil and cadmium pollution is applied in the field of passivation and remediation of soil cadmium pollution to achieve the effects of increasing soil organic matter content, improving land productivity, and increasing soil fertility

Active Publication Date: 2011-04-13
JIANGSU TIANXIANG BIO TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among the remediation technologies of heavy metal pollution in soil, some innovative remediation technologies, such as vitrification, solidification, soil flushing, and electrokinetic remediation, have developed rapidly, but these technologies are mainly used to treat soil with heavy metal pollution intensity. governance, the disadvantage of these methods is not only the high cost, but also the land can no longer be used for food production during the restoration process
Although the area of ​​heavy metal pollution in agricultural soil in my country is very large, except for a few special places, the overall pollution degree is not very serious, and has not reached the level where food production cannot be carried out. Large areas of arable land do not produce food and are dedicated to remediation of pollution. Many lands polluted by heavy metals in our country are still producing food, which also brings food security problems.

Method used

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  • Method for restoring cadmium pollution of soil in passivation mode
  • Method for restoring cadmium pollution of soil in passivation mode
  • Method for restoring cadmium pollution of soil in passivation mode

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Remediation and effects of garlic seedling residues, rapeseed residues and corn stalks on heavy metal cadmium (Cd) polluted soil:

[0033] 1. Test materials and methods

[0034] (1) Soil treatment:

[0035] Pass the soil through a 1mm sieve (for chemical extraction test), and set the soil cadmium pollution level to 2mg.kg -1 Cd, 5mg.kg -1 , Balanced culture aging, about one month.

[0036] (2) Preparation of passivation material:

[0037] a. Fresh plant residues: Garlic seedlings, rapeseed, and corn stalks are crushed into residues less than 1 cm in length.

[0038] b. Garlic seedlings and rapeseed samples were dried at 75°C and garlic seedlings and rapeseed were naturally air-dried at 28°C, and the air-dried samples were ground and passed through a 20-mesh sieve.

[0039] (3) Method:

[0040] Weigh 2.0g, 2mg.kg -1 Cd soil, add 0.02g of fresh plant residue, the dry matter content of the added air-dried sample and the dried sample is the same as the dry matter con...

Embodiment 2

[0051] Effects of garlic seedling residues, rapeseed residues and corn stalks on cadmium content in seedlings of crops grown in heavy metal cadmium (Cd)-contaminated soil under indoor pot passivation test conditions:

[0052] (1) Test soil: brown fluvo-aquic soil from Beijing Changping Experimental Station, passed through a 2mm sieve. Set soil cadmium pollution level to 2mg.kg -1 Cd, 5mg.kg -1 , balanced culture aging, about one month;

[0053] (2) Type selection of passivating agent for testing: garlic seedling residue, corn stalk;

[0054] (3) selection of test plant species: cucumber

[0055] (4) Method: the addition amount of garlic seedling residue and corn stalk (fresh sample) is set to 0.1%, 0.4%, 1% (weight percentage of soil). The above-ground organisms were harvested after 6 weeks of growth, and their biomass (average plant weight) was measured. Kill at 105°C, dry at 75°C, grind, weigh about 0.5g, digest with concentrated HNO3, and measure the Cd content in the ...

Embodiment 3

[0060] Remediation and effects of mustard residues, cabbage residues, green onion residues, and leek residues (all fresh plant residues) on soil contaminated by heavy metal cadmium (Cd):

[0061] Processing method is identical with the method for embodiment 1. The test results show that the above four plant residues have a good effect on the remediation of cadmium pollution in the soil. After 56 days, the reduction of available cadmium in the soil is more than 20%, which has a good remediation effect on soil cadmium pollution.

[0062] In the implementation example of the present invention, garlic, scallions, and leeks belong to Liliaceae plants, and the residues are rich in organic sulfur. The plant residues in the present invention are rich in sulfhydryls, which means that the sulfhydryl content (dry weight) in the plant residues reaches more than 2.0%. , the content of mercapto groups (dry weight) in the residue of garlic seedlings reaches (4.44±0.11)%. There will be a pung...

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Abstract

The invention relates to a method for improving soil, in particular to a method for restoring cadmium pollution of soil in a passivation mode. The method is to add plant residue rich in sulfydryl in the soil and mainly comprises the following steps of: 1, grinding the plant residue rich in the sulfydryl to ensure that the length of the residue is less than 10cm; 2, adding the plant residue obtained in the step 1 into the soil to be restored and mixing the residue and the soil, wherein the weight part ratio of the soil to be restored to the plant residue of fresh plant is 1:0.001; and 3, ensuring that the moisture content of the soil added with the plant residue is maintained over 50 percent of the maximum field moisture capacity within 20 to 40 days, wherein the plant residue rich in the sulfydryl is cruciferae plant residue or liliaceae plant residue. Compared with the prior art, the method has the advantages of environmental friendliness, low restoring cost, no influence on farmlandproduction, and improvement on soil fertility, content of soil organic matter and land productivity.

Description

technical field [0001] The invention relates to a method for improving soil, in particular to a method for passivating and repairing cadmium pollution in soil. Background technique [0002] At present, the quality and safety of agricultural products in our country have attracted more and more attention from the society. Soil heavy metal pollution is a major source of unsafe agricultural products. At present, more than 300 million mu of soil has been polluted by heavy metals in my country, and 12 million tons of grain are polluted by heavy metals every year, causing direct economic losses of more than 20 billion yuan. Among the remediation technologies of heavy metal pollution in soil, some innovative remediation technologies, such as vitrification, solidification, soil flushing, and electrokinetic remediation, have developed rapidly, but these technologies are mainly used for remediation of heavy metal-polluted soils. The disadvantage of these methods is that not only the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00B09C1/10
Inventor 马义兵罗磊韦东普
Owner JIANGSU TIANXIANG BIO TECH
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