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Method for restoring cadmium-polluted cultivated land by applying attapulgite materials

A technology of cadmium pollution and soil pollution, applied in the restoration of polluted soil, etc., can solve problems such as polluted soil, achieve the effect of alleviating grain Cd pollution and improving environmental quality

Active Publication Date: 2016-03-23
JIANGSU GEOLOGICAL SURVEY INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The present invention aims at the prevention and control of Cd pollution in arable land, specifically, the Cd content of farmland soil reaches the pollution level (soil Cd reaches the pollution level above medium level), and the Cd content of rice exceeds the national limit standard, but rice production cannot be given up, and the research and development ensures the safety of rice production ( To ensure that most of the Cd in rice meets the technical problem of the national food standard), the invention provides a method for applying attapulgite materials to restore cadmium pollution in cultivated land, which belongs to one of the in-situ passivation repair technologies for soil heavy metal pollution, and has low cost, easy operation Simple, quick effect, strong practicability, etc.; especially, it can solve the problem of remediation of Cd-contaminated soil in actual farmland

Method used

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  • Method for restoring cadmium-polluted cultivated land by applying attapulgite materials
  • Method for restoring cadmium-polluted cultivated land by applying attapulgite materials
  • Method for restoring cadmium-polluted cultivated land by applying attapulgite materials

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Remediation experiment of Yinjia wheat Cd contaminated land in Shuangqiao Village, Dingshu Town, Yixing City, Jiangsu Province

[0042] Yin’s family in Shuangqiao Village, Dingshu Town, Yixing City, Jiangsu Province rented a piece of cultivated land with a length of 64 meters and an average width of about 5 meters for a repair test with attapulgite. The use of the cultivated land and normal grain production were not changed during the test.

[0043] A method for applying attapulgite materials to repair cadmium pollution in cultivated land, the steps of which are as follows: through preliminary evaluation, it is determined that the Cd content of the above-mentioned field soil is between 1.8-5.5 mg / kg and the pH is between 5.5-6.3, and the Cd content of wheat grains produced before restoration is The content is all greater than 0.6mg / kg, reaching the level of severe pollution; the survey of the soil sediment profile determined that the contaminated thickness of the cultiva...

Embodiment 2

[0046] Remediation experiment of rice Cd contaminated land in Yinjia, Shuangqiao Village, Dingshu Town, Yixing City, Jiangsu Province

[0047] In the same Cd-contaminated cultivated land mentioned above, attapulgite was applied to the soil after wheat was harvested, and a field restoration experiment was carried out for sowing rice. The attapulgite repairing materials used in the test are the same as those in the above-mentioned Example 1, and processes such as field arrangement, cultivation, fertilization, and irrigation of cultivated land have also been carried out according to the rice seeding procedure, and the attapulgite repairing materials are applied by setting a blank control group and a treatment group. The treatment group set 8 parallels. Atmospheric soil was not applied to the blank group, and 1.5kg / m2 was applied to the treatment group 2 Apply attapulgite at a dosage of 2 times, 750 grams per square meter when sowing, and 750 grams per square meter when earing, t...

Embodiment 3

[0051] Contrastive remediation experiment of multi-field plots with different application amounts of attapulgite for rice Cd-contaminated land

[0052] In 2014, 5 pieces of Cd-contaminated cultivated land were rented at Yin’s house in Shuangqiao Village, Dingshu Town, Yixing City, Jiangsu Province at the same time to carry out remediation tests with different dosages of attapulgite. Compared.

[0053] The Cd content of the rented cultivated land soil is all above 1.5mg / kg, and the soil pH value is all less than 6.3, which belongs to the same pollution source as the test sites rented in Examples 1 and 2 above, and is separated from the above test sites by no more than 100 meters . The doses of attapulgite applied to the 5 contaminated farmlands are: 1.25kg / m 2 , the test field area is 1000m 2 , accumulative application of attapulgite 1250kg, one-time application before rice sowing; 1.75kg / m 2 , the test field area is 800m 2 , A total of 1400kg of attapulgite is applied, 90...

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Abstract

The invention discloses a method for restoring cadmium-polluted cultivated land by applying attapulgite materials and belongs to the technical field of cultivated land cadmium pollution treatment. The method comprises the following steps: 1, screening out the cadmium-polluted cultivated land; 2, measuring the soil pollution depth, the pH value, the cation exchange capacity and the like of the selected cadmium-polluted cultivated land, and calculating the earth volume of the cultivated land to be restored and the use quantity of the attapulgite materials which are prepared to be applied; 3, conducting cultivation on the cadmium-polluted cultivated land which is selected to be used for restoration tests, sowing paddy rice and wheat separately according to the timing sequence, applying the attapulgite materials before the paddy rice is sown, before paddy rice ears emerge and before the wheat is sown, conducting uniform sowing and application each time, and reserving vacant land for test result comparison; the pH value of the attapulgite materials is greater than 7.5, the grain size of each attapulgite material is smaller than 80 meshes, the cadmium content of the land is less than 0.15 mg / kg, and attapulgite CEC is greater than 250 mmol / kg. The method has the advantages of being low in cost, easy to operate, quick in effectiveness, great in practicability and the like; in particular, the problem of restoring cadmium-polluted soil in actual farmland can be solved.

Description

technical field [0001] The present invention relates to the cadmium pollution treatment technology of cultivated land, in particular to a method for applying attapulgite materials to restore cadmium pollution in cultivated land, and a practical passivation technology for regulating the absorption of cadmium in cultivated land soil by applying attapulgite materials, especially for field restoration Cadmium pollution, including the specific test process and field test results, is of great help to the prevention and control of heavy metal pollution such as cadmium in cultivated land in my country. Background technique [0002] The situation of heavy metal pollution in cultivated land soil in my country is severe, and the harm caused by Cd pollution is the most obvious. At present, there is an urgent need for practical technologies for the prevention and control of cultivated land polluted by heavy metals such as Cd. In April 2014, the "National Soil Pollution Survey Bulletin" jo...

Claims

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Application Information

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IPC IPC(8): B09C1/08
CPCB09C1/08B09C2101/00
Inventor 廖启林朱伯万任静华金洋华明常青
Owner JIANGSU GEOLOGICAL SURVEY INST
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