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Restoration method for cadmium-contaminated rice field

A remediation method and technology for cadmium pollution are applied in the field of restoration of cadmium-contaminated paddy fields, which can solve problems such as unsatisfactory effects, and achieve the effects of increasing the removal rate of cadmium and the enrichment rate.

Inactive Publication Date: 2017-02-22
HUNAN UNIV OF SCI & ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are methods of using Sedum sedum alone, applying biochar or combining with other substances to repair heavy metal polluted soil, but the effect is not very satisfactory

Method used

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  • Restoration method for cadmium-contaminated rice field
  • Restoration method for cadmium-contaminated rice field
  • Restoration method for cadmium-contaminated rice field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for remediating rice field cadmium pollution, carried out according to the following steps:

[0023] (1) Planting sedum with ore in cadmium-contaminated paddy fields;

[0024] (2) After reaching a certain growth period, remove the sedum with ore;

[0025] (3) Planting rice;

[0026] (4) Applying biochar to the paddy field when the rice reaches a certain growth period;

[0027] (5) Steps (1), (2), (3) and (4) are repeated in sequence.

[0028] In described step (1), the ridge width of Sedum sedum planted with mine is 1.0m, the plant row spacing is 0.2m, and the plant spacing is 0.10m, and every ridge is planted with 3 rows, and the fertilization rate is available nitrogen 150mg / kg, and available phosphorus 20mg / kg , available potassium 80mg / kg.

[0029] The growth period of Sedum accompaniment is selected in 130 days in the described step (2).

[0030] The growth stage of rice in the step (3) is the booting stage.

[0031] The biochar in the step (4) is ra...

Embodiment 2

[0037] A method for remediating rice field cadmium pollution, carried out according to the following steps:

[0038] (1) Planting sedum with ore in cadmium-contaminated paddy fields;

[0039] (2) After reaching a certain growth period, remove the sedum with ore;

[0040] (3) Planting rice;

[0041] (4) Applying biochar to the paddy field when the rice reaches a certain growth period;

[0042] (5) Steps (1), (2), (3) and (4) are repeated in sequence.

[0043] In described step (1), the ridge width of Sedum sedum planted with mine is 1.0m, the plant row spacing is 0.2m, and the plant spacing is 0.10m, and every ridge is planted with 3 rows, and the fertilization rate is available nitrogen 150mg / kg, and available phosphorus 20mg / kg , available potassium 80mg / kg.

[0044] The growth period of Sedum accompaniment is selected in 160 days in the described step (2).

[0045] The growth period of rice in the described step (3) is the turning green period.

[0046] The biochar in ...

Embodiment 3

[0052] A method for remediating rice field cadmium pollution, carried out according to the following steps:

[0053] (1) Planting sedum with ore in cadmium-contaminated paddy fields;

[0054] (2) After reaching a certain growth period, remove the sedum with ore;

[0055] (3) Planting rice;

[0056] (4) Applying biochar to the paddy field when the rice reaches a certain growth period;

[0057] (5) Steps (1), (2), (3) and (4) are repeated in sequence.

[0058] In described step (1), the ridge width of Sedum sedum planted with mine is 1.0m, the plant row spacing is 0.2m, and the plant spacing is 0.10m, and every ridge is planted with 3 rows, and the fertilization rate is available nitrogen 150mg / kg, and available phosphorus 20mg / kg , available potassium 80mg / kg.

[0059] The growth period of Sedum accompaniment is selected in 160 days in the described step (2).

[0060] The growth period of rice in the step (3) is the fruiting period.

[0061] The biochar in the step (4) is...

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Abstract

The invention belongs to the field of heavy-metal-contaminated soil restoration and discloses a restoration method for a cadmium-contaminated rice field. The restoration method comprises the steps of planting sedum plumbizincicola in the cadmium-contaminated rice field; after a certain growing period is reached, removing the sedum plumbizincicola, and then planting rice; when the rice reaches a certain growing period, applying biochar to the rice field; after the rice is harvested, detecting the content of cadmium in the rice field and the content of cadmium in rice grains; and if the content of cadmium is still high, repeating the above procedures to conduct circulatory planting till the content of cadmium is qualified. By means of the restoration method for the cadmium-contaminated rice field, the cadmium enrichment ratio of the sedum plumbizincicola is greatly increased, and through solidification of the biochar, the cadmium removal rate of the rice field is increased.

Description

technical field [0001] The invention relates to a method for remediating soil polluted by heavy metals, in particular to a method for remediating cadmium-contaminated paddy fields. Background technique [0002] Soil pollution is a kind of farmland pollution. Due to extensive management in developing countries, the sewage containing heavy metals discharged from factories pollutes farmland and is difficult to remove. It has become a global environmental problem. Rice is one of the main food crops in the world. During the growth process of rice, if the soil contains heavy metal salts, the rice seeds will accumulate at a high level, which will endanger human health after eating. Cadmium (Cd) is an important raw material in industry. Cadmium (Cd) in sewage is difficult to treat. It is discharged into rivers or underground in industry, and farmers' agricultural water is irrigated into rice fields, causing heavy metal cadmium in rice fields. [0003] Sedum with ore is a new type o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/10B09C1/00
CPCB09C1/105B09C1/00B09C2101/00
Inventor 刘小文何福林胡克坚袁志辉盘俊廖海兵蒋琼凤齐成媚刘晓霞
Owner HUNAN UNIV OF SCI & ENG
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