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In situ passivation remediation method of cadmium-contaminated paddy soil

A remediation method and technology for cadmium pollution, applied in the field of paddy soil remediation, can solve problems such as poor chemical stability and secondary pollution costs, and achieve the effects of strong sustainability, improvement of soil fertility, and significant solidification/stabilization.

Active Publication Date: 2018-01-26
HUNAN MORDEN ENVIRONMENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art, especially to provide a drug with good stability, no secondary In-situ passivation remediation method for secondary pollution and low cost of cadmium-contaminated paddy soil

Method used

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  • In situ passivation remediation method of cadmium-contaminated paddy soil

Examples

Experimental program
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Effect test

Embodiment 1

[0027] An in-situ passivation restoration method for cadmium-contaminated paddy field soil of the present invention is used in a pot plant test on moderately and lightly polluted soil in Changsha County.

[0028] Soil for testing: collected from the 0-20cm plow layer soil in a town in Changsha County, Hunan Province. The physical and chemical properties of the soil are listed in Table 1.

[0029] Table 1 Basic physical and chemical properties of lightly polluted potting soil in Changsha County

[0030]

[0031] Note: The effective state extraction method of heavy metals is ammonium nitrate extraction method.

[0032] The rice variety tested in the experiment was Xiangwan Indica 13, which is suitable for planting in Hunan.

[0033] The test added multi-effect cadmium passivator as passivation conditioner for moderately and lightly polluted soil in Changsha County to remediate cadmium-contaminated paddy soil, thereby reducing cadmium content in rice and increasing rice yiel...

Embodiment 2

[0055] An in-situ passivation restoration method for cadmium-contaminated paddy fields of the present invention is used for pot planting experiments on heavily polluted soil in Changning.

[0056] Soil for testing: collected from the 0-20cm plow layer soil of a town in Changning City, Hengyang City, Hunan Province. The physical and chemical properties of the soil are listed in Table 5.

[0057] Table 5 Basic physical and chemical properties of heavily polluted potting soil in Changning

[0058]

[0059] Note: The effective state extraction method of heavy metals is ammonium nitrate extraction method.

[0060] The rice variety tested in the experiment was Xiangwan Indica 13, which is suitable for planting in Hunan.

[0061] The test added multi-effect cadmium passivator as a passivation conditioner for heavily polluted soil in Changning to remediate cadmium-contaminated soil, thereby reducing the cadmium content in rice and increasing rice yield.

[0062] The in-situ pass...

Embodiment 3

[0083] An in-situ passivation restoration method for cadmium-contaminated paddy fields of the present invention is used in a demonstration field for restoration of lightly polluted cadmium-polluted paddy fields in a town in Changsha County. The main physical and chemical properties of the demonstration field soil are shown in Table 9 below.

[0084] Table 9 The main physical and chemical properties of the soil in the mildly polluted demonstration field in Changsha County

[0085]

[0086]

[0087] The rice variety tested in the experiment was Xiangwan Indica 13, which is suitable for planting in Hunan.

[0088] The demonstration field in Changsha County added a multi-effect cadmium passivator as an in-situ passivation conditioner for paddy fields to remediate cadmium-contaminated paddy soil, thereby reducing the cadmium content in rice brown rice and increasing rice yield.

[0089] The in-situ passivation repair method of the cadmium polluted paddy field of the present ...

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Abstract

The invention discloses an in-situ passivation remediation method for cadmium polluted rice soil. The method comprises the following steps that (1) a multi-effective cadmium passivator is prepared, and the multi-effective cadmium passivator is prepared by grinding and then mixing the following raw materials including, by mass, 20%-25% of sepiolite, 45%-50% of red mud and 28%-32% of peat; (2) the multi-effective cadmium passivator is scattered in the cadmium polluted rice soil and mixed with the cadmium polluted rice soil sufficiently; (3) the cadmium polluted rice soil is irrigated; and (4) rice transplanting is conducted, and the rice soil is managed according to normal rice planting procedures after rice transplanting. According to the in-situ passivation remediation method for the cadmium polluted rice soil , the adopted agent is good in stability, secondary pollution is avoided, and cost is low.

Description

technical field [0001] The invention belongs to the field of paddy field soil restoration, and in particular relates to an in-situ passivation restoration method for cadmium-contaminated paddy field soil. Background technique [0002] Hunan is the "hometown of non-ferrous metals". Among the more than 160 kinds of mineral deposits that have been discovered in the world, Hunan has more than 140 kinds, and most of them belong to poor heterogeneous strains. This makes the heavy metal pollution of farmland soil in Hunan increasingly serious, especially cadmium pollution. Rice is the main food crop in Hunan and even the whole country. However, cadmium pollution in rice fields hinders the growth and development of rice, resulting in reduced or no harvest. What is more serious is that toxic heavy metals pass through the food chain, posing a direct threat to human life and health. [0003] At present, Hunan area mainly solves the problem of cadmium pollution in paddy fields by reduci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 李慧刘艳刘朝辉卢海威黄磊
Owner HUNAN MORDEN ENVIRONMENT TECH