Composite passivator for restoring heavy metal cadmium contaminated soil and application method thereof

A technology for cadmium-contaminated soil and heavy metals, which is applied in the field of contaminated soil remediation, can solve problems such as cadmium pollution, and achieves the effects of convenient use, wide source of raw materials, and increasing the effect of soil nutrients.

Inactive Publication Date: 2013-08-14
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although some studies have shown that the content of heavy metals in soil increases with the increase of vegetable planting years, while the ...

Method used

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  • Composite passivator for restoring heavy metal cadmium contaminated soil and application method thereof
  • Composite passivator for restoring heavy metal cadmium contaminated soil and application method thereof
  • Composite passivator for restoring heavy metal cadmium contaminated soil and application method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Field test of in-situ passivation: In this example, a field plot test is used to study the effect of the present invention on the passivation effect of the available state of cadmium in the water spinach vegetable soil and the influence of the vegetables on absorbing and accumulating cadmium. The basic properties of the tested soils are shown in Table 1 below.

[0024]

[0025] In the field test, test plots were set up on the cadmium-contaminated vegetable ground, each plot was about 3m 2 (1m x 3m). The test set 4 groups of experiments, the ratio of calcium magnesium phosphate fertilizer and peat charcoal in the composite passivator for repairing heavy metal cadmium polluted soil is shown in Table 2, the first group is used as a blank control group, repeated 6 times, and the data results are averaged , Groups 2-4 were repeated 3 times, and the data results were averaged, with a total of 15 planting units.

[0026]

[0027] Apply the compound passivating agent wi...

Embodiment 2

[0032] Field test of in-situ passivation: the present embodiment adopts field test to study the effect of the present invention on the passivation effect of cadmium available state in eggplant and vegetable soil and the influence of vegetable absorption and accumulation of cadmium. The basic properties of the test soil are shown in Table 1. .

[0033] In the field test, test plots were set up on the cadmium-contaminated vegetable ground, each plot was about 3m 2 (1m x 3m). The test set 4 groups of experiments, the ratio of calcium magnesium phosphate fertilizer and peat charcoal in the composite passivator for repairing heavy metal cadmium polluted soil is shown in Table 4, the first group is used as a blank control group, repeated 6 times, the second-fourth group Repeat 3 times for a total of 15 planting units.

[0034]

[0035] Apply the compound passivating agent with different ratios above to the vegetable field polluted by heavy metal cadmium according to the ratio o...

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Abstract

The invention discloses a composite passivator for restoring heavy metal cadmium contaminated soil, which comprises the following components in percentage by weight: 25.0-75.0% of a calcium magnesium phosphate fertilizer and 25.0-75.0% of turf. The composite passivator for restoring heavy metal cadmium contaminated soil disclosed by the invention can significantly reduce the effective state cadmium content of soil and the cadmium content of vegetables, and also can increase the pH value of soil; the composite passivator is used for controlling wide heavy metal cadmium contaminated vegetable soil; and by using the passivator, the heavy metal cadmium content of vegetable products is lower than a national food safety standard value, therefore, the passivator is of great significance to the guarantee of food safety, and has a board application prospect.

Description

technical field [0001] The invention belongs to the technical field of remediation of polluted soil, and more specifically relates to a composite passivator for remediating soil polluted by heavy metal cadmium and an application method thereof. Background technique [0002] Due to the rapid development of industry, the problem of soil pollution by heavy metal cadmium has been paid attention to by all countries in the world, and the problem of cadmium pollution in my country is particularly prominent. Heavy metal pollution is one of the most widely polluted and most harmful environmental problems today. According to incomplete statistics, the area of ​​heavy metal polluted cultivated land in my country is nearly 2.0×108hm 2 , accounting for about 1 / 5 of the total cultivated land area, of which the cultivated land area polluted by cadmium is 1.33×l04hm 2 , involving 25 regions in 11 provinces. Cadmium pollution in rice field soil not only affects the growth, grain yield and ...

Claims

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Application Information

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IPC IPC(8): C09K17/40
Inventor 李晔王涌泉李柏林张譞刘曦胡进
Owner WUHAN UNIV OF TECH
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