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Cadmium polluted soil repairing agent as well as preparation method and application thereof

A technology for cadmium-contaminated soil and a remediation agent, applied in the field of pollution treatment, can solve the problems of soil structure damage, loss of nutrient elements, and high treatment costs, and achieve the effects of restoring soil fertility, reducing leaching rate, and improving ecological environment.

Inactive Publication Date: 2017-02-22
产俊涛
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, cadmium-contaminated soil treatment technologies mainly include immobilization / stabilization, leaching, soil washing, electrokinetic remediation, chemical reduction, phytoremediation, and microbial remediation, which generally have problems such as low remediation efficiency and high treatment costs.
Traditional remediation methods such as landfill, leaching, electrochemistry, etc. have a large amount of engineering, high cost, and often lead to soil structure damage and loss of some nutrients

Method used

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  • Cadmium polluted soil repairing agent as well as preparation method and application thereof
  • Cadmium polluted soil repairing agent as well as preparation method and application thereof
  • Cadmium polluted soil repairing agent as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In the embodiment of the present invention, a cadmium-contaminated soil remediation agent is made of the following raw materials in terms of parts by mass: 67 parts of neem, 21 parts of sodium persulfate, 13 parts of thiourea, 10 parts of superphosphate, and potassium nitrate 20 servings.

[0021] The preparation method of described cadmium polluted soil remediation agent, comprises the following steps:

[0022] (1) Neem is pulverized into powder, and dried to obtain Neem powder, which is set aside;

[0023] (2) Mix neem powder and sodium persulfate in proportion, place it in a humic acid solution with a mass concentration of 5 times its mass and be 25%, heat it to 67°C, and use an ultrasonic wave with a power of 240W and a frequency of 42kHz Treat it for 30 minutes, filter to obtain the first mixture;

[0024] (3) Mix the first mixture and thiourea uniformly in proportion, heat to 550° C. and keep it warm for 3 hours, and naturally cool to normal temperature to obtai...

Embodiment 2

[0027] In the embodiment of the present invention, a cadmium-contaminated soil remediation agent is made of the following raw materials in terms of parts by mass: 75 parts of neem, 16 parts of sodium persulfate, 8 parts of thiourea, 17 parts of superphosphate, and potassium nitrate 34 servings.

[0028] The preparation method of described cadmium polluted soil remediation agent, comprises the following steps:

[0029] (1) Neem is pulverized into powder, and dried to obtain Neem powder, which is set aside;

[0030] (2) Mix neem powder and sodium persulfate in proportion, place it in a humic acid solution with a mass concentration of 6 times its mass and be 28%, heat it to 72°C, and use an ultrasonic wave with a power of 260W and a frequency of 44kHz Treat it for 25 minutes, filter to obtain the first mixture;

[0031] (3) Mix the first mixture and thiourea uniformly in proportion, heat to 620° C. and keep it warm for 2 hours, and naturally cool to normal temperature to obtain...

Embodiment 3

[0034] In the embodiment of the present invention, a cadmium-contaminated soil remediation agent is made of the following raw materials in terms of parts by mass: 69 parts of neem, 20 parts of sodium persulfate, 12 parts of thiourea, 13 parts of superphosphate, and potassium nitrate 26 servings.

[0035] The preparation method of described cadmium polluted soil remediation agent, comprises the following steps:

[0036] (1) Neem is pulverized into powder, and dried to obtain Neem powder, which is set aside;

[0037] (2) Mix neem powder and sodium persulfate in proportion, place it in a humic acid solution with a mass concentration of 5 times its mass and be 28%, heat it to 67°C, and use an ultrasonic wave with a power of 240W and a frequency of 42kHz Treat it for 30 minutes, filter to obtain the first mixture;

[0038] (3) Mix the first mixture and thiourea uniformly in proportion, heat to 550° C. and keep it warm for 3 hours, and naturally cool to normal temperature to obtai...

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Abstract

The invention discloses a cadmium polluted soil repairing agent as well as a preparation method and application thereof. The soil repairing agent is prepared from the following raw materials in parts by mass: 67 to 75 parts of melia azedarach, 16 to 21 parts of sodium persulfate, 8 to 13 parts of thiourea, 10 to 17 parts of calcium superphosphate and 20 to 34 parts of potassium nitrate, wherein the mass ratio of the calcium superphosphate to the potassium nitrate is 1 to 2; the preparation method comprises the following steps: crushing the melia azedarach into powder and drying to obtain melia azedarach powder; mixing the melia azedarach powder with the sodium persulfate, and putting a mixture into a humic acid solution; heating and carrying out ultrasonic treatment; filtering to obtain a first mixture; uniformly mixing the first mixture with the thiourea; heating and carrying out heat-preservation treatment; cooling to obtain a second mixture; mixing the second mixture with the calcium superphosphate and the potassium nitrate, and packaging to obtain the cadmium polluted soil repairing agent. The cadmium polluted soil repairing agent provided by the invention comprises toxin-free and harmless components and has the effects of fixing harmful cadmium metal, improving polluted soil and improving the ecological environment.

Description

technical field [0001] The invention relates to the technical field of pollution treatment, in particular to a cadmium-contaminated soil remediation agent and a preparation method and application thereof. Background technique [0002] At present, the area of ​​heavy metal polluted soil in China is at least 20 million hectares. Heavy metal pollution comes from a wide range of sources, such as unreasonable discharge of "three wastes" in mineral processing and smelting, electroplating, batteries, chemicals, dyes and other industries, sewage irrigation, sludge fertilization, and urban transportation. Vehicle exhaust emissions, improper disposal of electronic waste, etc., will lead to heavy metal pollution in the soil. Soil heavy metal pollution has the characteristics of poor mobility, long residence time, and irreversibility of pollutants in the soil, resulting in decreased soil fertility, reduced crop yield and quality, and polluted groundwater and surface water through runoff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40B09C1/08
CPCC09K17/40B09C1/08
Inventor 不公告发明人
Owner 产俊涛
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