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Heavy metal pollutant immobilized reagent composition and immobilization treatment method

A technology for heavy metals and pollutants, applied in the field of soil environmental treatment, can solve the problems of large amount of treatment agent and unsatisfactory treatment effect, and achieve the effects of low cost, restoration and treatment, and reduction of use amount.

Inactive Publication Date: 2013-02-13
LAIWO SAGACITY GREEN TECH BEIJING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The object of the present invention is to propose a chemical reagent composition and a treatment method thereof, in view of the problems of unsatisfactory treatment effect and large amount of treatment agent used in the treatment of heavy metal-contaminated soil in the prior art, and the chemical reagent composition can simultaneously Effectively immobilize various heavy metals such as Cu, Cd, Ni, Cr, Pb, Zn, As and Hg in polluted soil to achieve immobilization and repair of heavy metal polluted soil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The proportioning that immobilization reagent adopts is: by the potassium dihydrogen phosphate of 18 (weight) %, the sodium sulfide of 27 (weight) %, the calcium oxide of 44.5 (weight) %, the calcium carbonate of 10 (weight) %, 0.3 ( (weight) % calcium type A molecular sieve and 0.2 (weight) % disodium edetate.

[0045] The immobilization treatment steps adopted are as follows:

[0046] (1) First weigh the components for preparing 1 part by weight of immobilization reagent according to the following proportions: 18 (weight) % potassium dihydrogen phosphate, 27 (weight) % sodium sulfide, 44.5 (weight) % calcium oxide , 10 (weight)% calcium carbonate, 0.3 (weight)% calcium type A molecular sieve and 0.2 (weight)% disodium edetate;

[0047] (2) Weigh 20 weight samples of heavy metal pollutants;

[0048] (3) Stir and mix the metal oxide, strong base and weak salt compound, metal stabilizer and metal chelating agent weighed in step (1) evenly, and use it as reagent A for l...

Embodiment 2

[0057] The proportioning that immobilization reagent adopts is: by the calcium hydrogen phosphate of 24.5 (weight)%, the sodium sulfide of 8 (weight)%, the calcium oxide of 42 (weight)%, the calcium carbonate of 25 (weight)%, 0.1 (weight) )% of sodium molecular sieve type A and 0.4% by weight of disodium edetate.

[0058] The immobilization treatment steps adopted are as follows:

[0059] (1) First weigh the components for preparing 1 part by weight of immobilization reagent according to the following proportions: 24.5 (weight) % calcium hydrogen phosphate, 8 (weight) % sodium sulfide, 42 (weight) % calcium oxide, 25 (weight) % calcium carbonate, 0.1 (weight) % sodium type A molecular sieve and 0.4 (weight) % disodium edetate;

[0060] (2) Weigh 20 weight samples of heavy metal pollutants;

[0061] (3) Stir and mix the metal oxide, strong base and weak salt compound, metal stabilizer and metal chelating agent weighed in step (1) evenly, and use it as reagent A for later use;...

Embodiment 3

[0070] The proportioning that immobilization reagent adopts is: by the calcium dihydrogen phosphate of 25 (weight) %, the calcium sulfide of 8 (weight) %, the calcium oxide of 42 (weight) %, the calcium carbonate of 24.5 (weight) %, 0.4 ( % by weight of sodium type A molecular sieve and 0.1 % by weight of disodium edetate.

[0071] The immobilization treatment steps adopted are as follows:

[0072] (1) First, weigh and prepare 1 part of immobilization reagent according to the following proportions: 25 (weight) % calcium dihydrogen phosphate, 8 (weight) % calcium sulfide, 42 (weight) % calcium oxide, 24.5% by weight calcium carbonate, 0.4% by weight sodium type A molecular sieve and 0.1% by weight disodium edetate;

[0073] (2) Weigh 40 weight samples of heavy metal pollutants;

[0074] (3) Stir and mix the metal oxide, strong base and weak salt compound, metal stabilizer and metal chelating agent weighed in step (1) evenly, and use it as reagent A for later use;

[0075] (4...

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Abstract

The invention belongs to the technical field of soil environment treatment, and particularly relates to a heavy metal immobilization chemical reagent composition and a treatment method of heavy metal in immobilization polluted soil. The immobilized reagent composition comprises phosphate chemical compound of 5-70%, metal sulfide of 1-60%, metal oxide of 5-80%, strong alkali and weak acid salt of 5-65%, metal stabilizers of 0.1-15% and metal chelator of 0.1-10%. The invention further provides a method of restoring heavy metal polluted soil in an immobilization mode by immobilized reagents. The immobilized reagents can enable various heavy metal pollutants in the polluted soil to be immobilized, the content of activated state (transportable) heavy metal in soil is lowered, and restoration and treatment to the heavy metal polluted soil are achieved. The heavy metal pollutant immobilized reagent composition and the immobilization treatment method have the advantages of being good in immobilization effect, simple and easy in operating process, low in cost, and free of secondary pollution and the like.

Description

technical field [0001] The invention belongs to the technical field of soil environment treatment, and specifically uses a chemical reagent composition to immobilize heavy metal elements in soil, reduce the migration activity of these heavy metals in soil, and then achieve the purpose of repairing heavy metal-contaminated soil. Background technique [0002] With the rapid development of industrialization and urbanization, the situation of soil pollution in my country is becoming more and more severe, and the environmental problem of polluted soil has become a major obstacle in the process of land redevelopment. The discharge of various industrial wastewater, waste gas, and waste residues, the use of chemical fertilizers and pesticides, and the irrigation of farmland with sewage all cause heavy metal pollution in water bodies and soils. On the one hand, these heavy metal-contaminated soils bring environmental and health risks. Heavy metal pollution will lead to a decline in t...

Claims

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Application Information

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IPC IPC(8): A62D3/33C09K17/40B09C1/08A62D101/43A62D101/08
Inventor 魏洪贵高蔷任静朱文薇杨洁刘有昱
Owner LAIWO SAGACITY GREEN TECH BEIJING CO LTD
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