Heavy metal pollution soil restoration agent and use method thereof

A soil remediation agent and a technology of polluted soil, applied in the field of soil remediation agent, can solve the problems of making polluted soil harmless, reducing the physical and chemical effectiveness of pollutants, etc., to solve the problems of poor water stability, repair and protect the environment, and easy on-site The effect of construction

Inactive Publication Date: 2017-02-22
广东省润土环境治理有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Effectively solve the problem of heavy metal pollution in soil and realize the chemical remediation of polluted environment; by reducing the physical and chemical effectiveness of pollutants, finally achieve the goal of harmless polluted soil

Method used

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  • Heavy metal pollution soil restoration agent and use method thereof
  • Heavy metal pollution soil restoration agent and use method thereof
  • Heavy metal pollution soil restoration agent and use method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A heavy metal polluted soil remediation agent and its use method, the remediation agent contains modified expanded vermiculite as a pretreatment solidification component, and the modification process is to grind the modified expanded vermiculite to a fineness of passing through a 100-mesh standard sieve, and then It is calcined at 150°C for 3 hours; the excitation and curing components are uniformly mixed with 8% slaked lime, 10% chitosan, 22% water glass and 60% fly ash. Among them, the fineness of hydrated lime is over 200 mesh, and the calcium content before digestion is 85%; the N-deacetylation content of chitosan is 55%; the water glass is solid, and the solid content is 95%; the fineness of fly ash is over 200 mesh , loss on ignition is 5%.

[0022] The above-mentioned modified expanded vermiculite is pre-cured and mixed evenly with the lead, zinc and arsenic heavy metal contaminated soil (passing through a 10 mesh standard sieve, with a water content of 35%) that...

Embodiment 2

[0024] A heavy metal polluted soil remediation agent and its use method, the remediation agent contains modified expanded vermiculite as a pretreatment solidification component, and the modification process is to grind the modified expanded vermiculite to a fineness of passing through a 100-mesh standard sieve, and then It is calcined at 300°C for 1 hour; the excitation and curing components are uniformly mixed with 11% slaked lime, 10% chitosan, 34% water glass and 45% fly ash. Among them, the fineness of slaked lime is over 200 mesh, and the calcium content before digestion is 80%; the N-deacetylation content of chitosan is 70%; the water glass is solid, and the solid content is 95%; the fineness of fly ash is over 200 mesh , The loss on ignition is 8%.

[0025] The above-mentioned modified expanded vermiculite is pre-cured and mixed evenly with the lead and cadmium heavy metal contaminated soil (passing through a 10 mesh standard sieve, with a water content of 20%) that has...

Embodiment 3

[0027] A heavy metal polluted soil remediation agent and its use method, the remediation agent contains modified expanded vermiculite as a pretreatment solidification component, and the modification process is to grind the modified expanded vermiculite to a fineness of passing through a 100-mesh standard sieve, and then It was calcined at 200°C for 2 hours; the excitation and curing components were uniformly mixed with slaked lime 4%, chitosan 4%, water glass 34%, and fly ash 58%; wherein the slaked lime had a fineness of 200 meshes, The calcium content before digestion is 83%; the N-deacetylation content of chitosan is 65%; the water glass is solid, with a solid content of 97%; the fineness of fly ash is over 200 mesh, and the loss on ignition is 10%.

[0028] The above-mentioned modified expanded vermiculite is pre-cured and mixed evenly with the copper and zinc heavy metal contaminated soil (passing through a 10 mesh standard sieve, with a water content of 25%) that has been...

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Abstract

The invention provides a heavy metal pollution soil restoration agent, and relates to a soil restoration agent. The restoration agent comprises a pretreatment curing ingredient and an excitation curing ingredient, wherein the pretreatment curing ingredient comprises modified expanded vermiculite; the excitation curing ingredient comprises 4 to 18 percent of slaked lime, 4 to 10 percent of chitosan, 16 to 34 percent of water glass and 45 to 60 percent of fly ash. The heavy metal pollution soil restoration agent and the use method have the advantages that the efficient curing of soil heavy metal can be realized; the soil heavy metal pollution problem is solved; in addition, the high acidity or high alkality and secondary pollution can be effectively avoided; the uniformity of environment benefits and social benefits is realized.

Description

[0001] Technical field: [0002] The invention relates to a soil remediation agent, in particular to a heavy metal polluted soil remediation agent and a use method thereof. [0003] Background technique: [0004] With the rapid development of industrialization and urbanization in our country, heavy metals will continue to enter the soil environment due to the massive discharge of pollutants, the use of unqualified agricultural materials, and the unreasonable mining of mineral resources. cause soil pollution. At present, soil heavy metal pollution has become one of the major bottlenecks restricting the development of my country's agriculture, and it also poses a serious threat to the safety of my country's agricultural products. Therefore, remediation of heavy metal-contaminated soil has become an important research hotspot. At present, the soil heavy metal remediation technologies mainly include phytoremediation technology, cement solidification and stabilization, soil elutio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40
CPCC09K17/40
Inventor 陈冬云张强林霖李宁宁
Owner 广东省润土环境治理有限公司
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