Remediation material and remediation method for heavy metal contaminated soil

A technology of contaminated soil and remediation materials, applied in the restoration of polluted soil, soil conditioning materials, chemical instruments and methods, etc., can solve the problems of insignificant remediation effect, poor implementation effect and secondary pollution of heavy metal Cd pollution in soil , to achieve the effects of reducing bioavailability and mobility, increasing specific surface area, and reducing the harm to the ecological environment

Pending Publication Date: 2019-10-08
浙江中地净土科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to solve the problems in the background technology that the restoration effect of soil heavy metal Cd pollution is not significant, the implementation effect is not good, and there is secondary pollution, and a kind of heavy metal contaminated soil restoration material and its restoration method are proposed.

Method used

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  • Remediation material and remediation method for heavy metal contaminated soil
  • Remediation material and remediation method for heavy metal contaminated soil

Examples

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Comparison scheme
Effect test

Embodiment 1

[0043] A heavy metal-contaminated soil restoration material comprises modified clay minerals, calcium-magnesium-based composite materials, and magnesium oxide, in parts by weight: 20 parts of modified clay minerals, 30 parts of calcium-magnesium-based composite materials, and 5 parts of magnesium oxide.

[0044] The modified clay mineral is a modified zeolite. The natural zeolite is modified by thermal modification. The natural zeolite can be calcium zeolite. The preparation method of the modified zeolite includes:

[0045] a1. pretreatment, the natural zeolite is naturally dried, pulverized, and sieved through a 200-mesh sieve to obtain a zeolite pretreatment product;

[0046] a2. Heat treatment, the pretreated zeolite is heat treated, the heat treatment temperature is 300-500 ° C, and the heat treatment time is 3-5 hours; first, the temperature is raised to about 380 ° C at a heating rate of 15 ° C / min, and at this temperature Continue for 3 hours, then raise the temperatu...

Embodiment 2

[0067] A heavy metal contaminated soil restoration material, comprising modified clay minerals, calcium-magnesium-based composite materials, and magnesium oxide, in parts by weight: 20-60 parts of modified clay minerals, 30-60 parts of calcium-magnesium-based composite materials, and magnesium oxide 5-10 parts, the parts by weight of the microbial strains are 1-5 parts; the microbial strains can be mixed strains of Bacillus, Corynebacterium and Enterobacter.

[0068] The modified clay mineral is a modified zeolite. The natural zeolite is modified by thermal modification. The natural zeolite can be a mixed material of analcite, heulandite and calcium zeolite. The preparation method of the modified zeolite includes:

[0069] a1. pretreatment, the natural zeolite is naturally dried, pulverized, and sieved through a 200-mesh sieve to obtain a zeolite pretreatment product;

[0070] a2. Heat treatment, the pretreated zeolite is heat treated, the heat treatment temperature is 300-500...

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Abstract

The invention discloses a remediation material and a remediation method for heavy metal contaminated soil, and belongs to the technical field of soil remediation. The remediation material comprises, by weight, 20-60 parts of modified clay minerals, 30-60 parts of calcium-magnesium based composite materials and 5-10 parts of magnesium oxides. The remediation material and the remediation method havethe advantages that the natural minerals serve as main bodies of the repairing material, free heavy metal ions can be adsorbed through reactions, the remediation material is not easy to dissolve in water, heavy metals are prevented from being absorbed by root systems of crops and animals, and the pollution risks of the water and soil environment are greatly reduced; the remediation material is low in cost, green, natural, and free of secondary pollution.

Description

technical field [0001] The invention relates to the technical field of soil remediation, in particular to a heavy metal contaminated soil remediation material and a remediation method thereof. Background technique [0002] With the continuous development of the global economy, soil heavy metal pollution has become a major problem facing the global environmental quality. Human industrial activities, such as: mineral mining, metal smelting, domestic wastewater discharge, use of chemical fertilizers and pesticides, etc., have greatly accelerated. The cycle of heavy metals makes the heavy metals in the environment continuously increasing, which increases the harm of heavy metals to human health. When heavy metals entering the environment exceed their capacity in the environment, heavy metal pollution can occur. Heavy metal pollutants are persistent pollutants, and the harm to the environment and human body is difficult to eliminate. [0003] Heavy metals have the characteristi...

Claims

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Application Information

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IPC IPC(8): C09K17/08B09C1/08
CPCB09C1/08B09C2101/00C09K17/08
Inventor 陈林赵炯烨蔡晶晶
Owner 浙江中地净土科技有限公司
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