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Stabilizing restoration method for heavy-metal contaminated soil

A technology of polluted soil and remediation method, applied in the restoration of polluted soil and other directions, can solve the problems of long screening period of biological bacteria, many shortcomings, and insignificant effects, and achieves easy stabilization treatment, short treatment time, and wide application range. Effect

Inactive Publication Date: 2015-12-02
JIANGSU LONGCHANG CHEM
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] Engineering measures and physical restoration of heavy metal-contaminated soil have many disadvantages. Large-scale treatment of contaminated soil is unrealistic, and it will destroy the soil structure, reduce biological activity, and degrade soil fertility.
However, the agro-ecological measures have a long cycle and the effect is not obvious
Bioremediation is highly efficient, but the screening period for biological bacteria is long

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A method for stabilizing and remediating heavy metal-contaminated soil, the innovation of which is to use calcium-aluminum hydrotalcite as a remediation agent. The specific steps of the method are as follows:

[0032] (1) Soil collection: Select chromium-contaminated soil samples as the research object, collect the contaminated soil and send it to the laboratory to test its heavy metal concentration and basic physical and chemical properties, such as pH value, maximum water holding capacity, cation exchange capacity, viscosity, etc.;

[0033] (2) Stabilization experiment: Weigh 200g of contaminated soil into a 500ml beaker, add calcium-aluminum soil remediation agent 0, 2.5%, 5%, and 10% in different mass percentages, and add corresponding volume of deionized water, stirred evenly and stabilized under natural conditions, and samples were taken 2 days, 7 days, and 14 days after stabilization for leaching experiments. During this period, it was stirred three times, and dei...

Embodiment 2

[0035] A method for remediating heavy metal-contaminated soil stabilized by calcium-aluminum hydrotalcites, the innovation of which is that the specific steps of the method are as follows:

[0036] (1) Soil collection: select mercury-contaminated soil samples as the research object, collect the contaminated soil and send it to the laboratory to test its heavy metal concentration and basic physical and chemical properties, such as pH value, maximum water holding capacity, cation exchange capacity, viscosity, etc.;

[0037] (2) Stabilization experiment: Weigh 150g of contaminated soil into a 500ml beaker, add calcium-aluminum soil remediation agent with different mass percentages of 0%, 2%, 6%, and 12%, according to 60% of the maximum water holding capacity of the soil Add the corresponding volume of deionized water, stir it evenly, and then stabilize it under natural conditions, and take samples for leaching experiments 2 days, 7 days, and 14 days after stabilization. During thi...

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Abstract

The invention relates to a stabilizing restoration method for heavy-metal contaminated soil. The method is characterized in that Ca-Al hydrotalcite like compounds are used as restoring agents. The method comprises the specific steps of firstly, soil collecting: selecting contaminated soil samples, collecting and sending the contaminated soil to a laboratory, and detecting the heavy metal concentration and basic physicochemical properties of the contaminated soil; and secondly, stabilization experiment: weighing the contaminated soil, putting the contaminated soil into a 500ml beaker, adding Ca-Al like soil restoration agents of different mass percentages, adding deionized water of the corresponding volume in accordance with 60% of the soil maximum water-holding capacity, stirring the mixture uniformly, stabilizing the mixture under the natural condition, and taking samples on the second day, the seventh day and the fourteenth day after stabilization for leaching experiments. The stabilizing restoration method for heavy-metal contaminated soil has the advantages of being short in treatment time, wide in application range and low in cost.

Description

technical field [0001] The invention relates to a soil restoration method, in particular to a stabilized restoration of heavy metal polluted soil, and the restoration agent used is calcium-aluminum hydrotalcite. Background technique [0002] With the rapid development of modern industry and agriculture, the situation of soil heavy metal pollution is becoming more and more serious, and heavy metal pollution incidents in my country are entering a period of high incidence. Heavy metals in contaminated soil include elements with significant biological toxicity such as Cd, Pb, Hg, Cr, As, and elements with certain toxicity such as Cu, Zn, Ni. This type of pollution has a wide range, long duration, hidden pollution, and cannot be biodegraded, which will lead to soil degradation, decline in crop yield and quality, and pollute surface water and groundwater through runoff and leaching. Excessive heavy metals will have adverse effects on plant physiological functions and cause nutrit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
Inventor 张剑宇俞周健赵雪松郑南峰
Owner JIANGSU LONGCHANG CHEM
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