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Efficient solidification/stabilization repair reagent for soil contaminated by heavy metals

A technology for polluted soil and remediation agents, applied in soil conditioning materials, chemical instruments and methods, organic fertilizers, etc., can solve problems such as great influence, and achieve the effect of reducing the degree of toxicity

Inactive Publication Date: 2014-11-26
QINGDAO HUAREN TECH INCUBATOR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Microbial remediation technology has the advantages of wide sources of microorganisms and low impact on the environment, but specific microorganisms can only deal with a single type of heavy metals, and are greatly affected by environmental conditions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0028] The present invention also provides a preparation method of the above-mentioned stable repairing agent. The stable repairing agent is obtained by uniformly mixing gypsum, magnesium oxide and diatomaceous earth according to the above mass ratio.

[0029] The present invention also provides a method for using the above-mentioned stable repair agent. Gypsum, magnesium oxide, and diatomite are uniformly mixed according to the above mass ratio to obtain a mixture, which is added to heavy metal-contaminated soil. The added amount of the added stable repair agent is 1% to 10% of soil weight. Through precipitation, adsorption, complexation and redox, etc., heavy metals are fixed in the soil environment, reducing mobility and diffusivity. The heavy metal leaching concentration in the soil after remediation can reach the corresponding standard.

[0030] The stable restoration agent can be used for the treatment of single heavy metal-contaminated soil, and is also suitable for th...

Embodiment 1

[0033] The experimental soil was collected from a heavy metal-contaminated area in Baiyin. The heavy metal content in the soil surface in this area was higher than the third-level standard of the "Soil Environmental Quality Standard" (GB15618-1995). 1800 times. According to the actual situation of pollution, we carried out the following repair process:

[0034] (1) Preparation of heavy metal-contaminated soil remediation agent: gypsum, magnesium oxide and diatomaceous earth were uniformly mixed according to the mass ratio of 20:75:5 to become heavy metal-contaminated soil remediation agent.

[0035] (2) Apply heavy metal-contaminated soil remediation agent, use a forklift to dig all the heavy metal-contaminated soil into the crusher for crushing, and convey it to the mixer through a belt, mix the remediation agent with 8% of the soil weight with the contaminated soil, and place it for stacking The location, that is, the soil to which the remediation agent is added.

[0036](...

Embodiment 2

[0041] The experimental soil was collected from the bottom mud soil at a depth of 0-150cm in a sewage discharge channel in Baiyin. The heavy metal content in the soil was tested to be higher than the third-level limit of the "Soil Environmental Quality Standard" (GB15618-1995), and the cadmium exceeded the standard rate by 100%. Hundred percent, and up to thousands of times. According to the actual situation of pollution, we carried out the following repair process:

[0042] (1) Preparation of heavy metal-contaminated soil remediation agent: gypsum, magnesium oxide and diatomaceous earth were uniformly mixed according to the mass ratio of 30:60:10 to become heavy metal-contaminated soil remediation agent.

[0043] (2) Apply heavy metal-contaminated soil remediation agent, use a forklift to dig all the heavy metal-contaminated soil with a depth of 0-150cm and send it to the crusher for crushing, and convey it to the mixer through a belt, and the remediation agent with 5% of the...

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Abstract

The invention provides an efficient solidification / stabilization repair reagent for soil contaminated by heavy metals. Raw materials of the efficient solidification / stabilization repair reagent comprise gypsum, magnesium oxide and diatomite. The reagent provided by the invention is mainly for the soil co-contaminated by a plurality of heavy metals such as cadmium, zinc, copper, lead and mercury, and can effectively reduce bio-availability and mobility of the heavy metals, thereby guaranteeing safety of the soil. The selected materials are widely available; cost of the raw materials is relatively low; and the reagent has a significant effect and no secondary pollution, and is an environment-friendly heavy metal passivated repair reagent.

Description

technical field [0001] The invention relates to the technical field of treatment and restoration of heavy metal-contaminated soil, in particular to an efficient curing and stable restoration agent for heavy metal-contaminated soil. Background technique [0002] Heavy metals refer to a class of metal elements with a specific gravity greater than 5. The harm of heavy metal pollution is mainly reflected in two aspects. One is that heavy metals cannot be degraded in the environment and are used to accumulate in organisms to cause teratogenicity or mutation of organisms. On the other hand, heavy metals can be transmitted through the food chain. Once they enter the human body, After a period of accumulation, it will cause great harm to human health. The recently released National Soil Pollution Survey Bulletin pointed out that the total soil pollution rate in the country was 16.1%, of which the proportions of slightly, lightly, moderately and heavily polluted sites were 11.2%, 2....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/06
Inventor 不公告发明人
Owner QINGDAO HUAREN TECH INCUBATOR
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