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In-situ remediation method for mercury-contaminated soil

A technology for in-situ remediation and mercury pollution, applied in the field of mercury-contaminated soil remediation, can solve the problems of secondary pollution and high treatment costs, achieve the effects of short treatment period, reduce biological activity, and prevent soil compaction and sandification

Inactive Publication Date: 2019-07-23
湖南双晟科技信息咨询有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the technical problems of high processing costs such as soil leaching and thermal desorption in the in-situ remediation method of mercury-contaminated soil and the secondary pollution easily caused by ex-situ remediation, the present invention provides an in-situ remediation method for mercury-contaminated soil, The operation is simple, the cost is low, the treatment period is short, and the efficiency is high, which can effectively reduce the mercury content in the soil, and is suitable for the application of phytoremediation of large-scale mercury-contaminated soil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A method for in-situ remediation of mercury-contaminated soil, comprising the following steps:

[0017] S1. Pretreatment of mercury-contaminated soil: plow the mercury-contaminated soil to a depth of 15-20 cm, and dry it until the water content is 30%;

[0018] S2, modification of mercury-contaminated soil: add soil modifier to the mercury-contaminated soil after pretreatment, plow again, the depth of plowing is 15 ~ 20cm, make the described soil modifier fully contact with mercury-contaminated soil, keep 3d;

[0019] Add 2kg of the soil modifier per square meter of mercury-contaminated soil; the soil modifier is made by mixing the following raw materials in proportions by weight: 20 parts of fly ash, 15 parts of humic acid, and 15 parts of biochar , Phosphorus tailings powder 20 parts;

[0020] The preparation method of the biochar is as follows: after mixing the corn stalks and wheat stalks in a weight ratio of 3:1, placing them under anoxic conditions at 350°C for ...

Embodiment 2

[0026] A method for in-situ remediation of mercury-contaminated soil, comprising the following steps:

[0027] S1. Pretreatment of mercury-contaminated soil: plow the mercury-contaminated soil to a depth of 15-20 cm, and dry it until the water content is 35%;

[0028] S2, modification of mercury-contaminated soil: add soil modifier to the mercury-contaminated soil after pretreatment, plow again, the depth of plowing is 15 ~ 20cm, make the described soil modifier fully contact with mercury-contaminated soil, keep 4d;

[0029] Add 2.5kg of the soil modifier per square meter of mercury-contaminated soil; the soil modifier is made by mixing the following raw materials in parts by weight: 25 parts of fly ash, 18 parts of humic acid, 17 parts of biochar 25 parts, phosphorous tailings powder;

[0030] The preparation method of the biochar is as follows: after mixing the corn stalks and wheat stalks in a weight ratio of 3:1, placing them under anoxic conditions at 350°C for anoxic c...

Embodiment 3

[0036] A method for in-situ remediation of mercury-contaminated soil, comprising the following steps:

[0037] S1. Pretreatment of mercury-contaminated soil: Plow the mercury-contaminated soil to a depth of 15-20 cm, and dry it until the water content is 40%;

[0038] S2, modification of mercury-contaminated soil: add soil modifier to the mercury-contaminated soil after pretreatment, plow again, the depth of plowing is 15 ~ 20cm, make the described soil modifier fully contact with mercury-contaminated soil, keep 5d;

[0039] Add 3kg of the soil modifier per square meter of mercury-contaminated soil; the soil modifier is made by mixing the following raw materials in proportions by weight: 30 parts of fly ash, 20 parts of humic acid, and 20 parts of biochar , Phosphorus tailings powder 30 parts;

[0040] The preparation method of the biochar is as follows: after mixing the corn stalks and wheat stalks in a weight ratio of 3:1, placing them under anoxic conditions at 350°C for ...

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Abstract

The invention discloses an in-situ remediation method for mercury-contaminated soil. The method comprises the following steps of pretreatment of the mercury-contaminated soil, modification of the mercury-contaminated soil, remediation by a passivator, and phytoremediation. The remediation method is easy to operate, low in cost, short in treatment period, high in efficiency, capable of effectivelyreducing the content of effective mercury in the soil and suitable for plant remediation of the large-area mercury-contaminated soil.

Description

technical field [0001] The invention relates to the technical field of mercury-contaminated soil restoration, in particular to an in-situ restoration method for mercury-contaminated soil. Background technique [0002] Mercury is a serious threat to human life and health and the ecological environment due to its toxic bioaccumulation characteristics. Mercury-contaminated soil poses a huge threat to the quality of crops and agricultural products. Research on the remediation of mercury-contaminated soil has increasingly become a hot spot in the field of environmental science and engineering. The remediation of mercury-contaminated soil can be roughly divided into three categories: physical remediation technology, chemical remediation technology and biological remediation technology. Traditionally used physical and chemical remediation techniques, such as guest soil, leaching, pyrolysis treatment, and chemical solidification, all have certain limitations when remediating contam...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00B09C1/08
CPCB09C1/08B09C1/105B09C2101/00
Inventor 戈捷
Owner 湖南双晟科技信息咨询有限公司
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