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Curing agent and repair method for lead-contaminated soil repair

A technology of lead-contaminated soil and repair method, which is applied in the field of curing agent and repair for lead-contaminated soil repair, which can solve the problems of inability to completely eradicate lead elements on the soil surface, super-accumulated plants, short plants, and slow growth speed, etc., and achieve good curing effect , Good adjustment effect, long-lasting curing effect

Active Publication Date: 2018-05-18
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Among them, phytoremediation is recognized as an ideal in-situ soil treatment technology, but there are obvious disadvantages: hyperaccumulative plants are often short in size, low in biomass, slow in growth, and long in growth cycle; phytoremediation is affected by soil type, temperature, and humidity. environmental constraints such as nutrition and
[0005] However, the current solidification stabilization method is suitable for soils that are not seriously polluted, and the restoration cost is low, so there is a certain application space
Moreover, this repair method cannot completely eradicate the lead element on the soil surface, and the repair effect has a certain temporary nature.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A repair method for lead-contaminated soil, which comprises the following steps:

[0037] A. Treatment of lead-contaminated soil

[0038] First, excavate the lead-contaminated soil that needs to be repaired, the excavation depth is 35cm, and transfer the soil to a special site for soil repair;

[0039] B. Preparation of curing agent

[0040] Mix 3 parts of Portland cement and 1 part of quicklime evenly to obtain curing agent powder;

[0041] Weigh 1 part of sodium dihydrogen phosphate, then add water at a solid-to-liquid mass ratio of 1:2, stir until sodium dihydrogen phosphate is completely dissolved, and obtain a solidifying agent liquid, which is ready-to-use ;

[0042] C, curing repair

[0043] Firstly mix the solidifying agent powder prepared in step B with 100 parts of lead-contaminated soil, then gradually add the solidifying agent liquid prepared in step B, and continuously mix in the process of adding the solidifying agent liquid, so that it is fully mixed ...

Embodiment 2

[0045] A repair method for lead-contaminated soil, which comprises the following steps:

[0046] A. Treatment of lead-contaminated soil

[0047] First, excavate the lead-contaminated soil that needs to be repaired, the excavation depth is 30cm, and transfer the soil to a special site for soil repair;

[0048] B. Preparation of curing agent

[0049] Mix 3 parts of Portland cement and 2 parts of quicklime evenly to obtain curing agent powder;

[0050] Weigh 1.5 parts of sodium dihydrogen phosphate, then add water at a solid-to-liquid mass ratio of 1:2, and stir until sodium dihydrogen phosphate is completely dissolved to obtain a solidifying agent liquid, which is ready-to-use ;

[0051] C, curing repair

[0052]Firstly mix the solidifying agent powder prepared in step B with 100 parts of lead-contaminated soil, then gradually add the solidifying agent liquid prepared in step B, and continuously mix in the process of adding the solidifying agent liquid, so that it is fully m...

Embodiment 3

[0054] A repair method for lead-contaminated soil, which comprises the following steps:

[0055] A. Treatment of lead-contaminated soil

[0056] First, excavate the lead-contaminated soil that needs to be repaired, the excavation depth is 40cm, and transfer the soil to a special site for soil repair;

[0057] B. Preparation of curing agent

[0058] Mix 5 parts of Portland cement and 2 parts of quicklime evenly to obtain curing agent powder;

[0059] Weigh 2 parts of sodium dihydrogen phosphate, then add water at a solid-to-liquid mass ratio of 1:2, and stir until sodium dihydrogen phosphate is completely dissolved to obtain a solidifying agent liquid, which is ready-to-use ;

[0060] C, curing repair

[0061] Firstly mix the solidifying agent powder prepared in step B with 100 parts of lead-contaminated soil, then gradually add the solidifying agent liquid prepared in step B, and continuously mix in the process of adding the solidifying agent liquid, so that it is fully mi...

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Abstract

The invention discloses a curing agent and a repairing method for the restoration of lead-contaminated soil. The curing agent is composed of the following parts by mass: 3-5 parts of cement, 1-2 parts of quicklime, and 1-2 parts of sodium dihydrogen phosphate. The curing agent of the invention has stable and durable curing effect and good curing effect. The lead-contaminated soil remediation method using the curing agent has the advantages of simple operation and low cost, and the content of lead in the remediated soil is lower than the national standard, which is suitable for popularization and application.

Description

technical field [0001] The invention relates to the field of soil remediation, in particular to a curing agent and a remediation method for remediation of lead-contaminated soil. Background technique [0002] With the rapid development of industry and agriculture in our country, soil heavy metal pollution has become the focus of attention. Among them, lead-contaminated soil is more serious. Lead-containing soil not only affects soil microorganisms, enzyme activity, and physical and chemical properties, but also pollutes surface water and groundwater twice, and endangers human health through the food chain. The main causes of soil lead pollution are coal burning, industrial lead and vehicle exhaust. [0003] The remediation methods of lead-contaminated soil mainly include solidification stabilization method, phytoremediation and chemical extraction. [0004] Among them, phytoremediation is recognized as an ideal in-situ soil treatment technology, but there are obvious disad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 兰鑫牟海燕侯翔陈文清
Owner SICHUAN UNIV
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