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Curing agent for lead-contaminated soil remediation and remediation method

A technology for lead-contaminated soil and a remediation method is applied in the field of curing agent and remediation for lead-contaminated soil remediation, which can solve the problems of inability to completely eradicate lead elements on the soil surface, short hyperaccumulation plants, and long growth cycles, and achieve a good curing effect. , The effect of good adjustment and low cost

Active Publication Date: 2016-02-24
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 method for remediation of lead-contaminated soil, which includes the following steps:

[0037] A. Treatment of lead-contaminated soil

[0038] First, excavate the lead-contaminated soil that needs to be repaired at a depth of 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 in a ratio of 1:2 by mass ratio of solid to liquid, and stir until the sodium dihydrogen phosphate is completely dissolved to obtain a curing agent liquid, which is prepared for ready use ;

[0042] C, curing repair

[0043] First, mix the curing agent powder prepared in step B with 100 parts of lead-contaminated soil uniformly, then gradually add the curing agent liquid prepared in step B, and continue to mix during the process of adding the curing agent liquid to make it fully mixed wit...

Embodiment 2

[0045] A method for remediation of lead-contaminated soil, which includes the following steps:

[0046] A. Treatment of lead-contaminated soil

[0047] First, excavate the lead-contaminated soil that needs to be repaired at a depth of 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 in a ratio of 1:2 by mass ratio of solid to liquid, and stir until the sodium dihydrogen phosphate is completely dissolved to obtain a curing agent liquid. The curing agent liquid is ready for use ;

[0051] C, curing repair

[0052] First, mix the curing agent powder prepared in step B with 100 parts of lead-contaminated soil uniformly, then gradually add the curing agent liquid prepared in step B, and continue to mix during the process of adding the curing agent liquid to make it fu...

Embodiment 3

[0054] A method for remediation of lead-contaminated soil, which includes the following steps:

[0055] A. Treatment of lead-contaminated soil

[0056] First, excavate the lead-contaminated soil that needs to be repaired at a depth of 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 in a ratio of 1:2 by mass ratio of solid to liquid, and stir until the sodium dihydrogen phosphate is completely dissolved to obtain a curing agent liquid. The curing agent liquid is ready for use ;

[0060] C, curing repair

[0061] First, mix the curing agent powder prepared in step B with 100 parts of lead-contaminated soil uniformly, then gradually add the curing agent liquid prepared in step B, and continue to mix during the process of adding the curing agent liquid to make it full...

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Abstract

The invention discloses a curing agent for lead-contaminated soil remediation and a remediation method. The curing agent comprises components in parts by mass as follows: 3-5 parts of cement, 1-2 parts of quick lime and 1-2 parts of monosodium phosphate. The curing agent has stable and durable curing function and excellent curing effect. According to the lead-contaminated soil remediation method by using the curing agent, the operation is simple; the cost is low; the content of lead in the remediated soil is lower than the national standard; and popularization and application are facilitated.

Description

Technical field [0001] The invention relates to the field of soil remediation, in particular to a curing agent and a method for remediating lead-contaminated soil. Background technique [0002] With the rapid development of my country's industry and agriculture, soil heavy metal pollution has become a focus of attention. Lead-contaminated soil is more serious. Lead-containing soil not only affects soil microorganisms, enzyme activities, and physical and chemical properties, but also secondarily pollutes surface water and groundwater, and harms human health through the food chain. The main causes of soil lead pollution are attributed to coal burning, industrial lead, and automobile 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 management technology, but it has obvious shortcomings: super-accum...

Claims

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Application Information

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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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