A method for in-situ remediation of the surface of lead-contaminated soil, a passivator and a preparation method thereof

A technology of polluted soil and passivating agent, which is applied in the field of environmental engineering, can solve the problems of high capacity increase ratio, high dosage, poor cement curing effect, etc., and achieve cost reduction, significant economic and environmental benefits, and obvious curing effect Effect

Active Publication Date: 2018-06-22
湖北省地质调查院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the curing method, more agents are used, mainly cement, lime, etc., but the curing effect of cement is not good, and generally a higher dosage is required during use, resulting in an excessively high volumetric expansion ratio.

Method used

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  • A method for in-situ remediation of the surface of lead-contaminated soil, a passivator and a preparation method thereof
  • A method for in-situ remediation of the surface of lead-contaminated soil, a passivator and a preparation method thereof
  • A method for in-situ remediation of the surface of lead-contaminated soil, a passivator and a preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1. Preparation of passivating agent: step one, weigh 74% slag, 16% clinker, and 10% rice husk ash according to the mass percentage of each component. Mix and grind the three raw materials evenly, and control the specific surface area to 800m 2 / kg above, you can get passivating agent.

[0029] 2. Remediation application of lead-contaminated soil. Mix the passivator and the lead-contaminated soil evenly (the passivator is mixed with 7%), control the moisture content of the mixture to 17%, and roll compaction to make its compaction coefficient reach 0.9 or more.

[0030] Solidification effect of soil lead: Take the solidified sample of the predetermined age after curing, prepare the leaching solution according to the procedure of "Solid waste leaching toxicity leaching method Acetic acid buffer solution method" (HJ / T 300), using "Determination of total lead in water quality dithizone spectroscopy" Photometric method" (GB7470-1987) to determine the concentration of total lead ...

Embodiment 2

[0034] 1. Preparation of passivating agent: Step 1, weighing 68% slag, 12% cement clinker, and 20% rice husk ash according to the mass percentage of each component. Mix and grind the three raw materials evenly, and control the specific surface area to 800m 2 / kg above, you can get passivating agent.

[0035] 2. Remediation application of lead-contaminated soil. Mix the passivation agent with the lead-contaminated soil evenly (9% in the passivation agent), control the water content of 17%, and roll compaction so that its compaction coefficient can reach 0.9 or more.

[0036] Solidification effect of soil lead: Take the solidified sample of the predetermined age after curing, prepare the leaching solution according to the procedure of "Solid waste leaching toxicity leaching method Acetic acid buffer solution method" (HJ / T 300), using "Determination of total lead in water quality dithizone spectroscopy" Photometric method" (GB7470-1987) to determine the concentration of total lead in...

Embodiment 3

[0040] 1. Preparation of passivating agent: Step 1, weigh 55.5% slag, 10.5% cement clinker, and 34% rice husk ash according to the mass percentage of each component. Mix and grind the three raw materials evenly, and control the specific surface area to 800m 2 / kg above, you can get passivating agent.

[0041] 2. Remediation application of lead-contaminated soil. Mix the passivation agent with the lead-contaminated soil evenly (12% in the passivation agent), control its moisture content to 17%, and compact it to make its compaction coefficient above 0.9.

[0042] Solidification effect of soil lead: Take the solidified sample of the predetermined age after curing, prepare the leaching solution according to the procedure of "Solid waste leaching toxicity leaching method Acetic acid buffer solution method" (HJ / T 300), using "Determination of total lead in water quality dithizone spectroscopy" Photometric method" (GB7470-1987) to determine the concentration of total lead in the leachat...

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Abstract

The present invention relates to a soil in situ passivating agent, and in particular to a surface in situ remediation method of lead-contaminated soil, a passivating agent and a preparation method thereof, and belongs to the technical field of environmental engineering. The passivating agent comprises 50-80% of slag, 10-16% of cement clinker and 10-34 % of rice hull ash; and the raw materials are mixed and milled, and the specific surface area of the milled powder is controlled at higher than 800m<2> / kg, so as to obtain the passivating agent. The passivating agent in the present invention mainly uses silicate hydrated gel phase for passivation consolidation on lead; the passivating agent has obvious curing effect on heavy metal lead in soil, can reduce the leaching concentration in early curing stage, carry out sustainable curing reaction in the middle and long term, can keep the leaching concentration in a decreasing trend; the raw materials are all from the typical industrial solid wastes, so as to utilize waste, treat pollution and help to reduce costs; therefore, the invention has significant economic and environmental benefits.

Description

Technical field [0001] The invention relates to a soil in-situ passivation agent, in particular to an in-situ repair method for the surface of lead-contaminated soil, a passivation agent and a preparation method thereof, and belongs to the technical field of environmental engineering. Background technique [0002] In recent years, with the rapid development of modern industry and cities, heavy metals have been widely used in chemical, paper, electroplating, textile, printing and dyeing, chemical fiber, and agricultural industries, resulting in serious soil lead pollution. Soil lead pollution has the characteristics of concealment, long-term and irreversibility. According to statistics, there are about 1.3×10 4 hm 2 , The cultivated land was polluted by heavy metals such as lead, which caused a reduction of grain output by 1000×10 4 t. Since 2009, more than 20 lead pollution incidents have been found in many places in my country. For example, in 2009, the discharge of lead-contai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/10B09C1/08
Inventor 申锐莉周旻杨军汪韦兴曾明中侯浩波
Owner 湖北省地质调查院
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