Stabilizing processing method of heavy metal contaminated soil

A technology for stabilizing treatment and polluted soil, applied in the field of soil remediation, can solve the problems of large amount of chemicals added, secondary pollution, and the stabilization effect is not lasting, and achieves the effect of simple process and low cost

Active Publication Date: 2014-10-01
ENVIRONMENTAL SCI RES & DESIGN INST OF ZHEJIANG PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The invention provides a method for stabilizing heavy metal-contaminated soil. Aiming at the problems of heavy metal-contaminated soil remediation technology, such as the large amount of medicament added, secondary pollution, and unsustainable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A silty sandy soil was used to simulate the preparation of contaminated soil. The content of lead in the soil was about 3219mg / kg. After long-term aging, it was used for the simulation test. The lead concentration leached by SPLP method (sulfuric acid-nitric acid leaching method) was 62.8mg / L. .

[0044] It was treated with a laboratory ball mill (XMG-150×50), 0.8% bentonite (particle size less than 2μm) was added, the cylinder speed was 20r / min, the weight ratio of ball to soil was 1:1, ball milled for 2h, and then added 0.5% calcium sulfate and 0.05% triethanolamine, and then ball-milled for 15 minutes to adjust the soil moisture content to 40% of the maximum soil water holding capacity.

[0045] The lead concentration of the treated soil leached by SPLP method is 10.5mg / L, and it is backfilled into the foundation pit, and the soil in the foundation pit is compacted by layered compaction. The compaction degree is greater than 93%, and the stabilization rate reaches 83%....

Embodiment 2

[0047] A silty sandy soil was used to simulate the preparation of contaminated soil. The lead content in the soil was about 3219mg / kg. After long-term aging, the lead concentration was 62.8mg / L.

[0048] It was treated with a laboratory ball mill, added with 0.4% bentonite (particle size less than 2μm), the cylinder speed was 15r / min, the weight ratio of ball to soil was 2:1, ball milled for 0.5h, and then 0.8% calcium sulfate and 0.03% calcium sulfate were added. % triethanolamine, and then ball-milled for 20 min to adjust the soil moisture content to 50% of the maximum soil water holding capacity.

[0049] The lead concentration of the treated soil leached by SPLP method is 12.5mg / L, and it is backfilled into the foundation pit, and the soil in the foundation pit is compacted by layered compaction. The compaction degree is greater than 93%, and the stabilization rate reaches 80%. %.

Embodiment 3

[0051] A silty sandy soil was used to simulate the preparation of contaminated soil. The lead content in the soil was about 3219mg / kg. After long-term aging, the lead concentration was 62.8mg / L.

[0052] It was treated with a laboratory ball mill, adding 1% bentonite (particle size less than 2μm), the cylinder speed was 25r / min, the weight ratio of ball soil was 0.5:1, ball milled for 1h, and then 0.2% calcium sulfate and 0.02% calcium sulfate were added. The triethanolamine was then ball-milled for 10 min to adjust the soil moisture content to 30% of the soil maximum water holding capacity.

[0053] The lead concentration of the treated soil leached by SPLP method is 11.5mg / L, backfill into the foundation pit, and the soil in the foundation pit is compacted by layered compaction, the compaction degree is greater than 93%, and the stabilization rate reaches 81.7 %.

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Abstract

The invention discloses a stabilizing processing method of heavy metal contaminated soil. The stabilizing processing method comprises the following steps of (1) excavating the heavy metal contaminated soil, airing and drying the heavy metal contaminated soil, then feeding into a ball grinder, simultaneously feeding clay mineral the mass fraction of which is 0.4%-1%, and carrying out ball milling; step (2) adding calcium salt mass fraction of which is 0.2%-0.8% and a surface active agent mass fraction of which is 0.02%-0.2% to the ball grinder after finishing ball milling, unceasingly rolling and milling the soil in the ball grinder for 10-20min, and regulating soil moisture content; and (3) backfilling the soil processed in the step (2) in a foundation pit, and tamping the soil. The invention provides a physical impacting and bonding method aiming at the problems of existing heavy metal contaminated soil restoration technology that the additive amount of medicament is large, secondary pollution is easy to generate, and the stabilizing effect is not lasting, an exogenous heavy metal pollutant is packed and stabilized in soil granules, the release of heavy metal is reduced, and a stabilizing effect is achieved.

Description

technical field [0001] The invention relates to a method for harmless treatment of polluted soil, in particular to a method for stabilizing treatment of heavy metal polluted soil, and belongs to the technical field of soil remediation. Background technique [0002] With the continuous acceleration of industrialization, land pollution is becoming more and more serious. Heavy metal pollution is an important type of soil pollution, which mainly comes from heavy metal pollution discharge from mining, smelting, electroplating, chemical, electronics and tanning industries. Heavy metals in polluted soil mainly include mercury (Hg), cadmium (Cd), lead (Pb), chromium (Cr) and metalloid arsenic (As) and other elements with significant biological toxicity, as well as certain toxic zinc (Zn), copper (Cu), nickel (Ni) and other elements, toxic metal elements can come into contact with the human body through dust, drinking water, etc., and can also cause health hazards to humans through ...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/08
Inventor 张弛钟重孙璐冯一舰杨晓丹
Owner ENVIRONMENTAL SCI RES & DESIGN INST OF ZHEJIANG PROVINCE
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