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In-situ restoration method for heavy metal polluted soil

A technology of contaminated soil and in-situ remediation, applied in the restoration of contaminated soil, etc., can solve problems such as difficult implementation and large land area

Active Publication Date: 2011-06-22
刘阳生
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the current action distance is too small, and the actual polluted land area is too large, this technology is difficult to implement in engineering, and despite its high operating costs, it is unaffordable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 1) Preparation of heavy metal-contaminated soil remediation agent: uniformly mix submicron iron with a particle size of 400nm, fly ash, magnesium chloride and bentonite according to a weight ratio of 15:42:3:40 to obtain a heavy metal-contaminated soil remediation agent;

[0041] 2) Apply heavy metal-contaminated soil remediation agent: apply 3cm-thick heavy metal-contaminated soil remediation agent on the surface of heavy metal-contaminated soil, and then cover the surface layer of heavy metal-contaminated soil remediation agent with 20cm thick uniformly mixed non-polluted soil;

[0042]3) Restoration: After 6 months, the heavy metals cadmium, chromium, mercury, lead, arsenic, nickel, zinc, copper, manganese and vanadium in the heavy metal polluted soil are reduced to low-priced immobilized heavy metals, losing their bioavailability, The in-situ remediation of heavy metal-contaminated soil has been realized, and the remediation soil environmental quality meets the requi...

Embodiment 2

[0044] 1) Preparation of heavy metal-contaminated soil remediation agent: uniformly mix nano-iron with a particle size of 90nm, fly ash, magnesium sulfate and bentonite according to a weight ratio of 20:40:2:38 to obtain a heavy metal-contaminated soil remediation agent;

[0045] 2) Apply heavy metal-contaminated soil remediation agent: After applying 3cm thick heavy metal-contaminated soil remediation agent on the surface of heavy metal-contaminated soil, mix the 20cm-thick soil on the surface of the contaminated soil with the applied remediation agent by plowing;

[0046] 3) Restoration: After 3 months, the heavy metals cadmium, chromium, mercury, lead, arsenic, nickel, zinc, copper, manganese and vanadium in the heavy metal polluted soil are reduced to low-priced immobilized heavy metals, losing their bioavailability, The in-situ remediation of heavy metal-contaminated soil has been realized, and the remediation soil environmental quality meets the requirements of the second...

Embodiment 3

[0048] 1) Preparation of heavy metal-contaminated soil remediation agent: uniformly mix submicron iron with a particle size of 200nm, fly ash, magnesium carbonate and bentonite according to a weight ratio of 15:45:5:35 to obtain a heavy metal-contaminated soil remediation agent;

[0049] 2) Apply heavy metal-contaminated soil remediation agent: After applying 4cm thick heavy metal-contaminated soil remediation agent on the surface of heavy metal-contaminated soil, mix the 20cm-thick soil on the surface of the contaminated soil with the applied remediation agent by plowing;

[0050] 3) Restoration: After 4 months, the heavy metals cadmium, chromium, mercury, lead, arsenic, nickel, zinc, copper, manganese and vanadium in the heavy metal polluted soil are reduced to low-priced immobilized heavy metals and lose their bioavailability. The in-situ remediation of heavy metal-contaminated soil has been realized, and the remediation soil environmental quality meets the requirements of t...

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Abstract

The invention discloses an in-situ restoration method for heavy metal polluted soil, which comprises the following steps of: uniformly mixing submicron or nano iron, coal ash, a magnesium-containing preparation and bentonite in proportion by weight of (5-25): (40-50): (1-10): (15-50) to obtain a heavy metal polluted soil restoration agent, after applying the heavy metal polluted soil restoration agent on the surface of the heavy metal polluted soil at the thickness of 1-4cm, uniformly mixing a 20cm thick polluted soil surface layer with the applied restoration agent by plowing, and after 3-6 months, reducing heavy metals such as cadmium, chromium, mercury, lead, arsenic, nickel, zinc, copper, magnesium and vanadium in the heavy metal polluted soil into low-valence immobilized heavy metals to lose biological effectiveness and realize the in-situ restoration for the heavy metal polluted soil. However, the environmental quality of restored soil satisfies the requirements of second-level standard values in Environmental Quality Standards for Soils (GB 15618-1995) in China.

Description

technical field [0001] The invention relates to an in-situ remediation technology for heavy metal polluted soil. Specifically, the heavy metal is fixed in the soil after being reduced by submicron and nanometer iron, the heavy metal loses its biological activity, and the soil remediation meets China's "Soil Environmental Quality Standard" (GB 15618-1995) requirements for secondary standard values. Background technique [0002] my country's heavy metal pollution incidents are entering a period of high incidence. [0003] In 2005, the China Geological Survey found that 13% of the country's land area was polluted; among all types of pollution, heavy metal pollution accounted for a large proportion. [0004] In 2009, the Ministry of Environmental Protection announced 12 heavy metal pollution incidents, resulting in 4035 people with blood lead exceeding the standard and 182 people with cadmium exceeding the standard. There were 32 mass incidents caused by heavy metal pollution a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08
Inventor 刘阳生
Owner 刘阳生
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