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Soil in-situ remediation agent for simultaneous treatment of heavy metal and organic pollution

An in-situ remediation agent and a technology for polluted soil, applied in the restoration of polluted soil, organic fertilizers, soil conditioning materials, etc., can solve the problems of limited application, long repair period, secondary pollution, etc. Strong water permeability and the effect of reducing the content of heavy metals

Active Publication Date: 2017-05-10
佑景天(北京)国际水环境研究中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chemical remediation is to inject surfactants into the soil to increase the mobility of PAHs and other polycyclic aromatic hydrocarbons to move out of the soil or form organic clay to improve the retention and stability of pollutants and reduce their ability to migrate into the ecological environment. However, chemical remediation Easy to cause secondary pollution of groundwater and other environments, high cost, difficult to cure, etc.
Microbial remediation is the use of screened and domesticated targeted microorganisms to degrade polycyclic aromatic hydrocarbons in soil, but it is easy to compete with native microorganisms, has potential ecological risks, and is highly targeted and not widely applicable
Phytoremediation is to select plants with hyperaccumulation and use the effect of plant rhizosphere to promote microbial decomposition of polycyclic aromatic hydrocarbons. This method is economical and practical, and can improve the ecological environment, but the restoration period is long

Method used

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  • Soil in-situ remediation agent for simultaneous treatment of heavy metal and organic pollution
  • Soil in-situ remediation agent for simultaneous treatment of heavy metal and organic pollution
  • Soil in-situ remediation agent for simultaneous treatment of heavy metal and organic pollution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Preparation of soil remediation agent

[0037] 1) Take 100kg of Hangjin 2# soil, add 10kg of activated carbon, 20kg of cement (Portland cement), 2kg of organic flocculant (polydimethyldiallylammonium chloride) and 15kg of soil bacteria (Pseudomonas aeruginosa), formulated as mixture A;

[0038] 2) Take 16 kg of sodium thiosulfate, 16 kg of iron oxide and 32 kg of alkali metal carbonate (sodium carbonate) and mix them uniformly to prepare mixture B;

[0039] 3) According to the ratio of mixture B: mixture A of 20:80, add the corresponding proportion of mixture B into mixture A, and mix evenly to prepare the soil remediation agent.

[0040] (2) Soil remediation treatment

[0041] After applying the soil remediation agent with a thickness of 1 cm on the surface of the heavy metal-contaminated soil, the 20 cm thick soil on the surface of the contaminated soil was mixed evenly with the applied soil remediation agent by tilling.

[0042] One week later, heavy metals su...

Embodiment 2

[0056] (1) Preparation of soil remediation agent

[0057] 1) Take 100kg of Hangjin 2# soil, add 20kg of activated carbon, 35kg of cement (high alumina cement), 4kg of organic flocculant (polydimethyldiallylammonium chloride) and 25kg of soil bacteria (Bacillus ), mix well, and prepare mixture A;

[0058] 2) Take 16kg of sodium thiosulfate, 16kg of iron oxide, 48kg of alkali metal carbonate (calcium carbonate) and 56kg of aluminum sulfate, mix them evenly, and prepare mixture B;

[0059] 3) According to the ratio of mixture B: mixture A mass ratio of 30:70, add the corresponding proportion of mixture B into mixture A, and mix evenly to prepare the soil repair agent.

[0060] (2) Soil remediation treatment

[0061] After applying the soil remediation agent with a thickness of 3 cm on the surface of the heavy metal-contaminated soil, the soil with a thickness of 20 cm on the surface of the contaminated soil was mixed evenly with the applied soil remediation agent by plowing.

...

Embodiment 3

[0069] (1) Preparation of soil remediation agent

[0070] 1) Take 100kg of Hangjin 2# soil, add 30kg of activated carbon, 50kg of cement (25kg of fly ash cement and 25kg of calcium aluminate cement), and 5kg of organic flocculant (polydimethyldiallyl chloride ammonium) and 10kg of soil bacteria (subtilis) to prepare mixture A;

[0071] 2) Take 16kg of sodium thiosulfate, 16kg of iron oxide, 96kg of alkali metal carbonate, 80kg of aluminum sulfate and 16kg of alkali metal carbonate (magnesium carbonate) and mix them uniformly to prepare mixture B;

[0072] 3) According to the ratio of mixture B: mixture A mass ratio of 25:75, add the corresponding proportion of mixture B into mixture A, and mix evenly to prepare the soil remediation agent.

[0073] (2) Soil remediation treatment

[0074] After applying the soil remediation agent with a thickness of 5 cm on the surface of the heavy metal-contaminated soil, the soil with a thickness of 20 cm on the surface of the contaminated s...

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Abstract

The invention relates to a soil in-situ repairing agent used for synchronous treating heavy metal pollution and organic pollution. The soil in-situ repairing agent includes a mixture A and a mixture B, wherein the mixture A comprises following components, by mass, 100 parts of Hangjin 2# soil, 10-30 parts of activated charcoal, 20-50 parts of cement and 2-5 parts of an organic flocculant; and the mixture B comprises at least three of following components, by mass, 16-32 parts of sodium thiosulfate, 16-32 parts of ferric oxide, 48-96 parts of calcium sulfate, 32-80 parts of aluminum sulfate and 16-32 parts of an alkali metal carbonate. The soil in-situ repairing agent can eliminate bio-availability from heavy metals, such as cadmium, chromium, mercury, lead, arsenic, nickel, zinc, copper, manganese and vanadium. Meanwhile, the soil in-situ repairing agent can degrade and adsorbingly remove organic pollutant in soil and can enable soil after being repaired is stable in aggregate. The soil in-situ repairing agent allows soil to have strong water-retaining property, breathability and water permeability.

Description

technical field [0001] The invention relates to a soil restoration agent, which can simultaneously treat heavy metal pollutants and organic pollutants in soil. Background technique [0002] Soil is the basic resource for human survival and an important place for material and energy exchange and circulation in the earth's ecosystem. Once the soil is polluted, the impact on the environment is continuous and irreversible. Heavy metals and organic pollution are two typical types of soil pollution in my country. [0003] At present, my country's heavy metal pollution incidents are entering a period of high incidence. 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. There are many reasons for heavy metal pollution, mainly due to the production and discharge of heavy metal pollutants in fields such as mining, metal smelting, electroplating industry, ch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/40C09K17/00B09C1/00B09C1/08C09K101/00
CPCB09C1/08B09C2101/00C09K17/40C09K2101/00
Inventor 董志刚张伟锋席北斗赵颖刘文芳李晓光郭祎阁彭星
Owner 佑景天(北京)国际水环境研究中心有限公司
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