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Heavy metal-contaminated soil remediation agent and preparation method thereof

A technology for polluted soil and remediation agent, applied in the field of soil pollution remediation, can solve the problems of loss of nutrients, damage to soil structure, low remediation efficiency, etc., and achieve the effect of high adsorption value, easy adsorption, and reduced concentration

Inactive Publication Date: 2016-05-11
CHANGSHA HUIJU ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the treatment methods for soil heavy metal pollution mainly include immobilization / stabilization, leaching, soil washing, electrokinetic remediation, chemical reduction, phytoremediation, and microbial remediation. There are generally problems such as low remediation efficiency and high treatment costs.
Traditional remediation methods such as landfill, leaching, electrochemistry, etc. have a large amount of engineering, high cost, and often lead to soil structure damage and loss of some nutrients

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The test soil was collected from a heavy metal-polluted area, and the heavy metal content in the soil surface of this area was higher than the third-level standard of the "Soil Environmental Quality Standard" (GB15618-1995). Repair according to the actual situation of pollution:

[0048] (a), take a sample from the soil, and detect the concentration of heavy metals in the soil before remediation by using an overturning oscillator to perform a leaching test on the soil according to the solid waste "Leach Toxicity Leaching Method Sulfuric Acid Nitric Acid Method" (HJ / T299-2007);

[0049] (b) Preparation of soil remediation agent: obtain powdered quicklime below 2 mm; use straw as raw material, vacuum pyrolyze for 30 minutes at a system pressure of 3 kPa and a pyrolysis temperature of 500 ° C, and grind to obtain solid particles below 3 mm , to make biochar with a particle size of less than 3mm; obtain sodium bentonite with an alkalinity coefficient greater than 1, a montm...

Embodiment 2

[0065] The test soil was collected from a heavy metal-polluted area, and the heavy metal content in the soil surface of this area was higher than the third-level standard of the "Soil Environmental Quality Standard" (GB15618-1995). Repair according to the actual situation of pollution:

[0066] (a), take a sample from the soil, and detect the concentration of heavy metals in the soil before remediation by using an overturning oscillator to perform a leaching test on the soil according to the solid waste "Leach Toxicity Leaching Method Sulfuric Acid Nitric Acid Method" (HJ / T299-2007);

[0067] (b) Preparation of soil remediation agent: obtain powdered quicklime below 2 mm; use straw as raw material, vacuum pyrolyze for 30 minutes at a system pressure of 3 kPa and a pyrolysis temperature of 500 ° C, and grind to obtain solid particles below 3 mm , to make biochar with a particle size of less than 3mm; obtain sodium bentonite with an alkalinity coefficient greater than 1, a montm...

Embodiment 3

[0083] The test soil was collected from a heavy metal-polluted area, and the heavy metal content in the soil surface of this area was higher than the third-level standard of the "Soil Environmental Quality Standard" (GB15618-1995). Repair according to the actual situation of pollution:

[0084] (a), take a sample from the soil, and detect the concentration of heavy metals in the soil before remediation by using an overturning oscillator to perform a leaching test on the soil according to the solid waste "Leach Toxicity Leaching Method Sulfuric Acid Nitric Acid Method" (HJ / T299-2007);

[0085] (b) Preparation of soil remediation agent: obtain powdered quicklime below 2 mm; use straw as raw material, vacuum pyrolyze for 30 minutes at a system pressure of 3 kPa and a pyrolysis temperature of 500 ° C, and grind to obtain solid particles below 3 mm , to make biochar with a particle size of less than 3mm; obtain sodium bentonite with an alkalinity coefficient greater than 1, a montm...

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Abstract

The invention provides a heavy metal-contaminated soil remediation agent. The remediation agent is prepared from, by weight, 30%-45% of quick lime, 10%-25% of biomass charcoal, 10%-15% of kieselguhr, 10%-15% of sodium bentonite, 10%-15% of activated aluminum oxide, 5%-10% of nitrilotriacetic acid, 1%-5% of sodium lignin sulfonate and 1%-5% of sodium dodecyl sulfate. A preparation method comprises the steps that the quick lime, the biomass charcoal, the kieselguhr, the sodium bentonite, activated aluminum oxide, nitrilotriacetic acid, sodium lignin sulfonate and sodium dodecyl sulfate are stirred and mixed to be uniform according to the weight ratio, and then the soil remediation agent is prepared. The prepared soil remediation agent has the good effect when cadmium-lead-zinc-mercury compound contaminated soil is remedied.

Description

Technical field: [0001] The invention belongs to the technical field of soil pollution remediation, and in particular relates to a heavy metal contaminated soil remediation agent and a preparation method thereof. technical background: [0002] According to the "National Soil Pollution Survey Bulletin" issued by the Ministry of Environmental Protection and the Ministry of Land and Resources in 2014, the overall situation of the national soil environment is not optimistic, the soil pollution in some areas is relatively serious, the quality of the soil environment of cultivated land is worrying, and the soil environment problems of industrial and mining wasteland are prominent. . Man-made activities such as industry, mining, agriculture, and high background values ​​of the soil environment are the main causes of soil pollution or exceeding standards. The total exceeding rate of national soil is 16.1%, of which the proportions of slightly, lightly, moderately and heavily pollut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40C09K109/00
CPCC09K17/40C09K2109/00
Inventor 周益辉
Owner CHANGSHA HUIJU ENVIRONMENTAL TECH CO LTD
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