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Heavy metal contaminated soil restorative agent as well as preparation method thereof and application thereof

A soil remediation agent and a technology for polluted soil, which is applied in the field of heavy metal contaminated soil remediation agent and its preparation, can solve the problems of high processing cost, soil structure damage, and low remediation efficiency, so as to avoid environmental pollution, simple preparation method and effective treatment Good results

Inactive Publication Date: 2016-07-13
CHANGSHA HUIJU ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 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

[0052] 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:

[0053] (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);

[0054] (b) Preparation of soil remediation agent: use straw as raw material, vacuum pyrolyze for 30 minutes under the conditions of system pressure of 3kPa and pyrolysis temperature of 500°C, grind to obtain solid particles below 3mm, and make biochar; obtained as Powdered quicklime below 2mm; obtain 13X type molecular sieve with a particle size range of 1-3mm; obtain sodium-based bentonite with...

Embodiment 2

[0067] 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:

[0068] (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);

[0069] (b) Preparation of soil remediation agent: using a mixture of straw, wood chips, and peanut shells (mass percentage 40%:30%:30%) as raw materials, vacuum pyrolysis under the conditions of a system pressure of 3kPa and a pyrolysis temperature of 500°C 30min, grind to obtain solid particles below 3mm, and make biochar; obtain powdered quicklime below 2mm; obtain MCM-41 molecular sieves with...

Embodiment 3

[0082] 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:

[0083] (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);

[0084] (b) Preparation of soil remediation agent: using a mixture of straw, wood chips, and peanut shells (mass percentage 40%:30%:30%) as raw materials, vacuum pyrolysis under the conditions of a system pressure of 3kPa and a pyrolysis temperature of 500°C 30min, grind to obtain solid particles below 3mm, and make biochar; obtain powdered quicklime below 2mm; obtain 13X molecular sieves with a ...

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Abstract

The invention provides a heavy metal contaminated soil restorative agent. The restorative agent is prepared from the following components in weight ratio: 20-30 percent of biomass charcoal, 30-50 percent of quick lime, 10-20 percent of molecular sieve, 10-20 percent of sodium bentonite, 1-10 percent of polyepoxysuccinic acid and 1-10 percent of sodium lignin sulfonate. A preparation method for the heavy metal contaminated soil restorative agent comprises the following steps: firstly, mixing the biomass charcoal, quick lime, molecular sieve, sodium lignin sulfonate and sodium bentonite in mass ratio to obtain a mixture; and then, adding the polyepoxysuccinic acid into the mixture in mass ratio to stir and uniformly mix, thereby obtaining the prepared soil restorative agent. The prepared soil restorative agent has good effect in restoring the cadmium, lead and zinc compound contaminated soil.

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 its preparation method and application. technical background: [0002] Soil heavy metal pollution has gradually become the focus of public attention. [0003] 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 n...

Claims

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Application Information

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IPC IPC(8): C09K17/40B09C1/08
CPCC09K17/40B09C1/08
Inventor 周益辉
Owner CHANGSHA HUIJU ENVIRONMENTAL TECH CO LTD
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