Heavy metal cadmium and lead composite polluted soil restoration agent and preparing method thereof

A soil remediation agent and composite pollution technology, which is applied in the field of heavy metal cadmium lead composite contaminated soil remediation agent and its preparation, can solve the problems of nutrient element loss, soil structure damage, and low repair efficiency, and achieve increased adsorption capacity, easy adsorption, The effect of high adsorption value

Inactive Publication Date: 2016-07-06
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

[0034] 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:

[0035] (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);

[0036] (b) Preparation of soil remediation agent: use the mixture of straw and calcium oxide as raw material, the mass ratio of straw and calcium oxide is 20:1, and heat it in vacuum under the conditions of system pressure of 20kPa and pyrolysis temperature of 500°C Decompose for 30 minutes, and the particle size obtained by grinding is biochar powder below 3mm; prepare powdered diatomite, ferro...

Embodiment 2

[0050] 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:

[0051] (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);

[0052] (b) Preparation of soil remediation agent: use the mixture of straw and calcium oxide as raw material, the mass ratio of straw and calcium oxide is 20:1, and heat it in vacuum under the conditions of system pressure of 20kPa and pyrolysis temperature of 500°C Decompose for 30 minutes, and the particle size obtained by grinding is biochar powder below 3mm; prepare powdered diatomite, ferro...

Embodiment 3

[0066] 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:

[0067] (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);

[0068] (b) Preparation of soil remediation agent: use the mixture of straw and calcium oxide as raw material, the mass ratio of straw and calcium oxide is 20:1, and heat it in vacuum under the conditions of system pressure of 20kPa and pyrolysis temperature of 500°C Decompose for 30 minutes, and the particle size obtained by grinding is biochar powder below 3mm; prepare powdered diatomite, ferro...

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Abstract

The invention provides a heavy metal cadmium and lead composite polluted soil restoration agent.The restoration agent is prepared from, by weight, 30-50% of biomass charcoal, 5-10% of kieselguhr, 20-30% of ferrous sulfate, 5-10% of starch and 10-20% of chitosan.According to the preparing method, the biomass charcoal, the kieselguhr, ferrous sulfate, the starch and chitosan are mixed according to the mass ratio, and stirred fully and uniformly to obtain the prepared soil restoration agent.The prepared soil restoration agent has a good effect when restoring cadmium and lead composite polluted soil.

Description

Technical field: [0001] The invention belongs to the technical field of soil pollution remediation, and in particular relates to a heavy metal cadmium-lead composite polluted 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40B09C1/08
CPCC09K17/40B09C1/08
Inventor 周益辉
Owner CHANGSHA HUIJU ENVIRONMENTAL TECH CO LTD
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