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Soil heavy metal passivator and preparation method and application thereof

The technology of a heavy metal passivator and soil remediation agent is applied in the field of soil pollution remediation, which can solve the problems of loss of nutrient elements, damage to soil structure, and high treatment costs, and achieve the effects of increasing adsorption capacity, high adsorption value, and avoiding environmental pollution.

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

[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

[0038] 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:

[0039] (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);

[0040] (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 obtain biochar powder with a particle size of 3 mm or less through grinding; obtain α-cyclodextrin, z...

Embodiment 2

[0054]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:

[0055] (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);

[0056] (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 obtain biochar powder with a particle size of 3 mm or less through grinding; obtain α-cyclodextrin, ze...

Embodiment 3

[0070] 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:

[0071] (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);

[0072] (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 obtain biochar powder with a particle size of 3 mm or less through grinding; obtain α-cyclodextrin, z...

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Abstract

The invention provides a heavy metal polluted soil remediation agent which is prepared from, by weight, 30-50% of biomass charcoal, 10-30% of alpha-cyclodextrins, 10-20% of zeolite, 5-10% of polyacrylamide, 5-10% of glucose and 5-10% of sodium sulphide. The preparation method comprises the steps that the biomass charcoal, the alpha-cyclodextrins, the zeolite, the polyacrylamide, the glucose and the sodium sulphide are evenly mixed according to the mass ratio, and therefore the soil remediation agent is prepared. The obtained soil remediation agent has the good effect on remedying cadmium, lead, zinc and copper composite polluted soil, and has the advantages that the method is simple and feasible, and the treatment effect is good.

Description

Technical field: [0001] The invention belongs to the technical field of soil pollution remediation, and in particular relates to a soil heavy metal passivator 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 national soil is 16.1...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40B09C1/08C09K109/00
CPCB09C1/08C09K17/40C09K2109/00
Inventor 周益辉
Owner CHANGSHA HUIJU ENVIRONMENTAL TECH CO LTD
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