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Cadmium contaminated soil restoring agent and using method and application thereof

A technology for cadmium-contaminated soil and remediation agent, applied in the field of soil pollution remediation, can solve the problems of high treatment cost and low remediation efficiency, and achieve the effects of high adsorption value, improved physical and chemical properties, and abundant pores.

Inactive Publication Date: 2016-06-29
CHANGSHA HUIJU ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are generally problems such as low repair efficiency and high processing cost.

Method used

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  • Cadmium contaminated soil restoring agent and using method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation Embodiment 1

[0043] Using the mixture of straw and calcium oxide as raw material, the mass ratio of straw and calcium oxide is 20:1, vacuum pyrolysis for 30min under the conditions of system pressure of 20kPa and pyrolysis temperature of 500°C, the particles obtained by grinding Solid powder with a diameter of less than 3mm;

[0044] Obtain iron powder with particle size less than 1mm;

[0045] Obtain plant ash generated after straw burning;

[0046] Obtain sodium sulfide and zeolite powder with particle size less than 2mm;

[0047] Weigh according to mass percentage:

[0048] Biochar 40%;

[0049] Iron powder 15%;

[0050] Plant ash 15%;

[0051] Sodium sulfide 15%;

[0052] Zeolite 15%;

[0053] Then mix evenly to prepare the repairing agent.

preparation Embodiment 2

[0055] Using the mixture of straw and calcium oxide as raw material, the mass ratio of straw and calcium oxide is 20:1, vacuum pyrolysis for 30min under the conditions of system pressure of 20kPa and pyrolysis temperature of 500°C, the particles obtained by grinding Solid powder with a diameter of 3mm or less.

[0056] Obtain iron powder with particle size less than 1mm;

[0057] Obtain plant ash generated after straw burning;

[0058] Obtain sodium sulfide and zeolite powder with particle size less than 2mm;

[0059] Weigh according to mass percentage:

[0060] Biochar 50%;

[0061] Iron powder 20%;

[0062] Plant ash 10%;

[0063] Sodium sulfide 10%;

[0064] Zeolite 10%.

[0065] Then mix evenly to get the repair potion.

preparation Embodiment 3

[0067] Using the mixture of straw and calcium oxide as raw material, the mass ratio of straw and calcium oxide is 20:1, vacuum pyrolysis for 30min under the conditions of system pressure of 20kPa and pyrolysis temperature of 500°C, the particles obtained by grinding Solid powder with a diameter of 3mm or less.

[0068] Obtain iron powder with particle size less than 1mm;

[0069] Obtain plant ash generated after straw burning;

[0070] Obtain sodium sulfide and zeolite powder with particle size less than 2mm;

[0071] Weigh according to mass percentage:

[0072] Biochar 30%;

[0073] Iron powder 10%;

[0074] Plant ash 20%;

[0075] Sodium sulfide 20%;

[0076] Zeolite 20%.

[0077] Then mix evenly to get the repair potion.

[0078] Embodiment 1-3 gained restorative agent application specific implementation and technical effect:

[0079] 300 kg of cadmium-contaminated soil was taken from a farmland in Hengyang, Hunan.

[0080] (1) The content of available cadmium in th...

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Abstract

The invention provides a cadmium-contaminated soil remediation agent, which consists of the following components by weight ratio: 30-50% of biomass charcoal, 10-20% of iron powder, 10-20% of plant ash, 10-20% of sodium sulfide, Zeolite 10‑20%; the above components fully exert synergistic effects, and through reduction, precipitation, adsorption, improvement, and adjustment of PH value, the effective cadmium in the soil is greatly reduced, and the prepared soil remediation agent can be used to repair cadmium-contaminated soil. With good effect, the restoration agent of the present invention has the advantages of simple preparation method, feasibility and good treatment effect.

Description

Technical field: [0001] The invention relates to the technical field of soil pollution remediation, in particular to a cadmium-contaminated soil remediation agent and its use 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%, of which...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/02B09C1/08C09K101/00C09K109/00
CPCC09K17/02B09C1/08C09K2101/00C09K2109/00
Inventor 周益辉
Owner CHANGSHA HUIJU ENVIRONMENTAL TECH CO LTD
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