Zinc and organic matter polluted soil repairing method

A technology for contaminated soil and organic matter, applied in the field of zinc and organic matter-contaminated soil remediation, to achieve the effects of high mechanical strength, short process flow and smooth surface

Inactive Publication Date: 2019-02-05
CHANGSHA HUIJU ENVIRONMENTAL TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The technical problem to be solved by the present invention is: for the zinc and organic matter in the compound-contaminated soil of metal zinc and organic matter, carry out strong chemical transformation, high temperature enhanced decomposition, and tempering treatment to realize the separation of zinc and organic matter

Method used

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  • Zinc and organic matter polluted soil repairing method

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Embodiment 1

[0028] Take the soil from the complex pollution site of zinc and organic matter, remove sand and gravel, and crush the soil to obtain 1kg of 2-5mm soil particles; put the treated soil particles into 0.1mol / L dilute hydrochloric acid solution, and fully stir the reaction. The zinc compound in the soil is converted into zinc chloride, and then the soil is filtered out from the dilute hydrochloric acid solution and dried; 50g of fly ash and 80g of activated alumina are added to the soil, mixed and stirred evenly, and then sent to a vacuum stirring pyrolysis device. The system pressure is 1KPa, the stirring speed is 300rpm, heated to 740°C, continuously stirred and turned, and kept for 30 minutes; the zinc chloride in the soil volatilizes under high temperature conditions, and is separated from the voids in the soil, and is decomposed and volatilized together with the organic matter. Pull out the vacuum stirring pyrolysis device and collect in the condenser; grind the treated soil,...

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Abstract

The invention provides a zinc and organic matter polluted soil repairing method. Firstly, soil of the zinc and organic matter composite polluted site is taken, sand stone is removed, the soil is subjected to crushing treatment, and 2-5 mm of soil particles are obtained; the soil particles are thrown into a diluted hydrochloric acid solution to be sufficiently stirred, and filtering-out and dryingare conducted; coal ash and activated aluminum oxide are added, mixing and stirring are evenly conducted, the mixture is conveyed into a vacuum stirring pyrolysis device, heating is conducted to 740-750 DEG C, stirring and overturning are constantly conducted, and heat preservation is conducted for 30 min; zinc chloride in the soil is volatilized under the condition of the high temperature and isseparated from gaps in the soil to be pumped away from the vacuum stirring pyrolysis device together with organic matter decomposed and volatilized at the same time, and collection is achieved in a condenser; and the treated soil is subjected to grinding treatment, calcium oxide and potassium humate are added for conducting mixing and stirring treatment, and the repaired soil is obtained. According to the zinc and organic matter polluted soil repairing method, in the process, energy saving and environment friendliness are achieved, safety and high efficiency are achieved, the technology process is short, little project equipment is needed, the soil can be directly utilized after being repaired, and the zinc and organic matter polluted soil repairing method can be an example for popularization and application.

Description

Technical field: [0001] The invention relates to a method for remediating soil polluted by zinc and organic matter, and belongs to the technical field of soil remediation in the field of environmental protection. technical background: [0002] Soil heavy metal pollution is an urgent environmental problem in my country. [0003] The pollution of zinc element to soil, zinc in soil can be divided into water-soluble zinc, substitutional zinc, insoluble zinc (zinc in minerals) and organic zinc. Zinc in soil comes from various soil-forming minerals. The weathered zinc enters the soil solution in the form of Zn2+, mainly zinc sulfide, zinc oxide or zinc hydroxide. Zinc ions and zinc-containing complex ions participate in the substitution reaction in the soil, and often have the phenomenon of adsorption and fixation. The enrichment of zinc in the soil will inevitably lead to the enrichment in plants. This enrichment is not only harmful to plants, but also to people and animals wh...

Claims

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Application Information

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IPC IPC(8): B09C1/06B09C1/08
CPCB09C1/065B09C1/08
Inventor 不公告发明人
Owner CHANGSHA HUIJU ENVIRONMENTAL TECH CO LTD
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