Comprehensive treatment method for restoring heavy metal-polluted soil by plants and device

A technology for plant restoration and comprehensive treatment, which is applied in the field of heavy metal stabilization and recycling, can solve problems such as energy utilization of plants that do not involve heavy metal restoration in soil, and achieves the effects of simple structure, easy amplification, and avoidance of secondary pollution.

Active Publication Date: 2010-05-12
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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Problems solved by technology

[0007] None of the above patents involves the energy utilization of soil heavy metal restoration plants and the stabilization of heavy metals by thermochemical methods

Method used

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  • Comprehensive treatment method for restoring heavy metal-polluted soil by plants and device
  • Comprehensive treatment method for restoring heavy metal-polluted soil by plants and device
  • Comprehensive treatment method for restoring heavy metal-polluted soil by plants and device

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Experimental program
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Embodiment 1

[0035] The subject equipment of the present invention comprises:

[0036] Fixed bed gasifier 3 is used for the gasification of soil heavy metal remediation plants, high-temperature cracking of tar in gasification gas products, and sintering of gasification ash to stabilize heavy metals in gasification ash;

[0037] Entrained bed 11, the gasification gas products of soil heavy metal remediation plants, water vapor, oxygen-enriched air and auxiliary fuel are partially oxidized at high temperature in the entrained bed to produce chemical synthesis gas and melt the fly ash in the gasification gas products of soil heavy metal remediation plants Wherein, the synthesis gas outlet is arranged at the lower part of the entrained bed throat 16 to prevent the water vapor generated by the cooling water tank 15 from entering the entrained bed throat 16 when cooling the slag, which can fully prevent the slag from cooling and slagging at the throat 16.

[0038] Such as figure 1 Shown, a kind...

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Abstract

The invention discloses a comprehensive treatment method for restoring heavy metal-polluted soils by plants and a device thereof. The method comprises the steps: gasifying the plants for restoring heavy metal-polluted soils to form gasified cinders and gasified gaseous products, and introducing the gasified gaseous products into an entrained flow bed together with auxiliary fuels, water vapour and oxygenized air for obtaining chemical synthesis gas and slag; sending the chemical synthesis gas to a subsequent procedure for use after cooling, and cooling the slag for obtaining water cooling slag; and recycling heavy metals when cooling water enriched with heavy metal is precipitated and chemically extracted. In the invention, salvaged materials are fully utilized into resources by adopting new production technology, and simultaneously secondary pollution is avoided; the H2 and CO in chemical synthesis gas is finally obtained and can be adjusted between 1 to 3 so as to meet the requirements on different synthesis technology; and the adaptability is stronger, the structure is simple, compact and easy to be enlarged.

Description

technical field [0001] The invention relates to the technical field of environmental engineering, in particular to a method and a device for utilizing soil heavy metals to repair plants for energy utilization and for stabilizing and recycling heavy metals in soil heavy metals repairing plants. Background technique [0002] Heavy metal pollution is one of the most widely polluted and most harmful environmental problems in today's soil pollution. In the past fifty years, roughly 22,000 tons of cadmium, 783,000 tons of lead, and 1,350,000 tons of zinc have been discharged into the global environment according to rough statistics. Phytoremediation technology achieves the purpose of reducing the content of heavy metals in the soil by planting and harvesting plants with strong tolerance and enrichment ability to heavy metals. It has the advantages of safety, economy, and high efficiency, and has gradually developed into one of the important ways of pollution control. Now Has ente...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B5/00B09B3/00B09C1/10
Inventor 赵增立王小波李海滨夏娟娟
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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