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Novel thermal desorption restoring system and novel thermal desorption restoring method for treating POPs (persistent organic pollutants) polluted soil

A technology for contaminated soil and remediation systems, applied in the field of new thermal desorption remediation systems, can solve the problems of few and few application technologies, and achieve the effects of saving energy, high economic benefits, and simplifying the remediation process.

Inactive Publication Date: 2015-07-01
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although in recent years, a variety of technologies for remediation of POPs-contaminated soil have been continuously researched and developed, but there are not many applied technologies with real practical value, and considering factors such as treatment cost, treatment time, and energy consumption, they can be used for actual POPs-contaminated site remediation , and there are very few technologies that can achieve better restoration results

Method used

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  • Novel thermal desorption restoring system and novel thermal desorption restoring method for treating POPs (persistent organic pollutants) polluted soil
  • Novel thermal desorption restoring system and novel thermal desorption restoring method for treating POPs (persistent organic pollutants) polluted soil
  • Novel thermal desorption restoring system and novel thermal desorption restoring method for treating POPs (persistent organic pollutants) polluted soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A novel thermal desorption repair system for treating POPs polluted soil, the novel thermal desorption repair system includes a thermal desorption treatment system and a tail gas treatment system; the thermal desorption treatment system includes a constant temperature device and a reaction device, the reaction The device is placed in a constant temperature device; the tail gas treatment system includes a soil adsorption column, a water collection part, a cooling part, a charcoal adsorption column and XAD resin, and the devices in the above tail gas treatment system are connected through communication parts; the thermal desorption The treatment system and the tail gas treatment system are connected through communication components. Further, the connecting part is a polytetrafluoroethylene hose or a glass tube.

[0035] XAD resin is an aromatic hydrocarbon polymer (also known as: macroporous adsorption resin or fully porous resin), widely used in hydrophobic compounds; se...

Embodiment 2

[0051] This embodiment is a preferred scheme based on Example 1, and the novel thermal desorption restoration for the treatment of POPs-contaminated soil includes the following steps:

[0052] 1. New thermal desorption treatment process

[0053] (1) Weigh 50g of sand, 25g of charcoal and 75g of soil (charcoal accounts for 25%) and mix the charcoal and soil evenly to obtain a soil charcoal mixture;

[0054] (2) Transfer the sand to the reaction tube, spread it flat, and use a ruler to measure the distance from the upper end of the reaction tube to the sand and record it;

[0055] (3) Pour the mixed soil charcoal mixture into the reaction tube, spread it flat, and measure the distance to the upper end, and record;

[0056] (4) After filling the soil charcoal mixture, fix the reaction tube in the incubator, insert the induction tubes of thermocouples at equal intervals according to the height of the sample in the reaction tube, and measure the temperature changes of different sa...

Embodiment 3

[0077] This example is a preferred solution based on Examples 1 and 2. This example is a new type of thermal desorption treatment for organochlorine pesticides (OCPs) polluted soil. Before the treatment, the concentration of organochlorine pesticides (OCPs) polluted soil is : 16 mg kg -1 , the components mainly include: hexachlorobenzene (HCB), DDT (DDT) and hexahexazone (HCHs).

[0078] The thermal desorption repair method refers to Example 2.

[0079] (1) Processing efficiency

[0080] After thermal desorption treatment, the residual amount of OCPs in the soil is only: 0.25-0.46 mg kg -1 , The degradation rate can reach more than 97%.

[0081] (2) Content of pollutants in exhaust gas

[0082] After thermal desorption treatment, the concentration of OCPs in the tail gas is 0.02-0.06 mg Nm -3 Within the range, no more toxic organic pollutants such as dioxin were detected.

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Abstract

The invention provides a novel thermal desorption restoring method for treating POPs (persistent organic pollutants) polluted soil. The charcoal which is low in price is used for substituting active carbon to be used as a tail gas adsorption agent, the charcoal is mixed with the polluted soil to be used as a combustion heat source for supplying heat for the thermal desorption treatment on the soil, no additional external heat is needed except for the ignition of a carbide in the thermal desorption process, and the ignited soil can be spontaneously restored. In addition, in order to avoid the generation of secondary pollutants, a continuous restoring model is established, so that the adsorbed charcoal can be remixed with the polluted soil to be used as a combustion heat source for the next thermal desorption reaction so as to be recycled, and finally, a purpose for effectively, economically and environmentally restoring the POPs polluted soil can be realized. Each sample after the heat treatment is extracted by utilizing an acceleration solvent extraction method, then the sample is acidified by virtue of sulfuric acid and purified by a multilayer chromatographic column, and finally, the restoration treatment effect is verified by utilizing an analysis test means such as GC-MS (Gas Chromatography-Mass Spectrometer) combination.

Description

technical field [0001] The invention belongs to the field of soil restoration, and in particular relates to a novel thermal desorption restoration system and method for treating polluted soil. Background technique [0002] The new thermal desorption technology for treating POPs-contaminated soil is developed based on the optimization and improvement of the traditional thermal desorption technology and combined with the sintering process. Although the traditional thermal desorption technology has the advantages of high remediation efficiency, stable reaction process and relatively simple operation, it still has the disadvantages of high energy consumption and high treatment cost in the process of treating actual POPs-contaminated soil, and will generate Secondary pollutants, such as: chlorobenzene, dioxin, etc., if the tail gas is not properly treated or the adsorbent is saturated, it is very easy to discharge excessive pollutants into the atmosphere, causing damage to the su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/06B01D53/02
Inventor 赵龙侯红李佳朱腾飞李发生
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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