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Technology for restoring polychlorinated biphenyls (PCBs) polluted site through solvothermal method

A solvothermal method and site technology, applied in the restoration of contaminated soil, etc., to achieve good application prospects, reduce transportation costs, and easy operation

Inactive Publication Date: 2011-11-23
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a new process for quickly extracting organic pollutants in PCBs-contaminated soil to realize the reclamation and reuse of such soil in view of the shortcomings of the existing PCBs-contaminated site remediation technology

Method used

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  • Technology for restoring polychlorinated biphenyls (PCBs) polluted site through solvothermal method
  • Technology for restoring polychlorinated biphenyls (PCBs) polluted site through solvothermal method
  • Technology for restoring polychlorinated biphenyls (PCBs) polluted site through solvothermal method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The process of repairing PCBs contaminated sites by solvothermal method specifically includes the following steps:

[0017] refer to figure 1 Technological process, the clean soil is mixed and dried at room temperature, crushed and passed through an 80-mesh sieve to ensure uniform particle size. Pipette 1ml of diluted capacitor oil (18ppm, Aroclor 1242) and transformer oil (60ppm, Aroclor 1260) as pollution sources, mix with 1g of soil, add n-hexane to fully saturate the soil (soak), and place in a constant temperature shaking box at 20°C Shake to mix the sample evenly. After 48 hours, the n-hexane in the sample was evaporated to dryness at room temperature, and stored in a dark, ventilated place for future use. Put the obtained artificial PCBs-contaminated soil into a hydrothermal reaction kettle, and add 15ml of isopropanol. Put the sealed kettle in an oven, turn on the heating device, raise the temperature to 150° C., and keep the temperature at a constant tempera...

Embodiment 2

[0019] The process of repairing PCBs contaminated sites by solvothermal method specifically includes the following steps:

[0020] according to figure 1 Process flow: Mix and dry the PCBs contaminated soil at the waste transformer dismantling site at room temperature, crush it and pass it through an 80-mesh sieve, put it into a hydrothermal reaction kettle, and add 15ml of isopropanol. Put the sealed kettle in an oven, turn on the heating device, raise the temperature to 150° C., and keep the constant temperature for 8 hours until the reaction ends. After the reaction kettle is cooled, the supernatant in the kettle is collected, which is the isopropanol extract, and the isopropanol is recovered by distillation. The concentrated PCBs are purified by sulfuric acid, copper powder vibration to remove sulfur, silicon magnesium adsorbent purification, GC -MS analysis shows that the concentration of PCBs in the extract is 564ppm; while using the traditional Soxhlet extraction method...

Embodiment 3

[0022] The process of repairing PCBs contaminated sites by solvothermal method specifically includes the following steps:

[0023] Mix and dry the actual PCBs-contaminated soil at room temperature, crush it and pass through an 80-mesh sieve, put it into a hydrothermal reaction kettle, and add 15ml of isopropanol. Put the sealed kettle in an oven, turn on the heating device, raise the temperature to 150° C., and keep the temperature at a constant temperature for 10 hours until the reaction is completed. After the kettle is cooled, the supernatant in the kettle is collected, which is the isopropanol extract, and the isopropanol is recovered by distillation. The concentrated PCBs are purified by sulfuric acid, copper powder vibration to remove sulfur, silicon magnesium adsorbent purification, GC- According to MS analysis, the extraction amount of PCBs was 754ppm, and the recovery rate of PCB209 was 80%, meeting the requirements of EPA8082. The content of PCBs in the treated soil...

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PUM

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Abstract

In view of the actuality of large PCBs polluted site area, serious contamination, difficult restoration and shortage of restoration technology in our country, the invention provides a new technology for rapid extraction of persistent organic pollutants from polluted soil so as to realize the reclamation and reuse of such soil. The technology is characterized in that: in an airtight reaction kettle, a special organic solvent is employed as the extracting agent, and by taking advantage of the characteristic that the solvent can rapidly dissolve organic pollutants under an increased temperature and an increased pressure, the efficient separation of the organic pollutants and soil can be realized. The technology of the invention has the advantages of simple operation, short process, high efficiency, small amount of solvent consumption and the like, and the treated soil changes little in the content of organic matters, thus being applicable for backfilling and reclamation.

Description

technical field [0001] The invention relates to the remediation and remediation of polychlorinated biphenyls (PCBs) polluted sites, which belongs to the new technology of solid waste treatment in the field of environmental protection and comprehensive utilization of resources, and is especially suitable for the harmless treatment of various organic polluted wastes and the remediation of polluted sites. Ken. Background technique [0002] PCBs have high accumulation, persistence, and long-distance transmission. Over the years, they have attracted extensive attention from governments, academia, industry, and the public, and have become a global environmental problem that has attracted much attention. At present, extensive research on dioxin-like pollutants is being carried out around the world, mainly focusing on its ecotoxicology and health effects, environmental pollution control and treatment, and related physical and chemical basis to ensure the safety of human living envir...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/06B09C1/02
Inventor 张付申张聪聪
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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