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Steam heat-enhanced extraction method of volatile/semi-volatile organic contaminated soil

A semi-volatile, organic pollution technology, applied in the restoration of contaminated soil, etc., can solve the problems of high thermal desorption cost, low efficiency, and long time-consuming gas phase extraction technology, and achieve strong operability and clean discharge , The effect of facilitating on-site monitoring

Active Publication Date: 2019-04-16
SHANGHAI ACADEMY OF ENVIRONMENTAL SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies of the existing volatile / semivolatile organic contaminated soil remediation technology, solve the problems of the existing gas phase extraction technology, such as long time consumption, low efficiency, and high cost of thermal desorption; provide a low-cost A steam-heat-enhanced extraction method that can handle large quantities of volatile / semivolatile organic-contaminated soils

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The steam heat intensified extraction test of xylene in embodiment 1 soil

[0017] The concentration of xylene in the polluted soil is 33.6mg / kg, measure and locate the polluted area, and dig out the polluted soil. Cover with excavation to prevent the spread of pollutants and dust. Transport the contaminated soil from the excavated area to the designated restoration site, build a plastic greenhouse to cover the contaminated site, and lay geotextiles; use mechanical equipment such as forklifts to pile the soil into long strips of soil. The specifications of the strip-shaped soil pile are: the length of the bottom surface is 30m, the width is 9m, the slope ratio is 1.5, and the soil height is 4m. A single soil pile covers an area of ​​274 square meters and can hold 604 cubic meters of soil; hot air input: steam hot air blower The air outlet is connected with the inlet of the ventilation pipeline, the air pressure of the steam hot air blower is 6KPa, and the air volume is...

Embodiment 2

[0018] Embodiment 2 The steam heat intensified extraction test of benzene in soil

[0019] The concentration of benzene in the polluted soil is 42.7mg / kg, measure and locate the polluted area, and dig out the polluted soil. Cover with excavation to prevent the spread of pollutants and dust. Transport the contaminated soil from the excavated area to the designated restoration site, build a plastic greenhouse to cover the contaminated site, and lay geotextiles; use mechanical equipment such as forklifts to pile the soil into long strips of soil. The specifications of the strip-shaped soil pile are: the length of the bottom surface is 30m, the width is 9m, the slope ratio is 1.5, and the soil height is 4m. A single soil pile covers an area of ​​274 square meters and can hold 604 cubic meters of soil; hot air input: steam hot air blower The air outlet is connected with the inlet of the ventilation pipeline, the air pressure of the steam hot air blower is 6KPa, and the air volume ...

Embodiment 3

[0020] Example 3 The steam heat enhanced extraction test of 1,2-dichloroethane in soil

[0021] The concentration of 1,2-dichloroethane in the polluted soil is 12.8mg / kg, measure and locate the polluted area, and dig out the polluted soil. Cover with excavation to prevent the spread of pollutants and dust. Transport the contaminated soil from the excavated area to the designated restoration site, build a plastic greenhouse to cover the contaminated site, and lay geotextiles; use mechanical equipment such as forklifts to pile the soil into long strips of soil. The specifications of the strip-shaped soil pile are: the length of the bottom surface is 30m, the width is 9m, the slope ratio is 1.5, and the soil height is 4m. A single soil pile covers an area of ​​274 square meters and can hold 604 cubic meters of soil; hot air input: steam hot air blower The air outlet is connected with the inlet of the ventilation pipeline, the air pressure of the steam hot air blower is 6KPa, and...

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Abstract

The invention discloses a steam heat assisted extracting method for volatile / semi-volatile organic polluted soil in soil. The method comprises the following steps of constructing a remediation device at a polluted field, wherein the remediation device comprises a steam air heater, a ventilating pipeline, an extraction pipeline, a condenser, an air-liquid separator, an exhaust fan, a sewage storing box, a combustion furnace, an alkali liquor spraying tower and an activated carbon absorbing tower; piling the polluted soil into a long-strip-shaped soil stack; performing steam heat assisted ventilating to supply heat to the polluted soil through the steam air heater and the ventilating pipeline, thus increasing the temperature of the soil and the steam pressure of pollutants under the heating effect; separating out pollutants from the soil through the extracting pipeline; exhausting the pollutant-carrying air through the exhaust fan after the soil is volatilized; and then exhausting the air through the condenser, the air-liquid separator, the combustion furnace, the alkaline liquor spraying tower and the activated carbon absorbing tower. The method is high in operability, and high in extraction efficiency; the field monitoring can be carried out conveniently; the extraction efficiency is greater than that of the field extraction; the clean exhaust is achieved.

Description

technical field [0001] The invention relates to a steam heat-enhanced extraction method for volatile / semi-volatile organic pollutants in soil, which can be applied to the restoration of soil polluted by volatile / semi-volatile organic compounds. The invention belongs to the practical technical field of gas phase extraction. Background technique [0002] Soil is one of the important natural environments on which human beings depend. With the rapid development of industry and agriculture, the problem of volatile / semi-volatile organic pollution in soil has become increasingly prominent, and soil pollution remediation has received increasing attention. Research on the use of efficient and low-cost remediation technologies plays an important role in promoting the remediation of volatile / semivolatile organic contaminated soils. At present, the remediation technology reports on soil volatile / semi-volatile organic pollution mainly include gas phase extraction, thermal desorption, ce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/06
CPCB09C1/06
Inventor 朱江杨洁李炳智张施阳吉敏陈龙林锦林小小涂宝声
Owner SHANGHAI ACADEMY OF ENVIRONMENTAL SCIENCES
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