Concentrated combustion type in-situ thermal desorption repairing method for contaminated site

Abstract

The invention discloses a concentrated combustion type in-situ thermal desorption repairing method for a contaminated site. A concentrated combustion type in-situ thermal desorption repairing device is arranged and used for conducting repairing. The concentrated combustion type in-situ thermal desorption repairing device comprises a combustion heat transferring and waste heat recovery unit, an extraction condensation and gas-liquid separation unit, an underground water flow control unit, a soil gas control unit, a waste gas treatment unit and a waste water treatment unit. The combustion heat transferring and waste heat recovery unit comprises an air heating furnace, a gas-gas heat exchanger, an air blower, an induced draft fan, an exhaust funnel and a heating well group. The extraction condensation and gas-liquid separation unit comprises an extraction well group, heat exchanging and condensation equipment, gas-liquid separation equipment, a demist tower and a vacuum pump. The waste gas treatment unit comprises adsorption equipment and a draught fan, and the waste water treatment unit comprises an adjusting pool, a combination pool, sand filtering equipment, carbon filtering equipment and a water outlet pool. According to the concentrated combustion type in-situ thermal desorption repairing method for the contaminated site, defects of the prior art can be overcome, and a betterrepairing effect is achieved.

Description

technical field [0001] The invention relates to a method for remediating polluted sites, in particular to a centralized combustion in-situ thermal desorption repairing method for polluted sites. Background technique [0002] Thermal Desorption technology can be widely used in in-situ or ex-situ remediation of volatile organic compounds, semi-volatile organic compounds, petroleum hydrocarbons or mercury-contaminated sites. This technology heats the polluted soil and / or groundwater to close to or even exceed the boiling point of the target pollutant by means of direct or indirect heating, and selectively promotes the desorption, gasification, volatilization, Decompose or increase its mobility, so that the target pollutants can be separated from the soil medium and removed, so as to achieve the purpose of remediation of contaminated sites. [0003] The in-situ thermal desorption remediation technology can be implemented in situ on the polluted site without excavating the pollu...

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Problems solved by technology

[0004] At present, the engineering application of in-situ thermal desorption remediation technology in the remediation of domestic contaminated sites is still relatively limited. The geological conditions of the site and the upper limit of the target temperature limit, the energy cost required for in-situ heating is high, the groundwater flow of the site is not easy to control, the desorbed soil gas is not easy to be effectively captured and escapes to pollute the environment, and the condensation and recovery efficiency of the extracted pollutants is relatively low. Various difficulties such as low and high humidity waste gas generated are difficult to handle, and the nature of waste water is complex and difficult to handle.

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