Thermal desorption repair method and system for organic matter polluted soil

Abstract

The invention discloses a thermal desorption repair method and system for organic matter polluted soil. The method comprises the following steps: firstly, pre-treating polluted soil; thermally desorbing the pre-treated soil after being measured; reducing the oil ratio of reduced soil after thermal desorption treatment to be smaller than 0.3% to pave roads, and make bricks or agricultural oil; directly cooling or indirectly cooling pyrolyzed gas obtained by thermal desorption through a fan; performing floating separation on a cooled oil-water mixture; recycling the separated organic matters; circularly cooling the pyrolyzed gas after the circulating water is cooled by air; and after two-stage rotational flow purification on noncondensable gas, doping the noncondensable gas into a fuel for resource utilization. The method disclosed by the invention can treat organic matter polluted soil harmlessly quickly, efficiently and continuously, a treatment process can be achieved by means of a skid mounted unit and automatic control, and no secondary pollution is generated in the treatment process, and meanwhile, resource utilization of recovered oil, noncondensable gas and reduced soil can be achieved, and better environmental, economical and social benefits can be generated.

Description

Technical field [0001] The invention belongs to the field of environmental protection treatment of solid (hazardous) waste such as sludge and other organic matter contaminated soil in the fields of oil and gas exploration, petrochemical industry, pharmaceuticals, etc., and relates to a method and system for repairing organic matter contaminated soil, and specifically relates to a thermal analysis A method and system for harmless remediation of soil contaminated by organic matter. Background technique [0002] Organic matter contaminated soil generally includes crude oil pipeline puncture pollution soil, floor sludge, tank bottom sludge, drilling mud and rock debris (crude oil, diesel, white oil pollution), organic chlorine contaminated soil, benzene series and derivatives (such as benzo ( a) Pyrene) polluted soil, etc. At present, there is a large stock of such pollutants in our country, and there is also a large amount of new increase every year. The direct discharge of these ...

AI Technical Summary

Problems solved by technology

Incineration treatment of organic matter-contaminated soil inevitably produces a large amount of air pollution, secondary pollution occurs during the treatment process, and the treatment is more complicated; the treatment effect of biological treatment is mostly limited by time and nature, and the treatment cycle is long and greatly affected by changes in the natural environment , some organic matter cannot be degraded well under natural conditions; both chemical washing and solvent extraction methods can repair organic matter-contaminated soil well, and at the same time realize the resource recovery and reuse of organic pollutants, but the Insufficient removal of organic pollutants

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