Tail gas purification method and device for thermal desorption of organic polluted soil

Abstract

The invention discloses a tail gas purification method and device for thermal desorption of organic contaminated soil. A cyclone dust collector and a spray tower are used for carrying out dedusting and spraying treatment on tail gas in sequence, and sprayed tail gas is subjected to defoaming, drying, activated carbon adsorption and the like, and then is emitted after reaching the standard after being combusted; spray liquid flows out from the lower end of the spray tower and is subjected to sedimentation treatment, and middle-layer liquid after sedimentation is filtered and then is directly used as liquid for spraying; most organic pollutants in waste water can be removed by the upper-layer liquid and the lower-layer liquid after standing sedimentation by virtue of a chemical oxidation reaction tank, and then residual organic pollutants can be removed through the manners of filter pressing, filtering, activated carbon adsorption and the like. According to the invention, for the sprayed waste liquid, degradation of the organic pollutants can be realized by the chemical oxidation effect, the organic pollutants can be removed in real sense instead of transfer of the organic pollutants, production of dangerous wastes in the process is reduced, and the tail gas purification method and device have the dual benefits of reducing disposal cost and environment risks.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a tail gas purification method and device for thermal desorption of organic polluted soil. Background technique [0002] Soil organic pollution refers to soil pollution caused by organic matter. Due to a series of factors such as the production and use of pesticides and other chemicals, the discharge and dumping of waste residues and liquids, and the leakage of production processes, a large amount of organic pollutants are discharged into the environment, and finally accumulate in the soil environment, resulting in serious soil organic pollution. . The main organic pollutants in the soil are pesticides, chloral, polychlorinated biphenyls (PCBs), polycyclic aromatic hydrocarbons (PAHs), petroleum, methane, etc. Thermal desorption technology is recognized as a mature and reliable restoration technology for organic contaminated soil. Thermal desorption...

AI Technical Summary

Problems solved by technology

This tail gas incineration method is only to pass the organic waste gas through the cyclone dust collector for dust removal, and then pass it into the combustion chamber of the flue gas incinerator for secondary combustion until the discharge reaches the standard. Although the final tail gas can be discharged up to the standard, the incineration process significantly increases energy consumption. , greatly increasing the cost of

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