Resource tail gas treatment system and technology for soil vapor extraction repair technique

Abstract

The invention relates to a resource tail gas treatment system and a technology for a soil vapor extraction repair technique. First, tail gas enters a gas-liquid separation tank. The back of the separation tank is connected with a vacuum pump. The tail gas enters a solvent absorption tower from the output end of the vacuum pump. Gas from which pollutants are removed is exhausted to atmosphere from the top of the absorption tower. Solvent by which the pollutants are absorbed is discharged from the bottom of the absorption tower and enters a solvent regeneration tower. The pollutants are discharged from the top of the solvent regeneration tower and enter a pollutant recovery tank after the pollutants are cooled by a condenser. The solvent is delivered by the vacuum pump from the bottom of the regeneration tower to the absorption tower for recycling after the solvent is cooled by the condenser. If high-selectivity absorbent is used under proper operating conditions, the absorption rate of volatile or semi-volatile organic pollutants in the tail gas can reach 99.99 percent, the content of organic pollutants in air can fully satisfy the national pollutant discharge standard and the trouble in tail gas treatment related to SVE oil repair is solved. Organic matters are resourced and recovered, the solvent is recycled and the regeneration rate can reach 99.999 percent above.

Description

technical field [0001] The invention relates to the technical field of soil remediation, in particular to a gas phase extraction and remediation technology (SVE) recyclable tail gas treatment system and process. Background technique [0002] Soil vapor extraction (Soil Vapor Extraction, SVE), an emerging soil in situ remediation technology. Because of its effectiveness and extensiveness in the treatment of petroleum-contaminated soil and groundwater, it is gradually developing into a standard environmental restoration technology. It is listed as a "revolutionary technology" by the US Environmental Protection Agency (EPA) and vigorously advocates its application. [0003] Soil Vapor Extraction (SVE) is a common method for physically removing volatile organic compounds (VOCs) and petroleum hydrocarbons from seepage or unsaturated areas (i.e., the area between the surface and the water layer). Organic compounds slowly seep into the area from infiltration points or other sourc...

AI Technical Summary

Problems solved by technology

Among them, the adsorption process mostly uses activated carbon adsorption technology, but due to its limited adsorption capacity, it is only used for tail gas treatment with low pollutant concentration, and the activated carbon after adsorbing pollutants must be regenerated or post-treated

Heat treatment technology includes on-line combustion and thermal oxidation (such as catalytic oxidation) technology. Its advantage is that the tail gas is completely oxidized and decomposed without subsequent treatment or disposal. It can be used for tail gas treatment with high pollutant concentration, but the cost of heat treatment is high. Electric power Increased control costs, and may increase greenhouse gas emissions, resulting in secondary pollution

Neither of these two technologies has achieved recovery and recycling of pollutants, or there are environmental risks

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