Biodegradation and purification system for VOCs produced during spraying of water-based paint

Abstract

The invention relates to the technical field of manufacturing of coating construction equipment, and discloses a biodegradation and purification system for VOCs produced during spraying of water-based paint. The biodegradation and purification system comprises an aerobic biochemical pool, a plurality of water spraying biodegradation adsorption towers and clean water tanks positioned between the aerobic biochemical pool and the water spraying biodegradation adsorption towers, wherein an upper spraying area and a lower spraying area are sequentially arranged in each water spraying biodegradation adsorption tower from top to bottom, the inner bottom end of the aerobic biochemical pool is arranged to be a conical body, and an MBR membrane group is arranged on one side of the inner upper end of the aerobic biochemical pool. According to the invention, through repeated biochemical treatment and water dissolution, an organic solvent in the air is cleaned up to obtain clean air, and the clean air is discharged outdoors from the top end of the water spraying biodegradation adsorption towers without combustion treatment, so emission of CO2 generated after combustion is avoided, and energy consumption is greatly reduced; and the whole process is free of ignition, so a fire-fighting potential safety hazard is avoided, equipment manufacturing cost is reduced, and treatment effect is greatly improved.

Description

technical field [0001] The invention relates to the technical field of coating construction equipment manufacturing, in particular to a water-based paint spraying VOC biodegradation purification system. Background technique [0002] At present, in the coating industry, a large number of water-based paint coating materials are used. The organic solvent components contained in water-based paint are mainly water-soluble substances such as alcohols and ethers; the paint mist and volatilized solvent gas generated during the spraying process can be Soluble in water, absorbed by water, and easily degraded and eliminated through biochemical reactions, while the main component of the solvent in the coating material is water, so the air pollution is greatly reduced, but there are still a small amount of VOC (volatile organic compounds) Released into the atmosphere, polluting the air, therefore, the discharged gas needs to be treated. [0003] The traditional VOC treatment method is a...

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Problems solved by technology

[0002] At present, in the coating industry, a large number of water-based paint coating materials are used. The organic solvent components contained in water-based paint are mainly water-soluble substances such as alcohols and ethers; the paint mist and volatilized solvent gas generated during the spraying process can be Soluble in water, absorbed by water, and easily degraded and eliminated through biochemical reactions, while the main component of the solvent in the coating material is water, so the air pollution is greatly reduced, but there are still a small amount of VOC (volatile organic compounds) Released into the atmosphere, polluting the air, therefore, the discharged gas needs to be treated

[0003] The traditional VOC treatment method is as follows: the spraying air contains organic solvents, and after being filtered by the filter bag, it enters the zeolite rotor for adsorption and concentration of organic solvents, and the air filtered out of organic solvents is directly discharged into the atmosphere; the organic solvent adsorbed on the zeolite wheel is subjected to high temperature The gas is heated and desorbed and enters the incinerator. Under the action of natural gas auxiliary combustion, it is subjected to high-temperature incineration treatment. The high-temperature air after incineration enters the heat exchanger and is discharged into the atmosphere. After the heat exchanger heats a part of the air, it is used as a heating zeolite organic solvent The desorbed high-temperature gas enters the zeolite runner; however, the adsorption effect of this method is not good, and VOC air pollution still exists. After activated carbon absorbs VOC, regeneration is difficult, causing secondary pollution

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