Treatment method and treatment device for water-based waste solvent

Abstract

The invention relates to a water-based waste solvent treatment method and a treatment device thereof.The treatment method comprises the steps that a water-based waste solvent is conveyed into a coagulation reaction device, a proper amount of coagulant is conveyed into the coagulation reaction device, and after the water-based waste solvent is stirred and completely reacts, the coagulant is added into the coagulation reaction device; conveying the supernatant into a reduced pressure distillation device; after the reduced pressure distillation of the supernatant liquid and the filtrate is completed, conveying a distilled thin liquid into a pervaporation device; after pervaporation of the distilled thin liquid is completed, the pervaporation thin liquid is conveyed to a wastewater treatment workshop section. The invention provides a water-based waste solvent treatment method and a water-based waste solvent treatment device, which can greatly reduce the problem of membrane pollution, prolong the service life of a membrane, reduce the cost of membrane replacement and ensure the stable operation of a pervaporation membrane unit.

Description

technical field [0001] The invention relates to the technical field of industrial wastewater treatment, in particular to a treatment method and a treatment device for an aqueous waste solvent. Background technique [0002] In recent years, with the rapid development of automobile demand, the production lines of many automobile manufacturers are constantly expanding, which has also resulted in a large amount of waste water in automobile painting workshops, including the use of water-based solvents to clean spray guns and pipelines for conveying paint. Aqueous waste solvent produced during The water-based waste solvent mainly contains complex components such as paint, organic solvent, surfactant and curing agent, and the CODcr content is about 300,000 to 800,000 mg / L. At present, according to feedback from major painting workshops, this water-based waste solvent is basically entrusted to qualified companies for incineration treatment as hazardous waste, and the treatment cost...

AI Technical Summary

Problems solved by technology

At present, the existing biochemical methods, low-temperature evaporation technology, advanced oxidation technology, reverse osmosis membrane method and other treatment methods have problems such as too high organic load, azeotropic water and organic matter, unstable operation and high cost, and membrane material life. Engineering application cannot be realized due to various problems

The pervaporation membrane technology that has appeared in recent years can realize the engineering application of the reduction and resource utilization of the aqueous waste solvent, but in the process of practical application, the membrane separation performance decays too fast, resulting in frequent membrane replacement, which greatly Increased operating costs

This is because the curing agent and resin in the water-based waste solvent cannot be completely removed by coagulation and precipitation, and will be precipitated and deposited on the membrane surface after heating, which has a relatively large negative impact on the separation performance and service life of the pervaporation membrane.

[0004] Aiming at the above-mentioned existing pervaporation technology for treating the water-based waste solvent of automobile painting, the residual curing agent and resin after the coagulation of wastewater affect the separation performance and service life of the membrane, etc., the present invention provides a water-based waste solvent for automobile painting The treatment method and its treatment device greatly reduce the problem of membrane fouling, prolong the life of the membrane, reduce the cost of membrane replacement, and ensure the stable operation of the pervaporation membrane unit

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