Wastewater treatment system for acrylic acid industry

Abstract

The invention belongs to the field of wastewater treatment, and discloses a wastewater treatment system for the acrylic acid industry. The system comprises a water collecting tank, an electrocatalysis oxidation device, an integrated regulating tank, a UASB(Upflow Anaerobic Sludge Blanket) reactor, a contact oxidation tank and a secondary sedimentation tank, wherein the water outlet of the water collecting tank is connected with the water inlet of the electrocatalysis oxidation device, the water outlet of the electrocatalysis oxidation device is connected with the water inlet of the integrated regulating tank, the water outlet of the integrated regulating tank is connected with the water inlet of the UASB reactor, the water outlet of the UASB reactor is connected with the water inlet of the contact oxidation tank, the water outlet of the contact oxidation tank is connected with the water inlet of the secondary sedimentation tank, and the water outlet of the secondary sedimentation tank is connected with a blow-off pipeline. According to the invention, the existing wastewater treatment device is optimally recombined, the equipment is simple, the treatment capacity is big, the treatment efficiency is 2-3 times of that of the existing acrylic wastewater recycling process, the cost of investment is low, and the operating cost for treating 1 ton wastewater is only 5 yuan, which is 1 / 2 of that of the existing acrylic wastewater recycling process.

Description

technical field [0001] The invention belongs to the field of wastewater treatment and relates to a wastewater treatment system for the acrylic acid industry. Background technique [0002] Acrylic acid and its esters are an important class of chemical raw materials. They can be homopolymerized by themselves or copolymerized with other vinyl monomers, such as styrene, vinyl acetate, methyl methacrylate, acrylonitrile, vinyl chloride, etc., to make various Acrylic resins or polyacrylates with different properties constitute a series of acrylic acid chemical products. These products are widely used in textile, chemical fiber, paint, leather, oil exploration, adhesives, building materials, water treatment and other industries. In recent years, acrylic acid (ester) has been highly valued by the chemical industry and has developed rapidly. However, a large amount of wastewater is produced at the same time. Wastewater contains acetic acid, methacrylic acid, acrylic acid, formaldehy...

AI Technical Summary

Problems solved by technology

Because the wastewater contains substances that are toxic to microorganisms and lacks nutrients, biochemical methods are directly used to treat this type of wastewater, especially for high-concentration acrylic acid wastewater; and catalytic wet oxidation cannot completely degrade acrylic acid production wastewater. In addition, there are problems of catalyst failure and secondary pollution, and the reacted water still needs further treatment, which increases the treatment cost; the incineration method has problems such as high cost and large one-time investment, and it is difficult to promote industrialization

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