Wastewater treatment system for powder coating process

Abstract

The invention relates to the technical field of powder coating, in particular to a wastewater treatment system for a powder coating process. The system comprises an air floatation and sedimentation integrated tank, wherein the air floatation and sedimentation integrated tank comprises a tank body and a column body with a sealing plate; the column body comprises an outer shell cylinder and an innershell cylinder, air holes are formed in the cylinder wall of the inner shell cylinder, an air inlet is formed in a bottom plate of the tank body, an air cavity is provided with a mounting ring and aconnecting shaft, the outer ring surface of the mounting ring is connected with the inner wall of the inner shell cylinder through a plurality of single rods, the connecting shaft is connected with the inner ring surface of the mounting ring through a rotating bearing, one end, close to of the air inlet, of the connecting shaft is provided with fan blades, and the other end of the connecting shaftpenetrates through the sealing plate and is provided with an air floatation scraper; a fluidization plate is arranged between the outer shell cylinder and the inner shell cylinder so as to divide a cavity between the outer shell cylinder and the inner shell cylinder into a medicine cavity and an electrostatic cavity, the medicine cavity is loaded with medicine powder, and the electrostatic cavityis provided with an electrostatic generator; and a plurality of through holes are formed in the wall of the outer shell cylinder and are covered with first one-way plates. The system has the characteristics of being rapid in flocculation and complete in reaction.

Description

technical field [0001] The invention relates to the technical field of powder coating, in particular to a wastewater treatment system for powder coating process. Background technique [0002] Powder spraying is to use powder spraying equipment to spray powder coating on the surface of the workpiece. Under the action of static electricity, the powder will be evenly adsorbed on the surface of the workpiece to form a powdery coating; The final coating with different effects (different types of powder coating effects); the spraying effect of powder spraying is better than that of spray painting in terms of mechanical strength, adhesion, corrosion resistance, aging resistance, etc., and the cost is also lower than that of spray paint with the same effect . [0003] The wastewater generated in the coating process is mainly divided into pretreatment wastewater, electrophoresis wastewater and painting wastewater. The patent document whose publication number is CN205933486U disclos...

AI Technical Summary

Problems solved by technology

In this application, the air flotation tank and the combined sedimentation tank are used separately, which increases the operation steps and the operation cost is high

At the same time, the principle of using the traditional air flotation tank is: firstly connect the aerator and the driving motor to the external power supply, then transport the waste water to the interior of the aeration chamber through the water inlet pipe, and then turn on the aerator to generate a large amount of micro Bubbles, micro-bubbles and wastewater are fully mixed and enter the reaction chamber through the drainage hole, and then the coagulant is added to the reaction chamber through the slag scraping operation port, so that the coagulant and the impurities in the waste water undergo flocculation reaction, and the resulting flocculation The suspended solids contained in the waste water and the waste water rise and float on the surface of the liquid through a large number of microbubbles, and then turn on the drive motor to drive the slag scraper to scrape off the flocs and suspended solids floating on the liquid surface, and pass through the sewage plate and the sewage outlet, and finally the remaining water can be discharged through the drain outlet; in the use of the existing air flotation tank, it is found that the transmission chain of the slag scraper is often loose during the use of the slag scraper, which affects the slag scraper operation of the slag scraper, resulting in its The use reliability is low; the coagulant added at the same time cannot fully mix and react with the waste water, resulting in incomplete flocculation of the waste water and high use limitations

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