Paint wastewater treatment system

Abstract

The present invention provides a paint wastewater treatment system with characteristics of low investment and low running cost. The paint wastewater treatment system comprises a sewage tank, a flocculation pipeline, a first water pump, a second water pump, an agent addition device, a magnetic separation device and a clear water tank, wherein a water inlet pipe of the magnetic separation device is communicated with the sewage tank through the flocculation pipeline and the first water pump, a water outlet pipe of the magnetic separation device is communicated with the clear water tank through the second water pump, the agent addition device is communicated with the flocculation pipeline, and is sequentially provided with a sodium hydroxide addition device, a polyaluminum chloride addition device, a polyacrylamide addition device and a PF iron powder flocculant addition device along a wastewater flow direction, the magnetic separation device comprises a mud water separation tank provided with a water inlet pipe and a water outlet pipe, a magnetic rotation disc arranged inside the mud water separation tank through a rotation shaft, a mud scraping plate and a residue cleaning region, the rotation shaft is connected with a power device through a speed reducer, and the mud scraping plate is fixed between the residue cleaning region and the magnetic rotation disc, and contacts the magnetic rotation disc.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a paint wastewater treatment system. Background technique [0002] No matter what kind of spraying method is used in the painting process, it is impossible to make the paint mist completely adhere to the surface of the coated workpiece, and a part of overspray paint mist will always be generated. Reducing the discharge of organic solvents, protecting the environment, saving energy and resources, reducing costs, and ensuring the quality of spraying are the directions that the painting industry is constantly pursuing, and efforts to improve the recovery rate of overspray paint are currently a bottleneck in the painting industry. Increased overspray recovery rate means reduced paint consumption costs, improved working conditions for operators, and benefits for fire protection and labor safety. At the same time, it reduces the cleaning frequency of the paint...

AI Technical Summary

Problems solved by technology

Precipitation in the circulating water pipeline and the bottom of the tank reduces the purification efficiency of the circulating water and increases the number of replacements of the circulating water, and it takes a lot of manpower and time to remove these paint residue accumulations

Traditional paint wastewater treatment methods include the following: 1. Using biochemical treatment, adding a certain dose of chemical agents to the wastewater, passing through the water collection adjustment tank-grid-neutralization coagulation-air flotation-hydrolysis acidification adjustment-oxidation ditch -Secondary settling tank-biological aerated filter-effluent and a series of processes for treatment, this treatment method covers a large area and investment cost, high operation and management costs, there are problems in the initial investment of general small and medium-sized enterprises

2. Use filters, settling tanks, and filter press methods to treat paint wastewater. In this treatment method, highly viscous substances and wastewater are easy to block components, and replacement components and operating costs are high, and reliability is low.

3. Use traditional paint flocculants to destick and suspend paint slag, then salvage them on the artificial water surface or use a slag scraper to salvage them. This treatment method is not thorough enough to remove the slag from the bottom of the pool, and it is easy to cause water curtains. The clogging of the cabinet circulation pump affects the spray effect, and the paint mist is easily discharged from the exhaust port to cause secondary pollution. It is difficult to meet environmental protection standards and the operating cost is high.

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