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Treatment Methods of Waste from Painting Production Line

Treatment Methods of Waste from Painting Production Line

The pollution of the painting production line generally includes waste gas, waste water, waste residue and noise. At present, the waste gas from the painting production line mainly comes from the exhaust gas from the pre-treatment, painting room, leveling room, and drying furnace. The pollutants are roughly as follows: organic solvent which can form photochemical smog, foul-smelling paint volatiles, products of thermal decomposition and reaction products, acid-base mist, dust generated during painting and dust in paint mist.


1. The treatment of organic solvent pollution in painting production line


Using paints that do not contain organic solvents or have low content of organic solvent is the most effective way to dispose of organic solvent pollution. Minimize the amount of organic solvents, reduce the amount of organic solvent waste gas that needs to be dealt with, and centrally treat waste gas containing high-concentration organic solvents. After dilution, it is discharged into the atmosphere; the high-concentration, low-volume organic solvent waste gas discharged from the drying and curing furnace in the painting production line is usually treated by the combustion method, the catalytic combustion method, and the adsorption method.


2. The treatment of waste water in painting production line


The waste water mainly comes from the degreasing, phosphating, passivation waste water produced by the pretreatment of paint production equipment, and the waste water containing electrophoretic paint produced by cathodic electrophoresis as well as waste water from the spray booth and cleaning of the water-based intermediate paint, and the waste water from the recycle water of the spray booth of finish paint. Generally, all waste water is concentrated in the basement and treated separately according to the type of waste water.


3. The treatment of paint mist coagulant in painting production line


Paint mist coagulants are mostly composed of cationic polymers of medium molecular weight, which have extremely high electric charges and can have a strong attraction to paint droplets. When the paint droplets are "captured" and absorbed, it uses the affinity of different polarities to completely wrap and penetrate the paint droplets, destroy the functional group of the paint of the paint production equipment, make it completely eliminate the viscosity, and drive the wrapped paint droplets to float. Paint mist coagulants are mostly composed of polymers with a molecular weight of tens of millions. Through the "bridge" between molecules, the damaged paint mist and impurities are gathered into larger groups to make them firm and adherent, so as to enhance the efficiency of mechanical dehydration.


4. The treatment of noise in painting production line


The noise mainly comes from fans and transportation devices. Therefore, we must select fans and transportation devices that meet the noise requirements on the painting production line. It is best to install sound-absorbing materials inside the workshop of paint production equipment. The control system of the painting production line has been continuously improved with the development of the times, and the control system is required to be more and more reliable. Therefore, the electrical control of the painting production line is generally compound control, which can be controlled by each electrical cabinet or the central room. The central control room and the drying tunnel are generally equipped with microcomputers, which can accurately control the temperature of each zone of the drying and curing furnace. The control room can be equipped with a TV monitor to display and record the rise and fall curves of temperature, and can also set and modify parameters at any time, so as to adjust the temperature according to the size of various workpieces and the different paint colors.

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