Treatment of pollutants in coating production line
We all know that during the operation of the coating production line, various pollutions will be generated. These pollutions mainly include waste water, waste residue, exhaust gas and noise. Next I will briefly introduce the sources and treatment of these pollutants.
1. Wastewater treatment of coating production line
The wastewater mainly comes from degreasing, phosphating, passivating wastewater generated during pre-coating treatment, and wastewater containing electrophoretic paint generated by cathodic electrophoresis. Wastewater from the spray booth and cleaning of waterborne mid-coat paint, and the waste water discharged regularly from the circulating water of the topcoat spray booth. Generally all wastewater will be collected in the basement and treated separately according to the type of sewage. Neutralize, deposit, filter, and discharge acid-base wastewater; use electrolytic and chemical reduction methods for wastewater containing hexavalent chromium (Cr6-); and treat spray booth wastewater, whether it is water-based paint or solvent-based paint Wastewater is treated by adding paint mist coagulant, and the paint slag is automatically discharged. The treated wastewater is continuously recycled, and the paint slag is burned or treated with other industrial waste.
2. Waste treatment of coating production line
Waste slag is mainly lacquer slag, and the sediment generated from the treatment of wastewater. Generally, it can be dehydrated with a plate and frame filter press and transported to a special waste slag storage place.
3. Waste gas treatment of coating production line
The exhaust gas mainly comes from the exhaust gas from the pretreatment, paint spraying room, leveling room, and boring furnace. The pollutants emitted are generally as follows: organic solvents that can form photochemical smog, volatile paint that emits malodor, thermal decomposition products and Reaction products, acid-base mist, dust generated during shot blasting, and dust in paint mist. The use of coatings that do not contain organic solvents or low organic solvent content is the most useful way to solve organic solvent pollution. Minimize the amount of organic solvents, reduce the amount of organic solvent waste gas treatment, and collect and treat the waste gas containing high concentration of organic solvent. It is discharged to the atmosphere after the dilution is adopted. For the high-concentration, small-air-volume organic solvent waste gas discharged from the boring curing furnace in the production line, the incineration method, catalytic incineration method, and adsorption method are generally used for treatment.
4. Noise treatment of coating production line
The noise source mainly comes from fans and transportation devices. Therefore, it is necessary to select fans and transportation devices that meet the noise requirements in the production line. It is best to set up sound-absorbing materials inside the painting workshop. The control system of the coating production line has been continuously improved with the development of the age, and requires the control system to be more and more reliable. Therefore, the electrical control of the coating production line is generally double control, which can be controlled by each electrical cabinet, and can also be controlled by the central room. The central control room and the drying tunnel are generally equipped with microcomputers, which can accurately control the temperature of the various areas of the dry curing furnace The control room can be equipped with a TV monitor to display and record the temperature curve of the rise and fall, and can also set and modify parameters at any time in order to adjust the temperature according to the size of various workpieces and different coating colors. The bath can be controlled by a thermocouple. All motors on the coating production line are generally equipped with two levels of maintenance and are interlocked with the main control. Any motor appears to be faulty, and the sub-control cabinet and central control room can alarm. If the equipment is faulty, the entire line can be automatically shut down. Ensure safe operation.
The above is the related content of "polluting treatment of coating production line". The information is provided by Guangdong Chuangzhi, a 25-year-old coating production line manufacturer.