Packaging and printing workshop mainly produces all kinds of plastic film printing products. In the production process, a large number of color inks or organic diluents will be used. Printing ink and waste gas include benzene, toluene, xylene and ethyl acetate. If these VOC organic waste gases are directly discharged without treatment, it will affect the surrounding environment and people nearby.
The waste gas of printing workshop needs to be collected first, and then introduced into the waste gas treatment equipment for treatment. There are many kinds of waste gas treatment equipment in printing workshop, such as catalytic combustion, activated carbon adsorption, photo oxidation waste gas purification, plasma purification and biological purification. Printing is generally divided into: screen printing, gravure printing, relief printing, plate making printing, etc.
The air pollutants produced by printing are mainly the ink exhaust gas produced in the printing process and the gas volatilized by gasoline used to clean the ink. Solvent based ink (containing 50% - 60% volatile components) and diluent, the proportion of volatile components is 70% - 80%. The components of VOCs are benzene, toluene, xylene, acetone, butanone, lipid, ether and aerosol.
Application of photooxidation equipment in waste gas treatment of printing workshop
The waste gas of printing workshop is mostly organic waste gas with large volume and low concentration. In view of the evergreen environmental protection of this kind of waste gas, it is suggested to collect the waste gas first, and then introduce it into the UV photo oxidation waste gas purification equipment. High ozone ultraviolet beam decomposes oxygen molecules in the air and produces free oxygen, namely active oxygen.
Because the positive and negative electrons carried by free oxygen are unbalanced, it is necessary to separate them from the oxygen that produces ozone. After that, the ozonator generates enough oxygen ions to oxidize the waste gas to produce carbon dioxide and water, which are then discharged through a 15 meter chimney.
For the above waste gas treatment process of printing workshop, only one of them is described. You need to develop solutions based on your printing equipment, solvent and ink composition.
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