Abstract
The purpose of this paper is to examine countermeasures for exhaust prevention of organic solvents at a given print shop in preparation for its reconstruction.
First, the composition and concentration of exhaust gaseous organic solvents and the woking environment of the print shop were investigated. The composition of the organic solvents was ethyl acetate, isopropyl alcohol and toluene. The total concentration of the exhaust gas was 448 ppm, which is over the Tokyo Metropolitan standard regulation value (total concentration of the three components should be 200 ppm or less). The maximum total concentration in the working environment was 762 ppm.
A bench-scale removal experiment with activated carbon adsorptive deodorization apparatus was conducted on the actual exhaust gas of the print shop by using two kinds of activated carbon.
The breakthrough time was defined as the time when the total concentration in the outlet gas of the deodrization apparatus came to 10 ppm. The breakthrough time for the granular activated carbon was 38 hr for a bed height of 260 mm and a contact time of 1.3 sec, while that for the pelletized activated carbon was 29 hr for a bed height of 330 mm and a contact time of 1.65 sec.
