PURPOSE: To keep catalytic treatment capacity over a long period of time by arranging a pretreatment tower on the upstream side of a catalyst tower to pack the same with an adsorbent adsorbing the component bonded to a catalyst and washing the same with hot water when a definite amount of the adsorbed and bonded component on the catalyst is accumulated.
CONSTITUTION: Exhaust ozone gas enters a collector 4 from piping 5 and, after a part of the waterdrops in the exhaust ozone gas is collected, said gas passes through a pretreatment tower 9 from piping 3 through a solenoid valve 10. At this time, the component bonded to a catalyst is adsorbed by the adsorbent 8 received in the pretreatment tower 9 and, thereafter, the exhaust ozone gas enters a catalyst tower 2 through a solenoid valve 7 and the ozone gas is separated by the catalyst 1 in the tower 2. When treatment is performed for a definite time, the component bonded to the catalyst is accumulated on the adsorbent 8 and, therefore, the solenoid valves 7, 10 are closed at every definite time and a solenoid valve 14 is opened to supply the hot water heated by a heater 11 to the pretreatment tower 9 by a pump 13. The adsorbed substance is dissolved and separated from the adsorbent 8 and, thereafter, a solenoid valve 15 is opened to drain the dissolved and separated substance. After the washing of the adsorbent is completed, the regular treatment of exhaust gas is again performed.
ISHIKAWA KATSUHIRO
TAGUCHI KENJI
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