The emission from the reactor flowed into two wash bottles,
which were placed in series and contained 1000 and 500 mL
potassium iodide (KI) solution, respectively, to trap unconsumed
ozone from the column. A port was mounted to the first wash bottle
considering sampling from the KI solution and analyzing the
amount of ozone consumed in the column. The second one guaranteed
complete capture of ozone from the outlet gas before released
to the environment.