The transferred ozone dose (TOD) was used as a descriptive parameter throughout the study.
It is defined as follows:
TOD = Qgas / Qliq ([O3]g in - [O3]g out ) (eq. 1)
where: Qgas and Qliq are gas and water flow rates respectively,
[O3]g in is the ozone concentration in the feed gas to the column,
[O3]g out is the ozone concentration in the off-gas leaving the column