Chemical Oxygen Demand
Considerable COD removal is registered at increased ozone dosage according to the linear
relationships seen in Figure 17. Inlet COD of 256, 422, 243 mg/L requires 0.2 g O3/L to reduce the
COD to 151, 290 and 112 mg/L respectively. All mills are showing the same trend with curves of
similar slope; see Equation 3 for derived COD equation as a function of the ozone dosage.