Ozone Equations: Concentration and Dosage

ADJUST FLOW RATE CONVERSION – DETERMINING OZONE DOSAGE IN WATER: Water Flow Rate x Ozone Dosage = Required Ozone Production UNITS CONSISTENCY IS VERY IMPORTANT: Below is the formula for determining ozone generation requirements if you know the common water and ozone parameters (namely flow rate in GPM and ozone dosage in mg/l). Flow rate (gpm) x 3.75 l/gal x 60 min/hr. x ozone dosage (mg/l) = ozone production (mg/hr.) Let’s work through an example: How much ozone production is needed to dose 2 ppm into 20 GPM of water? (We will be using ppm throughout the rest of this example knowing that 1 mg/l = 1 ppm) 20 GPM x 3.75 l/gal x 60 min/hr. x 2 ppm = 9084 mg/hr. ( gm/hr.) Remember that 9 mg/hr. will permit you to dose the water with 2 ppm of ozone. This does not mean that 2 ppm will be your final dissolved ozone concentration. Due to efficiency losses with injecting ozone and ozone demand of the water, your dissolved ozone concentration will be less. – DETERMINE THE OUTPUT OF AN OZONE GENERATOR: Flow rate (lpm) x ozone concentration (g/m3) = ozone production (mg/hr.) Let’s work through an example: The ozone concentration exiting an ozone generator is 120 g/m3 at 5 l/min of oxygen flow. What is the output? 5 l/min x 120 g/m3 x (1 m3/1000 l) = 0.60 g/min g/min are not normal units in the ozone industry so we simply convert minutes to hours to get g/hr.: 0.60 g/min x 60 min/hr. = 36 g/hr. SAMPLE CONVERSIONS: Convert 140 g/m3 / 100 g/m3 x 6.99 wt. % = 9.8 wt. % Source: Ozone Solutions

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