Ozone (O3) is a strong oxidizer used for drinking water, wastewater and industrial disinfection. Istanbul ISKI Ikitelli and Ankara ASKI Tatlar plants run ozonation units. O3 is toxic (0.1 ppm TLV); corona discharge uses high-voltage + PSA oxygen. NFPA 91 requires exhaust capacity and NFPA 70 Class I Div 2 wiring for the generator room.
Ozone Properties
- Formula: O3, 48 g/mol
- TLV-TWA: 0.1 ppm
- IDLH: 5 ppm
- Odor threshold: 0.01 ppm
- Half life: 20 min in air
Generator Technology
- Corona discharge: 8-20 kV AC
- PSA O2: 90 percent purity
- Cooling water: 20-25 C
- Output: 10-100 kg O3/h large plant
- Energy: 8-15 kWh/kg O3
NFPA 91 Ventilation
- Generator room: 30 ACH min
- Emergency: 100 ACH leak
- Duct material: PVC, PVDF, 316 SS
- Ozone destruct: Catalytic or thermal
- Monitor: 0.1 ppm alarm
Electrical Classification
- Ozone room: Oxidizing environment
- Hydrogen risk: PSA electrolysis
- Class I Div 2: PSA O2 leak
- Grounding: HV RF
- Interlock: Exhaust fail -> stop
Turkey Uses
- ISKI Ikitelli: 420,000 m3/day ozonation
- ASKI Tatlar: 400,000 m3/day
- IZSU Cigli: Izmir wastewater
- Textile: Reactive dye decolor
- Food: Vegetable CIP disinfection
Ozone with MEP Calc
MEP Calc sizes ozone rooms 30 ACH, emergency 100 ACH, PSA oxygen 90 percent, corona 20 kV and NFPA 91 destruct unit.
Download MEP Calc on the App Store
Sources & Further Reading
NFPA 91, NFPA 70, OSHA 1910.1000, USEPA ozone, ASTM D5111. NFPA 91 Exhaust Systems.