Ozone Generator Output Is Low in a Bottled-Water Plant

Separate ozone generation from mass transfer and ozone demand. Check feed-gas dryness and purity, generator cooling and power, gas flow, injector or diffuser performance, contact time, off-gas and water quality.

Use the plant chemical-handling procedure, suitable PPE and lockout/tagout. Depressurize housings and verify that cleaning chemicals have been displaced before opening a pump, filter or membrane vessel.

Locate the fault

• Generator display is normal but dissolved residual is low
• Output falls during humid weather
• Injector vacuum or gas flow changes
• Residual disappears rapidly in the contact tank

Inspection sequence

1. Apply ozone exposure and off-gas safety controls before testing
2. Measure gas-phase output and gas flow with approved instruments where available
3. Verify feed-gas pressure, purity and pressure dew point
4. Check cooling-water or air conditions and generator alarms
5. Inspect injector vacuum, diffuser condition and contact-tank hydraulics
6. Sample ozone demand through the system and compare with current water quality

Corrective work

• Restore dry clean feed gas and service the oxygen or air preparation system
• Correct generator cooling, power or cell condition through qualified service
• Clean or repair the injector, diffuser and gas path
• Address upstream contaminants and restore validated contact time

Operating records and follow-up

• Trend feed-gas dew point and generator output
• Maintain cooling and gas filters
• Inspect mass-transfer equipment
• Track raw-water ozone demand
• Calibrate residual analyzers and test safety interlocks

Equipment details: Water Treatment System.