Low Bromate Formation with Ozonation

by Hans Holtz

Ozone level at setpoint

LOW BROMATE FORMATION IN BOTTLED WATER

Novozone recently supplied, installed and commissioned a State of the Art Wassertec Ozone Disinfecting System for an important bottled water manufacturer. The mineral water is drawn from a deep aquifer and is of superb quality but it contains some bromide.

Ozone reacts with the bromide and converts some into bromate which is classified as a carcinogen and is subject to a MAV of 0.010 ppm in New Zealand.

The original bottling plant had seen a few changes over the years and management decided to modernise and fully automate the plant. This included the replacement of the old ozone "pencil" contactor (ozone is "bubbled in" with a diffuser in this sytem) with an in-line venturi based ozone system.

In order to minimise the bromate formation the ozone level had to be accurately controlled at a very low level at varying bottling rates. We normally like a dissolved ozone level of up to 0.5ppm but in this case we wanted 0.06ppm.

ACCURATE DISSOLVED OZONE CONTROL

This screen shows accurate dissolved ozone control from startup to 0.06ppm (set point). At this level the bromate formation was well below MAV.

HIGH QUALITY OZONATION EQUIPMENT

These excellent results are due to the quality of the Wassertec equipment and its control system. This picture captures the two main components of the ozone system: The BB40 ozone panel with its large HMI screen and the ozone injection and contacting system.

The Ozone Panel features:

  • Built-in oxygen concentrators
  • Redundant ozone generators
  • Large HMI screen, very user friendly interface and system status mesasaging
  • Internet connectivity to the main bottling PLC enabling on-line support from Wassertec in South Africa
  • Large tower light showing the status of the ozone system from acrosss the plant floor

The Ozone Mixing and Contact Tank features:

  • Booster pump with venturi injector
  • Dissolved ozone probe and flow cell
  • Temperature probe
  • Ozone Off-gassing

Contact us now for our assistance to implement ozonation in your bottling process.

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