Name

Novel Ozone injection technique to mitigate Bromate formation, optimize process control and minimize capital expenditures

Speakers

Rudy Lamond

Authors

Izba Ali, Air Liquide, France
Jan Mante, Air Liquide, Germany
Rudy Lamond and Roel Boussemaere, Air Liquide, Belgium
Tomas Alexandersson, Air Liquide, Sweden

Description

This study presents a new ozone injection method called ozone strong water (OSW) for water treatment that increases efficiency and reduces bromate formation by separating ozone injection and mass transfer from the reaction. A side stream from the main water flow is pumped into a tank and flows against ozone gas. Pressure is increased to optimize ozone transfer. Dissolved ozone is stabilized by reducing pH with carbon dioxide, which also prevents bromate formation. This innovative system yields gas-free water with a high ozone concentration (up to 300 g/m³) and pressurized off-gas (O₂) suitable for reuse in aerated sections of the wastewater treatment plant. The ozonated water can then be readily mixed into the main water stream. This novel approach offers several advantages over traditional systems, including need-based ozone dosing, elimination of gas injection in the reactor, and greater flexibility in reactor design. Full-scale trials conducted at a municipal treatment plant in Germany demonstrated the efficacy of this new method. 

Preliminary results indicate a 25% reduction in ozone requirements for achieving over 80% micropollutant removal, with no bromate formation observed even at bromide concentrations up to 120 µg/L.

Time

3:50 PM - 4:02 PM

Location Name

Room 3

Track

10:05 - 16:15 Micropollutants & Emerging Contaminants