Virtual Meeting
Date: 22 April 2026Time: 11:00am_____________________________________________________________________________________________Attendees:Ralph Ogden - ACT Healthy Waterways
Hamid Moayed - NBT
Mary Vojdani - NBT
Otto Wurth - NBT
_____________________________________________________________________________________________Websites:
nanobubble.com.aunano100nm.com
nanobubblelibrary.com
Lake Tuggeranong District Park
Healthy waterways program
_____________________________________________________________________________________________
Issues
The problem
Blue-Green Algae (Cyanobacterial Blooms)
• Unpleasant smells and unsightly green/scummy water.• Health risks to people, pets, and wildlife (toxins can cause skin irritation, illness if swallowed, or
worse in high concentrations). There have been dog deaths linked to similar blooms in nearby lakes.• Frequent closures of swimming beaches and recreational areas (sometimes for weeks or more).
Primary contact (swimming) is often banned, and even secondary contact (boating) can be affected.• Potential aerosolised toxins on windy days affecting nearby residents.
Potential Solution Nanobubble Technology (Oxygen or Ozone-based)
Nanobubbles deliver sustained dissolved oxygen directly to the sediment-water interface, where traditional aeration often falls short. This raises oxidation-reduction potential, oxidises organic matter, promotes beneficial aerobic bacteria, and significantly reduces the release of bioavailable phosphorus from sediments (internal loading).
Benefits observed in similar eutrophic lakes include:
• Reduced phosphorus recycling (often 60–75% in targeted zones) • Lower chlorophyll-a, improved water clarity, and suppressed cyanobacterial blooms • Decreased odours and better overall ecosystem health without added chemicals Nanobubbles could complement existing floating treatment wetlands by addressing in-lake conditions, particularly in hotspots such as the northern arm.
Potential Solution Nanobubble Technology (Oxygen or Ozone-based)
Nanobubbles deliver sustained dissolved oxygen directly to the sediment-water interface, where traditional aeration often falls short. This raises oxidation-reduction potential, oxidises organic matter, promotes beneficial aerobic bacteria, and significantly reduces the release of bioavailable phosphorus from sediments (internal loading).
Benefits observed in similar eutrophic lakes include:
• Reduced phosphorus recycling (often 60–75% in targeted zones) • Lower chlorophyll-a, improved water clarity, and suppressed cyanobacterial blooms • Decreased odours and better overall ecosystem health without added chemicals Nanobubbles could complement existing floating treatment wetlands by addressing in-lake conditions, particularly in hotspots such as the northern arm.