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Fighting Algal Blooms in the Great Lakes
How Nanobubble Technology Helps Suppress Toxin-Producing Cyanobacteria
The Great Lakes supply drinking water to millions of Canadians and support fisheries, recreation, shipping, and tourism. Yet these waters are increasingly threatened by harmful algal blooms (HABs)-dense accumulations of cyanobacteria that can produce toxins, deplete oxygen, and damage ecosystems. Warming temperatures, nutrient runoff, and changing rainfall patterns have intensified the problem in recent years.
Traditional approaches to managing blooms-chemical treatments, mechanical aeration, and nutrient interception-provide temporary relief but rarely address the underlying water-quality imbalance. Nanobubble technology offers a new, sustainable solution for improving lake health and reducing bloom intensity.
How Nanobubbles Work in Natural Waters
Nanobubbles are exceptionally small gas bubbles (less than 200 nanometres) that remain stable in water for long periods. Their properties allow them to:
- Increase dissolved oxygen levels throughout the water column.
- Oxidize harmful substances, including nutrients that fuel cyanobacteria growth.
- Break down organic buildup in sediments.
- Enhance microbial activity, supporting beneficial bacteria.
- Naturally suppress algae, including toxin-producing cyanobacteria.
Reducing Cyanotoxins and Restoring Clarity
In lake and pond pilots across Canada, nanobubble generators have shown measurable impact:
- Lower concentrations of microcystin (a common cyanotoxin)
- Noticeable reductions in bloom density
- Improved water clarity and reduced odours
- Enhanced dissolved oxygen even during peak summer temperatures
Unlike chemical algaecides, nanobubbles restore ecological balance instead of damaging non-target species. They also work year-round, supporting winter oxygenation under ice.
A Sustainable Path for Great Lakes Watersheds
As governments and conservation groups invest in Great Lakes restoration, nanobubble technology is emerging as a scalable and environmentally responsible tool. Whether installed at marinas, inflow channels, stormwater retention areas, or municipal waterfronts, nanobubbles help maintain healthy water and reduce the environmental and economic impacts of HABs.
