Tampa Tests Non-Invasive Ultrasonic Technology to Reduce Toxic Algae

TAMPA, FL — With the likelihood of the global climate pattern known as El Niño producing weather conditions this year that cause toxic blue-green algae to thrive in Florida's lakes, rivers and reservoirs, the Tampa Water Department is taking part in a two-year pilot program to test a new technology.

The city is using two ultrasonic buoys developed by LGSonic, a company based in Holland, to reduce blue-green algae growth in the Hillsborough River reservoir, the city's main source of drinking water.

The ultrasonic sound waves emitted by the buoys will block the algae’s access to sunlight and nutrients, causing the algae to sink to the bottom and die off without releasing toxins.

By eliminating the excessive growth of algae, the technology restores healthy Dissolved Oxygen (DO) levels in the water, which are essential to balance the ecosystem for aquatic life.

The effectiveness of LG Sonic’s ultrasound technology in moving water bodies, like the Hillsborough River, is still being assessed, but it has already shown promising results, according to LGSonic.

Related: El Nino Likely To Increase Toxic Algae On Florida Waterways, Says NOAA

The LGSonic buoys have a 2,600-foot radius and can project sound waves up to the riverbanks.

City of Tampa Water Production Manager John Ring is hoping this technology will help control algal blooms without the use of algaecides.

Studies have shown that the buoys are non-invasive and will not harm fish, plants, zooplankton and insects.

Ring said the ultrasonic buoys allow the frequency to be adjusted according to the type of bloom or algae species encountered, enabling continuous monitoring and control.

During the pilot program, the city will test the two locations with the buoys and collect data and samples to compare the ultrasonic method’s effectiveness to the traditional method of controlling algae using copper sulfate.

He hopes the use of the LG Sonic technology will not only maintain the quality of the city's water but improve the odor and taste of the city's water.

If successful, Ring said the sonic buoys could also reduce the water department’s operating costs to manage algae impacts.

The technology is currently being used in 20 countries worldwide, including several cities across the United States.

The Florida Department of Environmental Protection provided the city with a $115,254 grant that will cover the cost of the two buoys and installation