University of Toledo Researchers Develop "Bacteria-Busting" Buoys to Provide Sustained, Targeted Defense Against Toxic Algae Blooms

University of Toledo researchers design specialized buoys that slowly release algaecide to eliminate toxic cyanobacteria for months without manual reapplication.

By: AXL Media

Published: Mar 31, 2026, 4:17 AM EDT

Source: Information for this report was sourced from American Chemical Society

Automating the Fight Against Cyanobacteria

Harmful algal blooms, primarily driven by nutrient-rich fertilizer runoff, represent a significant threat to global water security and public health. When cyanobacteria proliferate, they release potent toxins that can render municipal water supplies undrinkable, as seen during the 2014 Lake Erie crisis. Traditional methods of treating these blooms often require labor-intensive, repeated applications of algaecides that are expensive and difficult to scale. To address this, a research team from the University of Toledo has designed an autonomous delivery system. By using specialized buoys tethered at the site of a bloom, the researchers have created a method for consistent, long-term chemical distribution that requires minimal human intervention.

The Engineering of a "Set it and Forget it" System

The researchers, including Yakov Lapitsky and Youngwoo Seo, constructed their buoys using standard PVC pipes in "T" or cross-shaped configurations. The internal reservoirs of these devices are filled with a commercial hydrogen peroxide-based algaecide. To control the release of the liquid into the surrounding environment, the team inserted hydrogel disks into the pipe openings. These disks act as a semi-permeable barrier, allowing the algaecide to diffuse steadily into the water over several weeks or months. This controlled-release mechanism ensures that the concentration of the treatment remains at an effective level without the "spike and drop" effect seen in manual applications.

Visual Indicators for Maintenance and Refills

One of the most practical features of the new buoy design is its built-in notification system. The devices are engineered with specific buoyancy characteristics that change as the algaecide reservoir empties. Once the chemical supply is exhausted, the buoy loses its upright orientation and tips onto its side. This simple, mechanical signal allows water quality managers to identify which units need a refill from a distance, further reducing the labor costs associated with monitoring vast bodies of water. This visual cue transforms the buoy from a passive tool into an active part of a managed environmental defense network.