Case study - Algae control in facultative oxidation lagoon


Courtesy of Courtesy of LG Sonic

In June 2012, the Brazilian public water company Sabesp decided to install one LG Sonic e-line device at their facultative oxidation lagoon in Itapetininga.

The Challenge: Blue-green Algae Cause Operational Problems

Nuisant odours caused by periodic occurrence of excessive quantities of filamentous, and blue-green algae were posing operational problems at the facultative lagoon in Itapetininga, state of São Paulo.

The Solution: Control Algae with the LG Sonic e-line

Installation of a LG Sonic e-line device in a 20,000-m2 and 1.5-meter deep facultative oxidation lagoon in June 2012. The unit was connected to a local power source. Ultrasonic treatment uses high frequency sound waves to control algal blooms in lakes, reservoirs and other applications.

The Results: Up to 80% Reduction of Cyanobacteria

Water samples were taken weekly to assess the evolution of the algal population. The laboratory of Sabesp monitored the phytoplankton in the water in terms of chlorophyll-a and cyanobacteria concentration (micrograms per liter). Results are evident just after 2 weeks treatment. After 2 months, the results showed a significant reduction of pigment concentration in the effluent that could be discharged safely into the nearby surface water.

Key Results

  • Up to 80 % reduction in Cyanobacteria concentration
  • Up to 60% reduction in Chlorophyll a concentration
  • Indirect improvement of adjoining river and waterways overall quality

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