The Challenge Nuisance odors 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 group of algae that flourishes in this kind of lagoon during the summer months does not settle like green algae but floats and accumulates at the surface, where it decays in the sun, giving off noxious odors. Suspended soli

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