Microalgae Recovery via Alkaline Flocculation in a Stabilization Pond

Abstract

Purpose: This research study aimed to investigate alkaline flocculation for the recovery of biomass found in wastewater, with the presence of microalgae collected from the maturation pond of a Wastewater Treatment Station in Brazil. Methods: Alkaline flocculation assays were conducted up to 24 hours after samples were collected due to the nature of alkaline flocculation, which may occur spontaneously if samples are stored for too long. Flocculation was obtained using the three proposed bases: sodium hydroxide, calcium hydroxide and sodium carbonate. Results and conclusion: The efficiency tended to increase with increased pH. Sodium hydroxide as the base produced better results for pH values 11 and 12. Research implications: Possibility of dual use of microalgae, in bioremediation and, in doing so, in the production of biomass that can later be converted into biofuels. Originality/value: The search for sustainable technologies and the possibilities of use presented by microalgae is clear about the need to develop cultivation and harvesting methods that are economically viable.