Harvesting algae using electricity, technically termed electroflocculation, was tested at different voltage settings to find the ideal voltage to produce the best quality microalgae paste. The study found that 7 volts was the magic number, producing the best harvest biomass with low metal contamination. It was also found that storing the paste in a chiller instead of a freezer maintained higher cell viability for later use. The paste can be reactivated even after 6 months in storage and can still be used as a starter culture for aquaculture.
This study was published last 01 December 2022 by SEAFDEC/AQD Associate Researcher Annie U. Villa-Franco in the Journal of Applied Phycology. Her co-authors were Christine Marie L. Teves, Knessa Louie G. Dato-on, Evelyn Grace D. J. Ayson, Roselyn C. Usero, and Milagros R. de la Peña
You may request the full research paper here: https://repository.seafdec.org.ph/handle/10862/6405