Objective: Third generation biorefineries based on microalgae biomass seem to be
a great potential to supply future fuel consumption. However, technological challenges must
be faced; such as microalgae harvesting, which is one of the most important bottlenecks.
Several technics have been proposed to harvest microalgae such as centrifugation, flotation,
precipitation, among others. However, some of them have economical, technical or environmental
limitations. In this work, electroflocculation is examined to harvest microalgae
using wastewater as growth media.
Methods: The best conditions for current intensity, potential, electrodes material, electrolyte
and resident time were determined by cyclic voltamperometry, for batch and continuous
Results: Through the results of the analysis, the anodic and cathodic reactions were determined
and the electroflocculation process performance has been explained. It was observed that oxygen
release from the anode contributes significantly to microalgae separation process.
Conclusion: Based on these results, it can be established that electroflocculation has a great
potential, from a technical and economical point of view, to harvest microalgae.