3. Results and discussion
3.1. Microalgal recovery efficiency at different applied current The phenomenon of electrolytic flocculation is based on the
movement of negatively charged microalgae toward the anode after applying the electricity. After reaching the anode, the
negatively charged microalgal particles lose their charge and they form aggregates [27]. Electrolysis of water produces H2 and O2 gas bubbles at cathode and anode respectively that can aid the microalgal flocs to rise to the surface. The electrolytic flocculation process used in this study does not involve the use of sacrificial electrodes and no flocculants are required.