Harvesting Nannochloropsis oculata microalgae by electrocoagulation method using iron, aluminum and graphite electrodes
Subject Areas : New Technologies in Aquaculture Development
1 - Department of Fisheries, Science and Research Branch, Islamic Azad University, Tehran, Iran.
Keywords: Nannochloropsis oculata, Algae harvesting, Electrochemistry, Electrocoagulation,
Abstract :
Microalgae harvesting is a two-step process that included the separation of supernatant liquid phase from biomass or solid phase that starts after mass production. The purpose of this research is to collect Nannochloropsis oculata microalgae by electrocoagulation method with different electrodes (iron, aluminum and graphite), and their effect on harvesting efficiency, the number of microalgae cells after harvesting and the coagulation rate of microalgae, which was evaluated during 20 minutes. The highest harvesting efficiency was measured in the control and aluminum electrode treatments (P<0.05). The results of this study showed that the electrochemical harvesting of microalgae N. oculata by metallic (iron and aluminum) and non-metallic (graphite) electrodes caused significant changes in the number of cells after harvesting, the amount of ash and the concentration of algae. Aluminum electrode treatment showed the highest algae harvesting efficiency (96.47±0.48%) and the lowest harvesting efficiency was observed in graphite electrode (74.92±1.33%) (P<0.05). Also, the coagulation rate of microalgae Nansoclepis oculata was faster in aluminum treatment (P<0.05). According to the results obtained in this research, electrocoagulation with aluminum electrode is an effective method for coagulation and harvesting of N. oculata microalgae cells. Therefore, it can be used as a suitable method and a profitable alternative in the recovery of biomass and the production of concentrated N. oculata microalgae for various industries such as biodiesel.
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