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Improving microalgae harvesting efficiency: electrochemical techniques and parameter optimization
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DOI：10.1039/D5EW00518C.png)
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Abstract
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The harvesting microalgae is a challenging process that requires innovative and efficient technologies to make large-scale cultivation economically viable. This study investigated the effectiveness of electrochemical methods for harvesting microalgae Chlorella vulgaris. The operational parameters; such as electrolysis time; electrical current; and pH; were optimized using the response surface methodology based on the Box–Behnken design. The boron-doped diamond (BDD); aluminum (Al); and iron (Fe) electrodes were tested and compared. BDD–Al showed 99.3% of harvesting efficiency (time: 20 min; current: 100 mA; pH: 9); which is the highest value and a pH of 9. The physicochemical properties of the harvested algae; including lipids; proteins; carbohydrates; total suspended solids; and chlorophyll-a content; were examined. The content of harvested algae was found as 41.07–46.63% for protein; 5.5–16.9% for lipid; and 9.02–12.08% for carbohydrates (sugar). The chlorophyll-a concentrations varied from 6.7 to 8.36 μg mL−1. Optimized operating conditions for electrolysis time; pH; and current were determined; and harvesting efficiency was achieved at more than 99%. Energy consumptions for the highest harvesting efficiencies were found to be 0.2; 0.35; and 0.4 kWh kg−1 for BDD–Al; Al–Al; and Al–BDD electrode pairs; respectively. These values were lower than those of conventional algae harvesting methods. The results showed that the electrochemical harvesting techniques are promising alternatives with a high harvesting efficiency and low energy consumption.
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