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Lucakova, Simona; Branyikova, Irena; Kovacikova, Sara; Masojidek, Jiri; Ranglova, Karolina; Branyik, Tomas; Ruzicka, Marek C.
Bioresource technology, 20/May , Letnik: 351Journal Article
Display omitted •Novel continuous electrocoagulation reactor was developed, capacity 240 L/h.•Chlorella biomass harvesting efficiency was higher than 85 %.•Harvested biomass was suitable for human consumption, Fe content below 4 mg/g.•Power consumption was reduced by 80 % compared to centrifugation alone. The most frequently used method to harvest microalgae on an industrial scale is centrifugation, although this has very high energy costs. To reduce these costs, a continuous electrocoagulation process for harvesting Chlorella vulgaris was developed and tested using a pilot-scale 111 L working volume device consisting of an electrolyser with iron electrodes, aggregation channel and lamellar settler. The flow rate of the microalgal suspension through the device was 240 L/h. When using controlled cultivation and subsequent electrocoagulation, a high harvesting efficiency (above 85%), a low Fe contamination in the harvested biomass (<4 mg Fe/g dry biomass, a harvested biomass complied with legislative requirements for food) and significant energy savings were achieved. When comparing electrocoagulation and subsequent centrifugation with the use of centrifugation alone, energy savings were 80 % for a biomass harvesting concentration of 0.23 g/L. Electrocoagulation was thus proven to be a feasible pre-concentration method for harvesting microalgae.
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