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    Cooking oil-surfactant emulsion in water for harvesting Chlorella vulgaris by sedimentation or flotation

    Year: 2020

    Journal: Bioresour. Technol., Volume 311, SEP

    Authors: Potocar, Tomas; Leite, Luan de Souza; Daniel, Luiz Antonio; Pivokonsky, Martin; Matoulkova, Dagmar; Branyik, Tomas

    Organizations: Grant Agency of the Czech RepublicGrant Agency of the Czech Republic [18-05007S]; Ministry of Agriculture of the Czech RepublicMinistry of Agriculture, Czech Republic [MZE-RO1918]; FAPESP (Foundation for Research Support of the State of Sao Paulo - Brazil)Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [2018/01218-3]

    Keywords: Cetyltrimethylammonium bromide; Chlorella vulgaris; Cooking oil; Sedimentation; Flotation

    In this study, a novel harvesting emulsion (HEM) consisting of cooking oil in an aqueous solution of cetyltrimethylammonium bromide (CTAB) was tested for the harvesting of a technologically important microalga, Chlorella vulgaris. The influence of HEM dose, biomass and bovine serum albumin (BSA) (model interferer compound) on harvesting efficiency (E) were studied. The HEM E was over 90% at pH 10 (0.33% (v/v) cooking oil, 6.7 mg/L of CTAB) and 12 (0.13% (v/v) cooking oil, 2.7 mg/L of CTAB). Harvesting efficiencies at pH 4 and 7 were < 73.5% due to the absence of precipitate formation. Bovine serum albumin (10 mg/L) increased the HEM dose necessary to achieve E (>) 90% by 1.2 (pH 10), and 3 fold (pH 12). By manipulating the dose of HEM and pH, the method of harvesting (flocculation/sedimentation or flotation) was adjustable depending on the technological requirements.
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