Cooking oil-surfactant emulsion in water for harvesting Chlorella vulgaris by sedimentation or flotation. (September 2020)

• Record Type: Journal Article
• Authors: Potocar, Tomas; Leite, Luan de Souza; Daniel, Luiz Antonio; Pivokonsky, Martin; Matoulkova, Dagmar; Branyik, Tomas
• Is Part Of: Bioresource technology. Volume 311(2020)
• Publication Date: 2020-09
• Subjects: Cetyltrimethylammonium bromide -- Chlorella vulgaris -- Cooking oil -- Sedimentation -- Flotation; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2020.123508
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Harvesting Chlorella vulgaris using a cooking oil-CTAB emulsion was studied. Over 90% harvesting efficiency (HE) was achieved at pH 10 and 12. HE ˃ 90% required 0.13–0.33% (v/v) cooking oil and 2.7–6.7 mg/L CTAB. Observed harvesting mechanisms were flocculation/sedimentation and flotation. Proteins increased the consumption of cooking oil-CTAB emulsion by up to 6 times. Abstract: 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.