title: Dispersed ozone flotation of Chlorella vulgaris.
abstract: Flotation separation of Chlorella vulgaris, a species with excellent potential for CO(2) capture and lipid production, was studied using dispersed ozone gas. Pure oxygen aeration did not yield flotation. Conversely, applying ozone effectively separation algae from broth through flotation. The ozone dose applied for sufficient algal flotation is <0.05 mg/g biomass, much lower than those used in practical drinking waterworks (0.1-0.3 mg/g suspended solids). Main products, lipid C16:0, was effectively collected in the flotage phase. The algae removal rate, surface charge, and hydrophobicity of algal cells, and proteins and polysaccharides contents of algogenic organic matter (AOM) were determined. Certain quantities of proteins were present in the cultivated algal suspension, hence, minimal quantity of ozone was required to release intracellular proteins as surfactants to lead to effective flotation.
authors.affiliation: Department of Chemical Engineering, National Taiwan University, Taipei 106, Taiwan.
authors.forename: Ya-Ling
authors.initials: YL
authors.lastname: Cheng
authors.forename: Yu-Chuan
authors.initials: YC
authors.lastname: Juang
authors.forename: Guan-Yu
authors.initials: GY
authors.lastname: Liao
authors.forename: Shih-Hsin
authors.initials: SH
authors.lastname: Ho
authors.forename: Kuei-Ling
authors.initials: KL
authors.lastname: Yeh
authors.forename: Chun-Yen
authors.initials: CY
authors.lastname: Chen
authors.forename: Jo-Shu
authors.initials: JS
authors.lastname: Chang
authors.forename: Jhy-Chern
authors.initials: JC
authors.lastname: Liu
authors.forename: Duu-Jong
authors.initials: DJ
authors.lastname: Lee
mesh_terms: D001419:Bacteria / Q000187:drug effects / Q000378:metabolism; D001422:Bacterial Adhesion / Q000187:drug effects; D001709:Biotechnology / Q000379:methods*; D048408:Chlorella vulgaris / Q000187:drug effects*; D006838:Hydrocarbons / Q000032:analysis / Q000494:pharmacology; D009391:Nephelometry and Turbidimetry; D009584:Nitrogen / Q000378:metabolism; D010126:Ozone / Q000494:pharmacology*; D011134:Polysaccharides / Q000378:metabolism
chemical_list: D006838:Hydrocarbons; D011134:Polysaccharides; D010126:Ozone; D009584:Nitrogen