Dispersed ozone flotation of Chlorella vulgaris.
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.
Cheng
Ya-Ling
YL
Department of Chemical Engineering, National Taiwan University, Taipei 106, Taiwan.
Juang
Yu-Chuan
YC
Liao
Guan-Yu
GY
Ho
Shih-Hsin
SH
Yeh
Kuei-Ling
KL
Chen
Chun-Yen
CY
Chang
Jo-Shu
JS
Liu
Jhy-Chern
JC
Lee
Duu-Jong
DJ
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
D006838:Hydrocarbons; D011134:Polysaccharides; D010126:Ozone; D009584:Nitrogen