Dispersed ozone flotation of Chlorella vulgaris
Journal
Bioresource Technology
Journal Volume
101
Journal Issue
23
Pages
9092-9096
Date Issued
2010
Author(s)
Abstract
Flotation separation of Chlorella vulgaris, a species with excellent potential for CO2 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 <0.05mg/g biomass, much lower than those used in practical drinking waterworks (0.1-0.3mg/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. ? 2010 Elsevier Ltd.
Subjects
Algae
Algogenic organic matters
Flotation
Harvesting
Ozone
Type
journal article