Dispersed ozone flotation of Chlorella vulgaris

Ya Ling Cheng, Yu Chuan Juang, Guan Yu Liao, Shih Hsin Ho, Kuei Ling Yeh, Chun Yen Chen, Jo Shu Chang, Jhy Chern Liu, Duu Jong Lee

Research output: Contribution to journalArticlepeer-review

72 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)9092-9096
Number of pages5
JournalBioresource technology
Issue number23
Publication statusPublished - 2010 Dec

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal


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