Distinctive correlations between cell concentration and cell size to microalgae biomass under increasing carbon dioxide

Yi An Lim, Nicholas M.H. Khong, Sajeewa Dilshan Priyawardana, Khi Rern Ooi, I.M.S.K. Ilankoon, Meng Nan Chong, Su Chern Foo

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14 Citations (Scopus)


Carbon capture and storage (CCS) via microalgae cultivations is getting renewed interest as climate change mitigation effort, owing to its excellent photosynthetic and CO2 fixation capability. Microalgae growth is monitored based on their biomass, cell concentrations and cell sizes. The key parametric relationships on microalgae growth under CO2 are absent in previous studies and this inadequacy hampers the design and scale-up of microalgae-based CCS. In this study, three representative microalgae species, Chlorella, Nostoc and Chlamydomonas, were investigated for establishing key correlations of cell concentrations and sizes towards their biomass fluctuations under CO2 influences of 0% to 20% volume ratios (v/v). This revealed that Chlorella and Chlamydomonas cell concentrations significantly contributed towards increasing biomass concentration under CO2 elevations. Chlorella and Nostoc cell sizes were enhanced at 20% (v/v). These findings provided new perspectives on growth responses under increasing CO2 treatment, opening new avenues on CCS schemes engineering designs and biochemical production.

Original languageEnglish
Article number126733
Number of pages6
JournalBioresource Technology
Publication statusPublished - Mar 2022


  • Carbon dioxide
  • Cell concentration
  • Cell size
  • Microalgae biomass dry weight
  • Pearson correlation

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