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Enhanced Photosynthetic Pigment Production Using a Scaled-Up Continuously Circulated Bioreactor.

Won-Kyu Lee1,2, Yong-Kyun Ryu1,2, Taeho Kim1

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The new ROSEMAX bioreactor significantly improves microalgae cultivation at pilot scale, yielding higher biomass and pigments compared to bubble columns. This enhanced circulation boosts photosynthetic efficiency and cell viability for industrial applications.

Keywords:
ROSEMAXTetraselmis sp.photosynthetic pigmentpilot scalescale-up

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Area of Science:

  • Biotechnology
  • Marine Biology
  • Chemical Engineering

Background:

  • Microalgae are valuable sources of chlorophylls and carotenoids.
  • Conventional bubble columns face challenges in large-scale microalgae cultivation, including cell sedimentation and reduced photosynthetic efficiency.

Purpose of the Study:

  • To evaluate the performance of the novel ROSEMAX bioreactor against a conventional bubble column for microalgae cultivation.
  • To assess the impact of bioreactor design on biomass production, pigment content, cell viability, and photosynthetic efficiency.

Main Methods:

  • Comparative study of ROSEMAX and bubble column bioreactors at laboratory and pilot scales.
  • Cultivation of *Tetraselmis* sp. microalgae.
  • Analysis of biomass, chlorophyll-a, and total carotene concentrations.
  • Flow cytometry to determine live cell proportion and photosynthetic efficiency.

Main Results:

  • No significant difference in biomass or pigment content at laboratory scale.
  • Pilot-scale ROSEMAX yielded significantly higher biomass (1.69 g/L DW), chlorophyll-a (14.60 mg/g DW), and carotene (5.64 mg/g DW) compared to bubble columns.
  • ROSEMAX showed 32.90% higher live cell proportion and 1.14 times higher photosynthetic efficiency.

Conclusions:

  • The continuously circulated ROSEMAX bioreactor is superior to conventional bubble columns for pilot-scale microalgae cultivation.
  • ROSEMAX effectively mitigates challenges like cell sedimentation and enhances photosynthetic performance.
  • ROSEMAX shows strong potential for industrial-scale applications in microalgae biomass and pigment production.