Energy-Efficient Production of Microchloropsis salina Biomass with High CO2 Fixation Yield in Open Thin-Layer Cascade Photobioreactors

Author:

Koruyucu Ayşe12ORCID,Schädler Torben12,Gniffke Amelie1,Mundt Konrad1,Krippendorf Susann1ORCID,Urban Peter1,Blums Karlis1,Halim Billy1,Brück Thomas23ORCID,Weuster-Botz Dirk12ORCID

Affiliation:

1. Chair of Biochemical Engineering, School of Engineering and Design, Technical University of Munich, 85748 Garching, Germany

2. TUM-AlgaeTec Center, Technical University of Munich, 82024 Taufkirchen, Germany

3. Werner Siemens-Chair of Synthetic Biotechnology, School of Natural Sciences, Technical University of Munich, 85748 Garching, Germany

Abstract

Lipid production using microalgae is challenging for producing low-value-added products. Harnessing microalgae for their fast and efficient CO2 fixation capabilities may be more reasonable since algal biomass can be utilized as a precursor for various products in a biorefinery approach. This study aimed to optimize the productivity and efficiency of Microchloropsis salina biomass production in open thin-layer cascade (TLC) photobioreactors under physical simulation of suitable outdoor climate conditions, using an artificial seawater medium. Continuous operation proved to be the most suitable operating mode, allowing an average daily areal productivity of up to 27 g m−2 d−1 and CO2 fixation efficiency of up to 100%. Process transfer from 8 m2 to 50 m2 TLC photobioreactors was demonstrated, but with reduced daily areal productivity of 21 g m−2 d−1 and a reduced CO2 fixation efficiency, most probably due to increased temperatures at midday above 35 °C. An automated overnight switch-off of the circulation pumps was implemented successfully, reducing energy and freshwater requirements by ~40%. The ideal conditions for continuous production were determined to be a dilution rate of 0.150–0.225 d−1, pH of 8.5, and total alkalinity of 200–400 ppm, facilitating efficient pilot-scale production of microalgal biomass in TLC photobioreactors.

Funder

Federal Ministry of Education and Research

Publisher

MDPI AG

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