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Scale-up and large-scale production of Tetraselmis sp. CTP4 (Chlorophyta) for CO2 mitigation: from an agar plate to 100-m3 industrial photobioreactors
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Scale-up and large-scale production of Tetraselmis sp. CTP4 (Chlorophyta) for CO2 mitigation: from an agar plate to 100-m3 industrial photobioreactors
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Journal Article
Scale-up and large-scale production of Tetraselmis sp. CTP4 (Chlorophyta) for CO2 mitigation: from an agar plate to 100-m3 industrial photobioreactors
2018
Overview
Industrial production of novel microalgal isolates is key to improving the current portfolio of available strains that are able to grow in large-scale production systems for different biotechnological applications, including carbon mitigation. In this context,
Tetraselmis
sp. CTP4 was successfully scaled up from an agar plate to 35- and 100-m
3
industrial scale tubular photobioreactors (PBR). Growth was performed semi-continuously for 60 days in the autumn-winter season (17
th
October – 14
th
December). Optimisation of tubular PBR operations showed that improved productivities were obtained at a culture velocity of 0.65–1.35 m s
−1
and a pH set-point for CO
2
injection of 8.0. Highest volumetric (0.08 ± 0.01 g L
−1
d
−1
) and areal (20.3 ± 3.2 g m
−2
d
−1
) biomass productivities were attained in the 100-m
3
PBR compared to those of the 35-m
3
PBR (0.05 ± 0.02 g L
−1
d
−1
and 13.5 ± 4.3 g m
−2
d
−1
, respectively). Lipid contents were similar in both PBRs (9–10% of ash free dry weight). CO
2
sequestration was followed in the 100-m
3
PBR, revealing a mean CO
2
mitigation efficiency of 65% and a biomass to carbon ratio of 1.80.
Tetraselmis
sp. CTP4 is thus a robust candidate for industrial-scale production with promising biomass productivities and photosynthetic efficiencies up to 3.5% of total solar irradiance.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
