Abstract
Control of temperature is a major challenge for industrial microalgae production in photobioreactors outdoors. Strains with tolerance for high temperatures can reduce the cost of production as active temperature control is not required. In this study, marine photoautotrophic microorganisms were isolated to reduce the need for control of high temperature.Twenty-two samples were taken from different saline waters on the Caribbean island Bonaire. During strain enrichment, a temperature of 40 °C was used as selective pressure and strains with the highest growth rate were selected. We isolated and identified 59 strains, after which 5 were selected for characterization on growth rate and biomass composition. Picochlorum sp. and Leptolyngbya sp. showed optimal growth at 40 °C and 35 °C with a growth rate of 0.12 h−1 during daytime, respectively. The strains contain 62.1% and 68.2% of protein and have varying fatty acid compositions suitable for application as edible oil and biofuel.
Highlights
Microalgae are recognised as a promising alternative to traditional crops
The Caribbean island Bonaire has been presented as a location which meets all these requirements [6]
Every culture contained a wide variety of species at the very beginning of the enrichment phase. This variety was greatly reduced by the stringent selective pressure applied on fast growth at 40 °C during daytime and 30 °C during the night
Summary
Microalgae are recognised as a promising alternative to traditional crops. They are unicellular photosynthetic microorganisms which can be grown in photobioreactors. Cultivation of microalgae can be done anywhere, as long as basic requirements for growth, such as sufficient light and nutrients, and tolerable temperatures are met. The ability to grow microalgae in photobioreactors and open ponds removes the requirement for arable land and creates opportunities for production in desert regions [3,4]. Sustainable and cost-effective production of microalgae should be done in places offering high solar irradiance, constant climatological conditions and seawater availability [5]. The Caribbean island Bonaire has been presented as a location which meets all these requirements [6]
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