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Nannochloropsis oceanica cultivation in pilot-scale raceway ponds—from design to cultivation
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Orientador(es)
Resumo(s)
Raceways ponds are the microalgal production systems most commonly used at industrial
scale. In this work, two di erent raceway configurations were tested under the same processing
conditions to compare their performance on the production of Nannochloropsis oceanica. Biomass
productivity, biochemical composition of the produced biomass, and power requirements to operate
those reactors were evaluated. Water depths of 0.20 and 0.13 m, and culture circulation velocities
of 0.30 and 0.15 m s1 were tested. A standard configuration, which had a full channel width
paddlewheel, proved to be the most energy e cient, consuming less than half of the energy required
by a modified configuration (had a half channel width paddlewheel). The later showed to have
slightly higher productivity, not enough to o set the large di erence in energetic consumption. Higher
flow velocity (0.30 m s1) led to a 1.7 g m2 d1 improvement of biomass productivity of the system,
but it increased the energy consumption twice as compared to the 0.15 m s1 flow velocity. The latter
velocity showed to be the most productive in lipids. A water depth of 0.20 m was the most suitable
option tested to cultivate microalgae, since it allowed a 54% energy saving. Therefore, a standard
raceway pond using a flow velocity of 0.3 m s1 with a 0.20 m water depth was the most e cient
system for microalgal cultivation. Conversely, a flow velocity of 0.15 m s1 was the most suitable to
produce lipids.
Descrição
Palavras-chave
Raceway pond configuration Nannochloropsis oceanica Biomass productivity Energy costs
Contexto Educativo
Citação
Editora
MDPI