Comparison of four outdoor pilot-scale photobioreactors

Jeroen H. De Vree*, Rouke Bosma, Marcel Janssen, Maria J. Barbosa, René H. Wijffels

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

59 Citations (Scopus)

Abstract

Background: Microalgae are a potential source of sustainable commodities of fuels, chemicals and food and feed additives. The current high production costs, as a result of the low areal productivities, limit the application of microalgae in industry. A first step is determining how the different production system designs relate to each other under identical climate conditions. The productivity and photosynthetic efficiency of Nannochloropsis sp. CCAP 211/78 cultivated in four different outdoor continuously operated pilot-scale photobioreactors under the same climatological conditions were compared. The optimal dilution rate was determined for each photobioreactor by operation of the different photobioreactors at different dilution rates. Results: In vertical photobioreactors, higher areal productivities and photosynthetic efficiencies, 19-24 g m-2 day-1 and 2.4-4.2 %, respectively, were found in comparison to the horizontal systems; 12-15 g m-2 day-1 and 1.5-1.8 %. The higher ground areal productivity in the vertical systems could be explained by light dilution in combination with a higher light capture. In the raceway pond low productivities were obtained, due to the long optical path in this system. Areal productivities in all systems increased with increasing photon flux densities up to a photon flux density of 30 mol m-2 day-1. Photosynthetic efficiencies remained constant in all systems with increasing photon flux densities. The highest photosynthetic efficiencies obtained were; 4.2 % for the vertical tubular photobioreactor, 3.8 % for the flat panel reactor, 1.8 % for the horizontal tubular reactor, and 1.5 % for the open raceway pond. Conclusions: Vertical photobioreactors resulted in higher areal productivities than horizontal photobioreactors because of the lower incident photon flux densities on the reactor surface. The flat panel photobioreactor resulted, among the vertical photobioreactors studied, in the highest average photosynthetic efficiency, areal and volumetric productivities due to the short optical path. Photobioreactor light interception should be further optimized to maximize ground areal productivity and photosynthetic efficiency.

Original languageEnglish
Article number215
JournalBiotechnology for Biofuels
Volume8
Issue number1
DOIs
Publication statusPublished - 18 Dec 2015

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Photobioreactors
Productivity
productivity
photon flux density
Photons
Fluxes
Dilution
dilution
Microalgae
Ponds
Light
pond
comparison
Food Additives
production cost
interception
climate conditions
production system
commodity
Climate

Keywords

  • Areal productivity
  • Microalgae
  • Nannochloropsis sp.
  • Outdoor
  • Photobioreactors
  • Photosynthetic efficiency
  • Pilot-scale

Cite this

@article{9d54e655440940ea90c4708f30bb0539,
title = "Comparison of four outdoor pilot-scale photobioreactors",
abstract = "Background: Microalgae are a potential source of sustainable commodities of fuels, chemicals and food and feed additives. The current high production costs, as a result of the low areal productivities, limit the application of microalgae in industry. A first step is determining how the different production system designs relate to each other under identical climate conditions. The productivity and photosynthetic efficiency of Nannochloropsis sp. CCAP 211/78 cultivated in four different outdoor continuously operated pilot-scale photobioreactors under the same climatological conditions were compared. The optimal dilution rate was determined for each photobioreactor by operation of the different photobioreactors at different dilution rates. Results: In vertical photobioreactors, higher areal productivities and photosynthetic efficiencies, 19-24 g m-2 day-1 and 2.4-4.2 {\%}, respectively, were found in comparison to the horizontal systems; 12-15 g m-2 day-1 and 1.5-1.8 {\%}. The higher ground areal productivity in the vertical systems could be explained by light dilution in combination with a higher light capture. In the raceway pond low productivities were obtained, due to the long optical path in this system. Areal productivities in all systems increased with increasing photon flux densities up to a photon flux density of 30 mol m-2 day-1. Photosynthetic efficiencies remained constant in all systems with increasing photon flux densities. The highest photosynthetic efficiencies obtained were; 4.2 {\%} for the vertical tubular photobioreactor, 3.8 {\%} for the flat panel reactor, 1.8 {\%} for the horizontal tubular reactor, and 1.5 {\%} for the open raceway pond. Conclusions: Vertical photobioreactors resulted in higher areal productivities than horizontal photobioreactors because of the lower incident photon flux densities on the reactor surface. The flat panel photobioreactor resulted, among the vertical photobioreactors studied, in the highest average photosynthetic efficiency, areal and volumetric productivities due to the short optical path. Photobioreactor light interception should be further optimized to maximize ground areal productivity and photosynthetic efficiency.",
keywords = "Areal productivity, Microalgae, Nannochloropsis sp., Outdoor, Photobioreactors, Photosynthetic efficiency, Pilot-scale",
author = "{De Vree}, {Jeroen H.} and Rouke Bosma and Marcel Janssen and Barbosa, {Maria J.} and Wijffels, {Ren{\'e} H.}",
year = "2015",
month = "12",
day = "18",
doi = "10.1186/s13068-015-0400-2",
language = "English",
volume = "8",
journal = "Biotechnology for Biofuels",
issn = "1754-6834",
publisher = "Springer Verlag",
number = "1",

}

Comparison of four outdoor pilot-scale photobioreactors. / De Vree, Jeroen H.; Bosma, Rouke; Janssen, Marcel; Barbosa, Maria J.; Wijffels, René H.

In: Biotechnology for Biofuels, Vol. 8, No. 1, 215, 18.12.2015.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Comparison of four outdoor pilot-scale photobioreactors

AU - De Vree, Jeroen H.

AU - Bosma, Rouke

AU - Janssen, Marcel

AU - Barbosa, Maria J.

AU - Wijffels, René H.

PY - 2015/12/18

Y1 - 2015/12/18

N2 - Background: Microalgae are a potential source of sustainable commodities of fuels, chemicals and food and feed additives. The current high production costs, as a result of the low areal productivities, limit the application of microalgae in industry. A first step is determining how the different production system designs relate to each other under identical climate conditions. The productivity and photosynthetic efficiency of Nannochloropsis sp. CCAP 211/78 cultivated in four different outdoor continuously operated pilot-scale photobioreactors under the same climatological conditions were compared. The optimal dilution rate was determined for each photobioreactor by operation of the different photobioreactors at different dilution rates. Results: In vertical photobioreactors, higher areal productivities and photosynthetic efficiencies, 19-24 g m-2 day-1 and 2.4-4.2 %, respectively, were found in comparison to the horizontal systems; 12-15 g m-2 day-1 and 1.5-1.8 %. The higher ground areal productivity in the vertical systems could be explained by light dilution in combination with a higher light capture. In the raceway pond low productivities were obtained, due to the long optical path in this system. Areal productivities in all systems increased with increasing photon flux densities up to a photon flux density of 30 mol m-2 day-1. Photosynthetic efficiencies remained constant in all systems with increasing photon flux densities. The highest photosynthetic efficiencies obtained were; 4.2 % for the vertical tubular photobioreactor, 3.8 % for the flat panel reactor, 1.8 % for the horizontal tubular reactor, and 1.5 % for the open raceway pond. Conclusions: Vertical photobioreactors resulted in higher areal productivities than horizontal photobioreactors because of the lower incident photon flux densities on the reactor surface. The flat panel photobioreactor resulted, among the vertical photobioreactors studied, in the highest average photosynthetic efficiency, areal and volumetric productivities due to the short optical path. Photobioreactor light interception should be further optimized to maximize ground areal productivity and photosynthetic efficiency.

AB - Background: Microalgae are a potential source of sustainable commodities of fuels, chemicals and food and feed additives. The current high production costs, as a result of the low areal productivities, limit the application of microalgae in industry. A first step is determining how the different production system designs relate to each other under identical climate conditions. The productivity and photosynthetic efficiency of Nannochloropsis sp. CCAP 211/78 cultivated in four different outdoor continuously operated pilot-scale photobioreactors under the same climatological conditions were compared. The optimal dilution rate was determined for each photobioreactor by operation of the different photobioreactors at different dilution rates. Results: In vertical photobioreactors, higher areal productivities and photosynthetic efficiencies, 19-24 g m-2 day-1 and 2.4-4.2 %, respectively, were found in comparison to the horizontal systems; 12-15 g m-2 day-1 and 1.5-1.8 %. The higher ground areal productivity in the vertical systems could be explained by light dilution in combination with a higher light capture. In the raceway pond low productivities were obtained, due to the long optical path in this system. Areal productivities in all systems increased with increasing photon flux densities up to a photon flux density of 30 mol m-2 day-1. Photosynthetic efficiencies remained constant in all systems with increasing photon flux densities. The highest photosynthetic efficiencies obtained were; 4.2 % for the vertical tubular photobioreactor, 3.8 % for the flat panel reactor, 1.8 % for the horizontal tubular reactor, and 1.5 % for the open raceway pond. Conclusions: Vertical photobioreactors resulted in higher areal productivities than horizontal photobioreactors because of the lower incident photon flux densities on the reactor surface. The flat panel photobioreactor resulted, among the vertical photobioreactors studied, in the highest average photosynthetic efficiency, areal and volumetric productivities due to the short optical path. Photobioreactor light interception should be further optimized to maximize ground areal productivity and photosynthetic efficiency.

KW - Areal productivity

KW - Microalgae

KW - Nannochloropsis sp.

KW - Outdoor

KW - Photobioreactors

KW - Photosynthetic efficiency

KW - Pilot-scale

U2 - 10.1186/s13068-015-0400-2

DO - 10.1186/s13068-015-0400-2

M3 - Article

VL - 8

JO - Biotechnology for Biofuels

JF - Biotechnology for Biofuels

SN - 1754-6834

IS - 1

M1 - 215

ER -