TY - JOUR
T1 - An integrated growth kinetics and computational fluid dynamics model for the analysis of algal productivity in open raceway ponds
AU - Amini, Hossein
AU - Wang, Lijun
AU - Hashemisohi, Abolhasan
AU - Shahbazi, Abolghasem
AU - Bikdash, Marwan
AU - KC, Dukka
AU - Yuan, Wenqiao
N1 - Publisher Copyright:
© 2018 Elsevier B.V.
PY - 2018/2
Y1 - 2018/2
N2 - An integrated growth kinetic, light transfer and computational fluid dynamics (CFD) model was developed to simulate the algal growth in open raceway ponds (ORP). C. vulgaris was used as a model algal strain. The coefficients of the growth kinetics were experimentally determined for the prediction of the growth of C. vulgaris as a function of environmental factors of light intensity, temperature and pH value. Experiments were conducted to grow C. vulgaris in lab-scale ORPs with medium depths of 0.20, 0.25 and 0.30 m to validate the mathematical model. The final measured biomass concentration after the 3-week growth were 0.48, 0.41, and 0.35 g/L for the ORPs with the medium depths of 0.20, 0.25, and 0.30 m, respectively. The predicted algal productivities for a 3-week cultivation were 7.3, 7.4, and 7.5 g/m2/day for depths of 0.20, 0.25, and 0.30 m, respectively, which well agreed with the measured values of 6.8, 7.2 and 7.4 g/m2/day, respectively. The biomass productivity decreased with the increase of growth time due to the increase of cell concentration. The model was further used to analyze the effects of different harvesting strategies on the algal productivity in ORPs. The algal productivity for the 3-week cultivation in the ORP with a 0.2 m depth by harvesting 50% algae at the target 0.2 g/L cell density was 10.5 g/m2/day, which was 43.8% higher than 7.3 g/m2/day for the 3-week cultivation under the same condition without harvesting at a final cell density of 0.48 g/L. The average algal productivity decreased with the increase of harvesting cell density.
AB - An integrated growth kinetic, light transfer and computational fluid dynamics (CFD) model was developed to simulate the algal growth in open raceway ponds (ORP). C. vulgaris was used as a model algal strain. The coefficients of the growth kinetics were experimentally determined for the prediction of the growth of C. vulgaris as a function of environmental factors of light intensity, temperature and pH value. Experiments were conducted to grow C. vulgaris in lab-scale ORPs with medium depths of 0.20, 0.25 and 0.30 m to validate the mathematical model. The final measured biomass concentration after the 3-week growth were 0.48, 0.41, and 0.35 g/L for the ORPs with the medium depths of 0.20, 0.25, and 0.30 m, respectively. The predicted algal productivities for a 3-week cultivation were 7.3, 7.4, and 7.5 g/m2/day for depths of 0.20, 0.25, and 0.30 m, respectively, which well agreed with the measured values of 6.8, 7.2 and 7.4 g/m2/day, respectively. The biomass productivity decreased with the increase of growth time due to the increase of cell concentration. The model was further used to analyze the effects of different harvesting strategies on the algal productivity in ORPs. The algal productivity for the 3-week cultivation in the ORP with a 0.2 m depth by harvesting 50% algae at the target 0.2 g/L cell density was 10.5 g/m2/day, which was 43.8% higher than 7.3 g/m2/day for the 3-week cultivation under the same condition without harvesting at a final cell density of 0.48 g/L. The average algal productivity decreased with the increase of harvesting cell density.
KW - Algal harvesting strategy
KW - Computational fluid dynamics model
KW - Microalgal prdocutivity
KW - Microalge growth kinetics
KW - Open raceway pond
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U2 - 10.1016/j.compag.2018.01.010
DO - 10.1016/j.compag.2018.01.010
M3 - Article
AN - SCOPUS:85041341513
SN - 0168-1699
VL - 145
SP - 363
EP - 372
JO - Computers and Electronics in Agriculture
JF - Computers and Electronics in Agriculture
ER -