less is more - algae biomass organizationalgaebiomass.org/wp-content/gallery/2012-algae...less is...
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Less is More
Optimization of geometric design of GemTubeTM tubular Photo-Bioreactors
for commercial mass cultivation of micro-algae
Eugène Roebroeck & Sander Hazewinkel
ABO SUMMIT Phoenix 24th October 2016
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History
•2006 LGemfounded•2007 Two-phaseflowimplemented•2008 Firstsalesofalgalproduct•2010 PrototypeofGemTube PBR•2011 Jointpatentfiled•2012 FirstsalesofGemTube PBR
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LGem’s Two-PhaseProcess
• FlowofGasandLiquid• NoaccumulationofO2• SmallpH-gradient
• Gentlebutthoroughmixing• Preventionoffouling
• LowPowerConsumption• <100Watts/m3
• LongLoopLength• >250meter
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Preventionoffouling
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….to…..
Easy…..
…..drain!
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Easyto clean
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SyntheticGenomicsCaliforniaOutside
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UniversidaddeQueretaroMexicoOutside
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WageningenUR NetherlandsGreenhouse
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FryMarine NetherlandsClimate Room(LED)
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LGem’s DemoPlantGeorgFischerPVC-UTubes
18,000Liter.500m2 :4mx125m
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UniversityofBergenNorwayDuran®Glass Tubes
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VerticalDesign
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HorizontalDesign
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What is the effect of Spacing on Productivity?
….and on production costs per unit of product
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EffectofSpacingonProductivity
SPECIFICSCENARIO/CASE
• Horizontaldesign• Location:TheNetherlands• Tubediameter:6cm• Phaeodactylum tricornutum
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01020304050
0
5
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0 10 20 30 40 50 ANNUA
LYIELD[TONS.HA
-1.Y-1]
AREA
LPR
ODU
CTIVITY[G.M
-2.DAY-1]
SPACING[CM]
Effectofspacingonarealproductivity
4 cm
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0.0
0.1
0.2
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0.5
0.6
0.0
5.0
10.0
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25.0
30.0
35.0
40.0
45.0
50.0
0 10 20 30 40 50 VOLU
METRICPR
ODU
CTIVITY[G.L-1.D-1]
LITERS
PER
M2INSTAL
LED
SPACING[CM]
Effectofspacingonvolumetricproductivity
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CAPEXfactors
GemTube PBR
• Investment• Pilot:30€.L-1• Demo:10€.L-1• Production:7€.L-1
•Amortization- 1€.L-1.y-1
Landcost
• Investment•GreenhouseNL•1M€perha
•Rent•4€.m-2.y-1
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Land cost: 40.000 € per ha per yearIndepend of spacing
€-€50,000.00
€100,000.00€150,000.00€200,000.00€250,000.00€300,000.00€350,000.00€400,000.00€450,000.00€500,000.00
0 10 20 30 40 50
CAPEXperHectare(€peryear)Amortization on PBR: 1 € per litre per yearDecreases with increase spacing
Spacing [cm]
LANDPBR
TOTAL
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0
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30
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60
0 10 20 30 40 50
YIELD[TONS.HA
-1.Y-1]
SPACING[CM}
yield
€-
€5.00
€10.00
€15.00
€20.00
0 10 20 30 40 50
CAPEXperkgofproduct[€]
4 cmHighest Yield 8 cm Lowest Costs
€6,87 €6,05
LANDPBRTOTAL
CAPEX per ha per year
Yield per ha per year= CAPEX per kg
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PBRLand€-
€5.00
€10.00
€15.00
€20.00
€25.00
€30.00
€35.00
€40.00
€45.00
€50.00
0 20 40 60 80 100
CAPEXperkgofproduct[€]
0
10
20
30
40
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60
0 20 40 60 80 100
ton.ha-1.y-1
Spacing 70 cm
Lowest Costs
Spacing 25 cm
Highest Yield
€14,59 €9,61
“VerticalDesign”
Total
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Less is MoreDesign Horizontal
Spacingcm
InstalledVolumeL.m-2
Yield
Ton.ha-1.y-1
CAPEX
€.kg-1Vertical(9 layers)
25 82 59 14,59
Vertical(9 layers)
70 34 39 9,61
Horizontal 4 28 47 6,87
Horizontal 8 20 40 6,05
Less tubes per m2 installed results in More biomass per Euro invested
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