Sustainability in Algae Biofuel Production
Transcript of Sustainability in Algae Biofuel Production
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Department of Agricultural and Biosystems Engineering
The University of Arizona
Prof. Joel L. Cuello, Ph.D.
Sustainability inAlgae Biofuel Production
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Algae
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Algae constitute a rich Biochemical Factory
that remainslargely untapped!
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Global Annual Microalgae Production
Spirulina 3000 t DW China, India, USA, Human/animal nutritionMyanmar, Japan cosmetics, phycobili
Chlorella 2000 t DW Taiwan, Germany, Human nutrition, Japan aquaculture, cosmetics
Dunaliella salina 1200 t DW Australia, Israel, Human nutrition,USA, China cosmetics, b-carotene
Haematococcus pluvialis 300 t DW USA, India, Aquaculture,Israel astaxanthin
Crypthecodinium cohnii 240 t DHA oil USA DHA oil
Total = about 5000 t DW/yr, US$1.25 x 109/yr
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1.0 Algae for Nutraceuticals
(Omega 3/6 -- DHA, EPA, AA)
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Omega-3/6 Fatty Acids
DHA, EPA, AA
Reduce cardiovascular diseases and obesity
Play role in cellular and tissue metabolism, includingthe regulation of membrane fluidity, electron and oxygen transport, thermal adaptation (Cardozo 2007, Guaratini et al. 2007).
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Products from Microalgae
Eicosapentaenoic Acid (EPA, 20:5n3)
%TFA
Cod Liver Oil 12.45Isochrysis galbana 22.60Phaeodactylum tricornutum 29.83Porphyridium cruentum 23.90
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2.0 Algae for Animal Feeds
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Algae as Feed:
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Algae as Animal Feed
-- Improved immune response, improved fertility, better weight control, healthier skin and a lustrous coat (Pulz and Gross 2004)
-- Adding algae to the diet of cows resulted in a lower natural breakdown of unsaturated fatty acids and a higher concentration of these beneficial compoundsin meat and milk
-- Improves the color of the skin, shanks and egg yolks of poultry
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3.0 Algae for Fish Production
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Algae:
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Algae as Fish Feed
-- For hatchery and nursery of bivalves, shrimp, and some finfish cultures
-- For producing zooplankton, typically rotifers, which are fed to the freshly hatched carnivorous fish (Benemann and Oswald 1996)
-- 62% for mollusks, 21% for shrimps and 16% for fish
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China’s Zhejiang Mariculture Research Institute
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4.0 Algae for Cosmetics
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Algae:
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Algae for Cosmetics
-- For anti-aging cream, regenerating care products, emollient, anti-irritant in peelers, sun protection andhair care products
-- Repair signs of early skin aging, exert skin-tightening effect, prevent stria formation and stimulate collagen synthesis in skin (Spolaore et al. 2006).
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5.0 Algae for Biofuels
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Algae: Biodiesel Yield (L/ha-yr)
Soybeans 446Rapeseed 119Mustard 1300Jatropha 1892Palm Oil 5950Algae (Low) 45000Algae (High) 137000
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Food Vs. Fuel
Food Wins!
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Corn Field
Algae Pond
Chisti (2007)
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Algae:
•Can accumulate hydrocarbons•Can accumulate fatty acids•Can accumulate starch•Can synthesize hydrogen gas
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Biofuel/Nutraceutical Production from Algae
Species/Strain Selection
Mass Production of Algae
Harvesting
Dewatering
Product Extraction/Processing
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Two Ways to Mass Produce Algae:
Open Ponds
Photobioreactors
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Open Pond System
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Open Pond System
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Open Pond System
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Open Pond System
Cyanotech, Hawaii
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Photobioreactors
LightNutrientsCO2MixingCulture DensitypHTemperatureFlow Rateetc.
Controlled
Algae
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Photobioreactor Designs
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Photobioreactor Designs
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Photobioreactor Designs
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Photobioreactor Designs
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Photobioreactors
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Photobioreactor Designs
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Algae for Biofuels andOther Products
Require:
Techno-economic Feasibility
AND
Environmental Sustainability
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Algae for Biofuels andOther Products
Environmental Sustainability:
● Water use● Nutrients use● Land use● Energy use
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Comparisons
•Capital Cost + -•Energy + -•Land Area - +•Water Loss - +•Productivity - +•Risk of contamination - +
Open Ponds Photobioreactors
Environmental sustainability criteria must bepart of system assessment
Because ofexpensive materialsused (glass, PVC)
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Innovative Strategy 1
Algenol Approach
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Microalgae Production Pathway
Species/Strain Selection
Mass Production
Harvesting
Dewatering
Product Extraction
Product Separation
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Algenol, U.S.A.
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Algenol, U.S.A.
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Algenol, U.S.A.
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Algenol, U.S.A.
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Algenol, U.S.A.
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Microalgae Production Pathway
Species/Strain Selection
Mass Production
Harvesting
Dewatering
Product Extraction
Product Separation
WaterNutrientsCyanobacteria
Water
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Innovative Strategy 2
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Designing Novel, Low-Cost andSustainable
Photobioreactors
Innovative Strategy 2:
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NASA’s Offshore Membrane Enclosure for Growing Algae (OMEGA)
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ACCORDIONPhotobioreactor
Low-Cost and High-Performance Photobioreactor
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ACCORDION PhotobioreactorU.S. and International Patents Pending
Licensed to Biopharmia, LLC
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New Model
Accordion Photobioreactorsfor Growing Algae for Nutraceuticals, Fish/Animal Feed, Biofuels and Others
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Reservoir
ACCORDION Photobioreactor
Air
Regular AirAccordion
Vertical series of angled flat plates
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(A) (B) (C)
Accordion Photobioreactor
Improves:Light incidenceLiquid mixingBubble breakup
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ACCORDION PhotobioreactorA Vertical series of angled flat plates
Advantages:
Low-costSimple designModular designSimple maintenanceLower power requirementAdjustable light incidenceAdjustable flow Ease of scale upEase of harvesting
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Accordion Photobioreactor
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New Model
Accordion Photobioreactors
Durable plastics
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Accordion Photobioreactors
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Accordion Photobioreactors
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Microalgae Production Pathway
Species/Strain Selection
Mass Production
Harvesting
Dewatering
Product Extraction
Conversion
Water &NutrientsRecycle
Minimal water loss
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M. subterraneus in Accordion PBR in GreenhouseDay 24
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M. subterraneus in Accordion PBR in GreenhouseDay 24
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EPA contents and Growth of M. subterraneus in ACCORDION and control Laboratory Flask
Flask (1 L) Air Accordion (35 L)
EPA content (% biomass) 2.0 - 2.8% 2.2 - 2.86%
EPA content (% total Fatty Acids) 17 - 21% 20 - 22%
Total Fatty Acid (% biomass) 12 - 14% 11 - 13%
Max biomass productivity (g L-1
day-1)0.198 0.433
Ash, 11.69%
Protein, 32.60%
Fat, 21.45%
Carbohydrates, 34.26%
M. subterraneus in ACCORDIONProximate Analysis
Faster growth in Accordion
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Authors PhotobioreactorVolume
(L)
Biomass Productivity /Area (g m-2
d-1)Kuwahara et al.
(2013)Accordion 35 73.0
Lu et al. (2002) Helical 75 64.5
Lu et al. (2002) Bubble Column 57 35.8
Hu et al. (1996) Flat Plate 25 36.2
Hu et al (1997) Flat Plate 14 38.1
Vonshak et al. (2001)
Horizontal Tubular
140 9.5
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0
0.5
1
1.5
2
0 50 100 150 200 250
Cel
l Den
sity
(d d
ry b
iom
ass
-L-1
reac
tor)
Time (hours)
1.64
0.88
1.64 1.64 1.64 1.64
0.88 0.88 0.88
Objectives Achieved:
High tolerance to CO2, up to 25% CO2 concentration and greater High productivity, up to 0.4 g biomass L-1 day-1 (= 8mg EPA L-1 day-1) Semi-continuous production for 3 weeks with negligible level of contamination Determined:
Positive dependence on CO2 level (in the range of 5 – 25%CO2). Low dependence on light and nutrient level (in the range of 100 – 350 µmol m-2
s-1 in PAR). Low shear stress (with pump flow rate less than 5 L min-1). Positive dependence on starting cell concentration (recommended initial cell concentration of 0.1-0.2 g L-1).
Time = 0 hours Time =192 hours
Reactor volume: 30 LHarvesting volume: 14 L per reactorHarvesting biomass: 23 g per reactorProductivity: 0.38 g biomass L-1 reactor volume day-1
(= 11.4 g biomass per reactor per day)EPA productivity: 9.5 mg EPA L-1 reactor volume day-1
(= 285 mg EPA per reactor per day)
Harvested – 14L = 23g dry biomass
Reactor Volume: 30L
14L = 23g dry biomass 14L = 23g dry biomass 14L = 23g dry biomass 14L = 23g dry biomass
Growth of M. subterraneus in ACCORDION(still to be optimized)
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0
0.2
0.4
0.6
0.8
1
1.2
0 50 100 150 200 250 300
Dry
cel
l wei
ght (
g L-
1)
Time (h)
Monodus subterraneous in ACCORDION: Carbon Dioxide Tolerance Study
Greenhouse Laboratory
5% CO2 100% CO2
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Heterotrophic Production of C. cohnii in ACCORDION
DHA Content (% biomass) 1.3-2.2%
DHA Content (% total FattyAcids)
21.5-24.6%
Total Fatty Acid (% biomass) 6.0-9.0%
Max biomass productivity (g L-1
day-1)7.70
DHA content and Growth of C. cohnii
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Microalgae Production Pathway 2
Species/Strain Selection
Mass Production
Harvesting
Dewatering
Product Extraction
Conversion
WaterNutrientsMinimal water losses
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Innovative Strategy 3
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Innovative Strategy 3: Cyanotech, U.S.A.
Hybrid PBR and Open-Raceway Production
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Innovative Strategy 3: Cyanotech, U.S.A.
Hybrid PBR and Open-Raceway Production
PBRs
Last 2 weeks of production only
Open Raceways
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Microalgae Production Pathway 3
Species/Strain Selection
Mass Production
Harvesting
Dewatering
Product Extraction
Conversion
Reduced Water Losses
WaterNutrients
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Algae for Biofuels andOther Products
Require:
Techno-economic Feasibility
AND
Environmental Sustainability
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SAUDI ARABIA
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Accordion at University of Agder
Riyadh, Saudi Arabia
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Accordion at University of Agder
King Abdulaziz City forScience and Technology (KACST)
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Accordion at University of AgderKing Abdulaziz City forScience and Technology (KACST)
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Algae as Feed:
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QATAR
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Inland Fish Aquaculture Livestock
AlgaePhotobioreactors
AlgaePhotobioreactors
SolarElectricity
Nutrients & Water
RecoveredNutrients and
Water
Waste Treatment Feed
CO2
Biogas
Qatar Integrated Demonstration Farm
Prof. Joel L. CuelloThe University of Arizona
Nutrients & WaterWater Water
Algae Biomass for Use as Feed or Feed Ingredients
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Chile
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Universidad de Magallanes
Harnessing algae from Patagonia andAntarctica for biofuels and other high-valueproducts
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Acknowledgments
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Acknowledgments
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Roald A. Flo, Ph.D.Managing Director PhD
Biopharmia, LLCOslo, Norway
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