algal biofuels - university of greenwichgala.gre.ac.uk/15750/1/15750_milledge_algal...
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The Oil, Finance & Shipping Symposium31st August 2016, University Of Greenwich at Medway
Algal biofuelsDr John J MilledgeAlgal Biotechnology Research Group, University of Greenwich
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Climate Change: “The overwhelming majority of scientists agree that the rising concentrations of heat-trapping greenhouse gases in the atmosphere caused by human activities”The Met Office
Carbon Dioxide levels are Increasing and global temperatures are rising
NASA Climate Resources
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UK Policy on increasing the use of low-carbon technologies
• 80% reduction in greenhouse gas emissions by 2050.
• 15% of the UK’s energy demand from renewable sources by 2020
https://www.gov.uk/government/policies/increasing-the-use-of-low-carbon-technologies
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Regulations are driving search for cleaner fuels
• UN’s International Maritime Organisation -Sulphur oxides (SOx) – Regulation 14
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Wind, solar and hydro together generated 15% of Britain's electrical demand in 2015.
Based on DECC data
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UK Renewable energy fuel use 2015
Digest of United Kingdom energy statistics (DUKES)
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There is a continuing demand for fluid fuels
Heavy HaulageMarine Transport
Aviation
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Targets for biofuel energy content in transport fuels
•2005 - 2%•2020 - 10% ???????????
Only Sweden and Germany met the 2005 target
The EU Renewable Energy Directive (RED)
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UK Petrol, Diesel & Jet fuel usage
DECC 2016
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Sources of biomass and biofuelsBIOMASS
Oil cropse.g. rape, sunflower,
palm
Sugar cropse.g. cane, beet,
sorghum
Woody biomass
Starch cropse.g. wheat, maize,
potato
Algae
Waste biomasse.g. BMW, food waste, animal slurries, sewage
sludge
Herbaceous biomasse.g. switchgrass
BIOFUEL PROCESSES
Anaerobic digestion or fermentation
Transesterification
Ethanol fermentation
Pyrolysis
Gasification
Biorefining
Butanol fermentation
Combustion
BIOFUELS
Biodiesel
Bioenthanol
Biogas
Biomethane
Biohydrogen
Wood
Biobutanol
Methanol
Syngas
Glycerol
Hydrothermal
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Feedstocks for UK Liquid biofuels
UK biodiesel mainly from Waste Cooking Oil and Tullow
DECC and UKPIA
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Gallagher Report (2008) - EU target of 10% of transport fuel used by 2020s unlikely to be met sustainably.
The Gallagher Review of the indirect effects of biofuels production, Renewable Fuels Agency , 2008 .http://webarchive.nationalarchives.gov.uk/20110407094507/renewablefuelsagency.gov.uk/reportsandpublications/reviewoftheindirecteffects
ofbiofuels
How “Green” is Biodiesel?
Directive (EU) 2015/1513
Max 7% contribution by biofuels from 'food' crops
Emphasis on biofuel from:Waste feedstocks Advanced biofuels
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Sources of biomass and biofuelsBIOMASS
Oil cropse.g. rape, sunflower,
palm
Sugar cropse.g. cane, beet,
sorghum
Woody biomass
Starch cropse.g. wheat, maize,
potato
Algae
Waste biomasse.g. BMW, food waste, animal slurries, sewage
sludge
Herbaceous biomasse.g. switchgrass
BIOFUEL PROCESSES
Anaerobic digestion or fermentation
Transesterification
Ethanol fermentation
Pyrolysis
Gasification
Biorefining
Butanol fermentation
Combustion
BIOFUELS
Biodiesel
Bioenthanol
Biogas
Biomethane
Biohydrogen
Wood
Biobutanol
Methanol
Syngas
Glycerol
Hydrothermal
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What are Algae?
• Diverse range of aquatic ‘plants’, ranging from unicellular
to multi-cellular forms,
• Generally possess chlorophyll, but are without true
stems and roots.
• Two groups:
macro-algae commonly known as ‘seaweed’
micro-algae, microscopic single cell organisms
Seaweed growing on the Medway Culturing microalgae in flasks
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Why Algae?
• Algae can be cultivated on non-agricultural land or at sea.
• Many species grow in brackish or salt water.
• Potential productivity greater than terrestrial crops
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Microalgae can contain high quantities of lipids (oil)
Nitzschia palea 80%
Botryococcus braunii 75%
Monallantus salina 72%
Chlorella protothecoides 55%
Scenedesmus dimorphus 40%
Prymnesium parvum 38%
Source University of Cape Town
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Microalgal Biodiesel Process
Dilute Algae Conc’ AlgaeGrowthHarvestingconcentration
Drying & Lipid
Extraction
Operational Energy Input
Nutrients RecycledWater &
Nutrients
CO2
Energy Output
O2
TransesterificationLipid
Currently Uneconomic
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Glycerol the byproduct of Biodiesel
• The glycerol 9 -13% of fats and oils
• ~100 kg of Glycerol from 1 ton of oil
Croda Glycerine Market Brief
Triglyceride + Methanol → Biodiesel + Glycerol
• Biodiesel accounted for only 9% of the supply of Glycerol in 1999 but 64% in 2009
Courtesy SRS Engineering Corporation
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Biodiesel is the Main Driver of Glycerol Supply
Quispe CAG, Coronado CJR, Carvalho Jr JA (2013) Glycerol: Production, consumption, prices, characterization and new trends in combustion Renew and Sustain Energy Rev 27:475-493 d
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Glycerol
• Water-soluble
• Non-flammable
• Non-volatile
• High boiling point
• Bio-production
• Bio-degradable
C
C
C
O
O
O
H
H
H
H
H
H
H
H
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Glycerol emissions on combustion
Glycerol
Gas Engine, natural gas
EPA-Tier 4
CO2, g Kwh-1
NO
x, g
Kw
h-1
8
6
4
2
0
0 1 2 3 4
Diesel
Glycerol with catalytic abatement Independently verified
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University of Greenwich has installed a glycerol-fired Combined Heat and Power plant at the Medway Campus
This is the first building retro-fit in the world.
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Glycerol -CHPCombined Heat and Power
410 kW of Electricity
450 kW of Heating
2600 tonnes per annum
Reduction in Carbon Footprint
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Problems
Crude Refined
Quality
Costly to refine crude glycerol
Future Sustainable supply
Limited waste cooking oil
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Dunaliella salina
Microalga
>80% glycerol
Commercially grown
β Carotene >14 %
Salt tolerant
Grows in salt-pans
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Dunaliella Glycerol CHP
Dilute Algae Conc’ Algae
GrowthHarvestingconcentration
Algal Biorefinery
Nutrients Recycled
Water &Nutrients
CO2
Gly
cero
l
Co-products
O2
CHP Power
Operational Energy Input
HeatCO2 Recycling
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Estimate of annual glycerol production
Average Biomass dry matter yield gm-2d-1 16
Glycerol % in dry matter % 80
Days per year operational days 350
annual production 44.8 tonnes ha y-1
annual energy production 850 gJ ha-1
Algal glycerol
palm oil
rape 8,000 hrs operation
1,800 t glycerol yr-1
~40 Hectares
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The D-Factory for glycerolKBBE.2013.3.2 (No: 613870)
1. 10 million Euro FP7-funded project
2. 13 partners from 8 countries – 2 universities
3. Flexibly and sustainably produce suites of compounds and fuel from Dunaliella to meet market requirements.
4. Showcase a sustainable biorefinery: demo - 2017/8
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Macroalgal (Seaweed) Biofuels Research at Greenwich University
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Algal BiofuelsMethod Utilises entire
algal biomassUtilises wet biomass Primary energy
product
Direct combustion ✓ ✕ Heat
Pyrolysis ✓ ✕Primarily liquid by fast pyrolysis
Gasification ✓ ✕ b(conventional) Primarily Gas
Biodiesel production ✕ ✕ c Liquid
Hydrothermal treatments ✓ ✓ Primarily Liquid
Bioethanol production ✕ a ✓ Liquid
Biobutanol production ✕ a ✓ Liquid
Anaerobic digestion ✓ ✓ Gas
a Polysaccharides require hydrolysis to fermentable sugars. Some of the sugars produced from the breakdown of seaweed polysaccharides are not readily fermented; b Supercritical
water gasification (SCWG) an alternative gasification technology can convert high moisture biomass; c No current commercial process for the wet trans-esterification of wet
macroalgal biomass
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Sargassum muticum feedstockSeason Ash C H O N S HHV
% total wt. % dry weightKJ g-1
dw
Spring 29.5 30.7 4.0 29.6 4.9 1.5 16.3Summer 33.3 30.1 4.2 28.1 3.6 0.8 12.0
• High moisture ~85%• High ash• High Sulphur • HHV lower than terrestrial energy
crops
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Maintaining Year Round Supply
• Harvesting is seasonal
• Need to preserve and store for a continuous supply
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Ensilage• Used to store
forage for animal feed
• Naturally-present bacteria
• Lactic acid fermentation under anaerobic conditions
• pH decreases to preserve cop
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Ensiled seaweed composition Moisture C H O N S Ash Salt HHV
% total wt. % dry weight % of ash KJ g-1 dw
Unensiled 85.4 30.1 4.2 28.1 3.6 0.8 33.3 46.1 12.05Ensiled whole 85.5 30.0 4.2 29.3 3.3 <0.1 33.1 43.6 12.13Ensiled chopped 85.2 29.4 3.9 29.8 3.5 <0.1 33.3 45.9 12.36
• No sig difference in CHON, ash and HHV• Ensiling results in a significant reduction in salt• Ensiling results in virtual total loss of organic
sulphur
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Energy Losses due to Ensiling
<8 % original Higher Heating Value
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Effect of Ensilage on CH4 Yield
Methane productionL CH4 g-1 VS
Average StdVUntreated 0.10 0.05Ensiled whole 0.11 0.08Chopped prior to ensiling 0.06 0.01
No statistically significant effect on methane yields
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Acknowledgements• The Engineering and Physical
Sciences Research Council EPSRC EP/K014900/1 – MacroBioCrude
• EU FP7 KBBE.2013.3.2 (No: 613870) D-factory
• High Value Chemicals from Plants
Thank you