Session 2 15h45 kugler_kit
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Transcript of Session 2 15h45 kugler_kit
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Sustainable Pathways for Algal Bioenergy
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Sustainable Pathways for Algal BioenergySustainable Pathways for Algal Bioenergy
LCA of microcalgae culture in a
recirculating aquaculture system for
bioremediation
18.9.14
Franziska Kugler
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Sustainable Pathways for Algal Bioenergy
Content
Background: system
Methods: data acquisition, boundaries,
assumptions
Selected results of LCA modelling
Discussion
Outlook
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Sustainable Pathways for Algal Bioenergy
Background
Approach: Recirculation aquaculture system
BUT no process integration of algae
production, yet
Modelling of “stand alone” microalgae
production
goal: energy application
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Sustainable Pathways for Algal Bioenergy
Background
Inoculum
production
Microalgae
cultivation
Biogas
productionHarvesting :
Microfiltration
1 MJ of biogas
Energy,
Materials
Energy,
Materials
Energy,
Materials
Energy,
Materials
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Sustainable Pathways for Algal Bioenergy
Methods
Data aquisition via Excel questionnaire
Visit of the pilot + interviews
Where data was not available � assumptions
Own calculations based on model by Johannes
Weiss
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Sustainable Pathways for Algal Bioenergy
Methods
Data from pilot partner
– Inoculum production
– Cultivation
assumed data from own calculations (referring
to model of Johannes Weiss, 2009)
– Harvesting/drying: microfiltration
– Biogas production
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Sustainable Pathways for Algal Bioenergy
Methods
environmental LCA
software: Umberto (ifu Hamburg)
database: ecoinvent 2.2
Impact assessment method: “Recipe”
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Sustainable Pathways for Algal Bioenergy
Results
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Sustainable Pathways for Algal Bioenergy
Results
Microalgae
cultivation
Product 1MJ
biogas
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Sustainable Pathways for Algal Bioenergy
Comparison to economic modell
Energy consumption during cultivation:
air sparging 96.0 kWh/m3, month
circulation 200.0 kWh/m3, month
heating 0.7 kWh/m3, month
296.7 kWh/m3,month
air gassing 2100.0 kWh/m3, month
pumping 2300.0 kWh/m3, month
4400.0 kWh/m3, month
1/15 of electricity in cultivation used
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Sustainable Pathways for Algal Bioenergy
Results
Microalgae
cultivation
Product 1MJ
biogas
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Sustainable Pathways for Algal Bioenergy
-3 -2 -1 0 1 2 3 4 5 6 7
agricultural land occupation
climate change, GWP100
fossil depletion, FDP
freshwater ecotoxicity, FETPinf
freshwater eutrophication, FEP
human toxicity, HTPinf
ionising radiation, IRP_HE
marine ecotoxicity, METPinf
marine eutrophication, MEP
metal depletion, MDP
natural land transformation, NLTP
ozone depletion, ODPinf
particulate matter formation, PMFP
photochemical oxidant formation, POFP
terrestrial acidification, TAP100
terrestrial ecotoxicity, TETPinf
urban land occupation, ULOP
water depletion, WDP
deviation from natural gas in orders of magnitude
biogas ecoinvent/ natural gas biogas (algae) 1/15 electricity /natural gas biogas (algae) /natural gas
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Sustainable Pathways for Algal Bioenergy
discussion
Energy consumption during cultivation responsible
for bad LCA performance
Other impacts than from energy hidden
Optimization towards energy savings crucial
Higher biomass yields should be achieved
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Sustainable Pathways for Algal Bioenergy
Outlook
LCA for other applications than energy, like fish feed
Adaption and optimization of Inputs in LCA
Upscaling approaches?
�Reasonable assumptions
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Sustainable Pathways for Algal Bioenergy
references
Pictures:
- www.igb.fraunhofer.de/en/competences/environmental-biotechnology/microalgae/photobioreactor.html
- www.chempuretech.com/renewable-energy-algae-photo-bioreactors.html
- www.orangesci.com/pageview.asp?structureID=331
- http://cdn.heizungsfinder.de/images/biogasanlage/vorgrube-biogasanlage.jpg
Data:
- Anneliese Ernst (HTWdS)
- Johannes Weiss: Algae production modell
- Chris de Visser: economic modell on tubular PBRs
- Collet, P., Hélias, A., Lardon, L., Ras, M., Goy, R.-A., Steyer, J.-P. (2010): Life-cycle assessment of microalgae
culture coupled to biogas production. Bioresource Technology 102 (2011) 207-214
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Sustainable Pathways for Algal Bioenergy
Thanks for your attention!
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Sustainable Pathways for Algal Bioenergy