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Sustainable Pathways for Algal Bioenergy
LCA of microcalgae culture in a 
recirculating aquaculture system for 
bioremediation 
18.9.14 
Franziska Kugler 
Sustainable Pathways ffoorr AAllggaall BBiiooeenneerrggyy
Content 
Background: system 
Methods: data acquisition, boundaries, 
assumptions 
Selected results of LCA modelling 
Discussion 
Outlook 
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 
Sustainable Pathways for Algal Bioenergy
Background 
Sustainable Pathways for Algal Bioenergy 
Inoculum 
production 
Microalgae 
cultivation 
Biogas 
production 
Harvesting : 
Microfiltration 
1 MJ of biogas 
Energy, 
Materials 
Energy, 
Materials 
Energy, 
Materials 
Energy, 
Materials
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 
Sustainable Pathways for Algal Bioenergy
Methods 
Sustainable Pathways for Algal Bioenergy 
Data from pilot partner 
– Inoculum production 
– Cultivation 
assumed data from own calculations (referring 
to model of Johannes Weiss, 2009) 
– Harvesting/drying: microfiltration 
– Biogas production
Methods 
environmental LCA 
software: Umberto (ifu Hamburg) 
database: ecoinvent 2.2 
Impact assessment method: “Recipe” 
Sustainable Pathways for Algal Bioenergy
Results 
Sustainable Pathways for Algal Bioenergy
Results 
Sustainable Pathways for Algal Bioenergy 
Microalgae 
cultivation 
Product 1MJ 
biogas
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 
Sustainable Pathways for Algal Bioenergy
Results 
Sustainable Pathways for Algal Bioenergy 
Microalgae 
cultivation 
Product 1MJ 
biogas
deviation from natural gas in orders of magnitude 
-3 -2 -1 0 1 2 3 4 5 6 7 
Sustainable Pathways for Algal Bioenergy 
water depletion, WDP 
urban land occupation, ULOP 
terrestrial ecotoxicity, TETPinf 
terrestrial acidification, TAP100 
photochemical oxidant formation, POFP 
particulate matter formation, PMFP 
ozone depletion, ODPinf 
natural land transformation, NLTP 
metal depletion, MDP 
marine eutrophication, MEP 
marine ecotoxicity, METPinf 
ionising radiation, IRP_HE 
human toxicity, HTPinf 
freshwater eutrophication, FEP 
freshwater ecotoxicity, FETPinf 
fossil depletion, FDP 
climate change, GWP100 
agricultural land occupation 
biogas ecoinvent/ natural gas biogas (algae) 1/15 electricity /natural gas biogas (algae) /natural gas
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 
Sustainable Pathways for Algal Bioenergy
Outlook 
LCA for other applications than energy, like fish feed 
Adaption and optimization of Inputs in LCA 
Upscaling approaches? 
Sustainable Pathways for Algal Bioenergy 
Reasonable assumptions
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
Sustainable Pathways for Algal Bioenergy 
Thanks for your attention!
Sustainable Pathways for Algal Bioenergy

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Session 2 15h45 kugler_kit

  • 1. Sustainable Pathways for Algal Bioenergy
  • 2. LCA of microcalgae culture in a recirculating aquaculture system for bioremediation 18.9.14 Franziska Kugler Sustainable Pathways ffoorr AAllggaall BBiiooeenneerrggyy
  • 3. Content Background: system Methods: data acquisition, boundaries, assumptions Selected results of LCA modelling Discussion Outlook Sustainable Pathways for Algal Bioenergy
  • 4. Background Approach: Recirculation aquaculture system BUT no process integration of algae production, yet Modelling of “stand alone” microalgae production goal: energy application Sustainable Pathways for Algal Bioenergy
  • 5. Background Sustainable Pathways for Algal Bioenergy Inoculum production Microalgae cultivation Biogas production Harvesting : Microfiltration 1 MJ of biogas Energy, Materials Energy, Materials Energy, Materials Energy, Materials
  • 6. 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 Sustainable Pathways for Algal Bioenergy
  • 7. Methods Sustainable Pathways for Algal Bioenergy Data from pilot partner – Inoculum production – Cultivation assumed data from own calculations (referring to model of Johannes Weiss, 2009) – Harvesting/drying: microfiltration – Biogas production
  • 8. Methods environmental LCA software: Umberto (ifu Hamburg) database: ecoinvent 2.2 Impact assessment method: “Recipe” Sustainable Pathways for Algal Bioenergy
  • 9. Results Sustainable Pathways for Algal Bioenergy
  • 10. Results Sustainable Pathways for Algal Bioenergy Microalgae cultivation Product 1MJ biogas
  • 11. 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 Sustainable Pathways for Algal Bioenergy
  • 12. Results Sustainable Pathways for Algal Bioenergy Microalgae cultivation Product 1MJ biogas
  • 13. deviation from natural gas in orders of magnitude -3 -2 -1 0 1 2 3 4 5 6 7 Sustainable Pathways for Algal Bioenergy water depletion, WDP urban land occupation, ULOP terrestrial ecotoxicity, TETPinf terrestrial acidification, TAP100 photochemical oxidant formation, POFP particulate matter formation, PMFP ozone depletion, ODPinf natural land transformation, NLTP metal depletion, MDP marine eutrophication, MEP marine ecotoxicity, METPinf ionising radiation, IRP_HE human toxicity, HTPinf freshwater eutrophication, FEP freshwater ecotoxicity, FETPinf fossil depletion, FDP climate change, GWP100 agricultural land occupation biogas ecoinvent/ natural gas biogas (algae) 1/15 electricity /natural gas biogas (algae) /natural gas
  • 14. 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 Sustainable Pathways for Algal Bioenergy
  • 15. Outlook LCA for other applications than energy, like fish feed Adaption and optimization of Inputs in LCA Upscaling approaches? Sustainable Pathways for Algal Bioenergy Reasonable assumptions
  • 16. 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
  • 17. Sustainable Pathways for Algal Bioenergy Thanks for your attention!
  • 18. Sustainable Pathways for Algal Bioenergy