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Microbial energy conversion and practical application to an algal fuel cell. Peter Weigele

Department of Biology. Microbial energy conversion and practical application to an algal fuel cell. Peter Weigele MIT Biology and Edgerton Center Presentation for 10.391 Sustainable Energy February 15, 2007. There's no place. ...like home!. http://visibleearth.nasa.gov/.

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Microbial energy conversion and practical application to an algal fuel cell. Peter Weigele

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  1. Department of Biology Microbial energy conversion and practical application to an algal fuel cell. Peter Weigele MIT Biology and Edgerton Center Presentation for 10.391 Sustainable Energy February 15, 2007

  2. There's no place ...like home! http://visibleearth.nasa.gov/

  3. Food and fuel subject to the same market forces? A Culinary and Cultural Staple in Crisis: Mexico Grapples With Soaring Prices for Corn -- and Tortillas By Manuel Roig-Franzia Washington Post Foreign Service Saturday, January 27, 2007; A01 “Mexico is in the grip of the worst tortilla crisis in its modern history. Dramatically rising international corn prices, spurred by demand for the grain-based fuel ethanol, have led to expensive tortillas.” 9 x 109 by 2050

  4. respiration!

  5. Electrons go where they are most wanted...

  6. Aerobic respiration: O2 as terminal electron acceptor “Bacteria are beautiful” by Diane Newman

  7. Anaerobic respiration with Iron(III) as extracellular terminal e- acceptor soluble electron carriers “Bacteria are beautiful” by Diane Newman

  8. see also www.geobacter.org

  9. Protein nanowires also found in gram negative aerobes, cyanobacteria, and methanogens http://www.pnas.org/cgi/doi/10.1073/pnas.0604517103

  10. Schematic of a microbial fuel cell

  11. Sediment battery: a type of microbial fuel cell

  12. Bacterial biomass from electricity

  13. Summary, part I: The microbial fuel cell could be a core technology for energy conversion cellulose-derived carbohydrates energy rich wastewater organic sediments sunlight electricity microbial metabolism ex vivo protein complexes anode/cathode composition electron carriers fuel cell construction MFC electricity hydrogen alcohols methane treated water

  14. Part II: Photosynthesis

  15. NADPH NADP+ ADP + Pi ATP light H+ stroma light 5 3 FNR Fd F1F0 ATP- synthase 1 2 H+ cyt bf complex photo- system I (P700) photo- system II (P680) Light Harvesting Complex (LHCII) Light Harvesting Complex (LHCI) Q OEC thylakoid membrane 4 PC 2 H2O 4 H+ + O2 H+ H+ thylakoid lumen

  16. 1

  17. 2

  18. 3

  19. 4

  20. 5

  21. Part III: A simple, low-cost algal fuel cell for research and education

  22. Chlamydomonas rheinhardtii making colonies on solid medium

  23. Photobioreactors: modular, scalable

  24. Algal growth using an airlift bioreactor Airlift with Gas Dispersion Tube Gas Dispersion Tube Only

  25. PVC insert to create air-lift for improved mixing

  26. PVC tubing + caps + fittings + tubing + pump = gas recirculator

  27. The finished recirculating pump

  28. Gas managment and fuel cell Luer fittings and stopcocks fromCole-Parmer petstore 40 bucks from fuelcellstore.com

  29. Bioreactor setup

  30. Fuel cell under load Photobioreactor Fuel Cell Online Data Monitoring H2 e-

  31. Data collection using an A/D converter Dataq model 154, ~$100, microvolt resolution

  32. Experimental overview algal growth on solid substrate grow algae with bubbling air and S+ medium inoculate large bioreactor containing S- medium seal, start pump, and collect data measure cell mass, and chlorophyll concentration

  33. Do other kinds of green, microalgae make H2? Chlamydomonas rheinhardtii Unknown: “WP2” Unknown: “WP1”

  34. Testing different algal strains (note clumping Chlamy)

  35. Algal strain choice impacts H2 production:As Indicated by Varying Voltage Output data from 10.28 Team C, 2006

  36. data from 10.28 Team C, 2006

  37. 10.28 Team C Sohrab Virk Asish Misra Joia Ramachandani

  38. Sophmore biology students from Nashoba Regional HS Kay Leigh Kay

  39. Andrew Hoy Mackey Craven

  40. Many, many thanks! Nina Kshetry Sam Jewell Tom Knight Jon King Chris Kaiser Samantha Sutton Jason Kelly openwetware.org J.F. Hamel and 10.28 Team C Joia Ramachandani Asish Misra Sohrab Virk David Form, NRHS Ashley, Meaghan, Kay Leigh, Jackie, and Kay Edgerton Center Steven Banzaert Sandi Lipnonski New blood! John M. Craven Andrew Hoy

  41. 6 CO2 + 6 H2O --> C6H12O6

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