mheslep
Gold Member
- 362
- 719
Yes I've been following some of the efforts: inorganic w/ Lewis (CalTech) and Nocera (MIT); biologic w/ Joule Unlimited and Venter. Lewis has already identified materials efficient and cheap but not robust to the corrosive environment of hydrolysis. Nature deals w/ the same problem by continually rebuilding the photoplasts, if at some energy cost.
For this reason I favor the biologic solution from Joule w/ its direct hydrocarbon engineered organism. Their approach eliminates the harvest and lipid conversion step (direct conversion), eliminates the 'gunk' build up associated with algae that has crashed some prototype systems, eliminates biomass feed stock transport problems, eliminates the fresh water resource problem (at least 19 mbbl/day) associated with all other biofuel efforts. Joule claims they can do 20,000 gallons/acre-year of hydrocarbon in a peer reviewed journal. They rely on bio-solar enclosures which has proved too expensive in the past, so they have that hill to climb.* If they succeed, then 7 million acres replaces all US oil imports, 15 million replaces all US oil period. That's a fraction of the land dedicated to just US corn ethanol in 2011.
*For instance, if the cost target is $2/gal, then they have to build an acre of enclosures, operate, and pay land taxes off $40,000/acre/year. If the cost of the enclosure is only $2/sq ft then an acre of enclosure costs $86K. Of course farmers make a living off $1000/acre/year, but they don't have to cover the dirt with plexiglass.
PS: The above is, I think, the best approach for liquid fuels. I still favor electrified, battery based, transportation over combustion and its inevitable byproducts whenever possible.
For this reason I favor the biologic solution from Joule w/ its direct hydrocarbon engineered organism. Their approach eliminates the harvest and lipid conversion step (direct conversion), eliminates the 'gunk' build up associated with algae that has crashed some prototype systems, eliminates biomass feed stock transport problems, eliminates the fresh water resource problem (at least 19 mbbl/day) associated with all other biofuel efforts. Joule claims they can do 20,000 gallons/acre-year of hydrocarbon in a peer reviewed journal. They rely on bio-solar enclosures which has proved too expensive in the past, so they have that hill to climb.* If they succeed, then 7 million acres replaces all US oil imports, 15 million replaces all US oil period. That's a fraction of the land dedicated to just US corn ethanol in 2011.
*For instance, if the cost target is $2/gal, then they have to build an acre of enclosures, operate, and pay land taxes off $40,000/acre/year. If the cost of the enclosure is only $2/sq ft then an acre of enclosure costs $86K. Of course farmers make a living off $1000/acre/year, but they don't have to cover the dirt with plexiglass.
PS: The above is, I think, the best approach for liquid fuels. I still favor electrified, battery based, transportation over combustion and its inevitable byproducts whenever possible.
Last edited: