22 ms·

Bacteria converts carbon dioxide into liquid fuel

77 points by rbii 15y ago

JoeAltmaier 15y ago
tl;dr:carbon-neutral conversion of CO2 to fuel and back again. Essentially a chemical battery.
- mrsebastian 15y ago
  Well, liquid fuel, not chemical -- and its power isn't a function of the size of its electrodes. More like a 'liquid fuel energy storage device', I guess.
DanBC 15y ago
(http://www1.cnsi.ucla.edu/news/item?item_id=2046567 http://www1.cnsi.ucla.edu/news/item?item_id=2046567) {There have been quite a few extremetech articles recently. Any estimate of how much money they're making from the ads?} EDIT: Thanks debacle!
- debacle 15y ago
  Your link has a bit of trailing gunk: http://www1.cnsi.ucla.edu/news/item?item_id=2046567 http://www1.cnsi.ucla.edu/news/item?item_id=2046567
mchannon 15y ago
What's wonderful about the two butanols they are making is that they are near drop-in replacements for gasoline. If this scales up, this would make an excellent alternative to expensive fuel deliveries for isolated places. Yet another encouraging bridge between the grid and the internal combustion engine.
crewtide 15y ago
Not only a nifty idea for fuel, but a way to deal with our ant overpopulation! As with other biofuels, it may have the downside of increasing the price of formic acid as a foodstuff. And if you've never tried ants over shoe-string potatoes, you should -- they add a delicious, lemony flavor! Just remember to check your teeth for ant-legs after dinner. :)
- mrsebastian 15y ago
  Reminds me of a TED talk[0], about how we'll probably have to eat a lot of lower-trophic-level food in the next few decades, as the population of Earth increases -- stuff like crickets, and other insects. [0] http://www.ted.com/talks/marcel_dicke_why_not_eat_insects.html http://www.ted.com/talks/marcel_dicke_why_not_eat_insects.ht...
uvdiv 15y ago
Unfortunately The Paper [1] is closed source. I can't find much information; no comparison with existing, chemical synfuels processes (like methanol via syngas [CO]). There's a serious problem with the general idea: "clean" CO2 is hard to get. You can get concentrated (>10%) CO2 streams from a power plant, which could work for synfuels, but ultimately that's still transferring fossil carbon into the air (if more efficiently). The "nice" idea is to capture CO2 from the atmosphere (I think they are implying this?); this gives you a carbon-neutral cycle (CO2 => fuel => CO2). This is difficult because CO2 in the air is so dilute -- 0.04% vol., or 0.8 grams/meter^3. Can you get CO2 from the air? There's research in this; the APS assessment [2] thinks it could be done at around $600-800/tCO2, which translates to e.g. $7/gallon gas equivalent of methanol, just for the carbon. The process uses an inorganic base (NaOH) to scrub CO2, so maybe you'd think you could genetically-engineer superbacteria to do better. But the absorbent is not the bottleneck -- it's the extreme volume and flow of air that needs to be brought to the absorbent, over an insanely large surface area. The scale is visualized in [2] figure 1.2 (http://i.imgur.com/Y0D2f.png http://i.imgur.com/Y0D2f.png): a very small, 10^6 ton CO2/year capture plant is designed as a 1km * 1km grid of rows of giant, sucking fans. And the NaOH process isn't particularly inefficient -- it captures 50% of the CO2 in air. Some more about atmosperic CO2 capture from David Keith [3] and his startup [4]; this was featured in the Economist this month [5]. Wikipedia is a starting point for synfuels in general [6]; George Olah advocates a methanol/dimethyl ether economy using CO2 recycled from air [7]. [1] http://www.sciencemag.org/content/335/6076/1596.abstract http://www.sciencemag.org/content/335/6076/1596.abstract [2] http://www.aps.org/about/pressreleases/dac11.cfm http://www.aps.org/about/pressreleases/dac11.cfm [3] http://www.keith.seas.harvard.edu/AirCapture.html http://www.keith.seas.harvard.edu/AirCapture.html [4] http://www.carbonengineering.com/ http://www.carbonengineering.com/ [5] http://www.economist.com/node/21550241 http://www.economist.com/node/21550241 [6] http://en.wikipedia.org/wiki/Synthetic_fuel http://en.wikipedia.org/wiki/Synthetic_fuel [7] http://wiki.ornl.gov/sites/carboncapture/Shared%20Documents/Background%20Materials/Alternative%20Methods/G.%20Olah.pdf http://wiki.ornl.gov/sites/carboncapture/Shared%20Documents/...
- mrsebastian 15y ago
  Wow, awesome insight -- thanks. I'll put a link to your comment in the original story :)
ScottBurson 15y ago
In short, it sounds like you could have a car with solar panels on the roof, and they could drive the creation of liquid fuel that could then be used to power the car’s engine. Sure. Leave your car in the sun for a week and you can drive it three miles. People need to get how diffuse solar energy is. (Oh, and could someone fix the title? "Bacteria" is plural.)
- mchannon 15y ago
  Good point, but it does end up depending on the vehicle. A 6 m^2 15% efficient array parked outside in a desert climate could generate 5.4kWh a day and over 37kWh a week. GM's EV-1 had efficiencies of over 6mi/kWh. As such, a vehicle could be built that could go 32 miles a day off sunlight alone, using ho-hum $1/W solar cells and without any tracking. Of course, at that point, you don't need to futz with bacteria and internal combustion, when batteries store and release that energy much more efficiently.
  - ScottBurson 15y ago
    32 miles a day... in Arizona... in a car 80% of whose upper surface area is solar cells, leaving little room to see out. I can imagine some enthusiast building one, but I don't think it's a mass-market product. None of this, I hasten to add, is to impugn the idea of using bacteria to fix CO2. It's just that the idea of doing it in your car, driven by solar cells on the roof, is silly. The numbers just don't pencil out. (And as you point out, it's doubly silly since you would use batteries anyway.)
- ScottBurson 15y ago
  Okay downvoters, let's run the numbers. Suppose you have about 1 square meter of solar cells on the roof of your car. From Wikipedia, a typical solar PV installation in the US or Europe gets 1kWh/sqm/day (depending on latitude, of course). How far will 1kWh take you? Let's see, gasoline contains about 37 kWh/gal (US), which at 40mpg is a little over 1 mile/kWh. So if your electricity-to-fuel conversion process is 50% efficient, you'll get about half a mile on a day's charge.
- WiseWeasel 15y ago
achy 15y ago
Or, you know, you could just use the electricity to convert water to hydrogen (itself a usable fuel). How much of the energy required for this reaction is actually coming from the carbon / atmosphere? I would guess very little.
- mchannon 15y ago
  The thing is that hydrogen has very limited utility as a fuel. Compressing it is as energy-intensive as producing it in the first place, and even compressed, it takes up a very large amount of volume. A pressure vessel identical in volume to a standard 15gal gas tank would hold less than 2.5 gge (gasoline gallon equivalents) of 700bar compressed hydrogen. There are all sorts of storage media under development to get around this hydrogen volumetric density problem, but none are much closer to market than this butanol project. At the very least, an existing vehicle fleet would require significant engine modifications to run on hydrogen (not to mention fuel storage and delivery system modifications).
sitkack 15y ago
Can I get infected with this bacteria? If I get it in my lungs will it poison me with biofuel?
- WiseWeasel 15y ago
  I have never heard of this organism as a human pathogen in my bacterial pathology classes, so it's at least not a common one. My guess is if it likes a liquid environment rich in formic acid, it might be more at home in your gut than in your lungs, but it would likely be out-competed by your existing intestinal flora, unless maybe you just killed them all off with an antibiotic regimen or some-such.
droithomme 15y ago
What could possibly go wrong. edit: since I am being downvoted, I will state it explicitly. We are creating a simple, resiliant lifeform that grows and reproduces as long as it can eat carbon dioxide, of which there are essentially unlimited supplies on earth. We know from observing complex fragile invasive species that are brought in to new environments with unlimited food and no controls on growth what happens. They reproduce and grow until they run out of their food source. For example, bringing cats to australia to control rodents. Releasing this bacteria, which is neither complex nor fragile, into the wild has a reasonable chance of consuming vast amounts of CO2, producing petrochemicals as a waste product. The easily predictable outcome of this release is the elimination of nearly all life on the planet and creation of a toxic atmosphere similar to that on Titan.
- Dylan16807 15y ago
  What makes you think it's resilient? And it doesn't feed on CO2, it feeds on electricity. You do not find supplies of electricity sitting around in the wild.

77 points by rbii 15y ago

JoeAltmaier 15y ago

tl;dr:carbon-neutral conversion of CO2 to fuel and back again. Essentially a chemical battery.

mrsebastian 15y ago
Well, liquid fuel, not chemical -- and its power isn't a function of the size of its electrodes. More like a 'liquid fuel energy storage device', I guess.

DanBC 15y ago

(http://www1.cnsi.ucla.edu/news/item?item_id=2046567 http://www1.cnsi.ucla.edu/news/item?item_id=2046567) {There have been quite a few extremetech articles recently. Any estimate of how much money they're making from the ads?} EDIT: Thanks debacle!

debacle 15y ago
Your link has a bit of trailing gunk: http://www1.cnsi.ucla.edu/news/item?item_id=2046567 http://www1.cnsi.ucla.edu/news/item?item_id=2046567

mchannon 15y ago

What's wonderful about the two butanols they are making is that they are near drop-in replacements for gasoline. If this scales up, this would make an excellent alternative to expensive fuel deliveries for isolated places. Yet another encouraging bridge between the grid and the internal combustion engine.

crewtide 15y ago

Not only a nifty idea for fuel, but a way to deal with our ant overpopulation! As with other biofuels, it may have the downside of increasing the price of formic acid as a foodstuff. And if you've never tried ants over shoe-string potatoes, you should -- they add a delicious, lemony flavor! Just remember to check your teeth for ant-legs after dinner. :)

mrsebastian 15y ago
Reminds me of a TED talk[0], about how we'll probably have to eat a lot of lower-trophic-level food in the next few decades, as the population of Earth increases -- stuff like crickets, and other insects. [0] http://www.ted.com/talks/marcel_dicke_why_not_eat_insects.html http://www.ted.com/talks/marcel_dicke_why_not_eat_insects.ht...

uvdiv 15y ago

Unfortunately The Paper [1] is closed source. I can't find much information; no comparison with existing, chemical synfuels processes (like methanol via syngas [CO]). There's a serious problem with the general idea: "clean" CO2 is hard to get. You can get concentrated (>10%) CO2 streams from a power plant, which could work for synfuels, but ultimately that's still transferring fossil carbon into the air (if more efficiently). The "nice" idea is to capture CO2 from the atmosphere (I think they are implying this?); this gives you a carbon-neutral cycle (CO2 => fuel => CO2). This is difficult because CO2 in the air is so dilute -- 0.04% vol., or 0.8 grams/meter^3. Can you get CO2 from the air? There's research in this; the APS assessment [2] thinks it could be done at around $600-800/tCO2, which translates to e.g. $7/gallon gas equivalent of methanol, just for the carbon. The process uses an inorganic base (NaOH) to scrub CO2, so maybe you'd think you could genetically-engineer superbacteria to do better. But the absorbent is not the bottleneck -- it's the extreme volume and flow of air that needs to be brought to the absorbent, over an insanely large surface area. The scale is visualized in [2] figure 1.2 (http://i.imgur.com/Y0D2f.png http://i.imgur.com/Y0D2f.png): a very small, 10^6 ton CO2/year capture plant is designed as a 1km * 1km grid of rows of giant, sucking fans. And the NaOH process isn't particularly inefficient -- it captures 50% of the CO2 in air. Some more about atmosperic CO2 capture from David Keith [3] and his startup [4]; this was featured in the Economist this month [5]. Wikipedia is a starting point for synfuels in general [6]; George Olah advocates a methanol/dimethyl ether economy using CO2 recycled from air [7]. [1] http://www.sciencemag.org/content/335/6076/1596.abstract http://www.sciencemag.org/content/335/6076/1596.abstract [2] http://www.aps.org/about/pressreleases/dac11.cfm http://www.aps.org/about/pressreleases/dac11.cfm [3] http://www.keith.seas.harvard.edu/AirCapture.html http://www.keith.seas.harvard.edu/AirCapture.html [4] http://www.carbonengineering.com/ http://www.carbonengineering.com/ [5] http://www.economist.com/node/21550241 http://www.economist.com/node/21550241 [6] http://en.wikipedia.org/wiki/Synthetic_fuel http://en.wikipedia.org/wiki/Synthetic_fuel [7] http://wiki.ornl.gov/sites/carboncapture/Shared%20Documents/Background%20Materials/Alternative%20Methods/G.%20Olah.pdf http://wiki.ornl.gov/sites/carboncapture/Shared%20Documents/...

mrsebastian 15y ago
Wow, awesome insight -- thanks. I'll put a link to your comment in the original story :)

ScottBurson 15y ago

In short, it sounds like you could have a car with solar panels on the roof, and they could drive the creation of liquid fuel that could then be used to power the car’s engine. Sure. Leave your car in the sun for a week and you can drive it three miles. People need to get how diffuse solar energy is. (Oh, and could someone fix the title? "Bacteria" is plural.)

mchannon 15y ago
Good point, but it does end up depending on the vehicle. A 6 m^2 15% efficient array parked outside in a desert climate could generate 5.4kWh a day and over 37kWh a week. GM's EV-1 had efficiencies of over 6mi/kWh. As such, a vehicle could be built that could go 32 miles a day off sunlight alone, using ho-hum $1/W solar cells and without any tracking. Of course, at that point, you don't need to futz with bacteria and internal combustion, when batteries store and release that energy much more efficiently.
- ScottBurson 15y ago
  32 miles a day... in Arizona... in a car 80% of whose upper surface area is solar cells, leaving little room to see out. I can imagine some enthusiast building one, but I don't think it's a mass-market product. None of this, I hasten to add, is to impugn the idea of using bacteria to fix CO2. It's just that the idea of doing it in your car, driven by solar cells on the roof, is silly. The numbers just don't pencil out. (And as you point out, it's doubly silly since you would use batteries anyway.)
ScottBurson 15y ago
Okay downvoters, let's run the numbers. Suppose you have about 1 square meter of solar cells on the roof of your car. From Wikipedia, a typical solar PV installation in the US or Europe gets 1kWh/sqm/day (depending on latitude, of course). How far will 1kWh take you? Let's see, gasoline contains about 37 kWh/gal (US), which at 40mpg is a little over 1 mile/kWh. So if your electricity-to-fuel conversion process is 50% efficient, you'll get about half a mile on a day's charge.
WiseWeasel 15y ago

achy 15y ago

Or, you know, you could just use the electricity to convert water to hydrogen (itself a usable fuel). How much of the energy required for this reaction is actually coming from the carbon / atmosphere? I would guess very little.

mchannon 15y ago
The thing is that hydrogen has very limited utility as a fuel. Compressing it is as energy-intensive as producing it in the first place, and even compressed, it takes up a very large amount of volume. A pressure vessel identical in volume to a standard 15gal gas tank would hold less than 2.5 gge (gasoline gallon equivalents) of 700bar compressed hydrogen. There are all sorts of storage media under development to get around this hydrogen volumetric density problem, but none are much closer to market than this butanol project. At the very least, an existing vehicle fleet would require significant engine modifications to run on hydrogen (not to mention fuel storage and delivery system modifications).

sitkack 15y ago

Can I get infected with this bacteria? If I get it in my lungs will it poison me with biofuel?

WiseWeasel 15y ago
I have never heard of this organism as a human pathogen in my bacterial pathology classes, so it's at least not a common one. My guess is if it likes a liquid environment rich in formic acid, it might be more at home in your gut than in your lungs, but it would likely be out-competed by your existing intestinal flora, unless maybe you just killed them all off with an antibiotic regimen or some-such.

droithomme 15y ago

What could possibly go wrong. edit: since I am being downvoted, I will state it explicitly. We are creating a simple, resiliant lifeform that grows and reproduces as long as it can eat carbon dioxide, of which there are essentially unlimited supplies on earth. We know from observing complex fragile invasive species that are brought in to new environments with unlimited food and no controls on growth what happens. They reproduce and grow until they run out of their food source. For example, bringing cats to australia to control rodents. Releasing this bacteria, which is neither complex nor fragile, into the wild has a reasonable chance of consuming vast amounts of CO2, producing petrochemicals as a waste product. The easily predictable outcome of this release is the elimination of nearly all life on the planet and creation of a toxic atmosphere similar to that on Titan.

Dylan16807 15y ago
What makes you think it's resilient? And it doesn't feed on CO2, it feeds on electricity. You do not find supplies of electricity sitting around in the wild.