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Algae. Why Now? What's Next?

By Mary Rosenthal, Algal Biomass Organization
September 28, 2009   |   13 Comments

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13 Reader Comments
Comment
1 of 13
September 28, 2009
Algae "stores" carbon? I sure hope the large carbon emitters never get away with claiming that algae sequesters carbon. Because that carbon gets right back into the atmosphere the moment the algae gets burned as fuel. Algae recycles the carbon, (which is good) maybe temporarily stores it for a few days or months (which is not very useful), but it does not sequester carbon.
Comment
2 of 13
September 29, 2009
Carolyn has a point, but only partially. That is because, only parts of algae go to making up the hydrocarbon fuels we want to "immediately" release carbon from to extract the energy once again. Other carbon atoms become entangled in cellulose in some cases, sugars, and proteins, some of which may not be extracted at all, some of which may become food or fertilizer and some of which may become biodegradable plastics, so indeed some, at least, of the carbon is "sequestered" in other substances.
You can argue against that point, but say, for the sake of this example that the carbon emissions were fed to beautiful Douglas Fir trees that grew tall for a hundred years. Would you refuse to count that as sequestration because the pine trees will eventually die and decay? CCS is essentially an "unproven" technology at this time, but it can be done in dozens of different ways, and "growing fuel", even though the sequestration is only temporary seems like one of the better ideas around.
Sincerely,
Stafford "Doc" Williamson
Comment
3 of 13
September 29, 2009
I believe a shortcut to cost-effective, large-scale algal biofuel implementation could be achieved by utilizing easily grown wild algae as solid fuel. "Biocharred" or compressed into pellets, wild algae biomass could be cofired with other solid fuels or burned directly as a carbon neutral energy resource. Whether collected in situ (think: massive Gulf of Mexico dead zone) or intentionally grown on wastewater streams, wild algae derived solid fuel truly represents the "low hanging fruit" of the biofuel tree.

Thomas Sullivan
Vineyard Haven, MA
Comment
4 of 13
September 29, 2009
Stafford,

Yes, some algae will become food for people, or fish, or livestock, which will use the cellulose, sugar and proteins for energy and breathe out the carbon dioxide into the atmosphere, or perhaps the acidifying oceans. Some algae will be left to rot on the land, consumed by microbes for energy, and the microbes will release the carbon as CO2 or possibly the stronger greenhouse gas, methane into the atmosphere, as the nitrogen fertilizes the plants.

I'll agree that if it's turned into plastics, that miniscule fraction of the carbon will be sequestered. But if the plastic is truly biodegradable, consumed by microbes, and not just breaking down into smaller and smaller pieces of plastic, then the microbes again would release the carbon into the atmosphere, and it would not be sequestered. If the plastic is sent as Municipal Solid Waste (MSW) to be gasified or pyrolysed or otherwise processed and used for energy, the carbon will again be emitted back into the atmosphere.

If carbon is sequestered in the biomass of a forest, you can go and measure the biomass every year and see if the biomass is increasing, or decreasing. If it stays the same, I would consider the carbon to remain sequestered. I the forest grows bigger then more carbon will be sequestered. If the forest is burned to make space for algae farms, then the carbon in the part of the forest that was burned would no longer be sequestered.

If you can show me where the carbon emitters have set aside storage capacity where people can see sequestered algae accumulating from year to year and measure the stored biomass from year to year, then it would be just like the forest. But no one is planning that, are they?
Comment
5 of 13
September 29, 2009
Biochar that Tom mentions is interesting for sequestration because algae would be turned to carbon in a solid form and could remain on the ground, and not be oxidized into CO2 gas into the atmosphere. I would like to see more of that. But if it's used as fuel, like Tom suggests, it once again becomes carbon neutral and not carbon sequestering.
Comment
6 of 13
September 30, 2009
The carbon issue boils down to a simple question: Did you displace sequestered carbon in the form of oil, coal, or natural gas from being released into the atmosphere? Using algae or any other biomass to recycle the carbon already in the atmosphere certainly displaces the equivalent energy amount of carbon from being pulled from the earth and combusted. This is a good thing. Biochar put back in the soil takes it a step further by actually re-sequestering the carbon. This is also a good thing. Using the biochar as fertility for crops that convert the CO2 to oxygen is even better.
Comment
7 of 13
September 30, 2009
What I need to know is how does this scale down?

In a low energy future, successful technologies will depend on low-embedded energy and broad application by generalists.

EcoReality Co-op has lots of land and lots of water and some engineering expertise. How can we get started with biofuel from algae? Or is this technology strictly controlled by big money and highly trained specialists?

Too many people are worried about how things scale up. As fossil fuel goes away, the successful partial replacements will be those with low complexity and low embedded energy, according to H.T. Odum, David Holmgren, et. al.
Comment
8 of 13
September 30, 2009
I would never go so far as to say that economic algae growing for energy is impossible but it is very difficult. History is full of people who made statements such as "heavier than air, flight is impossible". Some of the difficulties and some of the possible solutions:
http://mtkass.blogspot.com/2008/09/biodiesel-from-algae-no-way.html
http://mtkass.blogspot.com2007/08/algae-culture-alternate-systems.html
William
Comment
9 of 13
October 1, 2009
Forget "sequestering"----there is no such thing. Energy flows from the sun to living organisms through the carbon cycle. From a biological aspect---if we use biomass as fuel, the carbon released from burning the biomass must of necessity come from the atmosphere. Plants only use CO2. No CO2, no plants, no fuel, no new CO2 in the atmosphere.

As for how much algae oil we'd need----not that much, we'd only need a fraction of the petroleum we use now. VW is has gasoline/compressed natural gas, and clean diesel/compressed natural gas bi-fuel(two fuel) engined vehicles on the market now. Clean diesel/CNG uses ULSD(ultra low sulphur diesel) and also compressed natural gas(methane). USLD is actually B5 biodiesel. Starting today, it is the only diesel you can buy.

Diesel engines are ideally suited to use biofuels to take advantage of their much higher octane ratings and deliver much higher power for size and mileage than gasoline. That is why they have always been used for industrial use. The first engine Rudolf Diesel built ran on peanut oil.

With a diesel/cng engine----you can run on B5, B50, or B100(100% bio)
Methane can also be made from biologic sources. Let's say that drivers run 1/2 the time on diesel and 1/2 on cng. We only 50%-5% or 45% of the petroleum they were using. Let's say they start using B50----they are only using 25% petroleum-----B100 1/2 of the time, and CNG 1/2 of the time----means they are doing their driving with no petroleum at all.

Make the gasoline models flex fuel----and run on E85 1/2 the time, and they will be using only 7.5% petroleum.

Both petro and bio diesel fuels have problems starting and gelling in cold. A CNG bi-fuel engine completely bypasses that problem-start and run the engine till it is warm, then switch to liquid fuel if you need to.

Natural gas is cheap and abundant.
Comment
10 of 13
October 1, 2009
Fred, can you give me a link to more information on this diesel/cng bi-fuel engine? I've found VW TDI diesel cars whose warranties are voided by using B100 or anything higher than B5, and I've seen VW bi-fuel cars that run on LPG/CNG, and even CNG/gasoline. I couldn't find diesel/CNG bifuel engine.
Comment
11 of 13
October 2, 2009
Carolyn----the Passat TSI(bi-fuel, I think they call it Ecofuel)is on the market now in Europe, and the plan is to introduce the diesel/cng on the Jetta TDI this model year(2010). They are not offered in the US yet.

B5 is the only diesel fuel you can get in Europe(and now the US as of today).

Jetta TDI

http://www.vw.com/jetta/en/us/?tab=tdi

Fuel Consumption*
TDI
City mpg (man/auto) 30/29
Highway mpg (man/auto) 41/40

I do a lot of mountain driving---I'd definitely opt for the diesel with almost 50% more horsepower than the Prius---but I'd get around 10 mpg less I think, 20% less mileage--50% more hp. Trade off.
Comment
12 of 13
October 2, 2009
Fred, thanks for the model name. It looks like the Passat TSI EcoFuel runs on CNG/gasoline, not CNG/diesel. Though the info is a bit confusing.
http://www.iangv.org/tools-resources/oem-vehicle-directory/Vehicles-by-Type/Cars/Volkswagen-Passat-TSI-EcoFuel-CNG/details.html
Comment
13 of 13
October 3, 2009
This article is much more reasonable than the hype we have to hear from individual companies in the algae field. Of course, algae deserves consideration, but not breakthrough status sought by some of these companies.
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