A more encouraging algae story
by Ray Block
I have written on algae three times before. It is back in the news.
This time, the emphasis is not on Sapphire Energy, but on Solzayme, the South San Francisco start up. With an additional $ 22 million from the US Department of Energy for financing demonstration scale facilities preparatory to scaling up to a commercial plant. The company now has a capital base of $100 million. This should be sufficient for it make a faster breakout than its peers to become a real supplier of diesel and aviation fuel. And not just in token amounts.
The problem so far has been the great difficulties biofuel companies, outside the highly subsidised corn ethanol producers, are having in getting costs down to a point, where they can ever compete with conventional hydrocarbons.
I must confess that there is something appealing to me in algae, the humble pond scum, turning into a highly valuable commodity. And for good measure, you can make very tasty goodies out of it as well. Solazyme is gaining valuable cash flow in a sideline, which is quickly taking off.
Bryan Walsh writing in Time magazine (March 17 2010) says “the vanilla drink is the colour of butter and tastes almost as good- creamy and sweet, like a liquid pudding. Next I try a pair of golden cookies, lightly touched with sugar- they’re soft, chewy and filling. Last is a mustard dipping sauce, tangy, that coats a handful of pretzels with a pleasant honeyed zing.”
And to top it off for the health conscious, “the vanilla drink has 20 per cent fewer calories and 75 per cent less saturated fat than regular milk, while the dipping sauce has 74 per cent less calories and 85 less overall fat than average honey mustard dip.”
Unlike, Sapphire Energy, which grows algae by feeding it on carbon dioxide in sunlight in ponds, this is the process of photosynthesis to make the fuel, Solazyme feeds algae sugar fermenting it in a dark kind of beer brewing kettle.
The economics of production in the two systems are very different.
The open ponds and photo-bioreactor (PBR) techniques are infinitely more expensive. Says Joshua Kagan, who has researched algae in detail, Greentech Media(April 3 2010 “an algae strain must be identified and optimised for maximum growth. The correct location must be found, and as the algae grows, they need a constant supply of nutrients, C02, heat and light, which requires the consistent movement of water.
“Once the algae grows to a sufficient mass, it must be harvested, dewatered and dried before extracts of the oil can commence. These steps are energy and capital intensive. Once the oil is extracted, it is relatively simple to upgrade the fuel into jet fuel or diesel using traditional refinery techniques, but still costs an additional $0.25-0.40/gal. Taken together, algae grown in open ponds or PBRs are estimated to cost $8-$30/gal.”
The comparison to Solazyme’s methods of production could not be any greater, and it is also far more cost effective. By growing the algae in the dark, the energy costs of artificial light is avoided, and the fermentation process requires a fraction of the water usage. Another positive is that the strains of algae don’t require CO2, which depending on the location can be a big cost. Finally, removing the water isn’t an issue when grown in dark vessels.
Although Solazyme uses a lot of sugar to feed the algae, the company has a supply agreement with second generation sugar producer, BlueFire Energy to obtain sugars derived from non food sources.
The big advantage algae has is that it can double in size daily and account for approximately 60 per cent of the oxygen production on earth. By comparison with corn ethanol, harvesting yields the equivalence of 270 gallons per acre per year, compared with algae’s 1500-1800 gallons per acre per year.
Let’s hope that Solazyme’s dark vessel production method is as cost effective as they say, and commercial production is only around the corner.
an
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