A by-product of biodiesel could end up being another feedstock for more of the green fuel.

This article from Biodiesel Magazine tells how Spain-based Neuron BioIndustrial is turning glycerin, made during the biodiesel brewing process, into an oil called MicroBiOil, which, in turn, is being made into more biodiesel:

Neuron BioIndustrial has selected a specific type of microorganism that metabolizes large quantities of raw glycerin as the sole carbon source. The resulting microbial mass contains more than 50 percent of its dry weight as lipids. These microorganisms are nonpathogenic and are not genetically modified.

Thanks to this technology, the productivity of a biodiesel plant can be increased by 2 to 3 percent.

You can read more about the process on the Neuron BioIndustrial Web site.

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We love the idea of clean and green fuel. But they come with certain disadvantages. First one is they are heavy on pocket of a commoner. Second disadvantage is their power conversion rate is quite low. Last one is you need storage space to save all the power converted by a clean and green [...]
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Usually, we talk about using high-tech computer programs to help producers get more biodiesel out of their operations. But this time, it’s the low-tech components that are the platforms for growing a feedstock for the green fuel.

Treehugger.com has this post about how students at the University of Illinois at Urbana-Champaign have put together an algae bioreactor called the Bio-Grow to cultivate large amounts of algae for biodiesel using old computer parts:

“If someone had one of these in their homes, they would cultivate algae and extract it,” says Megan Kenney, one of the members of the five-person undergraduate team. “Then they could take it into a gas company that was set up with an oil filtration facility and get credit off their gas.”

“Algae’s best growth factors are within the red and blue spectrums of light at a ratio of four to one,” Kenney explains. “We also knew that it needed to be 62 to 82 degrees.”

The hope is that people will be able to grow algae as part of a larger system and take that algae to a central collection point. The lipids in the algae would be extracted and sent to a refinery to make biodiesel, while the by-products would go into livestock feed, fertilizer and pharmaceuticals. The Bio-Grow team believes just under 7 percent of American homes would need to have a device to grow enough algae to replace petroleum with algae biodiesel.

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