Cheaper Fuel From an Unlikely Source

If you drive — or even if you don't — fuel prices are probably on your mind.

But paying more at the pump isn't the only thing that people are concerned about. They're also increasingly aware that relying on gasoline is terrible for the planet.

As far back as 1826, people have been researching alternatives to highly polluting gasoline. A brief history of biofuel shows that, in that year, a new environmentally friendlier option hit the market: ethanol. It was made by converting parts of plants into energy.

Ethanol soared in popularity during World War II as a result of fuel demands, but it never became the dominant source.

But here's the problem: It's always been more expensive than lead fuel. On top of that, countless companies have failed to keep promises of big improvements in ethanol, leading to a "boy who cried wolf" stigma surrounding the science.

But a new project is closer than ever to solving that dilemma.

Xylome researcher Thomas Jeffries and a team of supporters from the Great Lakes Bioenergy Research Center (GLBRC) have tapped into a wild new source for ethanol production. They found that a yeast — S. passalidarum — living inside beetle guts is super efficient at converting xylose, a plant sugar, into energy. A little bit of engineering has made it even more efficient.

Timothy Donohue, principal investigator at the GLBRC and a microbe expert, says that "bacteria prefer to eat sugars like glucose and tend either not to metabolize xylose or do so very slowly and poorly."

This is a problem considering that it means a waste of resources within the plant materials.

The US Environmental Protection Agency (EPA) lists other alternative fuels, such as methane and electricity from wind. It's true that neither of these produce as much emissions — wind doesn't produce any — as the CO2 released by the burning of lead fuel, but they aren't perfect, either.

Methane is released into the atmosphere at a lower rate, but it is also much more potent than CO2, enabling it to trap more heat and further global warming.

And wind energy may seem glamorous from the outside, but it's got its own flaws as well. Wind turbines result in mortality of birds and bats in a plethora of ways, including direct collision, habitat fragmentation caused by the need for space, and sudden changes in air pressure around the turbines leading to traumatic injury.

Few options seem to be able to compete with the combination of environmental friendliness and efficiency that Xylome's new product hopes to provide.

Says Donohue:

The more xylose that microbes will eat, the more fuel that can be produced (in this case, ethanol). Xylome is using these improved microbes to enhance ethanol production, thus providing more fuel per ton of biomass that is processed. This will also enhance profitability of making other fuels or chemicals from xylose in the future.

The new method works for not only the traditional corn crops, but also different types of grasses and wood and the nonedible parts of plants. This means that ethanol production isn't depleting an ever-demanded food supply. An even bigger bonus is that existing manufacturing locations will be used for the new production rather building new ones. Win-win for the environment!

The process is expected to totally change the economic dynamics of ethanol, as these strains will allow companies to better convert xylose into a host of products. The new method will make its public debut on June 20 to 23 at the International Fuel Ethanol Workshop & Expo in Milwaukee, Wisconsin.

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