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Waste-to-Biofuels plant to make gas from garbage


March 3, 2010

Future site of the Waste-to-Biofuels complex

Future site of the Waste-to-Biofuels complex

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If you’re a fan of the original Back to the Future movie, then you probably liked the scene at the end where Doc Brown used some random household waste to fuel his time-traveling DeLorean. Well, we’re now getting a little bit closer to that being a reality... sort of. While practical flying cars, time travel and cold fusion are still a ways off, the ability to power your car with garbage isn’t. Canadian biofuels firm Enerkem is currently working with the city of Edmonton, Alberta, to convert that city’s municipal waste into ethanol. This will lower the city’s greenhouse gas output, keep much of its waste out of the landfill, and produce a “clean” fuel Doc Brown would be proud of.

The City of Edmonton already diverts 60% of its municipal waste from the landfill. This is done through an extensive home blue-bagging recycling system, along with a waste-sorting facility. At the facility, recyclable materials that missed the blue bags are extracted from household garbage, while organic materials continue into the enormous Edmonton Composting Facility. The 40% that’s left over is what will be used in Enerkem’s Waste-to-Biofuels complex.

The thermo-chemical process will begin with shredded waste being fed into a gasifier, where its chemical bonds will be broken and its carbon content will become a synthetic gas. That gas will then be cleaned, conditioned, then catalytically-converted into liquid, market-ready ethanol and methanol. Much of the inert material that’s left over will be used as aggregate for construction materials, or even used to power the system itself.

Enerkem claims it will be an energy-positive process, meaning it will create more power than it uses. It should also require minimal water usage, and could even be a net producer of water, as it will be extracting moisture from the waste.

The Waste-to-Biofuels complex is currently under construction, and is scheduled to be complete and operational by 2011. It is expected to initially produce 36 million liters (9.5 million gallons) of ethanol, from 100,000 tonnes (110,231 US tons) of sorted waste, per year. If it works as planned, only 10% of Edmonton’s municipal waste will end up in the landfill.

About the Author
Ben Coxworth An experienced freelance writer, videographer and television producer, Ben's interest in all forms of innovation is particularly fanatical when it comes to human-powered transportation, film-making gear, environmentally-friendly technologies and anything that's designed to go underwater. He lives in Edmonton, Alberta, where he spends a lot of time going over the handlebars of his mountain bike, hanging out in off-leash parks, and wishing the Pacific Ocean wasn't so far away. All articles by Ben Coxworth

I\'m curious if this is more cost/energy efficient than processing waste-to-electricity via plasma (http://discovermagazine.com/2007/may/the-ultimate-garbage-disposal).

Either way, it\'s great to see new ways to convert waste into something useful.

Suman Subramanian

Did we not see a much simpler garbage-to-fuel processor come through the info-pipeline here not too long ago? This one looks ginormous and expensive. I wonder how long it would take this plant to pay for itself....

Will, the tink

If this plant is as energy-positive as the article says, then it will probably pay for itself in at least a decade or so (just a prediction here okay). If it works then it could possibly spark off other plants like this one.

Well, it\'s nice to see this kind of stuff up and about.

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