Pharos-Tribune

Columns

May 2, 2014

PETERS: From shopping bags to diesel fuel

My household accumulates quite a number of plastic shopping bags. Most come home with me from the grocery store. I use them to line the little garbage pail that sits under the kitchen sink and the wastebasket that’s in the bathroom. I also have the joy of using them to pick up poop deposited by Buster Brown, my faithful mutt from the pound.

But if you don’t have uses for the plastic shopping bags you bring home, what do you do with them? Researchers hope that one day — perhaps sooner rather than later — your bags may be turned into alternative fuels such as diesel. That’s right, plastic shopping bags could help power diesel engine cars and pickup trucks.

It’s not as pie in the sky as it may sound. Converting shopping bags into fuel requires less energy than it produces. The key is the high-temperature breakdown of plastic in the bags — done in the absence of oxygen, or anaerobically.

The lead author of a recent study on this topic is Dr. Brajendra Sharma of the Illinois Sustainable Technology Center. The ISTC is part of the University of Illinois. His research write-up was recently published in the journal Fuel Processing Technology. Sharma’s article points out that about a trillion plastic bags were produced in the U.S. in 2009, the last year for which figures are available. Of these, only about 13 percent were recycled. Some of the rest were doubtless reused for household purposes, like mine are, and after that headed to landfills. But many of the bags aren’t recycled or reused and go either directly to landfills or are released into the environment as litter.

Plastic bags that become litter blow around and cause a number of problems beyond being an eyesore. They can kill animals that ingest them or become tangled with them. In the oceans, they compose part of what’s termed the Great Pacific Garbage Patch of floating trash.

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