In our book, we use the example of an earthworm as almost perfect sustainability.  GIGO, only in the earthworms case, the garbage that goes in as it eats its way through the earth, comes out the other end as better “earth” than what went in.  That is sort of the way GPGT works.  A garbage truck picks up at curbside.  After it makes its rounds, the truck heads to the landfill where the garbage is dumped and covered.  The garbage decomposes and forms, among other byproducts, methane.  The methane is tapped off, processed and used to fuel the garbage trucks.  Sounds simple, doesn’t it?  When you put it that way, it is, however, there were lots of complex projects undertaken to make it happen.

There’s plenty of stuff to decompose in a landfill, from food scraps to lawn trimmings.  It has been happening for years and as natural gas and propane become more and more expensive, a project to recover methane from landfills became more attractive.  From the altruistic point of view, not allowing methane to escape into the air, or being burned off to contribute to green house gases improves air quality.  But face it, the incentives from the government, and the savings from not having to buy fuel on the open market are pretty good project drivers.

According to  Jennifer Andrews, Director of Communications for Waste Management Inc, there are more than 300 trash trucks (the industry likes the name trash truck rather than garbage truck) fueled by garbage, or rather the methane produced by “trash”.   Waste Management (WM) Inc, the country’s largest provider of waste management services, along with Linde North America, a world leading gases and engineering company, built a liquefied natural gas (LNG) landfill gas designed to purify and liquefy the landfill gas at WM’s Altamont Landfill near Livermore, California.  It has a capacity to produce up to 13,000 gallons/day of natural gas to fuel the WM’s trash collection vehicles.

This project is also part of the company’s environmental sustainability initiative to double its waste-based energy production from the equivalent of 1 million homes to 2 million homes by 2020. WM is also directing capital spending of up to $500 million per annum over a 10-year period to increase the fuel efficiency of its fleet by 15 percent and reduce fleet emissions by 15 percent by 2020 as well as investments in new technologies to enhance their business according to their website www.wm.com.

WM and others are continuing to explore landfill gases as alternate fuel sources.  We’ll keep you informed of other projects in the future.  WM is certainly going to make our next “At the Top of Their Game” list for companies who are doing their sustainable best.