Thursday, September 22, 2011

Poop Fuels Hydrogen Cars -

Clean fuel from sewage!
Steve Zylius / University of California-Irvine - National Fuel Cell Research Center associate director Jack Brouwer at the new "sewage-to-hydrogen" fuel pump. By John Roach, contributing writer at

An experimental fuel cell at a wastewater treatment plant in California is turning poop flushed down the drain into hydrogen fuel for cars.

More gas

The new system at the Orange County Sanitation District'sFountain Valley sewage treatment plant is fed more biogas than it needs for electricity generation. The excess hydrogen produced when mixed with the hot steam is siphoned off for refueling cars.

"We discovered that by doing that we actually substantially increased the efficiency of the fuel cell so that it produces more energy per unit of fuel going in and it allows that hydrogen to be generated for refueling at almost no energy cost," Samuelson said.

The current system uses a 300-kilowatt fuel cell, though the same type of fuel cell is deployed elsewhere at 1.2, 2.4 and 5.6 megawatts, he noted. So, the process is scalable.

In fact, the so-called tri-generation technology (heat, electricity and hydrogen) should work just as well at landfills as wastewater treatment plants. If so, the collective piles of human waste could "power more than 30 percent of the automobile population" in Southern California, Samuelson noted.

Hydrogen clusters

The novel technology at the Orange County Sanitation District seems fitting for the once-lauded hydrogen highway of the future that has evolved into a series of clusters.

Already, several hundred hydrogen cars are on the road and by 2015 big name automakers such as Mercedes, Honda and Chevrolet plan to have some 50,000 hydrogen-powered deployed in southern California.

Instead of putting hydrogen fueling stations up and down and between the coasts, the government-subsidized industry is putting filling stations where people will buy and drive the cars, explained Chris White, a spokeswoman for the California Fuel Cell Partnership.

"You probably go to the same two or three stations most of the time. We look at the same thing for these fuel cell vehicles," she told me today. "Where do people live, work and play?"
That's where they put what are now called the clusters and one of these clusters is in Orange County, where the new station will officially open on August 16.

"The fact that it's also making hydrogen from sewage is an awesome, awesome, bonus," White added. "We talk about running out of fuel one day, I can tell you we are never going to run out of fuel that's made from [sewage]." [The equipment and methods used are known as anaerobic digesters.]

More on hydrogen cars:

Funding for this $8 million to $9 million project was provided by the U.S. Department of Energy, the California Air Resources Boardand the South Coast Air Quality Management District. The station was designed by the University of California, Irvine, FuelCell Energy Inc., and Air Products and Chemicals Inc.
John Roachis a contributing writer for

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