Penn State environmental engineers estimate, based on tests with wastewater from small Pennsylvania food processors, that typical large food manufacturers could use their starch-rich wastewater to produce hydrogen gas worth close to $5 million or more each year. They present their findings today at the 103rd General Meeting of the American Society for Microbiology.
Steven Van Ginkel, doctoral candidate, and Dr. Sang-Eun Oh, post-doctoral researcher in environmental engineering, conducted the tests.
"In addition to hydrogen, which can be used as a fuel and industrial feedstock, methane, the main component of natural gas, can be generated from the wastewaters," says Van Ginkel. Both hydrogen and methane can be converted into electricity via fuel cells at close to 80% efficiency. "By extracting hydrogen and methane from their wastewaters, these plants can also reap significant savings by not needing to aerate. Aeration makes up 20 to 80 percent of wastewater treatment costs."
Jim Sliwa | EurekAlert!
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