The Orange County Sanitation District is about to begin converting human waste into hydrogen fuel in a first-of-its-kind attempt to turn sewage into a salable product.
The district, along with UC Irvine researchers and private companies, has agreed to install the new device in an $8 million demonstration project that could begin operating by May.
And if it takes off, sewage treatment plants around the country could one day double as gas stations – emphasis on the gas.
….The Sanitation District has used methane gas from sewage to power its systems for years. The new device, built by Air Products of Pennsylvania and FuelCell Energy of Connecticut, takes this much farther: it will use methane to provide three separate streams of energy.
The methane comes from the sewage plant’s ‘digesters,’ large chambers where sewage is heated, allowing bacteria to break it down into methane and carbon dioxide.
First, the methane will be used in the traditional way, to generate electricity. Second, waste heat from the fuel-cell device will be recaptured, and pumped back into the digester to help heat the sewage.
And third, hydrogen will be chemically separated from the methane and pumped into storage tanks, where it will be ready for use in hydrogen cars….
http://www.nextenergynews.com/news08/next-energy-news8.15.08a.html