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Duke, Google turn hog waste into clean energy
Key Excerpts from Article on Website of San Francisco Chronicle/Los Angeles Times
Posted: January 3rd, 2012
ttp://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2011/12/25/M...
Loyd Bryant used to pump manure from his 8,640 hogs into a fetid lagoon, where it raised an unholy stink and released methane and ammonia into the air. The tons of manure excreted daily couldn't be used as fertilizer because of high nitrogen content. The solution to Bryant's hog waste problem was right under his nose - in the manure itself. A new waste-processing system - essentially a small power plant - installed on his 154-acre farm uses bacteria to digest the waste and burns methane to produce electricity. It also converts toxic ammonia into forms of nitrogen that can be used as fertilizer for more profitable crops. Waste-to-energy systems have been around for at least 15 years. But Duke University, which helped develop and pay for Bryant's system, says this one is the cleanest in existence - and virtually the only one that tackles all of the environmental problems created by animal waste. The system was built with off-the-shelf parts and simple design plans that are free for the asking. It's poised to become the standard for a cleaner waste-to-energy model that brings together farmers, utilities and private companies in an environmentally friendly effort. Bryant saves money on electricity and gets a cleaner farm. Improved air quality in his hog barns also means his pigs will have lower mortality rates and convert feed more efficiently, fattening Bryant's profits.
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