Manure from millions of hogs fuels natural gas
One recipe for renewable natural gas goes: Place manure from about 2 million hogs in lagoons, cover them with an impermeable material and let it bake until gas from the manure rises. Then, use special equipment to clean the gas of its impurities and ship the finished product out.
That's the vision of one of the largest biogas projects of its kind in the U.S. currently being installed in northern Missouri, part of a long-term effort to turn underused agriculture resources into an engine for environmentally friendly farming practices.
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