Researchers from North Carolina A&T State University have developed a process
that uses pig manure as a low-cost replacement for petroleum in the production
of road asphalt. In searching for bio alternatives, the group discovered that
swine waste is especially rich in oils very similar to petroleum, at a grade
too low to make gasoline but suited for asphalt. With funding from the
National Science Foundation, the group developed a process that turns the
waste into a black crude - the sticky binder that can be used to make asphalt.
* Financial impact: cost to process the manure oil is US$0.56 a gallon, which is much cheaper and greener than current petroleum binders.
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