From Live Science:
After beer is made, the waste from breweries could help generate power, researchers now suggest.
One problem brewers face is what to do with the thousands of tons of grain left over at the end of the brewing process. In the past, they just sold the waste to farmers who either fed it to their animals or spread it on their fields as fertilizer. However, in Europe, given reductions in cattle breeding and stricter regulations on what waste is allowed on land, neither option is as easy anymore.
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