The brewing process for beer produces a waste product known as spent grain. Also referred to colloquially as beer sludge, spent grain is often repurposed as cattle feed or used to make biogas. In some cases, however, spent grain must go to the landfill, where it proceeds to harm the planet by releasing methane as it decomposes. Scientists are therefore looking at ways that beer sludge can be upcycled into something more useful, for example food and drink.
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