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A large supply of coffee grounds being dried out in cardboard boxes.
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Used coffee grounds

Used coffee grounds are the result of brewing coffee and are the final product after preparation of coffee.

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Used coffee grounds are the result of brewing coffee and are the final product after preparation of coffee. Despite having several highly-desirable chemical components, used coffee grounds are generally regarded as waste, and they are usually thrown away or composted. As of 2019, it was estimated that over 15 million tonnes of spent coffee grounds were generated annually. With this quantity of waste and the chemical properties of used coffee grounds, they have several potential uses.

Text from the Wikipedia article Used coffee grounds by its contributors, under CC BY-SA 4.0.