Coffee’s second life: How your morning brew’s waste can detoxify heavy metals from water Scientists repurpose used coffee grounds into a water purification material. The grounds are transformed into a highly absorbent biochar or used raw. These materials effectively remove toxic heavy metals like lead from water. The process tackles both global coffee waste and water pollution simultaneously. It offers a low-cost, sustainable blueprint for decentralized water treatment. You brew it, you drink it, and you toss the used grounds in the trash. That daily ritual, repeated billions of times globally, creates a mountain of waste. But what if that discarded pile held…

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