Food waste cleans water, gathers metals for re-use

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Researchers from Spain’s Universidad de Granada and Mexico’s Center for Electrochemical Research and Technological Development and Center of Engineering and Industrial Development have found a way to put the more than 38 million tons of annual global citrus peel food waste to use. After treating orange and grapefruit peels with an Instant Controlled Pressure Drop, the fruit waste gains adsorbent properties. Adsorbent properties are distinct from absorbent properties. Adsorbing holds a material onto the surface of another object rather than soaking it up. When treated peels were packed into filter columns like those currently used in wastewater treatment plants, the…

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