SA students invent ‘urine bricks’

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    University students in South Africa say they have created new environmentally-friendly bricks using human urine.

    The students from Cape Town combined urine collected from men’s toilets with sand and bacteria – in a process that allows the bricks to solidify naturally at room temperature.

    They said an enzyme in the mixture breaks down the urine to produce calcium carbonate – a key component of limestone – which binds the other materials together.

    Regular bricks need to be baked in high-temperature kilns, that produce large amounts of carbon dioxide.

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