Science Invention: South Africa Students Invent ‘Urine Bricks’
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 say 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.