South Africans make bricks of human urine.

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South Africans make bricks of human urine.







CAPE TOWN (Reuters) - South African researchers say they have made bricks using human urine in a natural process that involves colonies of bacteria, which could one day help reduce global warming emissions by finding productive use for the final waste product . 

The gray bricks are produced in a laboratory for eight days using urine, calcium, sand and bacteria. Fertilizers are also produced during the processes. And no, the bricks do not smell. 

The bricks are made with urea, a chemical found naturally in urine and also synthesized around the world to produce fertilizers. The process of growing urea bricks has been tested in the United States with synthetic solutions, but the new brick uses real human urine for the first time, the researchers said. 

"We literally pee all this every day and throw it through the sewer networks," said Dyllon Randall, a senior lecturer in the department of civil engineering at the University of Cape Town who is part of the team that developed the brick. "Why not recover this and make multiple products?" 

Biological bricks are created through a process called microbial-induced carbonate precipitation, which is similar to the process naturally produced by coral reefs. 

The loose sand is colonized with bacteria that produce the urease enzyme. The enzyme breaks down urea in the urine, while producing calcium carbonate, a rocky substance, through a complex chemical reaction. 

You can make a brick or column in any way. Bricks are formed at room temperature, reducing the harmful carbon dioxide emitted when making normal bricks that are fired in the kiln. 









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An obstacle that prevents mass production: bricks use huge quantities of urine. To make a single brick, about 20 liters of urine are required, a couple of weeks for a typical adult. 

"So, I get it from the children's bathroom in front of the lab, I made a small record and all the guys from the university contribute to my research," said Suzanne Lambert, who tested the concept of research by making the first brick. 

"I definitely see marketing in the next decade or two, but there is still a lot of laboratory work to be done," he said. 





Edition by James Macharia and Peter Graff





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