The so-called bio-bricks are made using human urine from men's toilets, sand, and bacteria that produce urase. How are they…
The so-called bio-bricks are made using human urine from men’s toilets, sand, and bacteria that produce urase. How are they better compared to limestone bricks?
The engineering students at the University of Cape Town involved In the project, first collected urine from men’s toilets. They then combined the urine with sand and bacteria in a process known as microbial carbonate precipitation.
The bacteria produce urase, an enzyme that breaks down urea into urine, forming calcium carbonate which then binds the sand into bricks.
Dyllon Randall, the lead supervisor of the students, explained that the process is essentially the same as how corals are made in the ocean.
Randall sa at jo længere bakterierne er tilladt at fremstille cement, desto stærkere bliver produktet.
9659005] He also said that when the process was started, they only achieved the same compressibility strength as 40 percent of a limestone brick.
They eventually doubled the strength by just changing the materials that they put into the mold and allowing the bacteria
“If a client wanted a to cement the particles for a longer time.”
The bricks can now be made to be as hard as a limestone, although the strength of these bricks would depend on the needs of the client. brick stronger than a 40 percent limestone brick, you would allow the bacteria to make the solid stronger by growing it for longer, “said Randall.
” The longer you allow the little bacteria to make the cement, the stronger the Product is going to be. We can optimize is that process. “
Most of the bricks produced worldwide are still made using the rudimentary process that involved getting the materials kiln-fired at temperatures around 1,400 C, which produces copious amounts of carbon dioxide.
The process involving the bio-bricks, on the other hand, produces zero waste because the by-products are nitrogen and potassium, elements that are used in commercial fertilizers.
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