The Sudwerk Brewing Company has teamed up with researchers from the University of California, Davis to create a system called the 'Pee Hive' that recycles urine to use as fertilizer. The project, aptly entitled 'Sustainable Fertilizer from Urine,' uses a customized outhouse on the brewery's premises that collects urine for the researchers to carry away to a treatment facility.
A brewery was a clever location for the Pee Hive, as beer is notoriously for bringing on frequent urination. As such, the tank on the Pee Hive can hold up to 250 gallons.
The urine to fertilizer process happens in three steps. First, urea in the urine is chemically transformed into ammonia. Next, the ammonia is evaporated to become ammonium carbonate. Finally, the treatment adds Epsom salt to extract the phosphate. The result is nitrogen and phosphate that's free of harmful chemicals and perfect for fertilizing crops.