Public Urinal Feeds Plants With Pee

by Sami Grover
from http://www.treehugger.com/

Image credit: Tuvie/Eddie Gandelman

The idea of urine separation to ward off peak fertilizer is not exactly new. But while some of us get to pee on our garden mulch, or urinate on our compost heaps, infrastructure for large-scale urine collection in an urban environment still seems a ways off. But here's a more decentralized option from designer Eddie Gandelman in the form of a public urinal that filters pee on site, and uses it to feed plants.

Posted over at design site Tuvie, the When Nature Calls urinal is in the concepting stages right now. While us TreeHuggers may focus on the tantalizing idea of resource efficiency and offsetting fertilizer needs, the primary motivation of the designer seems to be making public toilets a more pleasant place to be, and pee:

By setting up the restroom in pod format with 4 urinals on every pod, the users can enjoy more space and privacy. This system as well paves way for both peeing and watering the plants. Approved by a professor of toxicology, the project employs 3 processes. The urine thus collected is filtered, which is then used for the plants. Peeing, besides being a waste process becomes a nurturing one, which appears to be a great advantage here. This idea will certainly make the very notion of urination a better experience.

We're not the only ones to wonder if this could be taken a step further though. Michael Hines over at Trend Hunter writes about When Nature Calls, suggesting that restaurants and bars could could grow vegetables or fruits, cutting "costs and carbon at the same time." Of course some fairly careful monitoring would need to be done to ensure that the systems' filter mechanisms can get rid of potential pathogens or medications. And whether or not the public would be ready to accept such a direct and immediate connection between human waste and food remains to be seen—however safe it proved to be.

But hey, at least it's not a burger made from poop...

Better Tomatoes Via a Fertilizer of...Human Urine?

By Rebecca Boyle

Tomatoes C.P.Storm (CC licensed)

You say tomayto, I say tomahto.

You say Miracle-Gro, I say ... pee.

Apparently, human urine works remarkably well as a fertilizer for tomatoes, according to a new study out of Finland.

Plants fertilized with a mixture of stored human urine and wood ash produced 4.2 times more fruit than plants without the pee, the study found. The urine-fertilized tomatoes had more beta-carotene than unfertilized ones, and much more protein than traditionally fertilized plants.

And the tomatoes were just as good as those grown with traditional fertilizer, according to a panel of 20 brave tasters.

Healthy human urine is rich in nutrients like nitrogen, potassium and phosphate, all key ingredients for healthy plants. As long as the pee doesn't contain any fecal matter, it's usually free of any microorganisms.

Surendra K. Pradhan, K. Holopainen and Helvi Heinonen-Tanski of the University of Kuopio in Finland collected human urine during the winter of 2007-2008 from several eco-toilets in private homes. The urine was stored for about six months at 45 degrees F and tested for microbes and bacteria. The team mixed it with wood ash collected from a household furnace, and found the mixture was just as good as -- or better than -- conventional chemical fertilizer.

In taste tests, the urine-fertilized tomatoes tasted different from those fertilized with urine and ash, but tasters didn't have a preference -- "all tomato samples were evaluated as being equally good by the tasters," the study says. The results are reported in the latest Journal of Agricultural and Food Chemistry.

The same team had previously tested human pee as a fertilizer for cucumber and cabbage, and a South African team reported last year that urine had successfully fertilized maize. The Finnish team said they tried tomatoes because they're grown all over the world and are a staple ingredient in many recipes.

The use of urine to fertilize crops has been practiced since ancient times, but is relatively rare today, thanks to the ick factor and the prevalence of chemical and mineral fertilizers. But as farmers and home growers seek organic ways to grow food, urine could be a solution.

The study "may contribute to the development of positive attitudes about the use of urine and ash as fertilizer as a way to both increase crop yield and reduce water pollution," the authors wrote.

It may not be necessary to go all NASA with our pee and start drinking it. But if we can safely and efficiently grow food with it, why not?