There is! It's called the PPlanter, and it's a public restroom (for urinating only - no No. 2 here) that doubles as a planter or garden. It works by filtering the, well, pee-pee of patrons into a bamboo planter; the bamboo then does its own filtering job and releases clean water back into the environment. The process eliminates urine odors while adding greenery to the public scene.
On its website, PPlanter.com, the unit is described as "a rapidly deployable, reconfigurable public urinal and sink that uses modular biofilters to treat urine and wastewater." Here is a more in-depth description of how the PPlanter works:
- An ADA-compliant sink is supplied with a human powered foot or hand pump connected to a freshwater supply tank. The greywater from the sink, along with soap residue, flushes and cleans the urinal, keeping odor to a minimum.
- The greywater, soap and urine (blackwater) from the ADA-compliant urinal are funneled to a sealed storage tank. The combined water is then pumped into an adjacent planter that houses bamboo plants set in a lightweight mixture of soil and recycled styrofoam coated in pectin. The water from the urinal and sink is evapotranspired by the bamboo and released into the air as distilled, purified water. The bamboo harnesses the incredible amount of nitrogen and phosphorus found in the urine and uses it to produce more bamboo. With high traffic urinals additional planters can be added to the system.
This is what the PPlanter unit looked like during a public trial in 2013:
The concept is great, but there are a couple obvious issues: The PPlanter as pictured doesn't provide full privacy; also, it offers a urinal only, so women would have to use a specially designed, provided funnel to pee standing up. Those issues will have to be addressed before the PPlanter would ever gain widespread use. But it's very early days in the PPlanter's design.
You can read more about the PPlanter on Gizmodo.