not much time to write a comment... but I copy here this great news about an innovative way to treat wastewaters that win the Young Architects Program in NYC. The project is COSMO and here a short part of the full article wrote by Jared Green and that you can read at the the following link:
http://dirt.asla.org/ about COSMO FULL ARTICLE
"The ingenious winner of this year's Young Architects Program (YAP) at the New York City's Museum of Modern Art (MOMA) PS1 is COSMO, a mobile, transparent, and artful system for purifying wastewater. Designed by Andrés Jaque's Office of Political Innovation, the machine aims to make visible the process of cleaning dirty water, exposing the value of this vital natural resources in the process.
Here's a description of Jaque's invention: "An assemblage of ecosystems, based on advanced environmental design, COSMO is engineered to filter and purify 3,000 gallons of water, eliminating suspended particles and nitrates, balancing the PH, and increasing the level of dissolved oxygen. It takes four days for the 3,000 gallons of water to become purified, then the cycle continues with the same body of water, becoming more purified with every cycle." The system uses no electricity, just sunlight and gravity to accomplish all of that."