A Living Machine (http://www.livingmachines.com and http://www.worrellwater.com/) system mimics a tidal wetland, one of nature’s most productive ecosystems.
The constructed wetland is just one of many green technologies that the San Franscisco Public Utilities Commission will be implementing in its new 13-story building. The structure will also generate its own energy through solar panels and wind turbines."
I can add that also wastewatergardens (http://www.wastewatergardens.com/) build functionally and beautiful TWS in Indonesia and this is not a design.. this is real. FANTASTIC!
(Ph. F. Cattin wastewatergardens.com)