The Sidwell Friends Middle School in Washington D.C. has gained international recognition as the first LEED Platinum K-12 school building in the world built in 2006. 
"Its green features include a constructed wetland that treats wastewater on site, recycled building materials (such as reclaimed wine caskets to make the building's skin), three green roofs (that provide habitat, reduce urban heat island effect and insulate), sunshades, solar chimneys (which enhance natural ventilation), and rooftop photovoltaic panels (that provide for all the school's electrical needs)."More on the Constructed Wetland:
"Constructed wetlands use less energy to process waste than traditional municipal systems while creating habitats for plant and animal life. After first flowing through a treatment tank to remove solids, wastewater is treated using biological processes. Aquatic plants, water, microorganisms, sun, soil, sand, and air filter and clean the water. The process is completed with additional filtration of particulates and an ultra violet (UV) filter. The constructed wetland behind the Middle School building treats wastewater to the same standards as the city’s municipal system but due to current health codes, the water is reused only in the toilets and urinals. Models show that the building uses 93% less District water by treating our sewage in the wetland and reusing the water, as well as through water-efficient landscaping" More information here: Green Building (Sidwell Friends Middle School)
All Images from Sidwell Friends website.
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