Excerpted from a case study written by Sharon Boddy for Canada Mortgage and Housing Corporation
Klosterenga, a 35-unit residential apartment building located in Oslo, Norway, shows how well-thought-out building design coupled with a wide range of energy-and water-conserving features can reduce energy and water use. With a high thermal mass and a combination active/passive solar system, Klosterenga uses less energy than a building of a comparable size.
Greywater (from dishes, laundry) is first pumped to a septic tank buried beneath the courtyard. It is then pumped to a vertical downflow single-pass aerobic biofilter, then through a porous subsurface filter for irrigation. The cleaned effluent from the pond is discharged to a local stream.