At a Glance

As one of the 'green' features in a redevelopment project, an on-site wastewater treatment system minimized water consumption and maximized reuse.

Project Description

The 200 South Ashley Street Redevelopment Project is an urban brownfield redevelopment project. A seven-story mixed use residential, office and retail space was planned for the site. The building incorporated numerous ‘green’ features, including onsite wastewater treatment and reuse, rainwater harvesting, storage and reuse, green roofs, heat exchangers and environmentally sound building practices. The integrated design team aimed for LEED Platinum certification.

To minimize water consumption and maximize reuse, Biohabitats used integrated wastewater and rainwater harvesting with treatment, reuse and recharge processes. Biohabitats’ design approach included an onsite wastewater treatment system to produce reuse-quality water for toilet flushing or irrigation. Since this was an urban setting, space was at a high premium. To minimize the treatment system footprint the primary treatment tank, rainwater harvesting tank, polishing sand filter, mechanical filtration, and disinfection and reuse equipment will be beneath the building.

Reclaimed wastewater was utilized for toilet flushing. In the event of a reclaimed water shortage, harvested rainwater will be filtered and disinfected as a backup source, with potable water supplied only as a last resort. Excess water generated at the site will be used for aquifer recharge.



Great Lakes

Physiographic Province

Eastern Lake


Huron River

Expertise Areas

Infrastructure, Urban Ecology, Water


PMA Engineering


Ann Arbor, Michigan, United States