Addition and Renovation, 2009
It underwent significant upgrades starting in 1998 to enhance its capacity by 50% and to comply with the U.S. Clean Water Act. The project, set for completion in 2014, included unique public amenities such as a visitors' center with a manmade waterfall, a nature walk along Newtown Creek, and aesthetic enhancements. These features were influenced by community involvement and a city law requiring public art expenditure for public works projects. The plant's sludge digesters, housed in egg-shaped structures, utilize anaerobic digestion to convert sewage sludge into fertilizer.
The city appointed Ennead Architects, collaborating with environmental engineering firms Greeley and Hansen, Hazen and Sawyer, and Malcolm Pirnie. Artists and designers, including Vito Acconci, Hervé Descottes, and George Trakas, have contributed to the project's distinctive elements, such as the waterfall, lighting design, and nature walk.