In the last years, the world have seen greater impact in water recycling sector. Several water treatment plants have been installed everywhere out of which gew are listed below along with a bit of their feature.

1. Stickney Water Reclamation Plant, Chicago. Capacity: 1.44 billion gallons per day. Owner: Metropolitan Water Reclamation District (MWRD). The Stickney WWTP, located on 570 acres in Cicero, Illinois, southwest of Chicago, serves 2.4 million people living in Chicago and 43 suburban communities.

2. Deer Island Sewage Treatment Plant — Boston, USA. Capacity: 1.27 billion gallons per day. Owner: Massachusetts Water Resources Authority (MWRA). Driven by a federal court order in 1986 to end the discharge of 500 million gallons of poorly treated wastewater a year into Boston Harbor, the MWRA launched an 11-year, $3.6 billion program to upgrade treatment for the greater Boston area. 

3. Detroit Wastewater Treatment Plant — Detroit, USA. Capacity: 930 million gallons per day. Owner: Detroit Water and Sewerage Department. The plant began operating in 1939, and only offered primary treatment at that time. 

4. Bailonggang Wastewater Treatment Plant — Shanghai, China. Capacity: 528 million gallons per day. Owner: Shanghai Municipal Sewerage Company. The largest plant in Asia, Bailonggang first began operating in 1999, and expanded to it?s current capacity in 2008. 

5. Stonecutters Island Sewage Treatment Works — Hong Kong. Capacity: 455 million gallons per day. Owner: Hong Kong Drainage Services Department. The Stonecutters Island plant, which began operating in 2001, only offers chemically-enhanced primary treatment.