The physical infrastructure used for wastewater treatment is called a wastewater treatment plant.
An effluent sump pump, for instance, pumps waste from toilets installed below a main sewage line. In the context of waste water treatment plants, effluent that has been treated is sometimes called secondary effluent, or treated effluent. This cleaner effluent is then used to feed the bacteria in biofilters. Wastewater treatment effluent or discharge is the final product from a wastewater treatment plant. Because of the Federal Clean Water Act, the requirements for the treatment of the water is set on a plant-by-plant basis determined by the National Pollutant Discharge Elimination System (NPDES). Wastewater treatment is a process to convert wastewater-which is water no longer needed or suitable for its most recent use-into an effluent that can be either returned to the water cycle with minimal environmental issues or reused. The physical infrastructure used for wastewater treatment is called a wastewater treatment plant (WWTP). The treatment of wastewater belongs to the overarching field of sanitation, with the management of human waste, solid waste, sewage treatment, stormwater (drainage) management, and water treatment. Wastewater flows, or is pumped, through pipes to a wastewater treatment plant or a water recycling plant where it is treated so it can be safely returned to the environment or reused. We operate 30 wastewater treatment plants and water recycling plants that treat over 1.5 billion litres of wastewater a day. Treatment plants reduce pollutants in wastewater to a level nature can handle. Wastewater is used water. It includes substances such as human waste, food scraps, oils, soaps and chemicals. In homes, this includes water from sinks, showers, bathtubs, toilets, washing machines and dishwashers. Effluent, in engineering, is the stream exiting a chemical reactor. Effluent is defined by the United States Environmental Protection Agency as  wastewater-treated or untreated-that flows out of a treatment plant, sewer, or industrial outfall. Generally refers to wastes discharged into surface waters .
https://en.wikipedia.org/wiki/Effluent http://www.appropedia.org/Wastewater_treatment_effluent https://en.wikipedia.org/wiki/Wastewater_treatment_plant https://en.wikipedia.org/wiki/Wastewater_treatment_plant http://www.sydneywater.com.au/SW/teachers-students/facts-about-water/primary-students/where-does-water-go-/wastewater/index.htm http://water.usgs.gov/edu/wuww.html https://en.wikipedia.org/wiki/Effluent
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