_:b670475533 . _:b670475533 "Waste water which was converted into an effluent that can be either returned to the water cycle with minimal environmental issues or reused."@en . _:b670475533 . _:b670475533 . _:b670475533 . _:b670475533 "https://www.usgs.gov/special-topics/water-science-school/science/wastewater-treatment-water-use" .