Sewage Treatment Plant

A Sewage Treatment Plant (STP) is a facility designed to treat and manage wastewater, also known as sewage, before it is released into the environment or reused. The primary objective of sewage treatment is to remove contaminants and pollutants from the wastewater, making it safe for discharge or reuse.
https://kelvinwatertreatment.com/sewage_treatment_plants.html
https://www.kelvinindia.in/blog/what-is-stp-segmentation-targeting-positioning-how-to-use-stp-model/