During Rig-Vedic era, the basic unit of power lied within a patriarchal family (Kula). The head of the family was a Kulapa. A group of such families called grama, which was controlled by a village headman Gramini. The groups of the villages belonged to a clan (Vis) and many clans made a community called Jana
A wastewater treatment plant is a facility in which a combination of various processes (e.g., physical, chemical and biological) are used to treat industrial wastewater and remove pollutants.
Type of wastewater treatment which aims to remove contaminants from sewage to produce an effluent that is suitable for discharge to the surrounding environment or an intended reuse application, thereby preventing water pollution from raw sewage discharges.