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To make wastewater acceptable for reuse or for returning to the
environment, the concentration of contaminants must be reduced to a
non-harmful level, usually a standard prescribed by the Environmental
Protection Agency.

Sewage can be treated close to where it is created (in septic tanks,
bio-filters or aerobic treatment systems), or collected and
transported via a network of pipes and pump stations to a municipal
treatment plant.

Sewage treatment, or domestic wastewater treatment, is the process of
removing contaminants from wastewater and household sewage, both
runoff (effluents) and domestic. The task of designing and
constructing facilities for treating wastewaters falls to
environmental engineers. They employ a variety of engineered and
natural systems to get the job done, using physical, chemical,
biological, and sludge treatment methods. Its objective is to produce
a waste stream (or treated effluent) and a solid waste or sludge
suitable for discharge or reuse back into the environment. This
material is often inadvertently contaminated with many toxic organic
and inorganic compounds.

The features of wastewater treatment systems are determined by (1) the
nature of the municipal and industrial wastes that are conveyed to
them by sewers, and (2) the amount of treatment required to preserve
and/or improve the quality of the receiving bodies of water.
Discharges from treatment plants usually are disposed by dilution in
rivers, lakes, or estuaries. They also may be used for certain types
of irrigation (such as golf courses), transported to lagoons where
they are evaporated, or discharged through submarine (underwater)
outfalls into the ocean. However, outflows from treatment works must
meet effluent standards set by the Environmental Protection Agency to
avoid polluting the bodies of water that receive them.

http://shubhamindia.com/sewage_treatment_plant.htm
http://sewagetreatmentplant.in