Sewage Treatment Plant

Sewage treatment involves three steps, the primary, the secondary and the tertiary.
In the primary process, the sewage is temporarily held in a quiescent basin where the heavy solids can settle to the bottom, while oil, grease and other solids float to the surface. These are removed and the remaining liquid is subjected to the secondary treatment, wherein the suspended and dissolved biological impurities are removed. In tertiary treatment, the treated water is disinfected chemically or physically, before discharging into streams or rivers.

SWAP provides different kinds of sewage treatment plants which vary in the process by which they treat wastewater. Generally, they can be classified into the following types of systems:

1. Activated sludge plant (ASP)
2. Moving Bed Biofilm Reactor (MBBR)
3. Membrane Bioreactor (MBR)
4. Sequencing batch reactor (SBR)
5. ZLD