Wastewater Treatment Plants | Sewage Treatment Plants

Treatment process of wastewater such as sewage, sullage and kitchen waste involves multiple stages for the removal of sediments, dissolved / suspended organic contaminants, oil, grease, reduction of biochemical oxygen demand (BOD), chemical oxygen demand (COD) and nitrogenous matter to less than the regulatory standards stipulated for discharge or reuse.

The primary objective of sewage treatment is to make sure that the treated effluent does not contaminate the soil and ground water when discharged back to the environment or is safe to recycle for the intended uses. Treated sewage can be used at residential places, commercial establishments and factories for a multitude of purposes. It is estimated that fresh water consumption can be reduced up to 60% through recycling treated sewage.

The size of the sewage treatment plant and the technology used are primarily decided based on the sewage quantum and characteristics, output quality requirements, space availability, site conditions and applications of the treated effluent.

Types of Sewage Treatment Technologies and Processes

Sewage treatment plants (STP) can be designed in conventional, modular, packaged and containerized forms using a host of technologies referred here below.

  • Activated Sludge Process (ASP)

  • Fluidized Bio Bed Reactor (FBBR)

  • Submerged Aerobic Fixed Film Reactor (SAFF)

  • Sequential Batch Reactor (SBR)

  • Membrane Bio Reactor (MBR)

  • Moving Bed Biofilm Reactor (MBBR)