Sewage Treatment Plant

Sewage treatment is the process of removing contaminants from waste water and household sewage. It includes physical, chemical and biological processes to remove contaminants to produce and environmentally safe fluid waste stream (or treated effluent) and solid waste (or
treated sludge) suitable for disposal or reuse.

Using advanced technology, it is now possible to reuse sewage treated water for flushing, gardening etc.Treatment of sewage or wastewater protects public health and prevents pollution, disease as well as hazards from sewage contaminants. Hence, sewage treatment is required. It is one type of wastewater treatment methods which is designed to hold polluted water in specially designed compartments. This plant goes through series of stages thatinvolves extracting waste from the waste water influent.

Sewage Treatment Plant Process:

• Preliminary treatment plant:

  This is the first stage of sewage treatment plant process and its main objective is the removal of coarse solids and other large materials often found in raw wastewater. Preliminary treatment operations typically include large filtering screens, grit removal and, in some cases, breaking of large objects.

• Primary Treatment Plant:

  The main purpose of this treatment is to reduce any heavy solids (organic & inorganic) that settle to the bottom by sedimentation while oil, grease & lighter solids float to the surface by skimming.

• Secondary Treatment Plant:

  The prime objective is the further treatment of the effluent from primary treatment to remove dissolved and suspended biological matter. Secondary treatment removes more than 90% of suspended solids.

• Tertiary Treatment Plant :

  Tertiary treatment generally follows secondary treatment and aids the removal of those wastewater constituents which cannot be removed in secondary treatment.