• In Bangalore it is now mandatory for all complexes with 20 or more flats to set up STP within 3 months
  • Big Relief to Bangalore Apartment Owners- MoEF dilutes Discharge standards on 13-10-2017 to make it easy for STP owners
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  • BBMP issues guidelines on setting up STP in apartments in Bangalore. Details in this website
  • Indus launches 'Zero Discharge Sewage Treatment Plants' & Instant Sewage Treatment Plants 'e-STP'
  • Effluent Treatment Plants for Restaurant, Car Wash & Diary Industry
  • We have launched 'Zero Discharge Sewage Treatment Plant' for 100% recycle of Sewage
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Aerobic Treatment – Options and Technical Developments
Aerobic Biological Treatment of Sewage can further be categorized into Suspended Growth and Attached Growth.

In suspended growth, bacteria remains in suspension in water and grows. It also attaches to the bottom and side wall of the aeration tank. This limits the growth of bacteria. Extended aeration is one of the popular and most widely used Suspended Growth processes.

Attached growth is a more modern development wherein various plastic media are submerged in sewage within the aeration tank so that bacteria will attach and grow much faster. Submerged Aerated Filter (SAF), Submerged Aerated Fixed Film (SAFF), Rotating Biological Contact Filter (RBC) are some of the variants of this Attached Growth process. While this helped the growth of bacteria, it also resulted in troubles like excess growth of bacteria on the media surface requiring media cleaning and was obstructing air flow within the aeration tank.

These twin problems were solved by the modern process called “Moving Bed Bio Reactor (MBBR)”. In MBBR circular plastic media (usually 22 mm dia) is introduced into aeration tank. This media provides huge surface area for bacterial growth. Typical surface area is about 350 to 400 square meters for each cubic meter of media. This media has gears on outer surface which forces its rotation in aeration tank due to the aeration from tank bottom. This helps the dislodging of dead bacteria while providing sufficient air to live bacteria.