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MBBR / FAB Treatment of effluents with micro organisms developed as biofilms on biochips in a aeration tank, so as to reduce pollutant load (COD/BOD) in a Secondary Treatment process is called as Moving Bed Biofilm Technology.Due to Providing La surface area via biochip the micro organisms will not easily come out from the system and they develop biofilms on the cal element/biochip to easily degrade the organic material and to reduce the pollutants (COD/BOD) load. The biofilm carrier elements being kept suspended in the water by air from the diffusers in the aerobic reactors, and by means of a Mixer in the reactors. The fluid aerobic bioreactor (FAB) is based on the concept of suspended growth as well as attached growth processes. The media has a sp gravity less than that of water. Hydraulic currents set by aeration facilitate fluidisation the media.

SAFF The submerged aerobic fixed film process (SAFF) also known as tricking filters comprises of specially designed media that facilitate attached fixed film growth of the microorganisms. The aerobic environment in the SAFF reactor is achieved by using fine bubble diffused aeration, which also serves to maintain liquid in a completely mixed regime. Biological growth on the media surface of trickling filters converts dissolved organic waste material into by products like carbon dioxide, nitrates, water and biological solids which are later removed by clarification.
Submerged Aerobic Fixed Film & Needs a smaller settling tank, due to higher settling rate of sludge. Requires skilled monitoring.