Discussion
Select the attached growth process from the following :
Answer: C
The attached growth process is the rotating biological contactor.
In attached growth (fixed film) processes, micro-organisms grow as a film on a solid surface and the wastewater passes over them. A rotating biological contactor is a set of closely spaced discs on a shaft, partly submerged and slowly rotating, so the biofilm on the discs takes up organic matter while submerged and oxygen while in the air. Trickling filters are the other classic example.
The activated sludge process, the anaerobic contact process and the upflow anaerobic sludge blanket are suspended growth processes: the organisms are held in suspension as flocs or granules in the liquid, not fixed to a medium.
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