Discussion
Select the suspended growth process of biological treatment from the following :
Answer: A
The suspended growth process is the Activated sludge process.
In a suspended growth system the microorganisms are kept floating in the wastewater as flocs, mixed and aerated in a tank. The activated sludge process works this way, and part of the settled sludge is returned to keep the microbial population high.
The other three are attached growth (fixed-film) systems, where the microbes grow as a biofilm on a surface. In a trickling filter it is the stones or plastic media over which the sewage trickles, in a rotating biological contactor it is a set of rotating discs, and in an anaerobic filter it is packing media in a closed reactor.
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