Suppose you are told that a process must achieve a

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1.State the two main reason why an activated sludge system is operated at a relatively low f/m ration?

2.Define the f/m ratio in the context of biological treatment of wastewater, and relate the f/m ratio to the exponetial growth and declinign growth phases of a bacterial culture.  Hoe does the f/m ratio influence the metabolism, the rate of BOD removal, and the settleability of sludge?

3.Suppose you are told that a process must achieve a 2.7 log removal of Giardia cysts.  What does that mean in terms of % remaining and % removal?

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