So much of the design is a ...

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So much of the design is a function of flow, avaiable land, it's location and nature of the Wastewater. If strictly domestic waste or if mixed with Industrial or commercial waste. 

Obviously industrial waste may require a pre-treatment if harmful chemicals are discharged, if pH or mineral loading excessive, etc.

If commercial waste with high BOD, Fats, or surfactants etc., additional treatment steps would be needed..

Without detailed info on the wastewater composition, it would be hard to suggest best treatment practice.