s no strait forward answer to ...

s no strait forward answer to your question.  Process design of wastewater treatment works is complex with a large number of input variables.  Also just want to check that you grasp the difference between a MBBR process and a MBR process, the 2 being quite different.  Furthermore just as there is a range of BNR activated sludge processes, so too there are a range of MBBR and MBR process configurations.  So to be able to answer your question with say 10 calculations is not possible.  Kim has referred to Metcalf and Eddy (the "Bible" of wastewater treatment), and this is a detailed book for the understanding and design of wastewater treatment works - but as Liang says - "will take a few years to get the point".  The main aspects of MBBR and MBR process configurations is that you can operate at higher MLSS concentrations or longer sludge age in the aeration basin, which then impacts on the aeration tank design (you also need diffused air aeration rather than mechanical aerators), RAS and WAS calculations.