If you really want to know how to design a Membrane BioReactor for a Waste Water Treatment Plant, why don't you ask in terms that most of us might understand such that we can do some research for you.
I have many contacts involved in this work. Many major firms (GE, Siemens) are getting involved in these activities. There seems to be much market interest. So, please share more about where you are, share information on your application, and we will be glad to help you.