water treatment assignments

I am starting to dream about water treatment plants. How to size them? what treatment systems to use? how much do they cost?

For my undergrad course we have to design a water treatment plant - which maybe doesn't sound so bad but is actually pretty tricky, especially since I did not understand the sizing question on the last assignment.

For my grad course we are supposed to write a critique on a journal article related to innnovations in filter backwash..... The assumption is that I would know enough to be able to critique it I guess. It is due tomorrow at 4 and I am trying to figure out which paper to review: the one on filter backwash and ultrafiltration technology, filter backwash for reuse using microfiltration, treatment of backwash filter water using dissolved air flotation or my favourite title Variations in backwash efficiency during colloidal filtration of hollow-fibre microfiltration membranes.