My comment above should read:
"You are probably going to need a lot more area or a lower loading rate if most of your droplets are a lot smaller than 60 micron."
I would agree with bimr comment on design and construction of such a unit. Buy one off the shelf if you can. But look at the plate area, flow rates, removal efficiencies, acceptable solids loading etc of the units you are considering.
Regards
Ashtree
"Any water can be made potable if you filter it through enough money"