2. Bag filter + Wet Scrubber system - This combination is not at all suggestible // advisable. You are already informed that Bag Filter is capable of guaranteeing very low emission but it is a completely dry process as filter fabric is mostly allergic to high moisture.
Wet scrubber requires some kind of chemical fluid (mostly water or others) but this is used independently (mostly in case of acid treatment plants) with special Material of Construction.