After the fold your opponent cards' semms like a straight draw (wrap or OESD), something like TQ9x or TQxx, but u have the blockers so if i had to bet I'd said he has something like top 2 pair KJxx or AKxx (TPTK) 

At this level if he has a flush I think he's never folding in the turn, but who knows, he hasn't the second nuts cause you have the Q, but after he calls a 2.55 bet  I think he never folds his flushes.(nor any hand)

 I think he can't have a set cause in the turn the pot odds are 1,6 to 9,29  so he needs 17% equity , and if he has a set he has 9/44=20% (drawing to full) so he's comitted, and if he folds he's doing a big mistake.

I'd say that the hand is horrible played by your opponent, in the turn he can't fold  after invest 3/4 of his stack. And if he can't fold his best option is betting the rest of his stack.

In the flop with two pair his best option is bet-folding after your raise in a heavy wet board. And perhaps with a set a valid option is check calling and bettting pot in the turn after a blank, the problem is that  there aren't many bllanks.