QJo from the SB flops trips--why is he raising the river?

[bdk3clash]

The button in this hand appears to call one bet preflop no matter what. Let's label him a loose-passive calling station.

How's my play on each street? What's your move on the river?

Party Poker 2/4 (10 handed)
bdk3clash has J[img]/images/graemlins/diamond.gif[/img], Q[img]/images/graemlins/spade.gif[/img] and is SB

UTG limps, EP2 limps, Button limps, bdk3clash limps, BB checks

Flop(5 SB): A[img]/images/graemlins/heart.gif[/img], Q[img]/images/graemlins/diamond.gif[/img], Q[img]/images/graemlins/club.gif[/img]

bdk3clash bets, BB folds, UTG folds, EP2 folds, Button calls

Turn(3 1/2 BB): 3[img]/images/graemlins/spade.gif[/img]

bdk3clash bets, Button raises, bdk3clash 3-bets, Button calls

River(9 1/2 BB): 4[img]/images/graemlins/heart.gif[/img]

bdk3clash bets, Button raises, bdk3clash...

[Dynasty]

Go ahead and 3-bet again while hoping he doesn't have Q4.

[bdk3clash]

I called. He had Q9. Grrr.