A weird hand (15/30 LO8)

[donger]

Poker Stars
Limit Omaha Ring game
Limit: $15/$30
10 players
Converter

Pre-flop: (10 players) Donger is UTG+2 with A[img]/images/graemlins/heart.gif[/img] Q[img]/images/graemlins/spade.gif[/img] 3[img]/images/graemlins/diamond.gif[/img] 6[img]/images/graemlins/heart.gif[/img]
2 folds, Donger calls, 5 folds, SB calls, BB checks.

Flop: 7[img]/images/graemlins/spade.gif[/img] K[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/heart.gif[/img] (3SB, 3 players)
SB checks, BB checks, <font color="#cc0000">Donger bets</font>, SB folds, BB calls.

Turn: A[img]/images/graemlins/diamond.gif[/img] (2.5BB, 2 players)
BB checks, Donger checks.

River: A[img]/images/graemlins/spade.gif[/img] (2.5BB, 2 players)
<font color="#cc0000">BB bets</font>...

I had no idea how this guy plays, so let's assume he's bad. Is there value in raise/folding this river? I have basically the nut trips and am only behind K7/77/AK. I feel like this guy slowplayed himself into a corner (with some sort of Kxxx here and didn't really count on my turn check and may be betting out of frustration and confusion.