Patent ID: 7682509

Claim:
A trap for removing buoyant material from fluid, the trap comprising: a treatment tank comprising a base wall and a vertically-extending sidewall; a feed pipe adapted to introduce a fluid flow at a first location in the treatment tank; an exit pipe adapted to remove at least a portion of the fluid flow from a second location in the treatment tank; and one or more wall structures adapted to form a circuitous passage, with respect to a horizontal plane, between the first location and the second location, the one or more wall structures extending from the base wall to a point below the sidewall and being open at a top end thereof, thereby substantially preventing the fluid flow from passing below the circuitous passage, but allowing buoyant material in the fluid flow to rise above the circuitous passage, wherein the circuitous passage has a generally constant width from the first location to the second location, the width being approximately equal to a width of the feed pipe; wherein the one or more wall structures are removably installed in the treatment tank such that the one or more wall structures can be lifted out of the treatment tank to facilitate cleaning.