Patent ID: 8148699

Claim:
A fluid treatment system comprising: an inlet; an outlet; a fluid treatment zone disposed between the inlet and the outlet, the fluid treatment zone having disposed therein: (i) an elongate first radiation source assembly having a first longitudinal axis, and (ii) an elongate second radiation source assembly having a second longitudinal axis; wherein the first longitudinal axis and the second longitudinal axis are non-parallel to each other and to a direction of fluid flow through the fluid treatment zone, and wherein the first radiation source assembly and the second radiation source assembly are oriented such that the first longitudinal axis and the second longitudinal axis converge toward the inlet, further comprising: (i) a first transition zone interposed between the inlet and the fluid treatment zone, the first transition zone having a variable dimension orthogonal to the direction of fluid flow through the fluid treatment zone, and (ii) a second transition zone interposed between the fluid zone and the outlet, the second transition zone having a variable dimension orthogonal to the direction of fluid flow through the fluid treatment zone.