lamp cover tubes individually indicated by a wire frame graphic the uv lamp cover tubes are arranged in a cross flow orientation and lie in one plane in line with the main flow direction within the uv treatment chamber inside each of the cover tubes a uv lamp for decontamination of the overflow stream passing through the uv treatment chamber is located flow direction in fig4 a is from the front right end of the uv treatment chamber to the back left end of the uv treatment chamber the reorientation vanes are located between the second and third uv lamp cover tube counted in main flow direction the vanes 39 outermost edges touch the inside wall of the uv treatment chamber in operation the reorientation vanes rotate the flow pattern in the uv treatment chamber by approximately 90 u00b0 this can be best seen in fig4 b and 4 c respectively both figures show a side view of the uv treatment chamber of fig4 a along the plane of uv lamp cover tubes particle flow is from left to right in both figures fig4 b shows traces of particles flowing into the uv treatment chamber on a plane u201c entry plane u201d perpendicular to that of the uv lamp cover tubes the particle traces are divided by the left most upstream uv lamp cover tube while an.