The ornamental design for a diffusionplate for oxygenationtreatment of sludge or the like, as shown and described.
FIG. 1 is a top plan view of a diffusion plate for oxygenation treatment
of sludge or the like showing my new design;
FIG. 2 is a side elevational view thereof;
FIG. 3 is another side elevational view thereof, taken from a position
ninety degrees from that of FIG. 2;
FIG. 4 is a bottom plan view thereof; and
FIG. 5 is a perspective view thereof, the broken line representation of
additional diffusion plates and a distribution pipe is for purposes of
illustration only.