We claim the ornamental design for a membrane filtration module, as shown and described.
FIG. 1 is a partial exploded isometric view;
FIG. 2 is a side elevation view;
FIG. 3 is a front elevation view;
FIG. 4 is a plan view from the top; and,
FIG. 5 is a plan view from the bottom.
The membrane filtration module is shown with a symbolic break in its length. The appearance of any portion of the article between the break lines forms no part of the claimed design. The dot-dash lines shown in FIGS. 3-5 indicate a boundary and form no part of the claimed design. The dash-dash lines in FIGS. 1-5 indicate portions of the article that form no part of the claimed design.