An MBR process is simply activated sludge, in some configuration, with membranes as the solids separation device. Color removal in any activated sludge process is much more dependent on the effectiveness of the activated sludge process than on the solids separation device. An effective activated sludge process will remove most color biochemically. If the final barrier to color removal is a membrane, there is quite a range of color-causing compounds that will pass through a typical MBR membrane (many synthetic dyes and tannins, for instance). An effective MBR will produce reuse-quality water but there are many other ways to produce equivalent quality.