The iPad can only use one AppleID at a time, so you will have to keep switching between AppleID's in the "Settings" app to see different PhotoStreams. This would be wasteful, since then you would to have to download the same PhotoStream over and over again from iCloud.
Why not use Shared PhotoStreams to separate your photos in two different streams? Does your Mac need the necessary requirements? (OS X Mountain Lion v10.8.2 with Photo 9.4 or later or Aperture 3.4 or later)