Compact membrane-based heat and mass exchanger

A membrane-based heat and mass exchanger, comprising:

• a plurality of identically structured slats, each slat comprising at least one membrane support structure, a plurality of grooves, at least one first inlet port and one first outlet port for a first fluid, and at least one second inlet port and at least one second outlet port for a second fluid;
• a plurality of O-rings or gaskets shaped to match the plurality of grooves, wherein the slats are aligned;
• a plurality of selective membranes;
• and
• a plurality of bolts or clamps for compressing the plurality of slats and the selective membranes into an assembly of slats, wherein a front face of the slats are contacted with the front face of the adjacent slat and a back face of slats are contacted with the back face of the adjacent slat such that the groves align the slats to restrict the first fluid to the front face and restrict the second fluid to the back face or restrict the second fluid to the front face and restrict the first fluid to the back face.