Membranes from GE Osmonics (i.e., GE, GK and GH) presented
high permeate fluxes, considering their relatively low nominal
MWCOs, compared with the MICRODYN-NADIR membranes (UPand
UH-), which have much higher nominal MWCOs. For example, a
thin-film membrane (GH) from GE Osmonics, with a 1-kDa MWCO,
presented a very high permeation flux at 2 MPa (34.8 kg h−1 m−2),
whereas a polyethersulfone MICRODYN-NADIR membrane with a 50-
kDa MWCO (UH 050) presented one of the lowest of all permeation
fluxes (20.4 kg h−1 m−2) under the same conditions. This result
shows that, not only does transmembrane pressure affect permeate
flux, but it also affects the membrane material and structure, and the
interactions between solute and membrane.