downstream

in membrane processes
https://doi.org/10.1351/goldbook.DT06874
Side of a membrane from which permeate emerges.
Source:
PAC, 1996, 68, 1479. 'Terminology for membranes and membrane processes (IUPAC Recommendations 1996)' on page 1482 (https://doi.org/10.1351/pac199668071479)