Abstract
A great number of models proposed in the literature that describe permeate flux decline with time in ultrafiltration can be linearized to obtain an equation expressed in terms of transmembrane pressure (TMP) divided by permeate flux, ΔP2/J2P, as a function of time. In this work, experimental results from pilot plant ultrafiltration tests are expressed in terms of DP2/J2P vs. time to check their linearity. Regression analysis allowed the determination of the quotient: specific resistance of the gel layer/ gel layer concentration (rc/Cg). Ultrafiltration tests were performed at constant temperature (25°C) and feed concentration (5 g/L) at different feed flow rates (1–3 m/s) and transmembrane pressures (0.1–0.4 MPa) with monotubular ZrO2-TiO2 (molecular weight cut-off: 15 kg/mol) and aqueous solutions of polyethylene glycol (PEG) of 35,000 g/mol.
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