Pore blocking mechanism for the recovery of milk solids from dairy wastewater by ultrafiltration

Abstract

-This paper evaluates the pore blocking mechanism of two ultrafiltration membranes with different geometries (tubular and spiral wound) when dairy wash water is filtered. The work evaluated the effect of transmembrane pressure and the cross-flow velocity with a 3 2 experimental design using classical Hermia's models and the resistance-in-series model. The resistance-in-series analysis identified external fouling on the surface of both membranes, but the tubular membrane showed higher reversible fouling, while the reversible and irreversible resistances of the spiral wound membrane averaged 41% and 45%, respectively. Cake formation is the model that best represents ultrafiltration in the spiral wound membrane at all transmembrane pressures and cross-flow velocities. In the tubular membrane, at the lowest cross-flow velocity (0.79 m.s -1 ), the cake formation model fitted the experimental data best. However, at higher cross-flow velocities (1.42 and 2.23 m.s -1 ), the best fit of flux data was obtained with the complete pore blocking model. In addition, the tubular membrane apparently had a two-step pore blocking: "pore blocking" as the initial governing mechanism followed by "cake formation".

Preparation and Performance Studies on Polyethersulfone Ultrafiltration Membranes Modified With Gelatin for Treatment of Tannery and Distillery Wastewater

“…PES UF flat membranes on the industrial scale are considered to be technically and economical feasible for treatment of leather and distillery effluents (Huang et al, 1994). Ultrafiltration has wide application in the recovery of milk solids (Briao and Tavares, 2012) and disposal of effluents from dairy waste water (Namvar Mahboub and Pakizeh, 2012). Therefore, polymers are the most important materials economically available to prepare membranes that can be prepared over a wide range of film-forming options and modified to achieve tailored properties.…”

<b>Cake formation and the decreased performance of whey ultrafiltration

“…The constants of each pore blocking mechanism were estimated according to the four optimization runs performed sequentially for each operating condition (using the set J x t). Details can be found in Brião and Tavares (2012).…”

“…In addition, it was calculated the filtration resistance according the Darcy's Law (Equation 5) for laminar flow in the membrane pores as found elsewhere (Aydiner, Kaya, Gönder, & Vergili, 2010, Brião & Tavares, 2012, Baklouti, Kamoun, Ellouze-Ghorbel, & Chaabouni, 2013. The permeate viscosity was estimated as the water viscosity (0.001 Pa s).…”

Food‐Processing Wastes

“…The pore blocking mechanism of two UF membranes with different geometrics was evaluated for dairy wash water. The best fit of flux data was obtained 1503 Water Environment Research, Volume 85, Number 10-Copyright © 2013 Water Environment Federation with the complete pore blocking model (Briao and Tavares, 2012). Luo et.…”