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A rapid small scale evaluation of ultrafiltration performance for surface water treatment at Alcantarilha’s WTW (Algarve, Portugal)
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Advisor(s)
Abstract(s)
A rapid small scale evaluation of ultrafiltration (UF) performance with and without physicalchemical
pre-treatment was performed to up-grade the conventional treatment used for drinking water
production in Alcantarilha’s WTW, Algarve, Portugal. Direct UF and pre-ozonation/ coagulation/
flocculation/ sedimentation/ UF (O/C/F/S/UF) were evaluated using polysulphone membranes of
different apparent molecular weight cut-off (MWCO) (15-47 kDa). The results indicated that (i) UF is an
effective barrier against microorganisms, including virus larger than 80 nm; (ii) for surface waters with
low to moderate SUVA values, direct UF performance is equivalent or better than the conventional
treatment in terms of residual turbidity, while UV254nm and TOC residuals require the use of O/C/F/S/UF;
(iii) the permeate quality improves with the membrane apparent MWCO decrease, especially for the
direct UF, although the conventional treatment performance is never reached using UF; (iv) membrane
fouling and adsorption phenomena are more severe in direct UF than in O/C/F/S/UF sequence (preozonation
decreases the membrane foulants by decreasing their hydrophobicity) and these phenomena
increase with the membrane hydraulic permeability and, particularly, with the membrane apparent
MWCO.
Description
Keywords
Drinking water Ultrafiltration Turbidity NOM
Citation
Margarida Ribau Teixeira; Lucas, Helena; Rosa, Maria João. A rapid small scale evaluation of ultrafiltration performance for surface water treatment at Alcantarilha’s WTW (Algarve, Portugal). Trabalho apresentado em 4th World Water Congress. In Proceedings of the 4th World Water Congress, Marrakech, 2004.