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Experimental results are presented for a two-fiber, bench-scale test that wasdesigned to evaluate the effect of setpoint flux, backwash frequency and backwash time onlong-term fouling rate of low-pressure membrane systems. In this study, an ultrafiltration(UF) membrane was used to treat granular-media filtered, secondary wastewater effluent.The fouling rate as measured by the decline in specific flux over many backwash cycleswas disproportionately lower for a lower setpoint flux (50 vs. 65 L/msup2/sup/h) and higherbackwashing frequency (10 vs. 15 min). The increase in backwash time (1 min vs. 30 s)did not influence the removal of membrane pore blockage but reduced the rate of cake layerformation significantly on membrane surface. However, this effect was larger at the lowersetpoint flux. The comparison of bench-scale and pilot-scale test also shows that the two-fiber,bench-scale test is a very useful, first-cut approach for acquiring process designinformation for pilot- and full-scale operation. Includes 10 references, figures.

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Edition: Vol. - No. Published: 03/01/2005 Number of Pages: 11File Size: 1 file , 390 KB