Anaerobic membrane bioreactors for digestion of WAS: Short term membrane fouling tests
Abstract:This paper examines the impact of: membrane charge, feed concentration, operational flux and filtration time on membrane fouling when treating digested WAS. The study employed a short term filtration technique using a bench scale tubular ultra-filtration membrane operating at a cross-flow velocity of 1.4 m/s. The results showed that the effect of feed concentration and membrane charge on membrane fouling were a function of the operating flux region. When treating a low and high concentration digested sludge, a sustainable flux of 30 LMH was obtained by applying trans-membrane pressures of 5.4 and 13; and 8.6 and 40 KPa for negative and neutral charged membranes, respectively. Preliminary fractionation tests and geochemical modeling suggest that decline in filtration performance to be associated with the supernatant fraction of the sludge and iron-based precipitates such as siderite, pyrite and vivianite. In comparison to continuous operation, intermittent operation of the membrane achieved sustained operation with reduced membrane fouling.
Document Type: Research Article
Publication date: 2008-01-01
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