Activated sludge taken from a real scale parallel lines (equipped either with conventional settling tank or with a hollow fiber ultrafiltration membrane unit) was monitored. Microfauna (Protozoa and Metazoa) was analysed accordingly with Madoni method or the calculation of S.B.I. (Sludge Biotic Index). Flocs size and features were recorded and filamentous bacteria were identified while estimating their abundance. Process efficiency in terms of organic substance degradation and nitrogen removal was plotted versus biological data, in order to compare lines behavior. Furthermore, based on such findings, the applicability of S.B.I. to a MBR plant was evaluated. Class quality criterion resulted still valid, but further investigations should be required in order to attribute a proper meaning to the number of taxa as well as to the ratio between crawling and attached Ciliates. Flocs size was higher in case of MBR plant, unlike most literature data; likewise, filamentous Bacteria outnumbered with respect to the conventional line fitted out with the settling tank.
Activated sludge monitoring in a real scale MBR (Membrane BioReactor) plant
PEDRAZZANI, Roberta
2014-01-01
Abstract
Activated sludge taken from a real scale parallel lines (equipped either with conventional settling tank or with a hollow fiber ultrafiltration membrane unit) was monitored. Microfauna (Protozoa and Metazoa) was analysed accordingly with Madoni method or the calculation of S.B.I. (Sludge Biotic Index). Flocs size and features were recorded and filamentous bacteria were identified while estimating their abundance. Process efficiency in terms of organic substance degradation and nitrogen removal was plotted versus biological data, in order to compare lines behavior. Furthermore, based on such findings, the applicability of S.B.I. to a MBR plant was evaluated. Class quality criterion resulted still valid, but further investigations should be required in order to attribute a proper meaning to the number of taxa as well as to the ratio between crawling and attached Ciliates. Flocs size was higher in case of MBR plant, unlike most literature data; likewise, filamentous Bacteria outnumbered with respect to the conventional line fitted out with the settling tank.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
