Foaming in membrane bioreactor: identification of thecauses

Research output: Contribution to conferenceOther

Abstract

The biological foaming was related to the metabolism of certain microorganisms that synthesizeand excrete hydrophobic compounds. Recently, by the attention of many researchers the biologicalfoaming in the MBR has attracted, because MBR foam has been also observed in the absence offoam-forming microorganisms, contrarily to conventional activated sludge systems. In this paperthe authors investigate the role of EPS and filamentous bacteria analyzing different samples fromdifferent MBR pilot plants. In particular, in order to define the macroscopic features and the roleof EPS and filamentous bacteria a modified Scum Index (MSI) test was applied. Further a multipleclassification of SI was proposed, relating to effect of EPS or filamentous bacteria. The causes ofbiological foaming were identified in terms of foaming potential, foam quality and quantity,basing on the modified Scum Index and Foam Power test.
Original languageEnglish
Number of pages8
Publication statusPublished - 2012

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