The Critical Flux Method for Reduced Filter Membrane Fouling when Monitoring High-Solids Digesters

Tait, Stephan ORCID: and Carney, Christopher R. and Batstone, Damien J. (2013) The Critical Flux Method for Reduced Filter Membrane Fouling when Monitoring High-Solids Digesters. Biotechnology Progress, 29 (4). pp. 1059-1063. ISSN 8756-7938


Membrane fouling currently makes filtration of high-solids anaerobic sludges difficult and this is discouraging online monitoring of volatile fatty acids and control of high-solids digesters. The present study tests the critical flux approach to reduce membrane fouling. Filtration tests are performed on two sludges, filtered via a side-stream off two full-scale digesters. Sub-critical flux operating conditions (for minimal cake layer formation) are identified for each of the sludges and the filtration units are operated at these conditions to assess longer term performance. Results for one of the sludges (co-digested primary and secondary sludge) is found to be encouraging, showing that sufficient flux rates (up to 40 L m-2 h-1) can be readily sustained to allow longer term digester monitoring and control. Filtration performance for this sludge did not deteriorate significantly over the test period. Results for the other test sludge (digested thermally hydrolyzed waste activated sludge) were not as favorable and indicated that application may be limited for very high solids digesters (>5% total solids concentration). Differences in filtration behavior for the two test sludges were ascribed to the presence of complex soluble organics, the concentration of sludge solids and their particle size.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 17 Feb 2022 04:07
Last Modified: 17 Feb 2022 04:07
Uncontrolled Keywords: Anaerobic digestion; Critical flux; Filtration; Monitoring and control
Fields of Research (2008): 09 Engineering > 0907 Environmental Engineering > 090703 Environmental Technologies
Fields of Research (2020): 40 ENGINEERING > 4004 Chemical engineering > 400410 Wastewater treatment processes
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