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• W3048299577 startingPage "116289" @default.
• W3048299577 abstract "• Predation greatly increases the porosity of MABR biofilms. • Increased porosity weakens the mechanical strength of biofilm. • The biofilms had much greater detachment than controls without predation. The membrane-aerated biofilm reactor (MABR) is an emerging wastewater treatment technology that uses O 2 -supplying membranes as a biofilm support. Because O 2 is supplied from the biofilm base instead of the bulk liquid, MABR biofilms have distinct microbial community structures and behavior. Past research showed that protozoan predation in MABR biofilms can greatly increase biofilm porosity, producing a void layer at the base of the biofilm. We hypothesized that this void layer could weaken the biofilm and promote sloughing, and investigated this with heterotrophic MABR biofilms. A rheometer was used to measure biofilm mechanical strength, and MABR flow cells were used to explore detachment. MABRs supplied with cycloheximide, a protozoan inhibitor, were used as controls. Predation increased the internal void ratio from 6 ± 7% to 50 ± 16%. The storage modulus was 1,780 ± 1,180 Pa with predation condition, compared to 9,800 ± 4,290 Pa for the control. Similarly, the loss modulus was 1,580 ± 729 Pa with predation and 363 ± 189 Pa for the control. When subjected to an increased flow, the biofilm loss was 44 ± 24% for the flow cell with predation, while only 7 ± 9% for the control. This research shows that predation can have an important impact on biofilm porosity in MABRs, reducing the mechanical strength and increasing detachment. Understanding this phenomenon can help develop more effective biofilm control strategies in MABRs." @default.
• W3048299577 created "2020-08-13" @default.
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• W3048299577 date "2020-11-01" @default.
• W3048299577 modified "2023-10-10" @default.
• W3048299577 title "Effect of predation on the mechanical properties and detachment of MABR biofilms" @default.
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• W3048299577 doi "https://doi.org/10.1016/j.watres.2020.116289" @default.
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