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• W3040808940 abstract "Abstract Membrane bioreactors (MBRs) for wastewater treatment show great potentials in the sustainable development of urban environments. However, fouling of membranes remains the largest challenge of MBR technology. Dissolved extracellular polymeric substances (EPS) are often assumed be the main foulant in MBRs. However, single bacterial cells are often erroneously measured as EPS in traditional spectrophotometric analysis of EPS in activated sludge, so we hypothesized that single cells in many cases could be the true foulants in MBRs for wastewater treatment. To study this, raw MBR sludge and sludge supernatant with varying concentrations of planktonic cells were filtered on microfiltration (MF) membranes, and we found a direct correlation between the cell count and rate of flux decline. Addition of planktonic cells to fresh MBR sludge dramatically increased the flux decline. The identity of the most abundant planktonic cells in a full‐scale MBR water resource recovery facility was determined by DNA fingerprinting. Many of these genera are known to be abundant in influent wastewater suggesting that the influent bacterial cells may have a direct effect on the fouling propensity in MBR systems. This new knowledge may lead to new anti‐fouling strategies targeting incoming planktonic bacteria from the wastewater feed. Practitioner points Planktonic cells constituted up to 60% of the total protein content of “soluble extracellular polymeric substances” in membrane bioreactor sludge. Planktonic cells are hidden under a surrogate concentration of extracellular polymeric substances which is often associated with fouling. Membrane fouling rate is directly proportional to amount of free planktonic cells suspended in sludge. Several influent bacterial genera are enriched in the water phase of membrane bioreactor sludge. Removing these may mitigate fouling." @default.
• W3040808940 created "2020-07-16" @default.
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• W3040808940 date "2020-07-29" @default.
• W3040808940 modified "2023-10-06" @default.
• W3040808940 title "Fouling of membranes in membrane bioreactors for wastewater treatment: Planktonic bacteria can have a significant contribution" @default.
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• W3040808940 doi "https://doi.org/10.1002/wer.1392" @default.
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