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The operation of full-scale MBR systems are typically done with MLSS concentrations
in the range of 8 to 18 g/L (Drews 2010). Among the two common practices in the
operation of the MBR systems, one is to keep the MLSS concentration fixed more or
less around a certain value which, however, needs frequent removal of excess sludge or
activated sludge from the mixed liquor to avoid any instability in the operation of
treatment such as to avoid the rapid rise of TMP. In the continuously operated MBR
systems without sludge removal, the concentration of MLSS often increases steadily in The operation of full-scale MBR systems are typically done with MLSS concentrations
in the range of 8 to 18 g/L (Drews 2010). Among the two common practices in the
operation of the MBR systems, one is to keep the MLSS concentration fixed more or
less around a certain value which, however, needs frequent removal of excess sludge or
activated sludge from the mixed liquor to avoid any instability in the operation of
treatment such as to avoid the rapid rise of TMP. In the continuously operated MBR
systems without sludge removal, the concentration of MLSS often increases steadily in
most of the MBR systems depending on the feed characteristics and microbes present in
the sludge (Hernandez et al., 2015). From the operational point of view, the latter
practice of the MBR operation may offer advantages, for example it may promote more
nitrification process due to the development of nitrifying bacterial community in the
increased MLSS concentration (Kornboonraksha and Lee, 2009). Nevertheless, the
excess activated sludge may need to be withdrawn in the continuously operated MBR
systems to maintain its operation for longer term or to avoid any sudden instability in its
operation. In a study of an MBR system for treating domestic wastewater, Hasar et al.(
2002) had to withdraw sludge in two stages to sustain stability in the operation of the
system as the MLSS steadily increased to much higher value resulting in rapid rise of
TMP. A continuously operated MBR was studied in this research but a small portion of
sludge was withdrawn after 32 days of operation to avoid rapid rise in TMP.
The operation of full-scale MBR systems are typically done with MLSS concentrations
in the range of 8 to 18 g/L (Drews 2010). Among the two common practices in the
operation of the MBR systems, one is to keep the MLSS concentration fixed more or
less around a certain value which, however, needs frequent removal of excess sludge or
activated sludge from the mixed liquor to avoid any instability in the operation of
treatment such as to avoid the rapid rise of TMP. In the continuously operated MBR
systems without sludge removal, the concentration of MLSS often increases steadily in The operation of full-scale MBR systems are typically done with MLSS concentrations
in the range of 8 to 18 g/L (Drews 2010). Among the two common practices in the
operation of the MBR systems, one is to keep the MLSS concentration fixed more or
less around a certain value which, however, needs frequent removal of excess sludge or
activated sludge from the mixed liquor to avoid any instability in the operation of
treatment such as to avoid the rapid rise of TMP. In the continuously operated MBR
systems without sludge removal, the concentration of MLSS often increases steadily in
most of the MBR systems depending on the feed characteristics and microbes present in
the sludge (Hernandez et al., 2015). From the operational point of view, the latter
practice of the MBR operation may offer advantages, for example it may promote more
nitrification process due to the development of nitrifying bacterial community in the
increased MLSS concentration (Kornboonraksha and Lee, 2009). Nevertheless, the
excess activated sludge may need to be withdrawn in the continuously operated MBR
systems to maintain its operation for longer term or to avoid any sudden instability in its
operation. In a study of an MBR system for treating domestic wastewater, Hasar et al.(
2002) had to withdraw sludge in two stages to sustain stability in the operation of the
system as the MLSS steadily increased to much higher value resulting in rapid rise of
TMP. A continuously operated MBR was studied in this research but a small portion of
sludge was withdrawn after 32 days of operation to avoid rapid rise in TMP.
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