Date Received: 05-06-2025
Date Published: 13-06-2025
##submissions.doi##: https://doi.org/10.31817/tckhnnvn.2012.10.1.
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Effects of Aeration Intensity on Membrane Fouling in A Membrane Bioreactor Treating Domestic Wastewater
,
Ick T. Yeom
Keywords
Aeration intensity, cross flow velocity, membrane fouling, wastewater
Abstract
Membrane fouling is one of the great challenges for application of membrane bioreactor technology to wastewater treatment. Aeration system is a key factor to avoid the sludge cumulated on the membrane surface. The effects of aeration intensity on the cross flow velocity and membrane fouling were determined in this study. As a result, the cross flow velocity was increased with increasing in aeration intensity. When aeration intensity was increased from 0.014 to 0.069 L/cm2/min, the cross flow velocity was increased rapidly. However, it was almost unchanged when aeration intensity was higher than 0.069 L/cm2/min. The transmembrane pressure was also increased quickly when the cross flow velocity was lower than the critical velocity (30.5 cm/s). When the cross flow velocity was higher than 30.5 cm/s, the transmembrane pressure was increased negligible. Therefore, the air flowrate should be controlled to make sure the cross flow velocity to be higher than the critical value. This will prevent the membrane fouling and help the system to be operated longer.
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