Abstract
This study investigated the vibration pattern of flat membrane modules used in submerged MBRs by a laser displacement meter. The supporting plates of the membrane modules showed repeated expansion and contraction behaviors during aeration. Fluctuation of the displacement of the supporting plates increased with increasing air flow flux. Vibration cycle of the supporting plates was dependent on the characteristic vibration of the plate. Variation intensity and displacement length of the supporting plates increased with increasing air flux rate, and were found to be dependent on the thickness of the supporting plates. Vibration pattern of the membrane sheet was found to show irregular vibration patterns.
