AWWA MTC64620

A series of studies are currently being undertaken to develop a model that can be used toaccurately predict the evolution of the trans-membrane pressure over time in a full-scalesubmerged membrane system. These studies investigate the effects of the hydrodynamicconditions and the configuration of submerged hollow fiber membrane systems onmembrane fouling. The results from one of these studies indicated that the increase in thetrans-membrane pressure during one filtration cycle, could be modeled using a relativelysimple exponential relationship that was a function of reversible and irreversible foulingcoefficients. The present study was undertaken to determine if this exponentialrelationship could be used to accurately describe the evolution of the trans-membranepressure in a submerged membrane system during successive filtration cycles.The fraction of the total fouling that was initially defined as reversible (i.e. defined by areversible fouling coefficient) could consolidate and produce irreversible fouling overtime. The extent of consolidation appeared to be directly related to the duration of afiltration cycle (i.e. time between maintenance cleaning cycles). For relatively shortfiltration cycles, the extent of consolidation was negligible. Therefore, when a membranesystem was operated with relatively short filtration cycles, the evolution in the transmembranepressure over time could be modeled using a relatively simple exponentialrelationship that is a function of three parameters: the pseudo-steady-state permeate flux(JSS), an irreversible fouling coefficient (KI) and a reversible fouling constant (kr).Additional studies are currently being conducted to investigate the effects of different rawwater sources on the parameters (i.e. JSS, KI, and kr) that describe the evolution in thetrans-membrane pressure over time in submerged membrane systems. Includes 12 references, tables, figures.

Product Details

Edition:

Vol. - No.

Published:

03/01/2007

Number of Pages:

12

File Size:

1 file