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MembraneManuscriptPattonSp09

MembraneManuscriptPattonSp09 - Using Labview to Study the...

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Using Labview to Study the Internal Resistance of Ultrafiltration Membranes and Membrane Fouling Deric C. Patton Department of Civil and Environmental Engineering, Michigan State University, East Lansing, MI 48824,  USA Abstract In   order   to  learn   more   about   Labview   software   and   membrane   filtration,   a   Labview   project   was  constructed and the internal resistance of an ultrafiltration membrane was found to be 1.04x10 13  m -1  through a  clean water resistance test.  A fouling test was also conducted to explore the membrane’s tendency to foul  which proved to be difficult.   Despite the use of turbid water, the flux only dropped 15 percent from the initial  flux over the course of six hours at a constant pressure of 40 PSI.   These experiments demonstrate the  physical properties of membrane filtration and the ability of Labview to facilitate the process of investigating  these properties. 1. Introduction Membrane filtration has long been accepted  as   an   effective   method   of   removing   unwanted  particles from a fluid.  Membrane filtration works by  only   allowing   particles   to   pass   that   are   small  enough   to   fit   through   the   membrane   pores.  Membrane pore size is typically given in molecular  weight  cut-off  (MWCO)  and,  as such,  molecules  with molecular weights higher than this value are  simply   too   big   to   fit   through   the   pores   and   are  retained by the filter.  As pore size decreases, the  internal resistance of a membrane increases.  This  is   called   the   intrinsic   internal   resistance   of   a  membrane. In this experiment,  Labview  software was  used  to  investigate  the  internal resistance  of  an  ultrafiltration membrane in dead-end operation, in  which the flow is perpendicular to the membrane  surface.  Dead-end operation was used as this has 
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