Full Description

Presently, monitoring membrane integrity is carried out in one of two ways. Thefirst is to try and measure a property inherent to the membrane in an attempt todiagnose its integrity. The second is to measure the quality of the permeatewater and to use that as an indicator of membrane integrity. The primary means ofmeasuring the membrane directly is the pressure decay test (PDT). The membrane isdrained, and then, either the feed, or the permeate side is pressurized with air.The rate of pressure decay under conditions of a compromised membrane is greaterthan when the membrane is intact. There are however, a few problems with thistechnique. It requires a membrane rack to be taken off line and therefore thefrequency of integrity testing is severely limited by practicality. Also, certainmembranes will experience some pressure decay, even when the membrane is known tonot suffer from integrity issues. Measuring the particle content of permeatewater is done using turbidimeters, laser turbidimeters and particle counters.Typically, one turbidimeter (or a laser turbidimeter) and one particle counter(

Product Details

Edition: Vol. - No. Published: 05/01/2001 Number of Pages: 4File Size: 1 file , 180 KB