![]() ![]() Most flow-enhanced filters are single-membrane designs. However, membrane thickness affects the filter’s retentivity a membrane that is too thin might allow organism penetration. For example, flow rate can be enhanced by altering membrane thickness the thinner the membrane, the lower the flow resistance and thus, the higher the flow rate. There is limited flexibility in membrane configuration, however. A membrane’s design determines its porosity, thickness, and pore structure (6). For example, it is generally not possible to double the flow rate by increasing the filtration area. Doing so may increase the cost per liter of filtered volume, however, and increasing the pleat density of a filter often does not achieve the required filter area. Another way to achieve an optimal flow rate is to increase the filtration area. Figure 1 shows such damage on the outer pleat-edge of a membrane that had instabilities due to its membrane design and pleatability (8).įiltration area. If the operating pressures are too high-specifically if the filtration process stops frequently (i.e., in pulsating applications)-the filter membrane can be damaged. Before doing this, however, maximum operating pressures must be considered. One way to increase a filter’s flow rate is to raise the differential pressure over the membrane.
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