a study on the performance of limestone roughing filter - ePrints@USM
a study on the performance of limestone roughing filter - ePrints@USM
a study on the performance of limestone roughing filter - ePrints@USM
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discuss in detail, <strong>the</strong> reas<strong>on</strong> might be that <strong>the</strong>y used large size <strong>filter</strong> media in <strong>the</strong><br />
experiment.<br />
Lin et al., (2006) indicated that improved cumulative removal efficiencies are<br />
typically correlated to l<strong>on</strong>ger <strong>filter</strong> lengths at <strong>the</strong> expense <strong>of</strong> pressure drop. Without<br />
affecting <strong>the</strong> removal efficiency, <strong>the</strong> <strong>filter</strong> length and thus <strong>the</strong> pressure drop can be<br />
reduced with <strong>the</strong> use <strong>of</strong> multiple media sizes, as illustrated in Figure 2.7. The larger<br />
solids particles are removed by coarse media, medium size <strong>filter</strong> media can polish and<br />
<strong>the</strong> finest media could remove <strong>the</strong> remaining traces <strong>of</strong> solid matters (Wegelin, 1996).<br />
Figure 2. 7 : Significance <strong>of</strong> Turbidity Reducti<strong>on</strong> al<strong>on</strong>g Roughing Filter Length (Source :<br />
Wegelin, 1996)<br />
Removal <strong>of</strong> particulate matters in <strong>roughing</strong> <strong>filter</strong> is also dependent <strong>on</strong> raw water<br />
characteristics. Thus, it is important to <str<strong>on</strong>g>study</str<strong>on</strong>g> <strong>the</strong> characteristics <strong>of</strong> <strong>the</strong> given source <strong>of</strong><br />
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