Design parameters for filter capacity

Abstract

<p>A kinetic equation based on the limited growth model was obtained by considering filtration mechanisms. The solution of the kinetic equation and material balance equation is relatively simple but successfully describes the breakthrough curves. In the two equations, the solids retention characteristics were described by the filter capacity, (sigma)(,u), and the attachment coefficient, K, and these parameters can easily be obtained by fitting a straight line to data obtained from pilot plant tests;In the filtration of a ferric hydroxide suspension, the filter capacity increased as the filtration rate increased and as the influent suspended solids concentration increased. The attachment coefficient increased as the filtration rate decreased and as the influent suspended solids concentration decreased. Increasing the filter capacity delays the beginning of the effluent degradation stage. As the attachment coefficient increases, the breakthrough curve also rises more and more steeply, but the time when the effluent suspended solids concentration has risen to half of the influent suspended solids concentration remains almost the same;Head loss through a filter depth can be expressed as some power of the total particle deposit in the filter. One of the head loss constants, a, increased as the filtration rate increased, as the influent concentration increased, and as the media size decreased. However, the other constant, b, remained relatively constant. Varying the filter depth appeared to have little effect on the head loss constants and attachment coefficient, but the filter capacity decreased as the filter depth increased.</p>