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Treatment Run Length <br /> As described in the Ion Exchange Process section, the exchange process <br /> removes undesirable chemicals by filling available exchange sites in the <br /> ion exchanger. The quantity of chemicals that can be removed depends on <br /> the number of exchange sites on each resin bead and the number of resin <br /> beads in the exchanger system. The amount of chemical that can be reliably <br /> and consistently removed by each cubic foot of resin has been measured <br /> through laboratory testing of the exchanger system. <br /> The length of time the treatment plant can run before regeneration is <br /> needed is inversely related to the concentration of the chemicals in the <br /> water bean treated; that is the higher the influent concentration, the <br /> shorter the treatment plant run. Typical treatment plant runs determined <br /> from laboratory data are indicated in Figure 7 for various influent hexa- <br /> valent chromium concentrations. As indicated in Figure 7, the minimum <br /> system effluent concentration feasible is limited by the minimum concen- <br /> tration needed to drive the process. <br /> During the initial start-up period, liquids will be treated and held <br /> for testing. The treated liquids will be sampled and analyzed for the <br /> presence of wood treating chemicals. Through treatment and testing of a <br /> number of batches of water, the ion exchange system's performance charac- <br /> teristics will be confirmed. Based on the system's performance and the <br /> known quality of influent water, the quantity of water which can be treated <br /> before regeneration can be pre-determined. An automatic totalizer will be <br /> used after the start-up period to shut the system down (normal shutdown) <br /> when a conservative percentage of the pre-determined treatment quantity is <br /> processed. The plant operator will be alerted of the normal shutdown. In <br /> S6 5 <br /> HII <br />