Laserfiche WebLink
run, the active zone moves down the bed as the exhausted zone expands and <br /> the reserve zone recedes. When the reserve zone is nearly depleted, the <br /> treatment run is terminated and the exchangers are regenerated. Figure 4 <br /> indicates the relative depths of the various zones in the exchangers prior <br /> to treatment run termination. <br /> Three ion exchangers are being provided at the MCTC site: two anion <br /> exchangers designed to remove the negatively charged chemicals; and one <br /> cation exchanger designed to remove the positively charged chemicals. The <br /> cation exchange and regeneration is similar to the anion operations <br /> described above and depicted in Figures 1, 2 and 3. <br /> The effluent leaving the exchangers contains the exchange ions from <br /> both the anion and cation exchangers, but the wood treating chemicals have <br /> been electrochemically bonded to the resin beads. Two anion exchangers are <br /> required because a majority of the wood treating chemicals are anionic. <br /> Main Process Flow <br /> A process schematic for the water treatment plant is presented in <br /> Figure 5. The flow of water and the removal of contaminants from the water <br /> is briefly described below. <br /> The three waters to be treated, storm water runoff, pond water, and <br /> groundwater, will be collected and pumped to the Flow Equalization Basin. <br /> Passing all three water sources through this basin will allow for the <br /> treated flow rate to remain constant at approximately 250 gallons per <br /> minute or 360,000 gallons per day. Float controls in the basin will prevent <br /> overfilling and will allow for preferential treatment of storm cater in <br /> favor of groundwater. This preferential treatment will minimize the time <br /> that storm water remains on the plant site. <br /> S6 3 <br /> HII <br />