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izll �WAVEI NICE PROPRIETARY & CONFIDENTIAL <br />• Mine Water Treatment — Peabody Energy Page 21 of 48 <br />6.1.3 Water Treatment System <br />This final stage is designed with a two -step Reverse Osmosis (RO) <br />process. In the first step, the PR0450 RO's primary objective is to <br />reducing the TDS within the water. The second step takes the <br />reject/condensate stream from the PR0450 and sends it to the PR0200 <br />RO with primary goal of minimizing the overall waste stream in the <br />treatment process. The reject/condensate from the PR0200 is then <br />returned back to the influent source. <br />6.1.4 Solids Management System <br />The Solids Recovery System sizing is a function of the quantity of process <br />water treated. If the initial system can treat less water but reach a higher <br />degree of purity, then there will be less sludge to process. <br />The key components that are part of the Solids Management System are — <br />• Backwash Media Tank <br />• Sludge Tank (Receiving) <br />• Sludge Pumps <br />• Dewatering System (Containment pad and dewatering bags) <br />A brief operational narrative of how the Solids Management System works <br />is outlined below - <br />• • Sludge pumps from the settling tanks to the primary sludge tank <br />• Backwash water from the Media Filter will go into a separate tank. <br />Water will decant from the top back to the source or pre- treatment <br />tank. Sludge in this tank will be pumped to the sludge collection <br />tank. <br />• A sludge pump from the sludge collection tank will push solids into <br />the dewatering bags. The expressed water will be returned back to <br />the source. <br />Document Version: 4.0 © Water Tectonics, Inc. 2008. All rights reserved. <br />W WATERTECTONICS <br />