Laserfiche WebLink
GVAVEIONICS_ <br />PROPRIETARY & CONFIDENTIAL <br />is Mine Water Treatment — Peabody Energy Page 20 of 48 <br />6. Mine. Treatment:DesclIption <br />6.1 Mine Water Treatment System <br />The objective of this multi -stage process water treatment system is to provide a <br />design that can accommodate different applications and varying water <br />characteristics all while meeting the defined process water discharge limits. Prior to <br />discharge, the effluent will be analyzed for pH and turbidity and will only discharge <br />as user - defined control points are met. The system to be designed and constructed <br />will incorporate the following treatment applications within a single system. <br />6.1.1 Pre - Treatment System <br />Initial pretreatment water treatment will be performed by WavelonicsTM <br />whose core application is based on the electrical process referred to as <br />Electrocoagulation (EC). In combination with these principles and other <br />proprietary technology, WavelonicsTM has the capacity to de- emulsify <br />emulsified oils, precipitate contaminants, oxidize metals and coagulate <br />suspended fine particles. When contaminated and /or turbid water passes <br />through the WavelonicsTM unit cells, the primarily negatively charged <br />particles combine with a positive charge, thus initiating the coagulation of <br />colloidal particles. The charged particles agglomerate into larger particles <br />and are then passed through sand and /or cartridge filters to capture these <br />larger particles. The result an effluent with low turbidity and contaminate <br />• levels that meets or exceeds predetermined water quality standards that <br />may be discharged to surface waters. All water prior to discharge will be <br />analyzed as it passes through a Managed Water Quality Valve that will <br />only allow water in a specified parameter range of nephelolometric turbidity <br />units (NTU) and pH to be passed through, otherwise the water is sent back <br />to the source. <br />6.1.2 Solids Separation Treatment System <br />The Solids Separation Treatment system provides the reaction and settling <br />time required for this application. The size and configuration of the Settling <br />Storage tanks are defined in the design. After the water has been treated <br />by Wavelonics (EC), the water passes from tank to tank, solids separation <br />occurs as part of the physiochemical treatment and mechanical design of <br />the system. In the final stage, tank water is pulled through a deep -bed, <br />multi -media filter for final solids removal /polishing. <br />Once the water has passed through the multi -media filter, it will return to <br />the Wavelonics system for water quality verification. The verification <br />process will be based on turbidity of less than 10 NTU's and a pH set at an <br />optimum point to the receiving waters. Any water that does not meet the <br />pretreatment water quality criteria is returned to the influent source for re- <br />processing. Qualifying water is then sent to the final treatment stage; a <br />double stage reverse osmosis system. <br />• A Solids Transfer System pulls collected solids from each settling tank by <br />solids pumps to a Solids Management System. All backwash water from <br />the multi -media filter will also be sent to the Solids Management System. <br />Document Version: 4.0 © Water Tectonics, Inc. 2008. All rights reserved. /r1s <br />W WATERTECTONICS <br />