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4.4.1 Effectiveness <br />Effectiveness for the treatment options evaluation was defined as a water treatment system that <br />would be capable of treating flows from 100 to 200 gallons per minute (gpm) while achieving the <br />water quality objectives for TDS, sulfate, and manganese. <br />Also included in the effectiveness evaluation was a consideration of the nature end quantity of <br />by-products and their management. A treatment system was considered ineffective if, in treating <br />the primary flow, large volumes of secondary flows would also require treatment. <br />4.4.2 Operability <br />Operability is a performance criterion that relates to the ability to physically install and <br />continuously operate a given water treatment system. Issues relating to the physical system for <br />this project included: (1) treated water infiltration or surface dischazge, (2) shury or sludge <br />management, (3) site environmental constraints (e.g., winter temperature), and (4) the level of <br />operator labor required. Some of the issues relating to operation pertain to meeting and <br />maintaining the required operating pressures, temperatures, flow on a continuous basis, and <br />effluent water quality. <br />4.4.3 Bench-scale and Pilot Testing <br />Bench-scale and pilot-scale tests have been performed to provide data to provide the data <br />necessary to evaluate the treatment alternatives. <br />4.4.3.1 Microfiltration Bench-Scale and Pilot Testing <br />Initial bench-scale studies for microfiltration were completed and a preliminary pilot test was <br />performed in December 1998. The pilot test entailed operation of the microfiltration unit for <br />approximately 48 hours. Water from BF-2 was pumped at a rate of approximately I gpm into a <br />precipitation tank where [he groundwater was pretreated to form suspended particles. Water <br />from the precipitation tank was then introduced to the microfiltration unit under pressure, and the <br />concentrate and treated water streams collected. Ceramic filters with varying pore sizes were <br />Bnttle Mountain Resources. /nc. <br />p:VOOZ674repottsVmnrchrptlvl(i»prmngimarch.doc 48 March 2Z, 1999 <br />