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<br />Water Treatment Plant <br />• A plan view of the water treatment plant equipment is depicted <br />in Figure D-5. A brief description of each major piece of equipment <br />is given below along with its use and method of operation. l~he re- <br />tention time in each tank was calculated using maximum water flow of <br />620 gallons per minute( gpn~). Most of the time, however, they flow <br />averages 550 gpm. <br />*Reaction Vessel <br />The mine water and recycled sorting plant water is fed to a <br />9 ft. diam x 7 ft. high steel tank with an agitator. All reagents, with <br />the exception of Separan, are added to this tank. The volume of the <br />tank is 3250 gallons, yielding a retention time of 5.2 minutes; the <br />tank outlet is baffled. There is sufficient time available to permit <br />thorough mixing of the incoming solutions and reagents. The pond <br />• system provides sufficient retention time for maximum precipitation of <br />radium and settling out of suspended solids. <br />*Separan Mixing Tank <br />This is a 3 ft. diam x 4 ft. high, 200-gallon, FRP tank with a mixer <br />for mixing up a 0.01-0.05% Separan ~JP-30 solution. Separan h~P-30 is a <br />flocculant and is fed over a 2h-hour period to the discharge of the re- <br />action vessel to enhance flocculation and settling of suspended solids. <br />*Ferric Sulfate Mixing Tank <br />This is an u ft. diam x 4 ft. high, 1500-gallon, FRP tank with a <br />mixer for mixing ferric sulfate and water to yield a 10% Fe2(S04)3 solution. <br />This reagent is only required when the precipitation of radium is too <br />slow. Analysis of overflows from the various ponds indicate when a <br />slowdown in precipitation is occurring. <br />• <br />D-3 <br />