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The thickener has sufficient capacity to allow <br /> for storage of solids during idle periods, such <br /> as weekends. <br /> Inclined Plate Clarifier <br /> The inclined plate clarifier uses flocculation <br /> and mechanical means to remove further solids. <br /> The flow of water is flocculated and passed <br /> over inclined plates, which separate the <br /> particles from the water. The clarifier has <br /> been sized to treat sediment loads ranging from <br /> 0 to 1, 200 ppm. <br /> Design parameters are as follows: <br /> Design mWimm <br /> Influent flow rate, gpm 600 1,000 <br /> Clarifier overflow rate, gpm/ft2 0.125 0.21 <br /> Flocculator detention time, min. 8.5 5.1 <br /> Effective surface area, ft2 4200 4800 <br /> Weir overflow rate, gpm/ft 16 25.6 <br /> Flocculant dosage, ppm 2-4 2-4 <br /> At a flow of 600 gpm, engineering design is for <br /> water clarity of 35 ppm. on leaving the <br /> clarifier. <br /> Surge Tank & Pumper <br /> Clarifier overflow reports to a surge tank, <br /> from which it is pumped to mixed media filters. <br /> Until this point, the system relies entirely <br /> on gravity flow. The mine water flows by <br /> gravity to the plant and advances in the <br /> overflow from the coarse classifier to the <br /> thickener and/or the clarifier, overflows the <br /> clarifier to the surge tank. <br /> The water is pumped from the surge tank into <br /> the mixed media filters as a means to create <br /> pressure, forcing the water flow through the <br /> filters, then out to the pipe leading to <br /> outfall 028. <br /> The surge tank is equipped with an overflow <br /> line. In the event of a power failure, during <br /> which the pumps would not operate, water from <br /> the surge tank would overflow to the line, <br /> which in turn leads to the collector ditch <br /> 3 <br />