Lagoon disposal of alum sludge is being considered for a water treatment plant processing mVd. The proposed site, can accommodate four lagoon cells, each with a surface area of 800 m2 and depth of 3.0 m. Sludge from the sedimentation basins averages 15 nr3/d and contains 1.4% solids; the quantity of filter wash water is 400 m3/d and contains 160 mg/l of suspended solids. The wash water is to be gravity thickened to greater than 1% with polymer addition before discharging to the lagoons. The plan of operation is to discharge from the sedimentation basins and thickeners to fill 6he cell at a time, withdrawing supernatant and allowing consolidation and air drying for at least one year after filling before cleaning. This aging period is expected to enhance dewatering by subjecting the sludge to freeze-thaw cycles during the winter months. Based on field studies, this procedure will shrink the sludge layer to a depth of less than one meter with an average solids content of 10%. Is this proposed plan likely to be successful?
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