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further. It is critical that this valve be opened after wasting sludge. If the valve is <br /> not opened, the sludge holding tank will become septic and produce a foul odor. <br /> 7. Allow the wastewater treatment plant to operate approximately one hour before <br /> conducting a mixed liquor settleable solids test in the aeration chamber. No <br /> more than 10% of the solids in the aeration chamber should be wasted at a time. <br /> Sludge should not be wasted twice in one day. <br /> 8, Be aware that sludge will eventually become so concentrated in the sludge <br /> holding tank that when the diffusers are turned off, very little clear liquid will <br /> appear over the sludge. When this occurs, the sludge holding tank should be <br /> pumped by a septic tank pumping truck for proper disposal, or the sludge should <br /> be pumped to drying beds or other sludge drying and handling facilities which <br /> may be available. Only during extended periods, when the wastewater treatment <br /> plant is lightly loaded, can the sludge be returned to the aeration chamber (for <br /> example, at the end of the school year or at the end of camping season), <br /> providing complete oxidation of all organic material. After the sludge has been <br /> totally oxidized, the plant is then turned off until the next operation season. If for <br /> any reason the sludge holding tank is pumped, it should be immediately refilled <br /> with water to minimize any uplift pressures from groundwater in the surrounding <br /> soil. <br /> res:,K.ai-nre�ei-;rncesscantroir•-�:q-1-� <br />