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Air Supply for Discharge Piping <br /> Skimmer Pump <br /> ,,. . <br /> .',AAir Supply for <br /> 1 ,fir RAS Pump <br /> South <br /> Skimmer <br /> 1 <br /> Weir Baffle <br /> 918 Weir <br /> South Hopper of the Clarifier <br /> Solids Passing <br /> Over Weir 1 <br /> { <br /> I <br /> Weir Baffle <br /> I <br /> i <br /> i <br /> Clarifier Weir with Solids Going Over the Weir <br /> Denitrification <br /> Denitrified sludge occurs when the bacteria that have settled in the clarifier remain too long and <br /> are not returned to the aeration tank or wasted to the sludge tank. <br /> When sufficient nitrogen gas bubbles are generated in the settled bacteria, the settled sludge <br /> becomes buoyant and is lifted to the clarifier surface.This is termed denitrification. To confirm if <br /> floating sludge on the surface of the clarifier is due to denitrification, a gentle agitation of the <br /> floating sludge will typically detach the nitrogen gas bubbles and floating solids will immediately <br /> settle out, <br />