Sludge Decanting (Tnk-901) - ProMinent DULCOMETER PH-501 Assembly And Operating Instructions Manual

7.4 Sludge Decanting (TNK-901)

In order to maintain an optimal concentration of mixed liquor suspended solids (MLSS) (typically
10 g/L), a portion of the mixed liquor is periodically wasted by pumping from the Aeration Tank
(TNK-501) to the sludge holding tank (TNK-901). Wasted sludge in the sludge holding tank is
thickened by decanting supernatant back to the screen tank. Thickened sludge accumulates in
the sludge holding tanks until it is eventually pumped out for disposal.
Excess sludge will be wasted by P-503 from the Aeration Tank (TNK-501) every 10 mins at
noon. See below.
Tag Description
P503 WASTE
When P-503 will waste
HOUR
P503 WASTE
Time that P-503 wastes for
SP
In order to decant the water from the sludge, the air to TNK-901 diffuser must be turned off.
See valve location below.
After the sludge has settled, that the operator would open the appropriate valve on TNK-901 to
decent off the water.
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Diffuser Air Valve
Decanting Valve
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