Seeking advice on the calculation of sludge age!
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Effective volume of the aeration tank * Sludge concentration / 24 * Sludge removal rate per hour * Concentration of returned sludge. I used this formula for calculations. In the Carrousel process, the effective volume of the aeration tank is 12,530 ML, the MLSS level is 4,000, the sludge removal rate is around 10 tons per day, and the concentration of returned sludge is 7,000. How can it be that the sludge age is so high?
The sludge discharge volume is 10 tons per day; multiplying this by the concentration of returned sludge, which is 7000, gives the total sludge discharge volume； The effective volume of the aeration tank is 12,530 multiplied by MLSS; 4,000 represents the total amount of sludge ； Total sludge volume/Sludge discharge volume = Sludge age, that is, 12530*4000/(10*7000) = 716 days. An excessively low sludge discharge rate or too high MLSS are the reasons for an overly long sludge age. If there are no issues with operation, it isn’t necessary to deliberately reduce the sludge age; however, from the perspective of proper control of F/M, it is still beneficial to lower the sludge age to some extent.