The sludge age follows from: KS + S

(2) The reactor volume V follows from the substrate balance:

Pmax S

Pmax SX

(3) Comparison with the results from Problem 6.1:

Problem 6.1: tRX — 0.833 d, S — 25 mg L-1 COD and V — 709 m3 excess sludge: 1702 kg d-1 MLSS

Problem 6.2: tRX — 4.217 d, S — 7.14 mg L-1 COD and V — 2208 m3 excess sludge: 1065 kg d-1 MLSS


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