In nitrifying activated sludge systems several practical advantages accrue from inclusion of unaerated (anoxlc) zones. Accepting the general activated sludge model proposed by the IAWPRC Task Group, as modified by Dold and Marals (1985), simulation studies on nitrifying and nltrlfylng-denltrlfylng systems demonstrate the advantages of the latter with respect to (1) reduction in dally oxygen requirements, (2) reduction in effluent nitrate load, (3) elimination of pH control, (4) alleviation of the stringency in D.O. control, and (5) reduction in the required peak aeration capacity.

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