The standards for discharge of sewage of a waste water treatment plant with an organic load of 110,000 FE require an ammonia nitrogen value of max. 5 mg/l. Since the design capacity of the plant is subject to important load variations, a process configuration guaranteeing full nitrification efficiency at each load is required. The described treatment system is equipped with an aeration control regulating the ammonia concentration in the effluent. The reactor configuration combined with the controlling equipment allows to fully utilize the simultaneous nitrification/denitrification capabilities of this plant. Finally the operation experiences and results obtained with this treatment process will be reported.

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