The paper examines the nitrogen dynamics in the alternating BIODENITRO and BIODENIPHO processes with a focus on two control handles influencing flow scheduling and aeration: the cycle length and the ammonia concentration at which a nitrifying period is terminated. A steady state analysis examining the combined effect of both control handles reveals three conditions which characterize when nitrogen removal is maximized. A dynamic analysis shows that these conditions also apply for a changing ammonia load. This then allows an automatic control strategy for maximizing nitrogen removal to be based on a cycle by cycle single variable optimization rather than a more difficult multivariable optimization over a longer time horizon.

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