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.
Automatic adjustment of cycle length and aeration time for improved nitrogen removal in an alternating activated sludge process
S. Isaacs; Automatic adjustment of cycle length and aeration time for improved nitrogen removal in an alternating activated sludge process. Water Sci Technol 1 January 1997; 35 (1): 225–232. doi: https://doi.org/10.2166/wst.1997.0053
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