Storm tanks, or equalization basins, have been used for many years in sewer or wastewater treatment systems to reduce the amount of combined sewer overflows. In this paper, a systematic control of an equalization basin is used not only to dampen or reduce the hydraulic load, but also to systematically improve the effluent quality in a nitrogen removal plant. It is demonstrated that the effluent ammonia concentration is the key component. The Benchmark Simulation Model 1, implemented in MATLAB/Simulink, has been used to perform the evaluations. It has been extended with systematic rainfall generations. Intuitively, it is apparent that the equalization basin should be emptied before a rainfall. This requires a prediction capacity. It is shown that the choice of prediction time is by no means trivial and it is not true that a long prediction horizon is always advantageous.
A benchmark study of controlled emptying of equalization basins
J. Bolmstedt, G. Olsson; A benchmark study of controlled emptying of equalization basins. Water Sci Technol 1 December 2005; 52 (12): 113–121. doi: https://doi.org/10.2166/wst.2005.0442
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