AERATION
consumption. Control tools should not only be seen as a good means for optimizing the operation of WwTPs but should rather be considered as early as the design phase of new plants in order to display their full potential. ■■■
Figure 3. Evolution of the ratio kWh/kg COD removed depending on the quantity of removed COD when the WwTP is designed for one single set point (vertical line in figure a) and an extended working zone (hatched zone in figure b ). The Z zone can not be reached because of the equipment constraints. Besides the on- going attempts to reduce the energy consumption (dotted line in figure a) the introduction of flexible equipments and advanced control strategies could allow for optimised energy performances on a large working zone.
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32 Water & Wastewater Treatment September 2010 Registered charity numbers 288701 (England and Wales) and SC039479 (Scotland)
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