Wastewater treatment plants are widely used to decrease harmful discharges to receiving water bodies. These plants are regarded as the top energy consumers by municipalities. Energy demand of a plant depends on the volume of wastewater treated, organic load and effluent quality requirement etc. In order to ensure energy efficiency in these plants, it should be focused on these parameters. In this study, the impacts of design parameters on energy cost for a dairy wastewater treatment plant were

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... nvestigated. This paper aims to reveal the role of design flow on energy efficiency. An indicator parameter that is energy cost indicator has been used. This indicator was calculated for both design wastewater flow and operational wastewater flow. The results show that energy cost indicator of operational flow was higher than design flow that were 2.1x10 -8 and 2.36x10 -27 , respectively. If plants are operated in design flows, energy cost can be decreased.