Abstract
ABSTRACT In order to determine required wastewater treatment plants (WWTP’s) efficiencies, several methodologies have been proposed to assist the sewage treatment systems process selection, usually aiming to achieve economic objectives. However, in water resources problems solving, search involves multiple and conflicting objectives. This work used, for Pardo’s river basin (Espírito Santo State, Brazil), water quality simulation model, optimization technique and multiobjective analysis for selecting sewage treatment systems, taking into account Brazilian environmental effluents Biochemical Oxygen Demand standards, imposed by CONAMA Resolution 430/2011. After proposing an optimization model that allowed the estimation of minimum organic matter removal efficiencies, a multiobjective analysis was applied by using the ELECTRE III method, which selected sewage treatment systems for localities responsible for domestic wastewater disposal in Pardo’s river basin. The results indicated that keeping the effluents standards can produce treatment plants overestimation and inadequate allocated financial resources distribution for sewage treatment plants implementation. Treatment systems such as Submerged Aerated Biofilters (with Nitrification), Wetlands and Facultative Ponds were the most selected, considering different contexts appreciated in this work.
Highlights
In the accelerated urban development context in various parts of the world, wastewater treatment plants (WWTP) are key technologies for meeting restrictive environmental and public health standards
It should be noted that, among the methodologies that have been developed to assist the decision-making process regarding wastewater planning and management it is not observed the use of water quality modeling and optimization techniques together with the multiobjective analysis methods, given that, while the former two are usually associated with the technical and economic approach, the latter is related to the appropriate technology analysis approach
The sewage treatment efficiencies obtained through combined use of the water quality model with the optimization technique estimated for each locality will be presented
Summary
In the accelerated urban development context in various parts of the world, wastewater treatment plants (WWTP) are key technologies for meeting restrictive environmental and public health standards. Since downstream watercourse quality is affected by upstream conditions, wastewater treatment facilities cannot be considered isolated from each other (RAHM et al, 2013) In this perspective, the present work has studied water quality simulation model, optimization technique and multiobjective analysis use to conform sewage treatment systems selection process, within watersheds. It should be noted that, among the methodologies that have been developed to assist the decision-making process regarding wastewater planning and management it is not observed the use of water quality modeling and optimization techniques together with the multiobjective analysis methods, given that, while the former two are usually associated with the technical and economic approach, the latter is related to the appropriate technology analysis approach. In none of the effluent disposal points there exists Sewage Treatment Plants (SWT)
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