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This paper discusses the joint application of optimization and water quality modeling techniques to support the selection of wastewater treatment plants (WWTPs). In this sense, a theoretical demonstration of the methodology is presented. To make the case study more realistic, data from the upper reaches of the Rio Santa Maria da Vitória, Espírito Santo state, Brazil, were used. The results indicate that the methodology can technically support decision making regarding the selection of WWTPs in a river basin. They also demonstrate that when the adoption of minimum levels of BOD removal, set by CONAMA Resolution n 430/2011, does not take into account the dilution and self-depuration capacity in the receiving water bodies, it can increase costs of WWTPs, without gains related to maintenance of DO and BOD parameters within the limits established by CONAMA Resolution n 357/2005. Key-words: Nonlinear Programming, water quality modeling, wastewater treatment systems planning.

rbrh

Uso de Otimização e Modelagem de Qualidade de Água no Planejamento de Implantação de Sistemas de Tratamento de Esgotos Sanitários em Bacias Hidrográficas