Selection of Sewage Treatments in the Scope of Hydrographic Basins from Different Methodological Approaches.

Name: Luiza Mayer Bringer Corteletti
Type: MSc dissertation
Publication date: 14/06/2017

Namesort descending Role
José Antônio Tosta dos Reis Advisor *

Examining board:

Namesort descending Role
Antonio Carlos Zuffo External Examiner *
Antonio Sérgio Ferreira Mendonça Internal Examiner *
José Antônio Tosta dos Reis Advisor *

Summary: In Brazil, the disposal of raw industrial and domestic effluents is one of the main factors responsible for the severe impairment of the quality of the water courses. On the other hand, individual or collective treatment of sewage prior to launching is the main pollution control strategy. However, the level of treatment required depends on the recipient's ability to self-purify, on the characteristics of the use of the water downstream of the point of launch, and on the characteristics and conditions of the evictions. In order to determine the required level of removal to a sewage treatment plant, water quality mathematical models in conjunction with optimization techniques have been used in the process of selecting treatment systems, usually aiming to achieve economic objectives . However, in water resource systems, the search for problem solving involves multiple and conflicting objectives. The present work employed a water quality simulation model, optimization technique and multiobjective analysis to select sewage treatment systems for the Pardo river basin. By reproducing the mathematical formulations and conceptual and computational structures of the QUAL-UFMG model, the computational program developed in the MATLAB software environment, together with the Genetic Algorithm, allowed the appropriation of minimum removal efficiencies of organic matter for the different effluent disposal points of the Pardo river basin, considering different scenarios for disposal of treated effluents. After a technical pre-selection stage, which considered three different possible sewage treatment scenarios, a multiobjective analysis was applied using the Electre III method, which indicated sewage treatment systems for Ibatiba, Irupi, Iúna, Holy Trinity and Our Lady of Grace, currently responsible for the disposal of raw sewage in the Pardo river basin. Systems such as Rapid Infiltration, Submerged Aerated Biofilter (with Nitrification), Wetland, Facultative Ponds and UASB reactors (followed or not after treatment) were the most indicated for the sewage treatment scenarios considered

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