Análise Comparativa de Parâmetros Hidráulicos para Dimensionamento de Tecnologias em Estações de Tratamento de Esgoto.

The combination of wastewater treatment process should provide the best performance of a Waste Water Treatment Plant (WWTP) within its operational conditions. For the hydraulic and sanitary design of each technology, different parameters are often used and a deeper understanding of these contributes to the implementation of more efficient STPs. Hence, the present work performed a comparative analysis between the sanitary hydraulic parameters by rearranging the design equations for: primary sedimentation tank, secondary clarifier, UASB reactor and its decantation compartment, besides the anaerobic, optional and polishing lagoons. The following parameters were addressed: Hydraulic Load (HL), Hydraulic Retention Time (HRT), Specific Surface Area (SSA), Applied BOD Flux (ABF) and Depth (D). Subsequently, several experimental conditions were simulated by varying the limit values proposed in the various adopted bibliographies. The study results revealed that some conditions established from recommended values are neither applicable nor feasible to be implemented. In terms of anaerobic treatment, the UASB reactor proved the most efficient as predicted. Furthermore, the results found for facultative and polishing lagoons confirmed the treatment principle adopted in each unit. Regarding the results found related to primary sedimentation tanks and UASB reactors, through the theoretical calculations, it was possible to observe that there are conditions allowing the adoption of smaller areas, when the depths are higher, maintaining the efficiency of the treatment system. [ABSTRACT FROM AUTHOR]