MONITOREO DEL DESEMPEÑO Y ESTUDIO BATIMÉTRICO DE LA PLANTA DE TRATAMIENTO DE AGUAS RESIDUALES DE NEVES PAULISTA (SÃO PAULO, BRASIL) (PERFORMANCE MONITORING AND BATIMETRIC SURVEY OF THE NEVES PAULISTA (SÃO PAULO, BRASIL) SEWAGE TREATMENT PLANT)
MONITOREO DEL DESEMPEÑO Y ESTUDIO BATIMÉTRICO DE LA PLANTA DE TRATAMIENTO DE AGUAS RESIDUALES DE NEVES PAULISTA (SÃO PAULO, BRASIL) (PERFORMANCE MONITORING AND BATIMETRIC SURVEY OF THE NEVES PAULISTA (SÃO PAULO, BRASIL) SEWAGE TREATMENT PLANT)
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El presente trabajo tuvo como objetivos evaluar el desempeño de la planta de tratamiento de aguas residuales de Neves Paulista en las diferentes temporadas climáticas anuales y diagnosticar la acumulación de lodos de sus lagunas de estabilización anaerobia y facultativa. Se midieron diversos parámetros de la calidad del agua afluente y efluente a la planta en 3 etapas de colecta, cada una con una duración de 3 meses, se realizó un estudio batimétrico de las lagunas para cuantificar la acumulación de lodos y se aforó el afluente durante 24 horas consecutivas. La remoción media de demanda bioquímica de oxígeno fue del 73,9 % y la de coliformes fecales fue menor a 2 unidades logarítmicas. Los lodos acumulados representaron cerca del 25 % del volumen efectivo de las lagunas reduciendo así sus tiempos de retención hidráulica. La planta requiere la inclusión de un sistema de pretratamiento, la remoción controlada de lodos acumulados en las zonas más críticas e implementar un sistema de postratamiento que garantice remoción adicional de materia orgánica y coliformes para ajustarse a las regulaciones ambientales brasileras.
Abstract: The main objectives of this work were to evaluate the performance of the sewage treatment plant of Neves Paulista during the different yearly climatic seasons and to diagnose the sludge accumulation in its anaerobic and facultative waste stabilization ponds. Different water quality parameters on the plant influent and effluent, in 3 stages of collection of 3-month long each were measured, bathymetric survey of the lagoons for estimate the sludge accumulation volumes and a 24 consecutive hours affluent flow monitoring were conducted. The average BOD removal efficiency was 73.9% and the faecal coliforms removal was less than 2 logarithmic units. The accumulated sludge represented almost 25% of the lagoons effective volume reducing their hydraulic detention times. The plant requires the set up of a pre-treatment system, the controlled sludge accumulated removal of the most critical zones and the implementation of a post treatment system to guarantee additional organic matter removal and fecal coliforms in order to met the Brazilian environmental regulations.
Sumário: Este trabalho tem como objetivo avaliar o desempenho da instalação de tratamento de águas residuais de Neves Paulistas nas diferentes temporadas climáticas anuais e de diagnosticar a acumulação de lodo das suas lagunas de estabilização anaeróbia e facultativa. Mediram-se diversos parâmetros da qualidade da água afluente e efluente à instalação em 3 etapas de coleta, cada etapa com uma duração de 3 meses, realizou-se um estudo batimétrico das lagunas para quantificar a acumulação de lodo e aforou-se o afluente durante 24 horas consecutivas. A retirada meia de demanda bioquímica de oxigênio foi de 73,9% e la de coliformes fecais foi menor a 2 unidades logarítmicas. Os lodos acumulados representaram cerca do 25% do volume efetivo das lagunas reduzindo assim seus tempos de retenida hidráulica. A instalação requer a inclusão dum sistema de pre-tratamento, a retenida controlada de lodo acumulado nas zonas mais críticas e implementar um sistema de pos-tratamento que garantisse retenida adicional de matéria orgânica e coliformes para ajustar-se às regulações ambiental brasileiras.
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