Considerando a evapotranspiração no cálculo de eficiência de estações de tratamento de esgoto com planta
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Data
2011-12
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Emerging as an alternative to currently known conventional sewage treatment systems, the use of systems that imitate natural processes becomes the target of new researches every day. Proved by several researchers, the sewage treatment systems with plants have been shown effective, especially on organic matter and nutrients removal. However, for its efficiency calculation has been used the same formulas adopted in other systems, which leads to an underestimation in the efficiency values, since the plants significantly reduce the effluent volume. So, this study proposed to calculate the efficiency of sewage treatment systems that use plants, considering the removal of the pollutant load (concentration multiplied by volume), and not only the concentration of the pollutant. Research findings in the area were used on efficiencies simulating with evapotranspiration rates of 20%, 40% and 60% of sewage volume. The simulations demonstrated the requirement to consider the evapotranspiration water loss when calculating the efficiency of sewage treatment systems with plants, since there was an increase upper than 30 percentage points in their values, as in the case of total phosphorus removal, whose efficiency value increased from 48% to 79.2%.
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Constructed wetlands, Alagados construídos, Rootzone system, Pollutant load, Zona de raízes, Carga poluidora
Citação
ALMEIDA, Rogerio de Araújo; UCKER, Fernando Ernesto. Considerando a evapotranspiração no cálculo de eficiência de estações de tratamento de esgoto com planta. Engenharia Ambiental, Espírito Santo do Pinhal, v. 8, n. 4, p. 39-45, out./dez. 2011.