Influência do meio suporte na eficiência de remoção em wetlands tratando esgoto sanitário

Abstract

In Brazil, the sanitation conditions are still far from ideal, especially in relation to the collection and treatment of sanitary sewage, mainly in small communities which do not have sewage networks. These communities usually use the septic tank system for treating sanitary sewage from their houses, but sometimes it is dumped directly in the streams. One of the possible processes of wastewater treatment that can be used in small communities is the treatment in constructed wetlands systems. The use of constructed wetlands in the treatment of domestic sanitary sewage is still very limited in Brazil. The aim of this work was to compare the efficiency of three constructed wetlands, each one using a different filling material. It was observed the use of expanded clay pellets, which have a high cost, the use of ceramic and concrete materials from construction waste, which are low cost materials, that even might be found for free. It was statistically analyzed the removal power in each constructed wetland for the following parameters: COD, BOD and ammoniacal nitrogen. The analyzes demonstrated better results for using ceramic materials from construction waste as a filler, while the performance of the expanded clay pellets and concrete material from construction waste were very similar.