Tratamento de resíduos sépticos em wetlands construídos de fluxo vertical


The use of constructed wetlands (CW) in the treatment of septic waste (SW) is still very limited in Brazil, mainly due to limited research on the topic. The objective of this study was to evaluate the use of a vertical downward flow toilets in the treatment of SW, emphasizing specifically on the treatment efficiency of the percolated liquid and sludge accumulated in the cells of treatments for compliance with Brazilian environmental legislation. Two cells were built (one vegetated with vetiver grass and other vegetation without) experimental for reception and treatment of SW. Any gross SW as the liquid fraction leachate treated, besides the accumulated sludge in beds were evaluated by physical-chemical and microbiological parameters over time. It was observed that the toilet was more efficient and adequate compliance with environmental legislation in the control tank, with the exception of ammonia nitrogen content in the treated leachate. The system without plants always showed high variation of efficiency and little compliance with legislation. Regarding the accumulated sludge, both treatment beds had treatment efficiency for future agricultural use, but for that there was a need for at least one month as a period of "rest" without applications.



Lodo séptico, Legislação ambiental, Alagados construídos, Septic sludge, Wetlands constructed, Environmental legislation


SILVA JÚNIOR, Édio Damásio da; ALMEIDA, R. A.; SIQUEIRA, E. R.; SILVA, A. R.; RODRIGUES, A. M. Tratamento de resíduos sépticos em wetlands construídos de fluxo vertical. Revista Engenharia e Construção Civil, Curitiba, v. 2, n. 2, p. 11-22, jul./dez. 2015.