In this paper, it was evaluated the efficiency of four constructed wetlands (CWs) in the treatment of sewage after being subjected to preliminary treatment, and for some SACs, primary treatment (septic tank). In CWs planted with yellow lily (Hemerocallis flava), since the gravel #0 as the support medium, and submitted to organic loading rates (OLR) of sewage, in terms of BOD (kg ha-1 d-1): 44, 98, 230 and 395 kg ha-1 d-1 and hydraulic detention times (HDT) of 3.9, 2.0, 1.0 and 0.75 days, respectively. To evaluate the efficiency of systems, analysis of BOD, COD, TSS, total-N, total-P, K and Na were performed in the influent and effluent to the SACs for 6 months of operation of the system. In all the CWs there was predominance of the anoxic/aerobic environment, and high efficiencies in the removal of TSS, BOD and COD were obtained, meeting the effluent discharge standards set by the environmental legislation of the Minas Gerais State.
wetlands systems; ornamental plants; removal of pollutants; wastewater
