ABSTRACTe aim of this study was to evaluate the Eichhornia crassipes and Salvinia auriculata e ciency as bioremediation alternatives for wastewater from a dairy company in Toledo, Paraná. e experiment was performed between June and August of 2014, for 36 days in the greenhouse at PUCPR campus Toledo. It was used 750 liters of e uent from a dairy plant in Toledo-PR, arranged in three polyethylene reactors, operating intermittently (batch). e repetitions were performed according to the hydraulic retention time (HRT), every 4 days. It was evaluated 7 physicochemical parameters of the e uent (temperature, pH, turbidity, total solids, COD, total nitrogen and total phosphorus). e results obtained during the experiment were satisfactory, it was observed the maximum e ciency of turbidity, total nitrogen, and COD of 94.4%, 90.26% and 82%, respectively, with E. crassipes and 91.7%, 75.65% and 82% respectively for S. auriculata. However, from the period between the day 16 and the day 20 of the experiment, it was observed increases in the level of the parameters because some plants got into the senescent process, returning to the environment half of all that were absorbed. is result suggests the necessity of removal plants in senescence, so the system can work properly. e aquatic macrophyte E. crassipes was better biorremediator for dairy e uents than S. auriculata, however, both of them can be widely used in the treatment of wastewater with high levels of organic matter and nutrients. Keywords: W ater Hyacinth; Salvinia; Phytoremediation; Dairy E uents.
RESUMOTratamento de efl uentes de laticínio em sistemas de zonas úmidas com macrófi tas aquáticas fl utuantes. O objetivo deste trabalho foi avaliar a efi ciência de Eichhornia crassipes e Salvinia auriculata como alternativas de biorremediação para águas residuárias provenientes de uma indústria de laticínios em Toledo, Paraná. O experimento foi realizado entre os meses de junho e agosto de 2014, durante 36 dias, na casa de vegetação da PUCPR campus Toledo. Foram utilizados 750 litros de efl uente de um laticínio em Toledo-PR, disposto em três reatores de polietileno, operando de forma intermitente (batelada). As repetições foram realizadas em função do tempo de detenção hidráulica (TDH), a cada 4 dias, foram avaliados
