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-This article describes bench scale sequential, biological and coagulation-flocculation treatment of mature leachate for the removal of nitrogen and biodegradable and recalcitrant carbonaceous material. The biological stage was conducted on two SBRs, one of which inoculated with nitrifying sludge, another without an inoculum, for 152 and 133 days, respectively. The coagulation-flocculation stage used four coagulants at different doses and pH adjustments. The treatment conducted on the inoculated SBR when a pH control was used produced mean removals of BOD 5 , COD and TKN of 69.6%, 38.5% and 51.6%, respectively, and practically complete denitrification. Coagulation-flocculation applied to the effluent of the inoculated biological reactor showed a superior effectiveness of the ferric coagulants, when the pH was adjusted to close to 6.0, producing removals of turbidity, COD and true color close to 95%, 78% and 92%, respectively.

RESUMO O trabalho objetivou o estudo taxonômico de microalgas do gêneroTrachelomonas (Euglenophyceae) na Área de Proteção Ambiental (APA) do rio Ibirapuitã, localizada na fronteira sudoeste do Estado do Rio Grande do Sul. Foram amostradas 10 estações de coleta em ambientes lóticos e lênticos, no período de 2011 a 2013. As 34 amostras resultantes de quatro coletas foram obtidas com rede de plâncton com abertura de malha de 30 µm, e conservadas com formol a 4%. São apresentados os nove táxons que são novos registros para o Estado do Rio Grande do Sul, encontrados em somente três estações de coleta das 10 amostradas. Dentre esses, distinguem-se ainda por serem citados pela primeira vez para o Brasil: Trachelomonas bernardii Wolosz. f. major Defl., T. caudata Defl. f. pseudocaudata (Defl.) Pop.,T. hirta Cunha var. hirta e T. torosa (Bal.) Tell & Conf.