Avaliação de desempenho de um sistema reator UASB- filtro biológico percolador operando com e sem decantador secundário

Abstract

This paper intends to assess the influence of a secondary clarifier in the characteristics of an effluent generated by a treatment system that consisted of a UASB reactor followed by a trickling filter. A pilot‐scale treatment system fed with sanitary sewage was used to perform the test. The results obtained in this work indicate that the treatment system operating with the secondary clarifier achieved a better performance and a higher compliance with the discharge parameters. It was found, however, that the trickling filter effluent showed very satisfactory levels of TSS, BOD and COD even before it flowed to the secondary clarifier. The results showed a very promising trend concerning the possible use of a UASB reactor/ trickling filter system without a secondary clarifier. In this particular operational configuration, the trickling filter effluent showed BOD, COD and TSS average values of 43, 115 and 54 mg/L, respectively. The percentages of compliance with the discharge parameters for BOD and TSS (equal to 60 mg/l) were 85% and 75%, respectively