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CARVALHO JR., O. (2008). New configuration of submerged aerated biofilter used in the effluent UASB reactor post-treatment. Ph. D Thesis – Escola de Engenharia de São Carlos, 2008. The main objective of this work was developing a new configuration of submerged aerated biofilter used in UASB reactor post-treatment, with nitrification and denitrification in a single system. Searching operational bases of this new configuration, this research was initially driven by three sequential reactors. These reactors were arranged in the sequences I and II, respectively. The results obtained with these sequential systems took the conception of the project of the new configuration of the proposed biofilter (definitive BF). The results of the sequence I showed high ammoniacal and total nitrogen conversion potential, and also high carbonaceous organic matter removal efficiency. This system, however, not presented potential for denitrification. In the sequence II recirculation between two reactors (anoxic and aerated) of the system was made for such potential increasing. The higher denitrification potential, in this sequence, was observed with recirculation reason, Rc, equal to 2,65 and using 40 %, in volume, of raw sanitary sewage as carbon source. Under these operational conditions, for average affluent concentration of 33,74 mg of N-NH3/L the average effluent concentrations of N-NH3, N-NO2 e N-NO3 were, respectively, equal to 0,16, 0,0026 and 9,72 mg/L. The results of the definitive BF showed that the new proposed configuration is feasible as effluent UASB post-treatment unity, with nitrification and denitrification in a single system, besides high organic matter removal efficiency. Practically in all the phases of this research, all the results obtained attended to the launch standard of ammoniacal nitrogen established by the environmental legislation.

Nova configuração de biofiltro aerado submerso utilizado no pós-tratamento do efluente de reator UASB