Filtro Biológico Percolador com meio suporte de espuma como pós-tratamento de Reator UASB: perspectivas para a remoção de nitrogênio amoniacal

Abstract

This study evaluated the performance of a polyurethane sponge-based trickling filter (TF.Biobob®) in the post-treatment of UASB reactor effluents in two scenarios: concentrated wastewater and diluted wastewater. For concentrated wastewater (COD = 230 mg/L), the TF.Biobob® (ORL = 1,15 kg-COD/m³reactor.d; HLR = 17,4 m³/m².d) met COD, BOD, TSS, and N-NH4+ discharge standards. For diluted wastewater (COD = 131 mg/L), the UASB effluent met COD and TSS discharge standards, whereas it is expected that the TF-Biobob® (COV = 1,15 kg-COD/m³reactor.d; TAH = 30,7 m³/m².d) can achieve <20 mg/L of N-NH4+ (~25% efficiency). It is important to highlight that, although the OLR was the same in both scenarios, the HLR in the TF-Biobob® would be 76% higher for diluted wastewater, reducing the area requirement by 43% for a given flow rate.