RESUMO

A pilot plant anaerobic/anoxic/oxic (A2/O) system fed with domestic wastewater was operated to examine the effect of varying different types of carbon source (acetic acid, propionic acid, and glucose), added as a complement to the wastewater, on the (1) process performance and (2) microbial population. The operational condition that lead to a significant removal of total nitrogen (82%) was achieved with acetic acid. When the complementary carbon source was propionic acid, an improved removal efficiency of orthophosphate (97%) was observed. Because this finding was concurrent with higher polyphosphate-accumulating organism (PAO) population fractions detected using fluorescent in situ hybridization analysis (41.9 +/- 3.0%), it suggests that members of PAO populations that were able to reduce nitrate gained importance over PAO members that could not, thus improving the denitrifying phosphorus removal.

Assuntos

Betaproteobacteria/metabolismo , Carbono/metabolismo , Glicogênio/metabolismo , Polifosfatos/metabolismo , Poluentes da Água/isolamento & purificação , Purificação da Água/métodos , Ácido Acético/metabolismo , Aerobiose , Anaerobiose , Betaproteobacteria/crescimento & desenvolvimento , Análise da Demanda Biológica de Oxigênio , Glucose/metabolismo , Nitratos/metabolismo , Nitritos/metabolismo , Nitrogênio/isolamento & purificação , Nitrogênio/metabolismo , Oxigênio/metabolismo , Projetos Piloto , Polifosfatos/isolamento & purificação , Propionatos/metabolismo , Esgotos/microbiologia