Comportamento da remoção de matéria organica (DQO) e nitrogênio amoniacal em um reator de leito estruturado operado sob aeração intermitente

The arms of this study was to evaluate the behavior of the removal of organic matter (Chemical Oxygen Demand - COD) and nitrogen (N-ammonia – NH 4 + ) in a reactor of structured and continuous stream bed, operated with intermittent aeration (AI). The reactor used had useful volume of 9.4 L and vertical structures was filled with polyurethane foam. The system was operated for 38 days under intermittent aeration (4h aerated (EA) and non-aerated 2 h (NA)) with recirculation rate of 3 times the inlet flow. The hydraulic retention time (HRT) worked was 16 h. During reactor operation analyzes were performed for determination of pH, alkalinity, temperature, COD, N-ammonia (NH 4 ++) ,  nitrite (N-NO 2 - ),   nitrate  (N-NO 3 - ), Kjeldhl Total Nitrogen (NTK) and volatile suspended solids (VSS ). The analyzes were performed 38 0 days for 3 cycles IA, a total of 18 hours of obtaining data of first effluent collections being made at 1 hr to determine the consumption pattern of COD and N- NH 4 + . The reactor reached an average efficiency of 88% in terms of removing DQO T and 72% removal of NTK cells during the 38 days of operation. From the results obtained in the 18 hour analysis found average removal of N-NH 4 + and DQO T , the EA phase of 92% ± 1 and 49 ± 8% AN and the phase 4 90 ± 46% and ± 6% respectively. From the results it was concluded that the AI did not affect significantly the DQO T removal percentage and ammonia-N in the reactor.