ResumenEn este trabajo se estudia el comportamiento de un lodo activado en cuanto a su capacidad para remover la demanda biológica de oxígeno (DBO) y el nitrógeno amoniacal de un lixiviado previamente tratado en una laguna anaeróbica. El lixiviado pretratado presenta concentraciones de DBO 5 y de N-NH 4 entre 1150 y 3017 mg/l y 1350 y 1750 mg/L respectivamente. La investigación se llevó a cabo en un reactor piloto de 30L, operando a tres factores de carga. Al mayor factor de carga aplicado (0,073 kg DBO 5 /kg SSV día, 0,07 kg N-NH 4 /SSV), operando con un tiempo de residencia hidráulico de 10 días, se logran altas remociones de DBO 5 (98%, 0,24 kg DBO 5 /m 3 ) y de N-NH 4 (99%, 0,15 kg N-NH 4 /m 3 día). En estas condiciones de operación, las concentraciones de DBO 5 (41 mg/L), y de N-NH 4 (10 mg/L) a la salida del lodo activado, cumplirían con holgura la norma chilena de emisión a alcantarillado. Palabras clave: lixiviado, lodo activado, relleno sanitario, amonio, demanda biológica de oxígeno Treatment of Landfill Leachate using Activated Sludge AbstractIn this work the behavior of an activated sludge is studied according to its capacity to remove the biochemical oxygen demand (BOD) and ammonium nitrogen of a leachate previously treated in an anaerobic pond. The BDO 5 and N-NH 4 concentrations in the pretreated leachate ranged from 1150 to 3017 mg/L and between 1350 to 1750 mg/L respectively. The study was carried out in a pilot scale reactor of 30L operating at three load factors. At higher load factor (0.073 kg BOD 5 /kg SSV day, 0.07 kg N-NH 4 /SSV), operating with a hydraulic residence time of 10 days, high BOD 5 (98%, 0.24 kg BOD 5 /m 3 day) and high N-NH 4 removals (99%, 0.15 kg N-NH 4 /m 3 day) were achieved. Under these operating conditions the effluent concentrations of BOD 5 (41 mg/L) and N-NH 4 (10 mg/l) complies with the official Chilean sewage emission standards.
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