Article

Eliminación biológica de nutrientes (nitrógeno y fósforo) mediante un proceso discontinuo de fangos activados

01/2001;
Source: OAI

ABSTRACT Los Reactores Biológicos Secuenciales son una alternativa a los sistemas de tratamiento de fangos activados convencionales. Su funcionamiento discontinuo, basado en ciclos que se repiten a lo largo del tiempo, les proporciona una gran flexibilidad para adaptarse a diferentes modalidades de tratamiento y, en concreto, para la eliminación de nutrientes. El estudio realizado con un prototipo de reactor biológico secuencial ha permitido evaluar los procesos de eliminación de materia orgánica y nutrientes (nitrógeno y fósforo) de un agua residual urbana. Las concentraciones medias de materia orgánica, medida como DQO, y de materia en suspensión en el efluente han sido de 40 mg O2/L y 8 mg/L, con unos rendimientos de eliminación del 83 y 88%, respectivamente. Los rendimientos de eliminación de nitrógeno han sido del 53%, con una concentración media en el efluente de 14 mg N/L. Por otra parte, la presencia de nitratos en el líquido de mezcla ha inhibido el proceso de asimilación biológica de fósforo en la mayor parte de los ciclos estudiados. En las ocasiones en que no ha sido así, se han alcanzado rendimientos de eliminación de fósforo del 67%, con concentraciones en el efluente próximas a 2 mg P/L.

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