Efectos tóxicos de los metales sobre la actividad microbiana del sistema de lodos activos

Mª Dolores Coello Oviedo, Diego Sales Márquez, José María Quiroga Alonso

Resumen

En este trabajo se estudian los efectos tóxicos que los metales cadmio, cinc y cobre, tienen sobre la actividad microbiana del sistema de lodos activos. Los metales se adicionan al sistema diluidos en un agua residual sintética cuya DQO es de 520 mgO2/L y el ensayo se llevó a cabo durante un tiempo de 8 días. La toxicidad de estos metales se ha determinado a partir de la reducción que experimentan las medidas de actividad tales como la tasa específica de respiración y el porcentaje de células activas presente en el reactor. Los resultados experimentales obtenidos han permitido establecer la siguiente secuencia de toxicidad : Cd>Cu>Zn.

Palabras clave

Lodos activos; Actividad microbiana; Toxicidad; Agua residual; Metales pesados

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Referencias

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