Digestión anaerobia en dos fases de las aguas residuales del beneficiado húmedo de café: el efecto de la recirculación en el funcionamiento del proceso anaerobio
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Abstract
El presente trabajo muestra los resultados de la evaluación de la digestión anaerobia en dos fases para el tratamiento de las aguas residuales del beneficiado húmedo de café. Se est udió el efecto de la recirculación en el proceso de digestión anaerobia. Fueron evaluados dos valores de cargas orgánicas volumétricas (COV) generales de 4,2 y 5,7 kgCOD·m-3·d , con los mismos tiempo de retención hidráulica (TRH) generales de 21,5 horas. En el sistema en dos fases fueron aplicadas dos tasas de recirculación de 0,4 y 1,0, del efluente de un reactor híbrido metanogénico UASB-UAF hacia un reactor acidogénico UASB. En el sistema anaerobio con una tasa de recirculación de 1,0, la eficiencia de eliminación de la demanda química de oxígeno (DQO) fue del 90%. La introducción de la recirculación disminuyó la concentración de los ácidos grasos volátiles (AGV), pero no cambió su composición, lo que indica que el patrón de degradación de esos ácidos no cambió. La presencia de un reactor acidogénico en un sistema en dos fases mejora la estabilidad del proceso de digestión anaerobia u aumenta la eficiencia del digestor metanogénico.
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