Published
Hydrolysis evolution in a codigestion reactor at various hydraulic residence times
Evolución de la hidrólisis en un reactor de codigestión, empleando diferentes tiempos de residencia hidráulica
Keywords:
Bioreactor, codigestion, hydraulic residence time, leachate, solid waste (en)biorreactor, codigestión, lixiviado, residuos sólidos, tiempo de residencia hidráulica (es)
The aim of this research is to study the influence of two different hydraulic residence times (HRT's), 5 and 10 days, on the process of hydrolysis-solubilization in a codigestion reactor. Tap water was used to simulate recirculation of a treated leachate. Organic solid waste (OSW) from urban solid waste (USW) and excess sludge from an urban wastewater treatment plant were first characterized and then treated together by anaerobic codigestion. This was done using a 27.2-L total volume pilot scale bioreactor, which was loaded with equal amounts (w/w) of OSW and sludge to a total useful volume of 13-L. The bioreactor was filled with tap water to ensure high humidity. In order to assure suitable mixing and good microbial-substrate contact in the reactor, recirculation of treated effluent was maintained by continuous water flow. The influence of HRT on the process performance was determined through physicochemical characterization of the effluent. Results indicate that HRT is a determinant factor in the efficiency of the system. Reducing HRT increases hydrodynamics and solubilization kinetic rate of organic matter in the bioreactor. Stabilization time of solids is reduced from 20 to 10 days when HRT is shortened from 10 to 5 days.
El objetivo de este trabajo, fue estudiar la influencia de dos tiempos de residencia hidráulica (TRH) diferentes, durante 5 y 10 días, en el proceso de hidrólisis-solubilización en un reactor de codigestión. Se empleó agua de la llave para simular la recirculación de lixiviado tratado, se mezclaron residuos sólidos orgánicos (RSO), seleccionados de residuos sólidos urbanos (RSU), y lodos de una planta de tratamiento de aguas residuales urbanas, se caracterizaron y luego se trataron mediante codigestión anaerobia. A su vez, se empleó un biorreactor piloto, con volumen total de 27.2 L, el cual se cargó con cantidades iguales (peso/peso) de RSO y lodos, que ocuparon un volumen útil de 13 L. El biorreactor se llenó totalmente con agua de la llave, con el fin de asegurar una humedad elevada. Como estrategia para favorecer el mezclado y mantener el contacto biomasa-sustrato, se recirculó agua de manera continua, que simulaba el efluente tratado. La influencia de los TRH en el desempeño del proceso se determinó a través de la caracterización fisicoquímica del efluente. Finalmente, los resultados indican que el TRH es un factor determinante en la eficiencia del sistema; reduciendo el TRH se incrementó la hidrodinámica y la velocidad de la cinética de solubilización de la materia orgánica en el biorreactor. El tiempo de estabilización de los sólidos se redujo de 20 a 10 días, cuando el TRH disminuyó de 10 a 5 días.
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Copyright (c) 2014 Gloria González, Elena Rustrián, Concepción Carreón-Diazconti, Eric Houbron
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