Abstract

GUARDIA PUEBLA, Yans; RODRIGUEZ PEREZ, Suyén; JIMENEZ HERNANDEZ, Janet  and  SANCHEZ-GIRON RENEDO, Víctor. Performance of a UASB reactor treating coffee wet wastewater. Rev Cie Téc Agr [online]. 2013, vol.22, n.3, pp. 35-41. ISSN 2071-0054.

The present work shows the results obtained in the anaerobic digestion process of coffee wet wastewater processing. An UASB anaerobic reactor was operated in single-stage in mesophilic temperature controlled conditions (37±1ºC). The effect of both organic loading rate (OLR) and hydraulic retention time (HRT) in the anaerobic digestion of coffee wet wastewater was investigated. The OLR values considered in the single-stage UASB reactor varied in a range of 3,6-4,1 kg COD m-3 d-1 and the HRT stayed in a range of 21,5-15,5 hours. The evaluation results show that the best performance of UASB reactor in single-stage was obtained at OLR of 3,6 kg COD m-3 d-1 with an average value of total and soluble COD removal of 77,2% and 83,4%, respectively, and average methane concentration in biogas of 61%. The present study suggests that the anaerobic digestion is suitable to treating coffee wet wastewater.

Keywords : anaerobic digestion; coffee wet wastewater; UASB reactor.

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