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Effect of alkaline pre-treatment on the anaerobic biodegradability of coffee husk/Efecto del pre-tratamiento alcalino en la biodegradabilidad anaerobia de la cascara del cafe

Revista Facultad de Ingeniería, 2019-07 (92), p.36 [Peer Reviewed Journal]

COPYRIGHT 2019 Universidad de Antioquia, Facultad de Ingenieria ;ISSN: 0120-6230 ;EISSN: 2422-2844 ;DOI: 10.17533/udea.redin.20190516

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  • Title:
    Effect of alkaline pre-treatment on the anaerobic biodegradability of coffee husk/Efecto del pre-tratamiento alcalino en la biodegradabilidad anaerobia de la cascara del cafe
  • Author: De la Cruz-Martorell, K ; Gomez-Salcedo, Y ; Santander, Y ; Mera, D.J. Catagua ; Mendoza, J.C.D ; Pereda-Reyes, I
  • Subjects: Biphenyl (Compound) ; Lignin ; Methane ; Phenols (Class of compounds) ; Polyphenols ; Production management ; Restaurants
  • Is Part Of: Revista Facultad de Ingeniería, 2019-07 (92), p.36
  • Description: The present paper deals with the mono-digestion of coffee husk during the operation of batch reactors and semi-continuous stirred tank reactor (S-CSTR) using both pre-treated residual at 3% Ca[(OH).sub.2] and without pre-treatment. The semi-continuous operation was carried out in 4 stages at different organic loading rate (OLR, [[g.sub.VS] [L.sup.-1] [d.sup.-1]]) and hydraulic retention time (HRT, [d]) (OLR:HRT) ratios (0.1:90, 0.2:90, 0.2:45 and 0.2:30). As a result of the pre-treatment, up to 223% of the organic matter solubilisation was obtained. However, pre-treatment did not provide better results in biodegradability, observing a negative trend in methane yield when operating in S-CSTR, due to the accumulation of compounds from the fractionation of the lignin as is the case of polyphenols. The operation was further developed using the residual without pre-treatment. The highest methane yield was obtained at 45:0.2 when using the residual without pre-treatment being with 277 [mL.sub.CH4] [g.sub.VS-1], for a methane productivity of 1.1 L [L.sup.-1] [d.sup.-1]. When implementing the 30:0.2 ratio, a biomass washout was observed in the system, so it is recommended to operate at low OLR and high HRT when treating solid coffee wastes. KEYWORDS: Anaerobic digestion, alkaline pre-treatment, methane yield, lignocellulosic biomass, polyphenols La biodegradabilidad de la cascara del cafe durante la operacion de reactores en discontinuo y en tanque agitado semi-continuo, se evaluo empleando el residual pre-tratado con Ca[(OH).sub.2] al 3% y sin pre-tratar. La operacion en regimen semi-continuo se llevo a cabo en 4 etapas empleando relaciones de carga organica volumetrica (COV, [[g.sub.SV] [L.sup.-1] [d.sup.-1]]) y de tiempo de retencion hidraulico (TRH, [d]) (COV:TRH) de 0,1:90; 0,2:90; 0,2:45 y 0,2:30. Como resultado del pre-tratamiento se obtiene hasta 223% de solubilizacion de la materia organica. Sin embargo, el pre-tratamiento no brindo mejores resultados en la biodegradabilidad, observandose una tendencia negativa en el rendimiento de metano en la operacion en semi-continuo, debido a la acumulacion de compuestos resultantes del fraccionamiento de la lignina como es el caso de polifenoles, por lo que se decidio continuar empleando el residual sin pre-tratar. El mayor rendimiento de metano se obtuvo a 45:0,2 cuando se utilizo el residual sin pre-tratar obteniendose 277 [mL.sub.CH4] [g.sub.SV.sup.-1], para una productividad de metano de 1,1 L [L.sup.-1] [d.sup.-1]. Al implementar la condicion de 0,2: 30 se observo un lavado de biomasa en el sistema por lo que se recomienda operar a bajas COVy elevados TRH al tratar residuales solidos cafetaleros. Digestion anaerobia, pre-tratamiento alcalino, rendimiento de metano, biomasa lignocelulosica, polifenoles
  • Publisher: Universidad de Antioquia, Facultad de Ingenieria
  • Language: Spanish
  • Identifier: ISSN: 0120-6230
    EISSN: 2422-2844
    DOI: 10.17533/udea.redin.20190516
  • Source: ProQuest Central
    DOAJ Directory of Open Access Journals
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