title: Production of biohythane from food waste via an integrated system of continuously stirred tank and anaerobic fixed bed reactors.
abstract: The continuous production of biohythane (mixture of biohydrogen and methane) from food waste using an integrated system of a continuously stirred tank reactor (CSTR) and anaerobic fixed bed reactor (AFBR) was carried out in this study. The system performance was evaluated for an operation period of 200days, by stepwise shortening the hydraulic retention time (HRT). An increasing trend of biohydrogen in the CSTR and methane production rate in the AFBR was observed regardless of the HRT shortening. The highest biohydrogen yield in the CSTR and methane yield in the AFBR were 115.2 (±5.3)L H2/kgVSadded and 334.7 (±18.6)L CH4/kgCODadded, respectively. The AFBR presented a stable operation and excellent performance, indicated by the increased methane production rate at each shortened HRT. Besides, recirculation of the AFBR effluent to the CSTR was effective in providing alkalinity, maintaining the pH in optimal ranges (5.0-5.3) for the hydrogen producing bacteria.
authors: Department of Civil and Mechanical Engineering, University of Cassino and Southern Lazio, via Di Biasio 43, 03043 Cassino, FR, Italy; Department of Civil, Architectural and Environmental Engineering, University of Naples Federico II, via Claudio 21, 80125 Naples, Italy.
authors: Martha M
authors: MM
authors: Yeshanew
authors: Department of Mathematics and Applications Renato Caccioppoli, University of Naples Federico II, via Cintia, Monte S. Angelo, I-80126 Naples, Italy. Electronic address: luigi.frunzo@unina.it.
authors: Luigi
authors: L
authors: Frunzo
authors: Department of Civil, Architectural and Environmental Engineering, University of Naples Federico II, via Claudio 21, 80125 Naples, Italy.
authors: Francesco
authors: F
authors: Pirozzi
authors: UNESCO-IHE Institute for Water Education, Westvest 7, 2611 AX Delft, The Netherlands.
authors: Piet N L
authors: PNL
authors: Lens
authors: Department of Civil and Mechanical Engineering, University of Cassino and Southern Lazio, via Di Biasio 43, 03043 Cassino, FR, Italy.
authors: Giovanni
authors: G
authors: Esposito
mesh_terms: D000693:Anaerobiosis; D001419:Bacteria / Q000378:metabolism; D018441:Biofilms; D056804:Biofuels; D019149:Bioreactors / Q000382:microbiology*; D005502:Food; D005735:Garbage; D006859:Hydrogen / Q000378:metabolism*; D008697:Methane / Q000096:biosynthesis*; D018505:Waste Management / Q000295:instrumentation / Q000379:methods*
chemical_list: D056804:Biofuels; D006859:Hydrogen; D008697:Methane
keywords: AFBR; Anaerobic digestion; Biohythane production; CSTR; Food waste; Two-stage