Conference article

Thermophilic Anaerobic Digestion Modeling of Lignocellulosic Hot Water Extract using ADM1

Zahra Nikbakht Kenarsari
Department of Process, Energy and Environmental Technology, University of South-Eastern Norway

Nirmal Ghimire
Department of Process, Energy and Environmental Technology, University of South-Eastern Norway

Rune Bakke
Department of Process, Energy and Environmental Technology, University of South-Eastern Norway

Wenche Hennie Bergland
Department of Process, Energy and Environmental Technology, University of South-Eastern Norway

Download articlehttps://doi.org/10.3384/ecp20170125

Published in: Proceedings of The 60th SIMS Conference on Simulation and Modelling SIMS 2019, August 12-16, Västerås, Sweden

Linköping Electronic Conference Proceedings 170:19, s. 125-131

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Published: 2020-01-24

ISBN: 978-91-7929-897-5

ISSN: 1650-3686 (print), 1650-3740 (online)

Abstract

Lignocellulosic biomass is abundant and can become a major feed for anaerobic digestion methane production if its natural recalcitrance is overcome by pretreatment. Bio-degradable organic molecules were extracted by hot water (to produce “hydrolysate”) from wood (Norway spruce). A high rate anaerobic sludge bed reactor fed the hydrolysate was modeled by the IWA Anaerobic Digestion Model No.1 (ADM1). Biodegradability kinetics for the hydrolysate material was obtained from batch tests at thermophilic condition, and the hydrolysis kinetic coefficient of carbohydrate was found. Thus the kinetic coefficient was equal to 0.44 1/d was used to simulate UASB reactor performance at 55°C and comparing results to measured parameters from an experimental reactor at five different organic loading rates. The simulation results correlated well with the experimental results for biogas production rate, biogas composition and chemical oxygen demand. This shows that ADM1 is a powerful tool to predict the behavior of thermophilic anaerobic digestion (AD) of pretreated lignocellulosic feed using standard ADM1 parameters except for hydrolysis kinetics. Hydrolysis was identified as the overall rate limiting step in AD of such feed in UASB.

Keywords

thermophilic anaerobic digestion, OLR, lignocellulosic hydrolysate, hydrolysis kinetic, ADM1

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