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Optimization of high solids batch anaerobic co-digestion of lignocellulosic biomass and cow dung under mesophilic temperature conditions

Authors:

A.L. Wickramaarachchi ,

University of Moratuwa, LK
About A.L.
Department of Chemical and Process Engineering
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P.G. Rathnasiri,

University of Moratuwa, LK
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M. Torrijos,

INRAE,Univ Montpellier, FR
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R. Escudie,

INRAE,Univ Montpellier, FR
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M. Narayana

University of Moratuwa, LK
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Abstract

Anaerobic digestion is applied to recover energy from rice straw (RS) which is a lignocellulosic agricultural residue produced in huge quantities in Asia and Africa. Because of the high solids content of this feedstock, high solids anaerobic co-digestion in batch mode must be further investigated. In this study, optimal operating conditions for the anaerobic co-digestion of RS with cow dung (CD) in batch mode, with and without leachate recirculation, were assessed under mesophilic temperature conditions. Preliminary experiments carried out in 2 L batch reactors confirmed that the concentration of RS in the mixture of substrates S0 , in g VSRS/kg of mixture is an important parameter. Only batch reactors with the lowest So values (29 g VSRS/kg) produced biogas and rest of the reactors followed a long lag phase. The use of digestate from a previous batch as an inoculum was investigated with So values of 29 and 55 g VSRS/kg. Use of the digestate with So of 29 g VSRS/kg improved both initial degradation kinetics and the methane yield measured after 60 days. However, at So of 55 g VSRS/kg, the degradation kinetics were affected and after two months, 32 % of the biodegradable organic matter could not be eliminated. When leachate recirculation was performed in 6 L leach-bed reactors (LBRs) with So between 30 and 65 g VS lowest SRS/kg, the highest methane yield was recorded at the lowest So value. It can be concluded that under batch mode, an RS concentration around 30 g VSRS/kg may be recommended for industrial applications. 

How to Cite: Wickramaarachchi, A.L., Rathnasiri, P.G., Torrijos, M., Escudie, R. and Narayana, M., 2022. Optimization of high solids batch anaerobic co-digestion of lignocellulosic biomass and cow dung under mesophilic temperature conditions. Journal of the National Science Foundation of Sri Lanka, 50(1), pp.125–136. DOI: http://doi.org/10.4038/jnsfsr.v50i1.10358
Published on 10 Apr 2022.
Peer Reviewed

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