Modification of the anaerobic digestion model No.1 (ADM1) for lignocellulosic biomass
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Rajamangala University
Chulalongkorn University
Online publication date: 2018-04-24
Publication date: 2018-04-24
Eurasian J Anal Chem 2018;13(3):emEJAC03128
The lignocellulosic biomass will be the resource for an alternative energy in the future. To evaluate the dynamical products from anaerobic digestion process such as sugars, VFA and gas product, the ADM1 model can be modified to apply for lignocellulosic biomass digestion. The selected lignocellulosic biomasses as Napier grass, empty palm fruit bunch and acacia leave which had different cellulose and lignin content was selected to research in this part. This difference between based and modified model was additional term as cellulose. The results depicted that the term of fiber and solubilization of biomass controlled anaerobic digestion process. The simulation results indicated that the modification model based on ADM1 model was able to describe the anaerobic digestion process from lignocellulosic biomass. The calibrated variable in the model was that the hard digestible content as cellulose (Xfi) was additional term in dynamic state variable in DAE system. The estimated value of cellulose hydrolysis rate constant (khyd,ce) was 0.01 d-1. The hydrolysis rate constant of easy digestible carbohydrates (khyd,ch), proteins (khyd,pr) and lipids (khyd,li) was calibrated to 0.03 d-1. The disintegration rate of lignocellulosic biomass (kdis) was calibrated to 0.025 d-1. The different by-products from various lignocellulosic biomass was the composition in substrate, which is validated as stoichiometric parameter (fcomposition,xc) in hydrolysis step in based model. The benefit of this work is to reduce the time and cost consuming in evaluating sugar, VFA and gas product from lignocellulosic biomass digestion.