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BioMed Research International
Volume 2014, Article ID 350414, 6 pages
http://dx.doi.org/10.1155/2014/350414
Research Article

Enhanced Solid-State Biogas Production from Lignocellulosic Biomass by Organosolv Pretreatment

1Department of Chemical Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran
2Industrial Biotechnology Group, Institute of Biotechnology and Bioengineering, Isfahan University of Technology, Isfahan 84156-83111, Iran
3Swedish Centre for Resource Recovery, University of Borås, 50190 Borås, Sweden

Received 15 June 2014; Accepted 18 July 2014; Published 5 August 2014

Academic Editor: Meisam Tabatabaei

Copyright © 2014 Safoora Mirmohamadsadeghi et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Organosolv pretreatment was used to improve solid-state anaerobic digestion (SSAD) for methane production from three different lignocellulosic substrates (hardwood elm, softwood pine, and agricultural waste rice straw). Pretreatments were conducted at 150 and 180°C for 30 and 60 min using 75% ethanol solution as an organic solvent with addition of sulfuric acid as a catalyst. The statistical analyses showed that pretreatment temperature was the significant factor affecting methane production. Optimum temperature was 180°C for elmwood while it was 150°C for both pinewood and rice straw. Maximum methane production was 152.7, 93.7, and 71.4 liter per kg carbohydrates (CH), which showed up to 32, 73, and 84% enhancement for rice straw, elmwood, and pinewood, respectively, compared to those from the untreated substrates. An inverse relationship between the total methane yield and the lignin content of the substrates was observed. Kinetic analysis of the methane production showed that the process followed a first-order model for all untreated and pretreated lignocelluloses.