NDLI: Effect of Particle Size on Methane Production of Raw and Alkaline Pre-treated Ensiled Sorghum Forage

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Effect of Particle Size on Methane Production of Raw and Alkaline Pre-treated Ensiled Sorghum Forage

Content Provider	Springer Nature Link
Author	Sambusiti, C. Ficara, E. Malpei, F. Steyer, J. P. Carrère, H.
Copyright Year	2013
Abstract	In Italy, sorghum is a suitable substrate for anaerobic digestion in agricultural biogas plants. However, its complex structure justifies the use of a pre-treatment to improve its anaerobic biodegradability. Thus, the aim of this study was to investigate the impact of particle size on structural changes and methane production from ensiled sorghum forage, with and without the addition of sodium hydroxide (NaOH). Sorghum samples were ground into particles with mean diameters of 2, 1, 0.5 and 0.25 mm. Then, samples milled into 1 and 0.25 mm particle sizes were soaked in a NaOH solution at 10 gNaOH/100gTS dosage and maintained at 55 °C for 12 h. The study revealed that no significant differences in terms of chemical composition were observed between 2 and 0.25 mm particle sizes. Moreover, after the addition of NaOH a similar reduction of lignin (around 30 %), cellulose (around 30–40 %), and hemicelluloses (around 40–45 %), on the solid fraction separated after the pretreatment, was observed for both particle sizes (1 and 0.25 mm). Similar results were confirmed by the Infrared spectroscopy technique which revealed that the crystallinity of cellulose seemed to be not significantly affected by the particle size reduction with and without the addition of NaOH. Finally, milling did not improve the methane production ( $$ 2 7 5. 3 \pm 3. 5 {\text{ mL}}_{{{\text{CH}}_{4} }} /{\text{gVS}} $$ ) and the kinetic constants (0.11 ± 0.01 d$^{−1}$) between 2 and 0.25 mm. On the contrary, by adding the NaOH solution, an increase in both methane yield (by $$ 3 2 4. 5 \pm 0. 7 {\text{ mL}}_{{{\text{CH}}_{ 4} }} /{\text{gVS}} $$ ) and kinetic constants (by 0.16 ± 0.00 d$^{−1}$) was observed, but these results were not significantly influenced by the particle size.
Starting Page	549
Ending Page	556
Page Count	8
File Format	PDF
ISSN	18772641
Journal	Waste and Biomass Valorization
Volume Number	4
Issue Number	3
e-ISSN	1877265X
Language	English
Publisher	Springer Netherlands
Publisher Date	2013-01-22
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ensiled sorghum forage Infrared (FTIR) spectra Methane Particle size Sodium hydroxide Engineering Environment Renewable and Green Energy Industrial Pollution Prevention Waste Management/Waste Technology Environmental Engineering/Biotechnology
Content Type	Text
Resource Type	Article
Subject	Waste Management and Disposal Environmental Engineering Renewable Energy, Sustainability and the Environment

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