Hydrolysis and acidification of grass silage in leaching bed reactors

Xie, S., Lawlor, P. G., Frost, J. P., Wu, G. and Zhan, X. (2012) Hydrolysis and acidification of grass silage in leaching bed reactors. Bioresource Technology, 114 406-413. doi:10.1016/j.biortech.2012.03.008

Author Xie, S.
Lawlor, P. G.
Frost, J. P.
Wu, G.
Zhan, X.
Title Hydrolysis and acidification of grass silage in leaching bed reactors
Journal name Bioresource Technology   Check publisher's open access policy
ISSN 0960-8524
Publication date 2012-06
Sub-type Article (original research)
DOI 10.1016/j.biortech.2012.03.008
Open Access Status
Volume 114
Start page 406
End page 413
Total pages 8
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Abstract Hydrolysis and acidification of grass silage (GS) was examined in leaching bed reactors (LBRs) under organic loading rates (OLRs) of 0.5, 0.8 and 1.0kg volatile solids (VS)/m 3/day. The LBRs were run in duplicate over five consecutive batch tests (Batch tests 1-5) to examine the effects of pH, leachate dilution and addition of inoculum on the process of hydrolysis and acidification. The highest GS hydrolysis yields of 52-58%, acidification yields of 57-60% and VS removals of 62-66% were obtained in Batch test 4. Increasing OLRs affected the hydrolysis yield negatively. In Batch test 4, the reduction of lignocellulosic materials was up to 74.4% of hemicellulose, 30.1% of cellulose and 9.3% of lignin within 32days. Cellulase activity can be used as an indicator for the hydrolysis process. Methane production from the LBRs only accounted for 10.0-13.8% of the biological methane potential of GS.
Keyword Acidification yield
Anaerobic digestion
Grass silage
Hydrolysis yield
Leaching bed reactor
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Civil Engineering Publications
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Created: Thu, 23 Oct 2014, 16:23:58 EST by Sihuang Xie on behalf of School of Civil Engineering