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 1.0 kg 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 32 days. 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.
journal_name
Bioresour Technoljournal_title
Bioresource technologyauthors
Xie S,Lawlor PG,Frost JP,Wu G,Zhan Xdoi
10.1016/j.biortech.2012.03.008subject
Has Abstractpub_date
2012-06-01 00:00:00pages
406-13eissn
0960-8524issn
1873-2976pii
S0960-8524(12)00422-1journal_volume
114pub_type
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