Journal
BIORESOURCE TECHNOLOGY
Volume 192, Issue -, Pages 682-688Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2015.06.034
Keywords
Giant reed; Ensilage; Urea addition; Lactic acid; Anaerobic digestion
Funding
- USDA NIFA Biomass Research and Development Initiative Program [2012-10008-20302]
- NIFA [2012-10008-20302, 577945] Funding Source: Federal RePORTER
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The effect of urea addition on giant reed ensilage and sequential anaerobic digestion (AD) of the ensiled giant reed was evaluated. The dry matter loss during ensilage (up to 90 days) with or without urea addition was about 1%. Addition of 2% urea enhanced production of lactic acid by about 4 times, and reduced production of propionic acid by 2-8 times. Besides, urea addition reduced degradation of cellulose and hemicellulose, and increased degradation of lignin in giant reed during ensilage. Ensilage with or without urea addition had no significant effects on the enzymatic digestibility of giant reed, but ensilage with urea addition achieved a cumulative methane yield of 173 L/kg VS, which was 18% higher than that of fresh giant reed. The improved methane yield of giant reed could be attributed to the production of organic acids and ethanol during ensilage. (C) 2015 Elsevier Ltd. All rights reserved.
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