Journal
BIORESOURCE TECHNOLOGY
Volume 101, Issue 21, Pages 8179-8184Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2010.06.039
Keywords
Biochemical methane potential; Energy crops; Growth stage; Storage practice; Kinetic model
Funding
- 'Secretaria de Estado de Universidades e Investigacion' from the Spanish Education and Science Ministry
- FECYT
- Economic and Social Research Council [ES/E010989/1] Funding Source: researchfish
- ESRC [ES/E010989/1] Funding Source: UKRI
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The effect of growth stage at harvest and of storage practice on the biochemical methane potential (BMP) of winter wheat was investigated using batch-fed stirred mesophilic digesters. The wheat used was a single variety sown at the same time (autumn) and harvested at 3 different stages in its growth: medium milk (A), soft dough (B) and Caryopsis (C). Wheats (A and B) were ensiled whilst the later harvested material (C) with a higher dry matter content was treated by the alkalage process. The BMP values expressed on the basis of volatile solids (VS) were 0.360 +/- 0.030, 0.346 +/- 0.006 and 0.311 +/- 0.016 I CH4 g(-1) VSadded for A, B and C, respectively. A simple first order kinetic model gave only a poor fit to the experimental data but a close match was obtained using a modified first order pseudo-parallel model which explains the methane production curve on the basis of differences in biodegradability of the plant material. (c) 2010 Elsevier Ltd. All rights reserved.
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