Journal
BIORESOURCE TECHNOLOGY
Volume 175, Issue -, Pages 203-208Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2014.10.072
Keywords
Anaerobic digestion; Thermophilic microaerobic pretreatment; Corn straw; Structural characterization analysis
Funding
- National Natural Science Foundation of China [31101918, 21307143]
- 863 Project [2012AA052103]
- National Science and Technology Pillar Program [20140015]
- Key Deployment Project of the Chinese Academy of Sciences [KGCX2-EW-317]
- National Key Technology Research and Development Program of the Ministry of Science and Technology of China [2013BAD22B03]
- Key Research Program of the Chinese Academy of Sciences [KGZD-EW-304]
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Microaerobic process has been proven to be an alternative pretreatment for the anaerobic digestion (AD) process in several studies. In this study, the effect of thermophilic microaerobic pretreatment (TMP) on the AD of corn straw was investigated. Results indicated that TMP process obviously improved the methane yield. The maximum methane yield was obtained at the oxygen loads of 5 ml/g VSsubstrate, which was 16.24% higher than that of untreated group. The modified first order equation analysis showed the TMP process not only accelerated the hydrolysis rates but also reduced the lag-phase time of AD process. The structural characterization analysis showed cellulosic structures of corn straw were partly disrupted during TMP process. The crystallinity indexes were also decreased. In addition, large or destroyed pores and substantial structural disruption were observed after pretreatment. The results showed that TMP is an efficient pretreatment method for the AD of corn straw. (C) 2014 Elsevier Ltd. All rights reserved.
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