Journal
BIORESOURCE TECHNOLOGY
Volume 187, Issue -, Pages 120-127Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2015.03.040
Keywords
Biogas; Co-digestion; Rice straw; Pig manure; Stability
Funding
- National Key Technology Support Program of China [2014BAD02B04]
- Key Laboratory of Environmental and Applied Microbiology, Chengdu Institute of Biology, Chinese Academy of Sciences [KLCAS-2014-01]
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In order to investigate the effects of feedstock ratio and organic loading rate (OLR) on the anaerobic mesophilic co-digestion of rice straw (RS) and pig manure (PM), batch bottle tests (2.5 L) were carried out at volatile solid (VS) ratios of 0:1, 1:2, 1:1, 2:1, and 1:0 (RS/PM), and continuous bench experiments (40 L) were carried out at OLRs of 3.0, 3.6, 4.2, 4.8, 6.0, 8.0, and 12.0 kg VS/(m(3) d) with optimal VS ratio. The results showed that the optimal ratio was 1:1 in terms of biogas yield. Stable biogas production with an average specific biogas production of 413 L/kg VS was obtained at an OLR of 3-8 kg VS/(m(3) d). Anaerobic co-digestion was severely inhibited by the accumulation of volatile fatty acids when the OLR was 12 kg VS/(m(3) d). Further, light and serious foaming were observed at OLR of 8 and 12 kg VS/(m(3) d), respectively. (C) 2015 Elsevier Ltd. All rights reserved.
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