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The effects of pre-aeration and inoculation on solid-state anaerobic digestion of rice straw

Zhou, Ying ; LI, Chao LU ; Liu, Jing LU and Ivo Achu, Nges LU (2017) In Bioresource Technology 224. p.78-86
Abstract
Pre-aeration was investigated for enhancing biodegradation of recalcitrant lignocellulosic structure of rice straw under various low temperatures regimes (25, 35 and 45 °C) and aeration durations (0, 2, 4, 6 and 8 days). It was demonstrated aerated rice straw for 2 days at 35 °C resulted in highest hydrolytic efficiency and biochemical methane potential (BMP) (355.3 ± 18.7 ml CH4/gVS). Furthermore, both methane yields and initiation speeds of the solid-state anaerobic digestion (SS-AD) were inversely proportional to substrate-to-inoculum ratios due to the accumulation of volatile fatty acids (VFAs) and poor mass transfer. The highest methane yield achieved under SS-AD was 234 ml CH4/gVS at TS of 16% which 72% of the BMP. Inoculum dilution... (More)
Pre-aeration was investigated for enhancing biodegradation of recalcitrant lignocellulosic structure of rice straw under various low temperatures regimes (25, 35 and 45 °C) and aeration durations (0, 2, 4, 6 and 8 days). It was demonstrated aerated rice straw for 2 days at 35 °C resulted in highest hydrolytic efficiency and biochemical methane potential (BMP) (355.3 ± 18.7 ml CH4/gVS). Furthermore, both methane yields and initiation speeds of the solid-state anaerobic digestion (SS-AD) were inversely proportional to substrate-to-inoculum ratios due to the accumulation of volatile fatty acids (VFAs) and poor mass transfer. The highest methane yield achieved under SS-AD was 234 ml CH4/gVS at TS of 16% which 72% of the BMP. Inoculum dilution with recycled water improved buffering capacity and mitigated accumulation of VFAs, resulting in an improved SS-AD performance. The combined pre-aeration and SS-AD was therefore established as a viable option to accelerate methane production for lignocellulosic biomass. (Less)
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author
; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Solid-state anaerobic digestion, Pre-aeration, Inoculum concentration, Substrate to inoculum ratio, Rice straw
in
Bioresource Technology
volume
224
pages
9 pages
publisher
Elsevier
external identifiers
  • pmid:27919545
  • scopus:85006506883
  • wos:000395691900010
ISSN
0960-8524
DOI
10.1016/j.biortech.2016.11.104
language
English
LU publication?
yes
id
95e4b0e5-5cc7-4818-8e5e-e3d3104d0582
date added to LUP
2016-12-06 21:41:21
date last changed
2022-04-16 21:37:43
@article{95e4b0e5-5cc7-4818-8e5e-e3d3104d0582,
  abstract     = {{Pre-aeration was investigated for enhancing biodegradation of recalcitrant lignocellulosic structure of rice straw under various low temperatures regimes (25, 35 and 45 °C) and aeration durations (0, 2, 4, 6 and 8 days). It was demonstrated aerated rice straw for 2 days at 35 °C resulted in highest hydrolytic efficiency and biochemical methane potential (BMP) (355.3 ± 18.7 ml CH4/gVS). Furthermore, both methane yields and initiation speeds of the solid-state anaerobic digestion (SS-AD) were inversely proportional to substrate-to-inoculum ratios due to the accumulation of volatile fatty acids (VFAs) and poor mass transfer. The highest methane yield achieved under SS-AD was 234 ml CH4/gVS at TS of 16% which 72% of the BMP. Inoculum dilution with recycled water improved buffering capacity and mitigated accumulation of VFAs, resulting in an improved SS-AD performance. The combined pre-aeration and SS-AD was therefore established as a viable option to accelerate methane production for lignocellulosic biomass.}},
  author       = {{Zhou, Ying and LI, Chao and Liu, Jing and Ivo Achu, Nges}},
  issn         = {{0960-8524}},
  keywords     = {{Solid-state anaerobic digestion; Pre-aeration; Inoculum concentration; Substrate to inoculum ratio; Rice straw}},
  language     = {{eng}},
  pages        = {{78--86}},
  publisher    = {{Elsevier}},
  series       = {{Bioresource Technology}},
  title        = {{The effects of pre-aeration and inoculation on solid-state anaerobic digestion of rice straw}},
  url          = {{http://dx.doi.org/10.1016/j.biortech.2016.11.104}},
  doi          = {{10.1016/j.biortech.2016.11.104}},
  volume       = {{224}},
  year         = {{2017}},
}