Advanced

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)
Please use this url to cite or link to this publication:
author
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
  • 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
2018-04-22 04:24:26
@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},
  keyword      = {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},
  volume       = {224},
  year         = {2017},
}