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

Research output: Contribution to journalArticle

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.

Details

Authors
Organisations
External organisations
  • Nova Skantek Environmental Technology (Beijing) Co.
  • Lund University
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Engineering and Technology

Keywords

  • Solid-state anaerobic digestion , Pre-aeration, Inoculum concentration, Substrate to inoculum ratio, Rice straw
Original languageEnglish
Pages (from-to)78-86
Number of pages9
JournalBioresource Technology
Volume224
Publication statusPublished - 2017
Publication categoryResearch
Peer-reviewedYes