Combinations of fungal and milling pretreatments for enhancing rice straw biogas production during solid-state anaerobic digestion

Ahmed M. Mustafa, Tjalfe G. Poulsen, Yihua Xia, Kuichuan Sheng*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

72 Scopus citations

Abstract

Rice straw was pretreated by different combinations of physical (milling) and biological (incubation with Pleurotus ostreatus fungus) treatment to improve its biodegradability and biogas production during solid-state anaerobic digestion (SS-AD). Effects of milling (⩽2 mm) and incubation time (10, 20 and 30 d), on lignin, cellulose, and hemicellulose degradation during fungal pretreatment and methane yield during digestion were assessed by comparison with untreated rice straw. Both incubation time and milling had significant impacts on both lignin removal during fungal pre-treatment and methane yield during digestion. A combination of fungal pretreatment at 30 days followed by milling prior to anaerobic digestion resulted in 30.4% lignin removal, the highest selectivity value (the ratio between relative lignin removal and relative cellulose removal) of 4.22, and the highest methane yield of 258 L/kg VS. This was equivalent to a 165% increase in methane yield from SS-AD compared to untreated rice straw.

Original languageEnglish
Pages (from-to)174-182
Number of pages9
JournalBioresource Technology
Volume224
DOIs
StatePublished - 1 Jan 2017
Externally publishedYes

Keywords

  • Fungal pretreatment
  • Incubation time
  • Methane yield
  • Milling
  • Rice straw
  • Solid-state anaerobic digestion

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