Fungal pretreatment of rice straw with Pleurotus ostreatus and Trichoderma reesei to enhance methane production under solid-state anaerobic digestion

•Solid state anaerobic digestion of fungal treated rice straw for biogas production.•Fungal pretreatment caused 33% of lignin loss led to methane yield increased by 120%.•Moisture content and incubation time significantly affected the lignin degradation.•Methane yield increased linearly with selecti...

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Bibliographic Details
Published inApplied energy Vol. 180; pp. 661 - 671
Main Authors Mustafa, Ahmed M., Poulsen, Tjalfe G., Sheng, Kuichuan
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 15.10.2016
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Summary:•Solid state anaerobic digestion of fungal treated rice straw for biogas production.•Fungal pretreatment caused 33% of lignin loss led to methane yield increased by 120%.•Moisture content and incubation time significantly affected the lignin degradation.•Methane yield increased linearly with selectivity value in fungal pretreatment. Rice straw was subjected to fungal pretreatment using Pleurotus ostreatus and Trichoderma reesei to improve its biodegradability and methane production via solid-state anaerobic digestion (SS-AD). Effects of moisture content (65%, 75% and 85%), and incubation time (10, 20 and 30d) on lignin, cellulose, and hemicellulose degradation during fungal pretreatment and methane yield during anaerobic digestion were assessed via comparison to untreated rice straw. Pretreatment with P. ostreatus was most effective at 75% moisture content and 20d incubation resulting in 33.4% lignin removal and a lignin/cellulose removal ratio (selectivity) of 4.2. In comparison Trichoderma reesei was most effective at 75% moisture content and 20 d incubation resulting in 23.6% lignin removal and a lignin/cellulose removal ratio (selectivity) of 2.88. The corresponding methane yields were 263 and 214L/kg volatile solids (VS), which were 120% and 78.3% higher than for the untreated rice straw, respectively.
ISSN:0306-2619
1872-9118
DOI:10.1016/j.apenergy.2016.07.135