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Straws are agricultural residues that can be used to produce biomethane by anaerobic digestion. The methane yield of rice straw is lower than other straws. Steam explosion was investigated as a pretreatment to increase methane production. Pretreatment conditions with varying reaction times (12-30 min) and maximum temperatures (162-240 °C) were applied. The pretreated material was characterized for its composition and thermal and morphological properties. When the steam explosion was performed with a moderate severity parameter of S 0  = 4.1 min, the methane yield was increased by 32% compared to untreated rice straw. This study shows that a harsher pretreatment at S 0  &gt; 4.3 min causes a drastic reduction of methane yield because inert condensation products are formed from hemicelluloses.

Steam Explosion Conditions Highly Influence the Biogas Yield of Rice Straw