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Hydrothermal processing as pretreatment for efficient production of ethanol and biogas from municipal solid waste

Mahmoodi, Peyman, Karimi, Keikhosro, Taherzadeh, Mohammad J.
Bioresource technology 2018 v.261 pp. 166-175
Mucor, biogas, energy, enzymatic hydrolysis, ethanol, ethanol production, fermentation, fungi, gas production (biological), glucose, hot water treatment, lignocellulose, methane production, municipal solid waste
Organic fraction of municipal solid waste (OFMSW) is dominated by carbohydrates, including starch-based and lignocellulosic materials. The OFMSW was hydrothermally pretreated at 100–160 °C for 0–60 min, and then assessed for enzymatic ethanol production, followed by biogas production from the stillage. The highest glucose yield of 520 g/Kg of dry OFMSW, corresponding to 131% increase compared to that of the untreated OFMSW, was obtained after the pretreatment and enzymatic hydrolysis. Through ethanolic fermentation by an inhibitory tolerant fungus, Mucor indicus, 191.10 g ethanol/Kg of dry OFMSW was obtained, which was a 140.9% improvement in the ethanol yield compared to that from the untreated one. Methane production from the stillage (waste residues) resulted in 156 L/Kg OFMSW. In other words, a total of 10,774 KJ energy/Kg of dry OFMSW was generated at the best conditions.