Abstract The organic fraction of municipal waste (OFMW), source-sorted (SS-OFMW) and non-sorted (NS-OFMW), was used as raw material for the sequential production of bioethanol and biogas. Non-isothermal and simultaneous saccharification and fermentation (NSSF) resulted in maximum ethanol concentrations of 51 g/L and 26 g/L for SS-OFMW and NS-OFMW samples, showing overall process yields of up to 80 % and 59 %, respectively, even without subjecting substrate to hydrothermal pretreatment. Subsequently, the solid residues resulting from the fermentation were further subjected to anaerobic digestion (AD), showing a methanogenic potential of 384 ± 6 mL CH4/g of volatile solids (VSin) and 322 ± 3 mL CH4/g VSin, respectively. These methane yields were similar or even higher to those obtained when using non-fermented OFMW substrates (SS-OFMW: 380 ± 18 mL CH4/g VSin and NS-OFMW: 239 ± 4 mL CH4/g VSin), highlighting NSSF as a beneficial step to enhance methane yields during AD. Overall, bioconversion of OFMW would benefit from coupling bioethanol and biogas production since the biogas produced might be further employed as bioenergy source to compensate operational costs.

中文翻译：

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从城市固体废物中连续生产生物乙醇和甲烷：实现成本效益的综合生物精炼战略

摘要 城市垃圾的有机部分 (OFMW)、源分选 (SS-OFMW) 和未分选 (NS-OFMW) 被用作连续生产生物乙醇和沼气的原材料。非等温和同步糖化发酵 (NSSF) 导致 SS-OFMW 和 NS-OFMW 样品的最大乙醇浓度分别为 51 g/L 和 26 g/L，总体过程产率分别高达 80% 和 59% ，甚至无需对基材进行水热预处理。随后，发酵产生的固体残留物进一步进行厌氧消化 (AD)，显示出产甲烷潜力分别为 384 ± 6 mL CH4/g 挥发性固体 (VSin) 和 322 ± 3 mL CH4/g VSin。这些甲烷产率与使用非发酵 OFMW 底物（SS-OFMW：380 ± 18 mL CH4/g VSin 和 NS-OFMW：239 ± 4 mL CH4/g VSin），强调 NSSF 作为提高 AD 期间甲烷产量的有益步骤。总体而言，OFMW 的生物转化将受益于生物乙醇和沼气生产的耦合，因为生产的沼气可能会进一步用作生物能源以补偿运营成本。