Abstract
AbstractThe EU's bioeconomy strategy has a strong commitment to the development of biotechnological approaches to convert municipal solid biowastes into value‐added products. In this context, the current study investigated the thermophilic co‐fermentation of pruning lignocellulosic and food wastes to co‐produce hydrogen and carboxylic acids. Steam explosion pretreatment considerably enhanced the chemical oxygen demand (COD) solubilization reaching values up to 80% even with high lignocellulosic waste content. Acidification yield in terms of COD was strongly dependent on thermal pretreatment, varying from 20–30% up to ca. 60% with thermal pretreatment of the mixed urban waste. Under the best tested conditions, thermophilic co‐fermentation produced up to 162 ± 5 mlH2 gCOD−1. This hydrogen production decreased notably with the increase in the lignocellulosic fraction in the feed, the effect being stronger in the absence of thermal treatment. The results clearly showed a positive synergy effect in the overall efficiency of acidogenic fermentation and the strong dependence of carboxylic acid distribution on the initial composition of the feed. Values up to 0.58 gCOD of carboxylic acids per gCOD added were achieved with thermal pretreatment of the mixed urban waste, resulting in 93% acidification. © 2021 Society of Chemical Industry and John Wiley & Sons, Ltd
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