Process optimization for recycling of bread waste into bioethanol and biomethane: A circular economy approach
نویسندگان
چکیده
• Conversion feasibility of bread waste (BW) into bioethanol and biomethane. High glucose yield (75–98 g/L) was achieved from acidic/enzymatic hydrolysis BW. Ethanol 0.47 g/g AH BMP 345 CH 4 /g VS ABW + FR obtained. 0.49 EH 379 EBW BW-based ethanol reduces 50% fossil energy use GWP 0.018 kg CO 2 /kg Bread is the second most wasted food in UK with annual wastage 292,000 tons. In present work, utilized for fermentative production by Saccharomyces cerevisiae KL17. Acidic enzymatic saccharification BW carried out resulting highest release 75 97.9 g/L which 73.5 95.9% theoretical yield, respectively. The obtained sugars were fermented initially shake flask followed scale up bioreactor batch fed-batch mode. mode cultivation, maximum titers 111.3, 106.9, 114.9 conversion productivity 0.48, 0.47, g/g, 3.1, 3.0, 3.2 g/L.h pure glucose, glucose-rich acidic hydrolysates, Further to improve process economics, solid residues after (ABW) (EBW) along respective fermentation (FR) pooled subjected anaerobic digestion. residue FR, yielded a biochemical methanation potential (BMP) mL VS, Life cycle assessment showed that total emissions comparable more established feedstocks such as sugarcane maize grain much lower when compared wheat sweet potato. current work demonstrates promising feedstock sustainable biofuel aid circular biorefining strategy. To authors knowledge, this first time, sequential system has been investigated biomethane production. will be aimed at pilot accessed commercial digester.
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ژورنال
عنوان ژورنال: Energy Conversion and Management
سال: 2022
ISSN: ['0196-8904', '1879-2227']
DOI: https://doi.org/10.1016/j.enconman.2022.115784