Process optimization for recycling of bread waste into bioethanol and biomethane: A circular economy approach

Vivek Narisetty; Sanjay Nagarajan; Siddharth GadkariVivek V. RanadeJingxin ZhangKumar PatchigollaAmit BhatnagarMukesh Kumar AwasthiAshok PandeyVinod Kumar

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Process optimization for recycling of bread waste into bioethanol and biomethane: A circular economy approach

机译：Process optimization for recycling of bread waste into bioethanol and biomethane: A circular economy approach

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Bread is the second most wasted food in the UK with annual wastage of 292,000 tons. In the present work, bread waste (BW) was utilized for fermentative production of ethanol by Saccharomyces cerevisiae KL17. Acidic and enzymatic saccharification of BW was carried out resulting in the highest glucose release of 75 and 97.9 g/L which is 73.5 and 95.9% of theoretical yield, respectively. The obtained sugars were fermented into ethanol initially in shake flask followed by scale up in bioreactor in batch and fed-batch mode. In the fed-batch mode of cultivation, the maximum ethanol titers of 111.3, 106.9, and 114.9 g/L with conversion yield and productivity of 0.48, 0.47, and 0.49 g/g, and 3.1, 3.0, and 3.2 g/L.h was achieved from pure glucose, glucose-rich acidic and enzymatic hydrolysates, respectively. Further to improve the process economics, the solid residues after acidic (ABW) and enzymatic (EBW) hydrolysis of BW along with respective fermentation residues (FR) obtained after the ethanol production were pooled and subjected to anaerobic digestion. The solid residue from ABW + FR, and EBW + FR yielded a biochemical methanation potential (BMP) of 345 and 379 mL CH_4/g VS, respectively. Life cycle assessment of the process showed that the total emissions for ethanol production from BW were comparable to the emissions from more established feedstocks such as sugarcane and maize grain and much lower when compared to wheat and sweet potato. The current work demonstrates BW as promising feedstock for sustainable biofuel production with the aid of circular biorefining strategy. To the authors knowledge, this is the first time, such a sequential system has been investigated with BW for ethanol and biomethane production. Further work will be aimed at ethanol production at pilot scale and BMP will be accessed in a commercial anaerobic digester.

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《Energy conversion & management》 |2022年第8期|115784.1-115784.14|共14页
作者
Vivek Narisetty; Sanjay Nagarajan; Siddharth GadkariVivek V. RanadeJingxin ZhangKumar PatchigollaAmit BhatnagarMukesh Kumar AwasthiAshok PandeyVinod Kumar;
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作者单位

School of Water, Energy and Environment, Cranfield University, Cranfield MK43 OAL, United Kingdom;

Multiphase Flows, Reactors and Intensification Group, School of Chemistry and Chemical Engineering, Queen's University Belfast, Belfast BT9 5AG, United Kingdom,Sustainable Environment Research Centre, Alfred Russel Wallace Building, University of South Wa;

Department of Chemical and Process Engineering, University of Surrey, Guildford GU2 7XH, United KingdomMultiphase Flows, Reactors and Intensification Group, School of Chemistry and Chemical Engineering, Queen's University Belfast, Belfast BT9 5AG, United Kingdom,Bernal Institute, University of Limerick, Limerick V94T9PX, IrelandChina-UK Low Carbon College, Shanghai Jiao Tong University, Shanghai 201306, ChinaDepartment of Separation Science, LUT School of Engineering Science, LUT University, Sammonkatu 12, FI-50130 Mikkeli, FinlandCollege of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province 712100, ChinaCentre for Innovation and Translational Research CSIR-Indian Institute of Toxicology Research (CSIR-ITTR), 31MG Marg, Lucknow 226 001, India,Centre for Energy and Environmental Sustainability, Lucknow 226 029, India,Sustainability Cluster, School of EnginSchool of Water, Energy and Environment, Cranfield University, Cranfield MK43 OAL, United Kingdom,Department of Chemical Engineering, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种英语
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Bread waste; Saccharification; Bioethanol; Saccharomyces cerevisiae; Biomethane; Life cycle assessment;

Process optimization for recycling of bread waste into bioethanol and biomethane: A circular economy approach

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