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Zero-waste strategy by means of valorization of bread waste

Authors
Jung, Jong-MinKim, Jee YoungKim, Jung-HunKim, Shin MyungJung, SungyupSong, HocheolKwon, Eilhann E.Choi, Yoon-E
Issue Date
10-9월-2022
Publisher
ELSEVIER SCI LTD
Keywords
Circular economy; Zero-waste; Biorefinery; Carbon dioxide; Euglena gracilis; Catalytic pyrolysis
Citation
JOURNAL OF CLEANER PRODUCTION, v.365
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF CLEANER PRODUCTION
Volume
365
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/142865
DOI
10.1016/j.jclepro.2022.132795
ISSN
0959-6526
Abstract
To impose the zero-waste strategy through the diverse valorization route, this study used bread waste (BW) as the model compound. To realize these grand technical challenges, BW was enzymatically hydrolyzed to obtain a monomer sugar compound (glucose), and glucose was used as the carbon substrate in heterotrophic cultivation of Euglena gracilis (E. gracilis). Cultivation of E. gracilis using cultivation medium derived from BW was evaluated from a perspective of an economic viability. In addition, the more production of the target compound (paramylon, beta-1,3-glucan) stemmed from E. gracilis was achieved (1.93 g L-1d-1; 24% higher productivity than that of control). To approach zero waste disposal, bread waste residue (BWR) derived from enzymatic hydrolysis of BW was valorized into syngas. To offer a greener pyrolysis platform for BWR, CO2 was used as a raw material. Here in this study, the mechanistic functionality of CO2 was disclosed. In detail, CO2 reacted with volatile matters (VMs) evolved from BWR, thereby resulting in CO2 reduction. Simultaneously, reduced CO2 also led to oxidation of VMs. Such consecutive gas-phase-reactions (GPRs) played a critical role to enhance CO formation. Lastly, the identified GPRs induced by CO2 were tried to expedite the reaction kinetics in the presence of 5 wt% of Ni/SiO2 catalyst. As a result, the molar concentrations of H2 and CO in gaseous pyrolytic products derived from catalytic pyrolysis in CO2 environment were 2- and 6-times higher, respectively, than that from pyrolysis without catalyst in N2 environment.
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