(2022) Journal of Cleaner Production_Zero-waste strategy by means of valorization of bread waste
Jung J.-M., Kim J.Y., Kim J.-H., Kim S.M., Jung S., Song H., Kwon E.E., Choi Y.-E.
(Elsevier Ltd) Journal of Cleaner Production ISSN: 9596526 Vol.365 Issue. Article No.132795 DOI: 10.1016/j.jclepro.2022.132795
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, β-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. © 2022 Elsevier Ltd
This research was supported by NRF ( National Research Foundation of Korea ) grant funded by the Korean Government (MSIT; 2019R1A2C2087449 and 2020R1A2C1010748).
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