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Abstract

Spent mushroom substrate (SMS) is the residual biomass generated after harvesting the fruitbodies of edible and medicinal fungi. Disposal of SMS often leads to serious environmental problems and is financially demanding. Efficient recycling and valorization of SMS are crucial for the sustainable development of the mushroom industry in the frame of the circular economy principles. Several valorization alternatives, such as biofertilizer, soil amendment, wastewater bioremediation agent, ingredient of animal feed formulations, or substrate for new mushroom cultivation cycles, have been proposed for SMS. In this work, we propose a possible valorization option for SMS as raw material for biorefineries. This valorization possibility is supported by the high content of hydrolysable cellulose in SMS and the presence of bioactive compounds, such as polyphenols, polysaccharides, proteins, and sterols. Following a biorefinery concept, we have developed a stepwise processing approach for valorizing. The process includes recovery of bioactive compounds from SMS, enzymatic saccharification of the polysaccharides, bioconversion of obtained sugars into valuable products, and upgrading lignin from the saccharification residue. Our preliminary trials, performed mainly with SMS from Lentinula edodes and Pleurotus spp. (oyster mushrooms) reveal that the proposed approach is a suitable alternative for upgrading the residual substrate from mushroom cultivation.

Keywords

Agricultural residues; bioethanol; biomass; biorefinery; enzymatic hydrolysis; feedstock; spent mushroom substrate

Published in

European Biomass Conference and Exhibition Proceedings
2024, pages: 458-462
Title: European Biomass Conference and Exhibition Proceedings, ETA-Florence Renewable Energies , 2024
Publisher: ETA-Florence Renewable Energies

Conference

32nd European Biomass Conference and Exhibition EUBCE, Marseille, France, 24 June - 27 June, 2024

SLU Authors

UKÄ Subject classification

Bioenergy
Microbiology

Permanent link to this page (URI)

https://res.slu.se/id/publ/142611