Title:
Spent Substrate from Mushroom Cultivation - Potential Feedstock for Biorefinery Exploitation
Author(s):
Martín, C., Xiong, S., Passoth, V., Strætkvern, K.O., Klausen, S.J., Romero-Soto, L.A.
Document(s):
Paper
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:
bioethanol, biomass, biorefinery, enzymatic hydrolysis, agroindustrial residues, feedstock, spent mushroom substrate
Topic:
Biomass, Bio-based Products and Bioenergy Integration
Subtopic:
Biomass use in biorefineries
Event:
32nd European Biomass Conference and Exhibition
Session:
3CV.6.4
Pages:
458 - 462
ISBN:
978-88-89407-24-0
Paper DOI:
10.5071/32ndEUBCE2024-3CV.6.4
Price:
FREE
