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Research article - Peer-reviewed, 2021

Cultivation of Pleurotus ostreatus mushroom on substrates made of cellulose fibre rejects: product quality and spent substrate fuel properties

Grimm, Alejandro; Xiong, Shaojun; Eilertsen, Lill; Chen, Feng

Abstract

This paper explores an alternative valorisation method for high-moisture content waste streams from the pulp and paper industry. Cellulose fibre rejects from industrial-scale recycling/pulping of waste paper was used as an ingredient in substrates for cultivation of Pleurotus ostreatus, commonly known as oyster mushroom. Three substrates with 40, 60, and 80 wt% fibre rejects were tested, and a conventional substrate formula based on birch (Betula ssp.) sawdust was used for comparison. The spent mushroom substrate (SMS) fuel characteristics were assessed through ashing procedures. Mycelium growth was faster on substrates based on fibre rejects. The average biological efficiencies of the first flush of fruit bodies were between 29 and 36% compared to 42% for birch sawdust substrates. The fruit bodies had good nutritional values, i.e., crude protein (22-25 wt% d.b.), crude fat (3-3.5 wt% d.b.), crude fibre (8-10 wt% d.b.), and carbohydrates (57-62 wt% d.b.). The concentrations of heavy metals, 5-10 mu g/kg Pb, 19-28 mu g/kg Cd, 5-6 mu g/kg Hg, and 26-53 mu g/kg As were well below the limit values for food products set in EU regulations. The SMS could be used as fuel for direct combustion or co-combusted with other biomasses.

Keywords

Edible fungus; Nutritional values; Heavy metals; Fuel characterization; Circular economy

Published in

Waste and Biomass Valorization
2021, volume: 12, pages: 4331-4340

Authors' information

Swedish University of Agricultural Sciences, Department of Forest Biomaterials and Technology
Swedish University of Agricultural Sciences, Department of Forest Biomaterials and Technology
Swedish University of Agricultural Sciences, Department of Forest Biomaterials and Technology
Swedish University of Agricultural Sciences, Department of Forest Genetics and Plant Physiology
Huang, Renyuan
Swedfungi AB
Atterhem, Lars
Biosteam AB
Swedish University of Agricultural Sciences, Department of Forest Biomaterials and Technology

Sustainable Development Goals

SDG7 Affordable and clean energy
SDG2 Zero hunger

UKÄ Subject classification

Bioenergy

Publication Identifiers

DOI: https://doi.org/10.1007/s12649-020-01311-y

URI (permanent link to this page)

https://res.slu.se/id/publ/109208