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Edible Protein Production by Filamentous Fungi using Starch Plant Wastewater
Högskolan i Borås, Akademin för textil, teknik och ekonomi.ORCID-id: 0000-0002-1711-7294
Högskolan i Borås, Akademin för textil, teknik och ekonomi.
Högskolan i Borås, Akademin för textil, teknik och ekonomi.ORCID-id: 0000-0003-4887-2433
2018 (engelsk)Inngår i: Waste and Biomass Valorization, ISSN 1877-2641, s. 1-10Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The process to obtain starch from wheat requires high amounts of water, consequently generating large amounts of wastewater with very high environmental loading. This wastewater is traditionally sent to treatment facilities. This paper introduces an alternative method, where the wastewater of a wheat-starch plant is treated by edible filamentous fungi (Aspergillus oryzae and Rhizopus oryzae) to obtain a protein-rich biomass to be used as e.g. animal feed. The wastewater was taken from the clarified liquid of the first and second decanter (ED1 and ED2, respectively) and from the solid-rich stream (SS), whose carbohydrate and nitrogen concentrations ranged between 15 and 90 and 1.25–1.40 g/L, respectively. A. oryzae showed better performance than R. oryzae, removing more than 80% of COD after 3 days for ED1 and ED2 streams. Additionally, 12 g/L of dry biomass with protein content close to 35% (w/w) was collected, demonstrating the potential of filamentous fungi to be used in wastewater valorization. High content of fermentable solids in the SS sample led to high production of ethanol (10.91 g/L), which can be recovered and contribute to the economics of the process.

sted, utgiver, år, opplag, sider
Springer Netherlands , 2018. s. 1-10
Emneord [en]
Bioethanol, Filamentous fungi, Fungal biomass, Wastewater treatment
HSV kategori
Identifikatorer
URN: urn:nbn:se:hb:diva-14846DOI: 10.1007/s12649-018-0265-2ISI: 000482047500006Scopus ID: 2-s2.0-85042924369ISBN: 18772641 (ISSN) OAI: oai:DiVA.org:hb-14846DiVA, id: diva2:1236337
Tilgjengelig fra: 2018-08-01 Laget: 2018-08-01 Sist oppdatert: 2020-01-29
Inngår i avhandling
1. Fungi-based biorefinery model for food industry waste: progress toward a circular economy
Åpne denne publikasjonen i ny fane eller vindu >>Fungi-based biorefinery model for food industry waste: progress toward a circular economy
2018 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

The food industry, one of the most important industrial sectors worldwide, generates large amounts of biodegradable waste with high organic load. In recent years, the traditional management methods to treat this waste (e.g., landfilling) have been considered not suitable because they do not exploit the potential of the waste material. Alternatively, valorization of food industry waste via a biorefinery model using filamentous fungi is considered to represent an attractive strategy because it minimizes the negative impacts while recovering the nutrients and energy of the waste, in accordance with the concept of the circular economy.

In this thesis, four food processing wastes were utilized as case studies: potato protein liquor (PPL, the soluble fraction of potato starch production waste), the peels wasted during orange juice production, the starchy byproduct of pea protein processes, and the wastewater of a wheat-starch plant. Rhizopus oryzae, a zygomycetous filamentous fungus, was grown with these wastes as a substrate, yielding biomass containing 43% (w/w) protein together with 51% removal of the chemical oxygen demand when cultivated in tenfold-diluted PPL. Moreover, protein-rich biomass was produced using the pea-processing byproduct (55%) and wheat-starch wastewater (51%). In contrast, cultivation in orange peel extract yielded a biomass rich in lipids (20%). The use of PPL was also studied in terms of the economy of fungal cultivation. The biotreatment was found to require only 46% of the capital investment necessary for treating PPL by the traditional strategy (application as fertilizer). In comparison, the ascomycetous fungus Aspergillus oryzae yielded superior results compared to those of R. oryzae when grown in the starchy residues. The high protein content of the fungal biomass encouraged the investigation of its use for bioplastic production. The addition of 20% fungal biomass in a pectin matrix increased the tensile yield of the film and reduced the elongation at break. Moreover, a positive effect on water vapor permeability of the film was also observed.

These results indicate the ability of the filamentous fungi to convert resources wasted by the food industry into new products with positive impacts on the economy and the environment.

sted, utgiver, år, opplag, sider
Borås: Högskolan i Borås, 2018
Serie
Skrifter från Högskolan i Borås, ISSN 0280-381X ; 89
Emneord
filamentous fungi, circular economy, biorefinery, food industry, fungal biomass, bioplastic, resource recovery
HSV kategori
Forskningsprogram
Resursåtervinning
Identifikatorer
urn:nbn:se:hb:diva-14888 (URN)978-91-88838-00-1 (ISBN)978-91-88838-01-8 (ISBN)
Disputas
2018-09-25, 310, University of Borås, Allégatan 1, Borås, 10:00 (engelsk)
Opponent
Tilgjengelig fra: 2018-08-30 Laget: 2018-08-07 Sist oppdatert: 2018-11-26bibliografisk kontrollert

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Souza Filho, Pedro FerreiraZamani, AkramTaherzadeh, Mohammad J

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