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  • 1.
    Ferreira, Jorge A.
    et al.
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Mahboubi, Amir
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Lennartsson, Patrik R.
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Taherzadeh, Mohammad J
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Waste biorefineries using filamentous ascomycetes fungi: Present status and future prospects2016Ingår i: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 215, nr sept, s. 334-345Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Filamentous ascomycetes fungi have had important roles in natural cycles, and are already used industrially for e.g. supplying of citric, gluconic and itaconic acids as well as many enzymes. Faster human activities result in higher consumption of our resources and producing more wastes. Therefore, these fungi can be explored to use their capabilities to convert back wastes to resources. The present paper reviews the capabilities of these fungi in growing on various residuals, producing lignocellulose-degrading enzymes and production of organic acids, ethanol, pigments, etc. Particular attention has been on Aspergillus, Fusarium, Neurospora and Monascus genera. Since various species are used for production of human food, their biomass can be considered for feed applications and so biomass compositional characteristics as well as aspects related to culture in bioreactor are also provided. The review has been further complemented with future research avenues.[on SciFinder (R)]

  • 2.
    Karimi, Sajjad
    et al.
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Mahboobi Soofiani, Nasrollah
    Fisheries Division, Department of Natural Resources, Isfahan University of Technology.
    Mahboubi, Amir
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Taherzadeh, Mohammad J
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Use of Organic Wastes and Industrial By-Products to Produce Filamentous Fungi with Potential as Aqua-Feed Ingredients2018Ingår i: Sustainability, E-ISSN 2071-1050, Vol. 10, nr 9Artikel i tidskrift (Övrigt vetenskapligt)
    Abstract [en]

    Organic-rich waste and industrial by-product streams, generated in enormous amounts on a daily basis, contain substantial amounts of nutrients that are worthy of recovery. Biological conversion of organic-waste streams using filamentous fungi is a promising approach to convert nutrients into value-added bioproducts, such as fungal biomass. High-protein fungal biomass contains different kinds and levels of amino acids, fatty acids, immunostimulants, antioxidants, pigments, etc., which make it a potential choice for application in animal feed supplementation. Considering the challenges long faced by the aquaculture industry in fishmeal production due to the increasing prices and environmental concerns, the aquaculture industry is forced to provide alternative protein-rich sources to replace conventional fishmeal. In this review, the possibilities of utilization of filamentous fungi biomass cultivated on organic-rich waste streams, as an alternative nutrient source in fish feed, were thoroughly reviewed.

  • 3.
    Mahboubi, Amir
    et al.
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Cayli, Beray
    Department of Environmental Sciences and Engineering, Graduate School of Science, Engineering and Technology.
    Bulkan, Gülru
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Doyen, Wim
    Flemish Institute for Technological Research.
    De Wever, Heleen
    Flemish Institute for Technological Research.
    Taherzadeh, Mohammad J
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Removal of Bacterial Contamination from Bioethanol Fermentation System Using Membrane Bioreactor2018Ingår i: Fermentation, Vol. 4, nr 4Artikel i tidskrift (Övrigt vetenskapligt)
    Abstract [en]

    A major issue hindering efficient industrial ethanol fermentation from sugar-based feedstock is excessive unwanted bacterial contamination. In industrial scale fermentation, reaching complete sterility is costly, laborious, and difficult to sustain in long-term operation. A physical selective separation of a co-culture of Saccharomyces cerevisiae and an Enterobacter cloacae complex from a buffer solution and fermentation media at dilution rates of 0.1–1 1/h were examined using an immersed membrane bioreactor (iMBR). The effect of the presence of yeast, inoculum size, membrane pore size, and surface area, backwashing and dilution rate on bacteria removal were assessed by evaluating changes in the filtration conditions, medium turbidity, and concentration of compounds and cell biomass. The results showed that using the iMBR with dilution rate of 0.5 1/h results in successful removal of 93% of contaminating bacteria in the single culture and nearly complete bacteria decontamination in yeast-bacteria co-culture. During continuous fermentation, application of lower permeate fluxes provided a stable filtration of the mixed culture with enhanced bacteria washout. This physical selective separation of bacteria from yeast can enhance final ethanol quality and yields, process profitability, yeast metabolic activity, and decrease downstream processing costs.

  • 4.
    Mahboubi, Amir
    et al.
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Ferreira, Jorge A.
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Taherzadeh, Mohammad J
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Lennartsson, Patrik R.
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Production of Fungal Biomass for Feed, Fatty Acids, and Glycerol by Aspergillus oryzae from Fat-Rich Dairy Substrates2017Ingår i: Fermentation, ISSN 2311-5637, Vol. 3, nr 4Artikel i tidskrift (Övrigt vetenskapligt)
    Abstract [en]

    Dairy waste is a complex mixture of nutrients requiring an integrated strategy for valorization into various products. The present work adds insights into the conversion of fat-rich dairy products into biomass, glycerol, and fatty acids via submerged cultivation with edible filamentous fungi. The pH influenced fat degradation, where Aspergillus oryzae lipase was more active at neutral than acidic pH (17 g/L vs. 0.5 g/L of released glycerol); the same trend was found during cultivation in crème fraiche (12 g/L vs. 1.7 g/L of released glycerol). In addition to glycerol, as a result of fat degradation, up to 3.6 and 4.5 g/L of myristic and palmitic acid, respectively, were released during A. oryzae growth in cream. The fungus was also able to grow in media containing 16 g/L of lactic acid, a common contaminant of dairy waste, being beneficial to naturally increase the initial acidic pH and trigger fat degradation. Considering that lactose consumption is suppressed in fat-rich media, a two-stage cultivation for conversion of dairy waste is also proposed in this work. Such an approach would provide biomass for possibly feed or human consumption, fatty acids, and an effluent of low organic matter tackling environmental and social problems associated with the dairy sector.

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  • 5.
    Mahboubi, Amir
    et al.
    Högskolan i Borås, Akademin för textil, teknik och ekonomi. Biotechnology.
    Ferreira, Jorge A.
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Taherzadeh, Mohammad J
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Lennartsson, Patrik R.
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Value-added products from dairy waste using edible fungi2017Ingår i: Waste Management, ISSN 0956-053X, E-ISSN 1879-2456, Vol. 59, s. 518-525Artikel i tidskrift (Refereegranskat)
  • 6.
    Mahboubi, Amir
    et al.
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Lundin, Magnus
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Doyen, Wim
    The Flemish Institute for Technological Research.
    De Wever, Heleen
    The Flemish Institute for Technological Research.
    Taherzadeh, Mohammad J
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Diffusion-based reverse membrane bioreactor for simultaneous bioconversion of high-inhibitor xylose-glucose media2018Ingår i: Process Biochemistry, ISSN 1359-5113, E-ISSN 1873-3298, Vol. 72, s. 23-30Artikel i tidskrift (Refereegranskat)
  • 7.
    Mahboubi, Amir
    et al.
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Uwineza, C
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Doyen, W
    Mixed Matrix Material Innovations BVBA.
    De Wever, H
    Flemish Institute for Technological Research.
    Taherzadeh, Mohammad J
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Intensification of lignocellulosic bioethanol production process using continuous double-staged immersed membrane bioreactors2020Ingår i: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 296Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Processing complexities associated with different lignocellulosic bioethanol production stages have hindered reaching full commercial capacity. Therefore, in this study efforts were made to remediate some issues associated with hydrolysis and fermentation, by the integration of immersed membrane bioreactors (iMBRs) into lignocellulosic bioethanol production process. In this regards, double-staged continuous saccharification-filtration and co-fermentation-filtration of wheat straw slurry was conducted using iMBRs at filtration fluxes up to 51.0 l.m-2.h-1 (LMH). The results showed a stable long-term (264 h) continuous hydrolysis-filtration and fermentation-filtration with effective separation of lignin-rich solids (up to 70% lignin) from hydrolyzed sugars, and separation of yeast cells from bioethanol stream at an exceptional filtration performance at 21.9 LMH. Moreover, the effect of factors such as filtration flux, medium quality and backwashing on fouling and cake-layer formation was studied. The results confirmed the process intensification potentials of iMBRs in tackling commonly faced technical obstacles in lignocellulosic bioethanol production.

  • 8.
    Mahboubi, Amir
    et al.
    Högskolan i Borås, Akademin för textil, teknik och ekonomi. Biotechnology.
    Ylitervo, Paeivi
    Doyen, Wim
    De Wever, Heleen
    Molenberghs, Bart
    Taherzadeh, Mohammad J
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Continuous bioethanol fermentation from wheat straw hydrolysate with high suspended solid content using an immersed flat sheet membrane bioreactor.2017Ingår i: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 241, s. 296-308Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Finding a technol. approach that eases the prodn. of lignocellulosic bioethanol has long been considered as a great industrial challenge. In the current study a membrane bioreactor (MBR) set-up using integrated permeate channel (IPC) membrane panels was used to simultaneously ferment pentose and hexose sugars to ethanol in continuous fermn. of high suspended solid wheat straw hydrolyzate. The MBR was optimized to flawlessly operated at high SS concns. of up to 20% without any significant changes in the permeate flux and transmembrane pressure. By the help of the retained high cell concn., the yeast cells were capable of tolerating and detoxifying the inhibitory medium and succeeded to co-consume all glucose and up to 83% of xylose in a continuous fermn. mode leading to up to 83% of the theor. ethanol yield. [on SciFinder(R)]

  • 9.
    Thunuguntla, Rahul
    et al.
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Mahboubi, Amir
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Ferreira, Jorge
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Taherzadeh, Mohammad J
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Integration of Membrane Bioreactors with Edible Filamentous Fungi for Valorization of Expired Milk2018Övrigt (Övrigt vetenskapligt)
    Abstract [en]

    Around 29 million tons of milk end as waste yearly in Europe, representing an environmental issue but also a potential substrate for biological valorization given its nutritional value. Aspergillus oryzae and Neurospora intermedia are edible filamentous fungi with dissimilar metabolism when grown in expired milk. Neurospora intermedia is more devoted to lactose consumption; 68 and 57% of lactose was consumed after cultivation in expired milk and its liquid fraction, respectively. Aspergillus oryzae consumed less lactose in expired milk (14%), but led to better microfiltration characteristics of the final effluent due to fat and protein degradation. A two-stage fed-batch cultivation using membrane bioreactors (MBRs) was developed, bringing together both fungal metabolic characteristics when grown in 70% diluted expired milk. In the first MBR, A.oryzae degraded fat and protein, improved microfiltration, and produced ca 11 g/L of biomass. In the second MBR, N. intermedia consumed the remaining lactose in the permeate and originated ca 7 g/L of biomass. The developed system was successful for valorization of non-sterile milk due to the balance between consumption of bacterial growth-derived acids, consequent pH, and fungal enzymatic activities. Besides, a final clear effluent (83% reduction of COD) was obtained, which is of interest considering wastewater treatment.

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  • 10.
    Wainaina, Steven
    et al.
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Mohsen, Parchami
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Mahboubi, Amir
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Sárvári Horváth, Ilona
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Taherzadeh, Mohammad J
    Högskolan i Borås, Akademin för textil, teknik och ekonomi.
    Food waste-derived volatile fatty acids platform using an immersed membrane bioreactor2018Ingår i: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, artikel-id S0960-8524(18)31650-XArtikel i tidskrift (Refereegranskat)
    Abstract [en]

    Volatile fatty acids (VFAs) are the key intermediates from anaerobic digestion (AD) process that can be a platform to synthesize products of higher value than biogas. However, some obstacles still exist that prevent large-scale production and application of VFAs, key among them being the difficulty in recovering the acids from the fermentation medium and low product yields. In this study, a novel anaerobic immersed membrane bioreactor (iMBR) with robust cleaning capabilities, which incorporated frequent backwashing to withstand the complex AD medium, was designed and applied for production and in situ recovery of VFAs. The iMBR was fed with food waste and operated without pH control, achieving a high yield of 0.54 g VFA/g VSadded. The continuous VFA recovery process was investigated for 40 days at OLRs of 2 gVS/L/d and 4 gVS/L/d without significant change in the permeate flux at a maximum suspended solids concentration of 31 g/L.

    Publikationen är tillgänglig i fulltext från 2020-12-01 13:14
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