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Taherzadeh, Mohammad JORCID iD iconorcid.org/0000-0003-4887-2433
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Publications (10 of 376) Show all publications
Gurram, R., Souza Filho, P., Taherzadeh, M. J. & Zamani, A. (2018). A solvent-free approach for production of films from pectin and fungal biomass. Journal of polymers and the environment, 26(11), 4282-4292
Open this publication in new window or tab >>A solvent-free approach for production of films from pectin and fungal biomass
2018 (English)In: Journal of polymers and the environment, ISSN 1064-7546, E-ISSN 1572-8900, Vol. 26, no 11, p. 4282-4292Article in journal (Refereed) Published
Abstract [en]

Self-binding ability of the pectin molecules was used to produce pectin films using the compression molding technique, as an alternative method to the high energy-demanding and solvent-using casting technique. Moreover, incorporation of fungal biomass and its effects on the properties of the films was studied. Pectin powder plasticized with 30% glycerol was subjected to heat compression molding (120 °C, 1.33 MPa, 10 min) yielding pectin films with tensile strength and elongation at break of 15.7 MPa and 5.5%, respectively. The filamentous fungus Rhizopus oryzae was cultivated using the water-soluble nutrients obtained from citrus waste and yielded a biomass containing 31% proteins and 20% lipids. Comparatively, the same strain was cultivated in a semi-synthetic medium resulting in a biomass with higher protein (60%) and lower lipid content (10%). SEM images showed addition of biomass yielded films with less debris compared to the pectin films. Incorporation of the low protein content biomass up to 15% did not significantly reduce the mechanical strength of the pectin films. In contrast, addition of protein-rich biomass (up to 20%) enhanced the tensile strength of the films (16.1–19.3 MPa). Lastly, the fungal biomass reduced the water vapor permeability of the pectin films.

Keywords
Citrus waste, Pectin, Compression molding, Rhizopus oryzae, Bioplastics
National Category
Industrial Biotechnology
Research subject
Resource Recovery
Identifiers
urn:nbn:se:hb:diva-15055 (URN)10.1007/s10924-018-1300-x (DOI)000446743000011 ()2-s2.0-85052708199 (Scopus ID)
Available from: 2018-08-30 Created: 2018-08-30 Last updated: 2018-11-30Bibliographically approved
Bátori, V., Åkesson, D., Zamani, A., Taherzadeh, M. J. & Sárvári Horváth, I. (2018). Anaerobic degradation of bioplastics: A review. Waste Management, 80, 406-413
Open this publication in new window or tab >>Anaerobic degradation of bioplastics: A review
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2018 (English)In: Waste Management, Vol. 80, p. 406-413Article in journal (Refereed) Published
Abstract [en]

Anaerobic digestion (AD) of the organic fraction of municipal solid waste (OFMSW), leading to renewableenergy production in the form of methane, is a preferable method for dealing with the increasing amountof waste. Food waste is separated at the source in many countries for anaerobic digestion. However, thepresence of plastic bags is a major challenge for such processes. This study investigated the anaerobicdegradability of different bioplastics, aiming at potential use as collecting bags for the OFMSW. Thechemical composition of the bioplastics and the microbial community structure in the AD processaffected the biodegradation of the bioplastics. Some biopolymers can be degraded at hydraulic retentiontimes usually applied at the biogas plants, such as poly(hydroxyalkanoate)s, starch, cellulose and pectin,so no possible contamination would occur. In the future, updated standardization of collecting bags forthe OFMSW will be required to meet the requirements of effective operation of a biogas plant.

Keywords
Anaerobic digestion, Biodegradation, Bioplastics, Food waste, Methane, Plastic bags
National Category
Environmental Biotechnology
Identifiers
urn:nbn:se:hb:diva-15152 (URN)10.1016/j.wasman.2018.09.040 (DOI)2-s2.0-85054156950 (Scopus ID)
Available from: 2018-10-04 Created: 2018-10-04 Last updated: 2018-10-17Bibliographically approved
Millati, R., Lukitawesa, L., Permanasari, E. D., Sari, K. W., Cahyanto, M. N., Niklasson, C. & Taherzadeh, M. J. (2018). Anaerobic digestion of citrus waste using two-stage membrane bioreactor. In: IOP Conference Series: Materials Science and Engineering: . Paper presented at Quality in Research: International Symposium on Materials, Metallurgy, and Chemical Engineering, Bali, July 24–27, 2017.. , 316, Article ID 012063.
Open this publication in new window or tab >>Anaerobic digestion of citrus waste using two-stage membrane bioreactor
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2018 (English)In: IOP Conference Series: Materials Science and Engineering, 2018, Vol. 316, article id 012063Conference paper, Published paper (Refereed)
Abstract [en]

Anaerobic digestion is a promising method to treat citrus waste. However, the presence of limonene in citrus waste inhibits anaerobic digestion process. Limonene is an antimicrobial compound and could inhibit methane forming bacteria that takes a longer time to recover than the injured acid forming bacteria. Hence, volatile fatty acids will be accumulated and methane production will be decreased. One way to solve this problem is by conducting anaerobic digestion process into two stages. The first step is aimed for hydrolysis, acidogenesis, and acetogenesis reactions and the second stage is aimed for methanogenesis reaction. The separation of the system would further allow each stage in their optimum conditions making the process more stable. In this research, anaerobic digestion was carried out in batch operations using 120 ml-glass bottle bioreactors in 2 stages. The first stage was performed in free-cells bioreactor, whereas the second stage was performed in both bioreactor of free cells and membrane bioreactor. In the first stage, the reactor was set into 'anaerobic' and 'semi-aerobic' conditions to examine the effect of oxygen on facultative anaerobic bacteria in acid production. In the second stage, the protection of membrane towards the cells against limonene was tested. For the first stage, the basal medium was prepared with 1.5 g VS of inoculum and 4.5 g VS of citrus waste. The digestion process was carried out at 55°C for four days. For the second stage, the membrane bioreactor was prepared with 3 g of cells that were encased and sealed in a 3×6 cm2polyvinylidene fluoride membrane. The medium contained 40 ml basal medium and 10 ml liquid from the first stage. The bioreactors were incubated at 55°C for 2 days under anaerobic condition. The results from the first stage showed that the maximum total sugar under 'anaerobic' and 'semi-aerobic' conditions was 294.3 g/l and 244.7 g/l, respectively. The corresponding values for total volatile fatty acids were 3.8 g/l and 2.9 g/l, respectively. Methane production of citrus waste taken from the first stage under 'anaerobic' condition in membrane and free-cells bioreactors was 11.2 Nml and 7.2 Nml, respectively. Whereas, methane production of citrus waste taken from the first stage under 'semi-aerobic' condition in membrane and free-cells bioreactors was 8.8 Nml and 5.7 Nml, respectively. It can be seen from the results of the first stage that volatile fatty acids from 'anaerobic' condition was higher than that of 'semi-aerobic' condition. The absence of oxygen provides the optimal condition for growth and metabolism of facultative and obligatorily anaerobic bacteria in the first stage. Furthermore, polyvinylidene fluoride membrane was able to protect the cells from antimicrobial compounds.

National Category
Industrial Biotechnology
Research subject
Resource Recovery
Identifiers
urn:nbn:se:hb:diva-14027 (URN)10.1088/1757-899X/316/1/012063 (DOI)2-s2.0-85045624058 (Scopus ID)
Conference
Quality in Research: International Symposium on Materials, Metallurgy, and Chemical Engineering, Bali, July 24–27, 2017.
Available from: 2018-05-03 Created: 2018-05-03 Last updated: 2018-05-03Bibliographically approved
Chandolias, K., Richards, T. & Taherzadeh, M. J. (2018). Combined gasification-fermentation process in waste biorefinery. In: Waste Biorefinery: Potential and Perspectives. Elsevier
Open this publication in new window or tab >>Combined gasification-fermentation process in waste biorefinery
2018 (English)In: Waste Biorefinery: Potential and Perspectives, Elsevier, 2018Chapter in book (Refereed)
Abstract [en]

Thermal processes of wastes lead to production of energy in form of electricity and/or heat. However, if the goal is to produce materials, thermochemical processes can be applied. These processes via e.g. gasification produce raw syngas that is a mixture of principally H2, CO and CO2, with some impurities. This raw syngas is traditionally cleaned and catalytically treated via chemical processes such as Fischer-Tropsch. However, as there is a variety of microorganisms that can assimilate syngas, this gas can be used as a substrate to produce different chemicals via biochemical routes. This chapter is dedicated to describe an efficient thermochemical-biochemical route of waste treatment. The gasification process, the design and the factors that affect the syngas composition are firstly described. Thereafter, the microbiology, biochemical reactions, metabolic pathways and process conditions toward production of several metabolic products from syngas such as carboxylic acids, ethanol, butanol, 2,3-butanediol, methane and biopolymers are presented. 

Place, publisher, year, edition, pages
Elsevier, 2018
Keywords
Gasification, Fermentation, Biofuels, Valuable chemicals
National Category
Engineering and Technology
Identifiers
urn:nbn:se:hb:diva-14190 (URN)9780444639929 (ISBN)
Funder
Swedish Research Council
Available from: 2018-05-16 Created: 2018-05-16 Last updated: 2018-06-21Bibliographically approved
Mahboubi, A., Lundin, M., Doyen, W., De Wever, H. & Taherzadeh, M. J. (2018). Diffusion-based reverse membrane bioreactor for simultaneous bioconversion of high-inhibitor xylose-glucose media. Process Biochemistry, 72, 23-30
Open this publication in new window or tab >>Diffusion-based reverse membrane bioreactor for simultaneous bioconversion of high-inhibitor xylose-glucose media
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2018 (English)In: Process Biochemistry, ISSN 1359-5113, E-ISSN 1873-3298, Vol. 72, p. 23-30Article in journal (Refereed) Published
Keywords
Reverse membrane bioreactor, Concentration gradient, Diffusion rate, Fermentation, Inhibitor detoxification
National Category
Industrial Biotechnology
Identifiers
urn:nbn:se:hb:diva-15219 (URN)10.1016/j.procbio.2018.06.007 (DOI)000442710600003 ()2-s2.0-85048947972 (Scopus ID)
Available from: 2018-10-31 Created: 2018-10-31 Last updated: 2018-11-21Bibliographically approved
Nair, R. B., Gmoser, R., Lennartsson, P. R. & Taherzadeh, M. J. (2018). Does the second messenger cAMP have a more complex role in controlling filamentous fungal morphology and metabolite production?. MicrobiologyOpen
Open this publication in new window or tab >>Does the second messenger cAMP have a more complex role in controlling filamentous fungal morphology and metabolite production?
2018 (English)In: MicrobiologyOpen, ISSN 2045-8827, E-ISSN 2045-8827Article in journal (Refereed) Published
Place, publisher, year, edition, pages
Blackwell Publishing Ltd, 2018
National Category
Industrial Biotechnology
Identifiers
urn:nbn:se:hb:diva-14831 (URN)10.1002/mbo3.627 (DOI)000440928500015 ()2-s2.0-85045101454 (Scopus ID)20458827 (ISSN) (ISBN)
Available from: 2018-08-02 Created: 2018-08-02 Last updated: 2018-11-29
Souza Filho, P. F., Zamani, A. & Taherzadeh, M. J. (2018). Edible Protein Production by Filamentous Fungi using Starch Plant Wastewater. Waste and Biomass Valorization, 1-10
Open this publication in new window or tab >>Edible Protein Production by Filamentous Fungi using Starch Plant Wastewater
2018 (English)In: Waste and Biomass Valorization, ISSN 1877-2641, p. 1-10Article in journal (Refereed) 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.

Place, publisher, year, edition, pages
Springer Netherlands, 2018
Keywords
Bioethanol, Filamentous fungi, Fungal biomass, Wastewater treatment
National Category
Other Industrial Biotechnology
Identifiers
urn:nbn:se:hb:diva-14846 (URN)10.1007/s12649-018-0265-2 (DOI)2-s2.0-85042924369 (Scopus ID)18772641 (ISSN) (ISBN)
Available from: 2018-08-01 Created: 2018-08-01 Last updated: 2018-08-30
Osadolor, O. A. (2018). Effect of media rheology and bioreactor hydrodynamics on filamentous fungi fermentation of lignocellulosic and starch-based substrates under pseudoplastic flow conditions. Bioresource Technology, 263, 250-257
Open this publication in new window or tab >>Effect of media rheology and bioreactor hydrodynamics on filamentous fungi fermentation of lignocellulosic and starch-based substrates under pseudoplastic flow conditions
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2018 (English)In: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, Vol. 263, p. 250-257Article in journal (Refereed) Published
Abstract [en]

The aim of this work was to study how media rheology and bioreactor hydrodynamics would influence fermentation of lignocellulosic and starch-based substrates under pseudoplastic flow conditions. This was investigated using hydrolyzed wheat straw, wheat-based thin stillage and filamentous fungi as inoculum in bubble column, airlift and horizontal hybrid tubular/bubble column (textile bioreactor) bioreactors. The rheological models showed that the consistency index was dependent on biomass growth (R2 0.99) while the flow behavior index depended on biomass growth and suspended solid (R2 0.99). Oxygen transfer rate above 0.356 mmol-O2/L/h was needed for growing fungi with a cube-root growth rate constant of 0.03 g1/3/L1/3/h. At 1.4 VVM aeration the textile bioreactor performed better than others with minimal foaming, yields of 0.22 ± 0.01 g/g and 0.47 ± 0.01 g/g for ethanol and biomass, substrate consumption rate of 0.38 g/L/h. Operating the bioreactors with air-flowrate to cross-sectional area ratio of 8.75 × 10−3 (m3/s/m2) or more led to sustained foaming.

Keywords
Foaming Oxygen transfer rate, Rheology model, Fungi growth kinetics, Bioreactor hydrodynamics
National Category
Chemical Process Engineering
Research subject
Resource Recovery
Identifiers
urn:nbn:se:hb:diva-14345 (URN)10.1016/j.biortech.2018.04.093 (DOI)000439317100030 ()2-s2.0-85046700875 (Scopus ID)
Available from: 2018-06-21 Created: 2018-06-21 Last updated: 2018-11-29Bibliographically approved
Chandolias, K., Wainaina, S., Niklasson, C. & Taherzadeh, M. J. (2018). Effects of Heavy Metals and pH on the Conversion of Biomass to Hydrogen via Syngas Fermentation. BioResources
Open this publication in new window or tab >>Effects of Heavy Metals and pH on the Conversion of Biomass to Hydrogen via Syngas Fermentation
2018 (English)In: BioResources, ISSN 1930-2126, E-ISSN 1930-2126Article in journal (Refereed) Published
Abstract [en]

The effects of three heavy metals on hydrogen production via syngas fermentation were investigated within a metal concentration range of 0-1.5 mg Cu/L, 0-9 mg Zn/L, 0-42 mg Mn/L, in media with initial pH of 5, 6 and 7, at 55 °C. The results showed that at lower metal concentration, pH 6 was optimum while at higher metal concentrations, pH 5 stimulated the process. More specifically, the highest hydrogen production activity recorded was 155.28% ± 12.02% at a metal concentration of 0.04 mg Cu/L, 0.25 mg Zn/L, and 1.06 mg Mn/L and an initial medium pH of 6. At higher metal concentration (0.625 mg Cu/L, 3.75 mg Zn/L, and 17.5 mg Mn/L), only pH 5 was stimulating for the cells. The results show that the addition of heavy metals, contained in gasification-derived ash, can improve the production rate and yield of fermentative hydrogen. This could lead in lower costs in gasification process and fermentative hydrogen production and less demand for syngas cleaning before syngas fermentation.

Keywords
Gasification; Syngas; Fermentative hydrogen; Heavy metals; pH
National Category
Industrial Biotechnology
Research subject
Resource Recovery
Identifiers
urn:nbn:se:hb:diva-14189 (URN)
Funder
Swedish Research Council
Available from: 2018-05-16 Created: 2018-05-16 Last updated: 2018-05-18Bibliographically approved
Mahmoodi, P., Karimi, K. & Taherzadeh, M. J. (2018). Efficient conversion of municipal solid waste to biofuel by simultaneous dilute-acid hydrolysis of starch and pretreatment of lignocelluloses. Energy Conversion and Management, 166, 569-578
Open this publication in new window or tab >>Efficient conversion of municipal solid waste to biofuel by simultaneous dilute-acid hydrolysis of starch and pretreatment of lignocelluloses
2018 (English)In: Energy Conversion and Management, ISSN 0196-8904, E-ISSN 1879-2227, Vol. 166, p. 569-578Article in journal (Refereed) Published
Abstract [en]

The organic fraction of municipal solid waste (OFMSW) is a complex mixture of easily digestible compounds, mainly starchy materials, and hardly digestible compounds, mainly lignocelluloses. Thus, OFMSW has a high potential for biofuel production after the hydrolysis of carbohydrates. In this study, dilute-acid treatment was used for the hydrolysis of starchy materials, eliminating the amylases enzymes requirement. Besides, the acid treatment acted as a pretreatment for the improvement of lignocelluloses fractions prior to the enzymatic hydrolysis of lignocelluloses. The acid treatment was conducted with 0.5 and 1% (w/w) sulfuric acid at 130 and 160 °C for 0, 30, and 60 min. The treatment with 1% acid at 130 °C for 60 min resulted in the hydrolysate with the highest glucose concentration of 43.2 g/L, mainly originated from starchy materials, and the subsequent enzymatic hydrolysis of the treated solids resulted in a hydrolysate containing 23.4 g/L glucose, mainly from cellulose. These hydrolysates, containing different sugars and inhibitors, were then subjected to ethanolic fermentation using a highly inhibitor-tolerant strain of Zygomycetes fungi, Mucor indicus. Using acid treatment with 1% at 130 °C for 60 min, without detoxification, the ethanol yield of 44.6 and 44.4 g per 100 g glucose was obtained from hydrolysate and acid treatment liquor, respectively. The liquid remained after the separation of ethanol from fermentation liquor and the residual solid remained after enzymatic hydrolysis were subjected to anaerobic digestion for biogas production. Overall, 194.0 g ethanol and 144.8 L methane were produced from each kg of dry OFMSW through the consecutive processes. Therefore, without detoxification and amylases requirement, all biodegradable parts of MSW were converted to bioenergy in the form of ethanol and biogas, resulting in the production of 10,453 kJ energy and 326.6 mL gasoline equivalent from each kg of dry OFMSW. © 2018 Elsevier Ltd

Place, publisher, year, edition, pages
Elsevier Ltd, 2018
Keywords
Bioethanol, Biogas, Dilute-acid treatment, Enzymatic hydrolysis, Municipal solid waste
National Category
Industrial Biotechnology
Research subject
Resource Recovery
Identifiers
urn:nbn:se:hb:diva-14826 (URN)10.1016/j.enconman.2018.04.067 (DOI)000434004200048 ()2-s2.0-85046355959 (Scopus ID)01968904 (ISSN) (ISBN)
Available from: 2018-08-02 Created: 2018-08-02 Last updated: 2018-08-08Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0003-4887-2433

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