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Svensson, Bo H
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Publications (10 of 123) Show all publications
Safaric, L., Björn (Fredriksson), A., Svensson, B. H., Bastviken, D. & Shakeri Yekta, S. (2023). Rheology, Micronutrients, and Process Disturbance in Continuous Stirred-Tank Biogas Reactors. Industrial & Engineering Chemistry Research, 62(43), 17372-17384
Open this publication in new window or tab >>Rheology, Micronutrients, and Process Disturbance in Continuous Stirred-Tank Biogas Reactors
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2023 (English)In: Industrial & Engineering Chemistry Research, ISSN 0888-5885, E-ISSN 1520-5045, Vol. 62, no 43, p. 17372-17384Article, review/survey (Refereed) Published
Abstract [en]

Anaerobic digestion (AD) is an important technology for achieving sustainability, but it faces challenges in meeting rising production demands while remaining economically profitable. One difficulty is the lack of a comprehensive understanding of the many interactions within anaerobic digesters, which makes it challenging to fully optimize them. This is particularly notable when considering the interlinked dynamics between micronutrient availability and fluid behavior. This study addresses this gap by focusing on key operational parameters affecting the efficiency of the process in continuous stirred-tank biogas reactors, which are the most used AD technology today. It does so by proposing and evaluating a novel conceptual model of the mechanisms behind how different parts of AD processes interact upon disturbance, highlighting strategies for preventing process failure. This article aims to improve our understanding of the complexity of AD biotechnology and to provide a starting point for developing advanced strategies for operational optimization.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC, 2023
National Category
Chemical Engineering
Identifiers
urn:nbn:se:liu:diva-199339 (URN)10.1021/acs.iecr.3c00854 (DOI)001094453900001 ()
Note

Funding Agencies|Swedish Research Council Formas (Svenska Forskningsradet Formas) [2016- 01054]; Biogas Solutions Research Center, hosted by Linkoping University, Sweden; Swedish Energy Agency (Energimyndigheten) [P2021-90266]

Available from: 2023-11-28 Created: 2023-11-28 Last updated: 2025-02-18Bibliographically approved
Shakeri Yekta, S., Svensson, B. H., Skyllberg, U. & Schnürer, A. (2023). Sulfide in engineered methanogenic systems - Friend or foe?. Biotechnology Advances, 69, Article ID 108249.
Open this publication in new window or tab >>Sulfide in engineered methanogenic systems - Friend or foe?
2023 (English)In: Biotechnology Advances, ISSN 0734-9750, E-ISSN 1873-1899, Vol. 69, article id 108249Article, review/survey (Refereed) Published
Abstract [en]

Sulfide ions are regarded to be toxic to microorganisms in engineered methanogenic systems (EMS), where organic substances are anaerobically converted to products such as methane, hydrogen, alcohols, and carboxylic acids. A vast body of research has addressed solutions to mitigate process disturbances associated with high sulfide levels, yet the established paradigm has drawn the attention away from the multifaceted sulfide interactions with minerals, organics, microbial interfaces and their implications for performance of EMS. This brief review brings forward sulfide-derived pathways other than toxicity and with potential significance for anaerobic organic matter degradation. Available evidence on sulfide reactions with organic matter, interventions with key microbial metabolisms, and interspecies electron transfer are critically synthesized as a guidance for comprehending the sulfide effects on EMS apart from the microbial toxicity. The outcomes identify existing knowledge gaps and specify future research needs as a step forward towards realizing the potential of sulfide-derived mechanisms in diversifying and optimizing EMS applications.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD, 2023
Keywords
Anaerobic biotechnologies; Sulfurization; Thiols; Micronutrients uptake; Interspecies electron transfer; Organic pollutants; Antibiotic resistant genes; Iron sulfide
National Category
Biochemistry Molecular Biology
Identifiers
urn:nbn:se:liu:diva-198807 (URN)10.1016/j.biotechadv.2023.108249 (DOI)001080034700001 ()37666371 (PubMedID)
Note

Funding Agencies|Swedish Energy Agency through the Biogas Solutions Research Center (BSRC) in Linkoping [P2021-90266]

Available from: 2023-10-30 Created: 2023-10-30 Last updated: 2025-02-20
Robroek, B. J. M., Marti, M., Svensson, B. H., Dumont, M. G., Veraart, A. J. & Jassey, V. E. J. (2021). Rewiring of peatland plant–microbe networks outpaces species turnover. Oikos, 130(3), 339-353
Open this publication in new window or tab >>Rewiring of peatland plant–microbe networks outpaces species turnover
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2021 (English)In: Oikos, ISSN 0030-1299, E-ISSN 1600-0706, Vol. 130, no 3, p. 339-353Article in journal (Refereed) Published
Abstract [en]

Enviro‐climatic changes are thought to be causing alterations in ecosystem processes through shifts in plant and microbial communities; however, how links between plant and microbial communities change with enviro–climatic change is likely to be less straightforward but may be fundamental for many ecological processes. To address this, we assessed the composition of the plant community and the prokaryotic community – using amplicon‐based sequencing – of three European peatlands that were distinct in enviro–climatic conditions. Bipartite networks were used to construct site‐specific plant–prokaryote co‐occurrence networks. Our data show that between sites, plant and prokaryotic communities differ and that turnover in interactions between the communities was complex. Essentially, turnover in plant–microbial interactions is much faster than turnover in the respective communities. Our findings suggest that network rewiring does largely result from novel or different interactions between species common to all realised networks. Hence, turnover in network composition is largely driven by the establishment of new interactions between a core community of plants and microorganisms that are shared among all sites. Taken together our results indicate that plant–microbe associations are context dependent, and that changes in enviro–climatic conditions will likely lead to network rewiring. Integrating turnover in plant–microbe interactions into studies that assess the impact of enviro–climatic change on peatland ecosystems is essential to understand ecosystem dynamics and must be combined with studies on the impact of these changes on ecosystem processes.

Place, publisher, year, edition, pages
Wiley-Blackwell Publishing Inc., 2021
Keywords
16S amplicon sequencing, 16S rRNA, bipartite networks, microbial and plant diversity, peatlands, plant–microbe interactions
National Category
Ecology
Identifiers
urn:nbn:se:liu:diva-173027 (URN)10.1111/oik.07635 (DOI)000608571500001 ()2-s2.0-85099484361 (Scopus ID)
Available from: 2021-01-27 Created: 2021-01-27 Last updated: 2022-03-08Bibliographically approved
Safaric, L., Shakeri Yekta, S., Svensson, B. H., Schnürer, A., Bastviken, D. & Björn (Fredriksson), A. (2020). Effect of Cobalt, Nickel, and Selenium/Tungsten Deficiency on Mesophilic Anaerobic Digestion of Chemically Defined Soluble Organic Compounds. Microorganisms, 8(4), Article ID 598.
Open this publication in new window or tab >>Effect of Cobalt, Nickel, and Selenium/Tungsten Deficiency on Mesophilic Anaerobic Digestion of Chemically Defined Soluble Organic Compounds
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2020 (English)In: Microorganisms, E-ISSN 2076-2607, Vol. 8, no 4, article id 598Article in journal (Refereed) Published
Abstract [en]

Trace elements (TEs) are vital for anaerobic digestion (AD), due to their role as cofactors in many key enzymes. The aim of this study was to evaluate the effects of specific TE deficiencies on mixed microbial communities during AD of soluble polymer-free substrates, thus focusing on AD after hydrolysis. Three mesophilic (37 degrees C) continuous stirred-tank biogas reactors were depleted either of Co, Ni, or a combination of Se and W, respectively, by discontinuing their supplementation. Ni and Se/W depletion led to changes in methane kinetics, linked to progressive volatile fatty acid (VFA) accumulation, eventually resulting in process failure. No significant changes occurred in the Co-depleted reactor, indicating that the amount of Co present in the substrate in absence of supplementation was sufficient to maintain process stability. Archaeal communities remained fairly stable independent of TE concentrations, while bacterial communities gradually changed with VFA accumulation in Ni- and Se-/W-depleted reactors. Despite this, the communities remained relatively similar between these two reactors, suggesting that the major shifts in composition likely occurred due to the accumulating VFAs. Overall, the results indicate that Ni and Se/W depletion primarily lead to slower metabolic activities of methanogenic archaea and their syntrophic partners, which then has a ripple effect throughout the microbial community due to a gradual accumulation of intermediate fermentation products.

Place, publisher, year, edition, pages
MDPI, 2020
Keywords
artificial substrate; biogas; trace elements; micronutrients; volatile fatty acids; kinetics
National Category
Microbiology
Identifiers
urn:nbn:se:liu:diva-166118 (URN)10.3390/microorganisms8040598 (DOI)000533510400125 ()32326100 (PubMedID)2-s2.0-85084003099 (Scopus ID)
Note

Funding Agencies|European Unions Seventh Framework Programme for research, technological development and demonstrationEuropean Union (EU) [316838]; Swedish Research Council Formas (Svenska Forskningsradet Formas)Swedish Research Council Formas [2016-01054]; Biogas Research Centre - Linkoping University; Swedish Energy Agency (Energimyndigheten)Swedish Energy Agency [35624-2]; Swedish Research CouncilSwedish Research Council; Knut and Alice Wallenberg FoundationKnut & Alice Wallenberg Foundation

Available from: 2020-06-08 Created: 2020-06-08 Last updated: 2023-12-28Bibliographically approved
Ekstrand, E.-M., Hedenström, M., Svensson, B. H., Shakeri Yekta, S. & Björn (Fredriksson), A. (2020). Methane potentials and organic matter characterization of wood fibres from pulp and paper mills: The influence of raw material, pulping process and bleaching technique. Biomass and Bioenergy, 143(105824)
Open this publication in new window or tab >>Methane potentials and organic matter characterization of wood fibres from pulp and paper mills: The influence of raw material, pulping process and bleaching technique
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2020 (English)In: Biomass and Bioenergy, ISSN 0961-9534, E-ISSN 1873-2909, Vol. 143, no 105824Article in journal (Refereed) Published
Abstract [en]

During the process of pulp- and papermaking, large volumes of fibre-rich primary sludge are generated. Anaerobic digestion of primary sludge offers a substantial potential for methane production as an alternative approach to the inefficient energy recoveries by commonly used incineration techniques. However, a systematic study of the importance of upstream process techniques for the methane potential of pulp fibres is lacking. Therefore, biochemical methane potentials were determined at mesophilic conditions for 20 types of fibres processed by a variety of pulping and bleaching techniques and from different raw materials. This included fibres from kraft, sulphite, semi-chemical, chemical thermo-mechanical (CTMP) and thermo-mechanical pulping plants and milled raw wood. The pulping technique was clearly important for the methane potential, with the highest potential achieved for kraft and sulphite fibres (390–400 Nml CH4 g VS− 1 ). For raw wood and CTMP, hardwood fibres gave substantially more methane than the corresponding softwood fibres (240 compared to 50 Nml CH4 g VS− 1 and 300 compared to 160 Nml CH4 g VS− 1 , respectively). Nuclear magnetic resonance characterization of the organic content demonstrated that the relative lignin content of the fibres was an important factor for methane production, and that an observed positive effect of bleaching on the methane potential of softwood CTMP fibres was likely related to a higher degree of deacetylation and improved accessibility of the hemicellulose. In conclusion, fibres from kraft and sulphite pulping are promising substrates for methane production irrespective of raw material or bleaching, as well as fibres from CTMP pulping of hardwood.

Place, publisher, year, edition, pages
Elsevier, 2020
Keywords
Fibers Softwood Hardwood Pulping Bleaching Anaerobic digestion
National Category
Environmental Sciences
Identifiers
urn:nbn:se:liu:diva-171510 (URN)10.1016/j.biombioe.2020.105824 (DOI)000596272500002 ()2-s2.0-85093951507 (Scopus ID)
Funder
Swedish Energy Agency, 32802-2Swedish Research Council Formas, 2016-01054Swedish Energy Agency, 35624-2
Note

Funding agencies: Knut and Alice Wallenberg foundationKnut & Alice Wallenberg Foundation; Swedish Energy AgencySwedish Energy Agency [32802-2]; Scandinavian Biogas Fuels AB; Poyry AB; BillerudKorsnas AB; SCA; Fiskeby Board AB; Purac AB; Swedish Research Council FormasSwedi

Available from: 2020-11-20 Created: 2020-11-20 Last updated: 2021-01-26Bibliographically approved
Safaric, L., Shakeri Yekta, S., Ejlertsson, J., Safari, M., Nadali Najafabadi, H., Karlsson, A., . . . Björn, A. (2019). A Comparative Study of Biogas Reactor Fluid Rheology: Implications for Mixing Profile and Power Demand. Processes, 7(10)
Open this publication in new window or tab >>A Comparative Study of Biogas Reactor Fluid Rheology: Implications for Mixing Profile and Power Demand
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2019 (English)In: Processes, ISSN 2227-9717, Processes, ISSN 2227-9717, Vol. 7, no 10Article in journal (Refereed) Published
Abstract [en]

Anaerobic digestion (AD) is an established process for integrating waste management with renewable energy and nutrient recovery. Much of the research in this field focuses on the utilisation of new substrates, yet their effects on operational aspects such as fluid behaviour and power requirement for mixing are commonly overlooked, despite their importance for process optimisation. This study analysed rheological characteristics of samples from 21 laboratory-scale continuous stirred-tank biogas reactors (CSTBRs) digesting a range of substrates, in order to evaluate substrate effect on mixing efficiency and power demand through computational fluid dynamics (CFD). The results show that substrate and process parameters, such as solids content and organic loading, all have a significant effect on CSTBR fluid rheology. The correlation levels between rheological and process parameters were different across substrates, while no specific fluid behaviour patterns could be associated with substrate choice. Substrate should thus be considered an equally important rheology effector as process parameters. Additional substrate-related parameters should be identified to explain the differences in correlations between rheological and process parameters across substrate groups. The CFD modelling revealed that the rheology differences among the AD processes have significant implications for mixing efficiency and power demand of the CSTBRs, highlighting the importance of considering the substrate-induced effects on CSTBR rheology before including a new substrate.

Place, publisher, year, edition, pages
Basel, Switzerland: MDPI, 2019
Keywords
anaerobic digestion; viscosity; substrate; computational fluid dynamics; stirring
National Category
Bioenergy
Identifiers
urn:nbn:se:liu:diva-161272 (URN)10.3390/pr7100700 (DOI)000495436200062 ()
Funder
EU, FP7, Seventh Framework Programme, 316838Swedish Research Council Formas, 2016-01054Vinnova, 2008-139
Note

Funding agencies:  European CommissionEuropean Commission Joint Research Centre [316838 ATBEST]; Swedish Research Council FormasSwedish Research CouncilSwedish Research Council Formas [2016-01054]; Swedish Innovation Agency [2008-139]

Available from: 2019-10-25 Created: 2019-10-25 Last updated: 2019-11-27Bibliographically approved
Ometto, F., Berg, A., Björn, A., Safaric, L., Svensson, B. H., Karlsson, A. & Ejlertsson, J. (2018). Inclusion of Saccharina latissima in conventional anaerobic digestion systems. Environmental technology, 39(5), 628-639
Open this publication in new window or tab >>Inclusion of Saccharina latissima in conventional anaerobic digestion systems
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2018 (English)In: Environmental technology, ISSN 0959-3330, E-ISSN 1479-487X, Vol. 39, no 5, p. 628-639Article in journal (Refereed) Published
Abstract [en]

Loading macroalgae into existing anaerobic digestion (AD) plants allows us to overcome challenges such as low digestion efficiencies, trace elements limitation, excessive salinity levels and accumulation of volatile fatty acids (VFAs), observed while digesting algae as a single substrate. In this work, the co-digestion of the brown macroalgae Saccharina latissima with mixed municipal wastewater sludge (WWS) was investigated in mesophilic and thermophilic conditions. The hydraulic retention time (HRT) and the organic loading rate (OLR) were fixed at 19 days and 2.1 g l-1 d-1of volatile solids (VS), respectively. Initially, WWS was digested alone. Subsequently, a percentage of the total OLR (20%, 50% and finally 80%) was replaced by S. latissima biomass. Optimal digestion conditions were observed at medium-low algae loading (=50% of total OLR) with an average methane yield close to [Formula: see text] and [Formula: see text] in mesophilic and thermophilic conditions, respectively. The conductivity values increased with the algae loading without inhibiting the digestion process. The viscosities of the reactor sludges revealed decreasing values with reduced WWS loading at both temperatures, enhancing mixing properties.

Place, publisher, year, edition, pages
Taylor & Francis, 2018
Keywords
Seaweed; biomethane; co-digestion; salinity; viscosity
National Category
Water Treatment
Identifiers
urn:nbn:se:liu:diva-146067 (URN)10.1080/09593330.2017.1309075 (DOI)000427166700008 ()28317451 (PubMedID)2-s2.0-85017127668 (Scopus ID)
Available from: 2018-03-27 Created: 2018-03-27 Last updated: 2025-02-10Bibliographically approved
Ziels, R. M., Svensson, B. H., Sundberg, C., Larsson, M., Karlsson, A. & Shakeri Yekta, S. (2018). Microbial rRNA gene expression and co-occurrence profiles associate with biokinetics and elemental composition in full-scale anaerobic digesters. Microbial Biotechnology, 11(4), 694-709
Open this publication in new window or tab >>Microbial rRNA gene expression and co-occurrence profiles associate with biokinetics and elemental composition in full-scale anaerobic digesters
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2018 (English)In: Microbial Biotechnology, ISSN 1751-7907, E-ISSN 1751-7915, Vol. 11, no 4, p. 694-709Article in journal (Refereed) Published
Abstract [en]

This study examined whether the abundance and expression of microbial 16S rRNA genes were associated with elemental concentrations and substrate conversion biokinetics in 20 full-scale anaerobic digesters, including seven municipal sewage sludge (SS) digesters and 13 industrial codigesters. SS digester contents had higher methane production rates from acetate, propionate and phenyl acetate compared to industrial codigesters. SS digesters and industrial codigesters were distinctly clustered based on their elemental concentrations, with higher concentrations of NH3-N, Cl, K and Na observed in codigesters. Amplicon sequencing of 16S rRNA genes and reverse-transcribed 16S rRNA revealed divergent grouping of microbial communities between mesophilic SS digesters, mesophilic codigesters and thermophilic digesters. Higher intradigester distances between Archaea 16S rRNA and rRNA gene profiles were observed in mesophilic codigesters, which also had the lowest acetate utilization biokinetics. Constrained ordination showed that microbial rRNA and rRNA gene profiles were significantly associated with maximum methane production rates from acetate, propionate, oleate and phenyl acetate, as well as concentrations of NH3-N, Fe, S, Mo and Ni. A co-occurrence network of rRNA gene expression confirmed the three main clusters of anaerobic digester communities based on active populations. Syntrophic and methanogenic taxa were highly represented within the subnetworks, indicating that obligate energy-sharing partnerships play critical roles in stabilizing the digester microbiome. Overall, these results provide new evidence showing that different feed substrates associate with different micronutrient compositions in anaerobic digesters, which in turn may influence microbial abundance, activity and function.

Place, publisher, year, edition, pages
Wiley-Blackwell Publishing Inc., 2018
National Category
Microbiology
Identifiers
urn:nbn:se:liu:diva-149709 (URN)10.1111/1751-7915.13264 (DOI)000435946800011 ()29633555 (PubMedID)2-s2.0-85045737255 (Scopus ID)
Note

Funding Agencies|Swedish Energy Agency; Biogas Research Centre at Linkoping University, Sweden; NSF [DGE-1256082]

Available from: 2018-07-24 Created: 2018-07-24 Last updated: 2022-10-03Bibliographically approved
Larsson, M., Truong, X.-b., Björn, A., Ejlertsson, J., Svensson, B., Bastviken, D. & Karlsson, A. (2017). Anaerobic digestion of wastewater from the production of bleached chemical thermo-mechanical pulp: higher methane production for hardwood than softwood. Journal of chemical technology and biotechnology (1986), 2(1), 140-151
Open this publication in new window or tab >>Anaerobic digestion of wastewater from the production of bleached chemical thermo-mechanical pulp: higher methane production for hardwood than softwood
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2017 (English)In: Journal of chemical technology and biotechnology (1986), ISSN 0268-2575, E-ISSN 1097-4660, Vol. 2, no 1, p. 140-151Article in journal (Refereed) Published
Abstract [en]

BACKGROUND: Chemical thermo-mechanical pulp (CTMP) mills holds a large biomethane potential in their wastewater. Their broadened market has involved increased bleaching and utilisation of different raw materials. Therefore, the main aim of this study was to obtain and maintain a stable anaerobic digestion (AD) process, with a high methane yield and total organic carbon (TOC) reduction, when digesting CTMP wastewater, from different production protocols including shifts in raw material and bleaching. A lab-scale upflow anaerobic sludge bed (UASB) reactor was used for the tests.

RESULTS: The variations in raw material (aspen, birch and spruce) and consequently in TOC-loading (3.6-6.6 kg TOC m-3 and day-1) did not affect the UASB process negatively. Methane production values from 360 to 500 NmL g TOC-1 were obtained, with the highest yield for wastewater from the production of birch- followed by aspenand spruce pulp. The acetic acid and fTOC reduction ranged 90 to 95% and 61 to 73%, respectively.

CONCLUSIONS: The stable process performance maintained during shifts in raw material for pulp production show that AD is feasible for CTMP mills with a diversified product portfolio. Furthermore, the increased use of hardwood and bleaching will most likely increase their potential as a biomethane producer.

Place, publisher, year, edition, pages
John Wiley & Sons, 2017
Keywords
biogas, wastewater treatment, UASB, CTMP, softwood, hardwood
National Category
Water Engineering
Identifiers
urn:nbn:se:liu:diva-122338 (URN)10.1002/jctb.4980 (DOI)000389443600017 ()
Funder
Swedish Energy Agency, 32802–1
Note

At the time for thesis presentation publication was in status: Manuscript

At the time for thesis presentation manuscript was named: Anaerobic digestion of wastewater from the production of bleached chemical thermo-mechanical pulp: The effect of changes in raw material composition

Funding agencies: Swedish Energy Agency [32802-1]; Scandinavian Biogas Fuels AB; Poyry Sweden AB; BillerudKorsnas AB; Purac AB; SCA

Available from: 2015-10-29 Created: 2015-10-29 Last updated: 2022-10-03Bibliographically approved
Shakeri Yekta, S., Skyllberg, U., Danielsson, Å., Björn, A. & Svensson, B. H. (2017). Chemical Speciation of Sulfur and Metals in Biogas Reactors - Implications for Cobalt and Nickel Bio-uptake Processes. Journal of Hazardous Materials, 324, 110-116
Open this publication in new window or tab >>Chemical Speciation of Sulfur and Metals in Biogas Reactors - Implications for Cobalt and Nickel Bio-uptake Processes
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2017 (English)In: Journal of Hazardous Materials, ISSN 0304-3894, Vol. 324, p. 110-116Article in journal (Refereed) Published
Abstract [en]

This article deals with the interrelationship between overall chemical speciation of S, Fe, Co, and Ni in relation to metals bio-uptake processes in continuous stirred tank biogas reactors (CSTBR). To address this topic, laboratory CSTBRs digesting sulfur(S)-rich stillage, as well as full-scale CSTBRs treating sewage sludge and various combinations of organic wastes, termed co-digestion, were targeted. Sulfur speciation was evaluated using acid volatile sulfide extraction and X-ray absorption spectroscopy. Metal speciation was evaluated by chemical fractionation, kinetic and thermodynamic analyses. Relative Fe to S content is identified as a critical factor for chemical speciation and bio-uptake of metals. In reactors treating sewage sludge, quantity of Fe exceeds that of S, inducing Fe-dominated conditions, while sulfide dominates in laboratory and co-digestion reactors due to an excess of S over Fe. Under sulfide-dominated conditions, metals availability for microorganisms is restricted due to formation of metal-sulfide precipitates. However, aqueous concentrations of different Co and Ni species were shown to be sufficient to support metal acquisition by microorganisms under sulfidic conditions. Concentrations of free metal ions and labile metal complexes in aqueous phase, which directly participate in bio-uptake processes, are higher under Fe-dominated conditions. This in turn enhances metal adsorption on cell surfaces and bio-uptake rates.

Keywords
Biogas, Chemical, speciation, Bio-uptake, Sulfur, Iron Cobalt, Nickela
National Category
Analytical Chemistry
Identifiers
urn:nbn:se:liu:diva-127149 (URN)10.1016/j.jhazmat.2015.12.058 (DOI)000390723900014 ()
Available from: 2016-04-15 Created: 2016-04-15 Last updated: 2017-01-26
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