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Rupar-Gadd, KatarinaORCID iD iconorcid.org/0000-0003-2961-296X
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Publications (10 of 20) Show all publications
Rupar-Gadd, K. & Forss, J. (2018). Self-heating properties of softwood samples investigated by using isothermal calorimetry. Biomass and Bioenergy, 111, 206-212
Open this publication in new window or tab >>Self-heating properties of softwood samples investigated by using isothermal calorimetry
2018 (English)In: Biomass and Bioenergy, ISSN 0961-9534, E-ISSN 1873-2909, Vol. 111, p. 206-212Article in journal (Refereed) Published
Abstract [en]

The investigation focused on obtaining experimental results from the self-heating properties of different softwood samples during lab-scale storage. The samples investigated were a mixture of dried soft wood sawdust, softwood pellets 8 mm in diameter, and aged softwood sawdust stored outdoors for three months. Isothermal calorimetry was used to measure the heat released from the biomass samples and assess the contribution to self-heating during storage. Softwood samples were stored at 20 °C, 50 °C, 55 °C and 60 °C, and the metals manganese, copper and iron were added as a water solution to investigate if the presence of metals would increase the risk of self-heating. For most sample series, the highest levels of heat release were found after approximately 10 days of storage; sample series stored at 50 °C displayed the highest levels. The addition of copper resulted in levels of heat release 135% higher than samples without metal added.

Place, publisher, year, edition, pages
Elsevier, 2018
Keywords
Softwood pellets, Sawdust, Storage, Self-heating, Isothermal calorimetry, Metals
National Category
Bioenergy
Research subject
Technology (byts ev till Engineering), Bioenergy Technology; Environmental Science, Environmental technology
Identifiers
urn:nbn:se:lnu:diva-64971 (URN)10.1016/j.biombioe.2017.04.008 (DOI)000426994100024 ()2-s2.0-85019540518 (Scopus ID)
Available from: 2017-06-08 Created: 2017-06-08 Last updated: 2019-08-29Bibliographically approved
Rupar-Gadd, K. (2016). Parametric Study of Self-heating properties in Woody Biomass Samples. In: EUBCE 2016 – 24th European Biomass Conference & Exhibition: 6th Jun, 2016 - 9th Jun, 2016, Amsterdam, The Netherlands. Paper presented at EUBCE 2016 – 24th European Biomass Conference & Exhibition, 6th Jun, 2016 - 9th Jun, 2016, Amsterdam, The Netherlands (pp. 578-579). ETA-Florence Renewable Energy
Open this publication in new window or tab >>Parametric Study of Self-heating properties in Woody Biomass Samples
2016 (English)In: EUBCE 2016 – 24th European Biomass Conference & Exhibition: 6th Jun, 2016 - 9th Jun, 2016, Amsterdam, The Netherlands, ETA-Florence Renewable Energy , 2016, p. 578-579Conference paper, Published paper (Refereed)
Abstract [en]

The current investigation focused on obtaining experimental results on self-heating properties of different woody biomasses during lab-scale storage. The heat released from the different biomass samples was measured by isothermal calorimetry, with the purpose to assess the contribution to self-heating during storage. Biomass samples were stored at different temperatures and metals were added in order to investigate if the presence of metals would increase the risk of self-heating. There was an increase in heat release after 10-30 days of storage, and the addition of metals gave rise to an increase in heat release. The results are intended to be useful when planning for the large-scale use of different biomasses, leading to the need of storage.

Place, publisher, year, edition, pages
ETA-Florence Renewable Energy, 2016
Keywords
biomass, wood pellet, storage
National Category
Bioenergy
Identifiers
urn:nbn:se:lnu:diva-62176 (URN)10.5071/24thEUBCE2016-2CO.13.2 (DOI)9788889407165 (ISBN)
Conference
EUBCE 2016 – 24th European Biomass Conference & Exhibition, 6th Jun, 2016 - 9th Jun, 2016, Amsterdam, The Netherlands
Available from: 2017-04-10 Created: 2017-04-10 Last updated: 2017-04-11Bibliographically approved
Jansson, A., Rupar-Gadd, K., Forss, J. & Welander, U. (2016). Pilot-Scale Experiments Using Cultivated Macro Algae for Biogas Production, Part of a Future Seafarm Biorefinery. In: 24th EUBCE Online Proceedings 2016: Setting the course for a biobased economy. Held in Amsterdam, The Netherlands, 6 - 9 June 2016. Paper presented at 24th European Biomass Conference : Setting the course for a biobased economy. Held in Amsterdam, The Netherlands, 6 - 9 June 2016 (pp. 627-629). ETA-Florence Renewable Energies
Open this publication in new window or tab >>Pilot-Scale Experiments Using Cultivated Macro Algae for Biogas Production, Part of a Future Seafarm Biorefinery
2016 (English)In: 24th EUBCE Online Proceedings 2016: Setting the course for a biobased economy. Held in Amsterdam, The Netherlands, 6 - 9 June 2016, ETA-Florence Renewable Energies , 2016, p. 627-629Conference paper, Published paper (Refereed)
Abstract [en]

The research is focused on evaluation of substrates not commonly used for biogas production and the development and optimization of processes adjusted to these substrates. This study deals with evaluation of sea weeds (Saccharina Lattisima and Laminaria digitata). Biomethane potential tests (BMP) have shown the methane potential of the algae to be 180-440 l CH4/kg organic material. These potentials are in the same range as potentials found for commonly used substrates such as sewage sludge and slaughterhouse waste. Sampling of produced biogas, substrate and digest were performed by using Solid Phase Microextraction (SPME) followed by analysis by a Gas Chromatograph with a Mass Spectrometrer (GC-MS) in order to develop a method to be able to characterize, monitor and possibly control the process.

Place, publisher, year, edition, pages
ETA-Florence Renewable Energies, 2016
Series
European Biomass Conference and Exhibition Proceedings, ISSN 2282-5819
Keywords
energy balance, harvesting, nitrogen/carbon ratios, circular economy
National Category
Bioenergy
Research subject
Natural Science
Identifiers
urn:nbn:se:lnu:diva-61616 (URN)10.5071/24thEUBCE2016-2DO.7.6 (DOI)9788889407165 (ISBN)
Conference
24th European Biomass Conference : Setting the course for a biobased economy. Held in Amsterdam, The Netherlands, 6 - 9 June 2016
Available from: 2017-03-22 Created: 2017-03-22 Last updated: 2017-03-22Bibliographically approved
Ibrahim, M. A., Laohaprapanon, S., Rupar-Gadd, K., Wiman, B. L. .. & Hogland, W. (2015). Mitigating the emissions released from spontaneous fires at biomass storages: A footstep towards sustainability. In: 23rd European Biomass Conference and Exhibition, Vienna, Austria, 1-4 June 2015: . Paper presented at 23rd European Biomass Conference and Exhibition, Vienna, Austria, 1-4 June 2015 (pp. 1550-1557). , 23
Open this publication in new window or tab >>Mitigating the emissions released from spontaneous fires at biomass storages: A footstep towards sustainability
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2015 (English)In: 23rd European Biomass Conference and Exhibition, Vienna, Austria, 1-4 June 2015, 2015, Vol. 23, p. 1550-1557Conference paper, Published paper (Refereed)
Abstract [en]

Fires at the  material storages sites of manucipal and industrial sectors are a major environmental risk and have increased significantly. Toxic emissions released from such open fires have severe environmental and health consequences. Considering that it is not possible to install any unit operation to control the emissions released from such open fires, the possibilities to employ natural vegetation to act as a sink for aerosol particles released from open fires was investigated. A series of tests was conducted in a controlled wind tunnel environment. Smoke was generated in a smoke-aerosol generator and measurements of smoke concentrations upwind and downwind of “green filter packs” (vegetation filters) were made. Measurements involved laser-based particle counters, two-stage Nuclepore filter systems, and Solid Phase Microextraction (SPME) techniques followed by Gas Chromatography-Mass Spectrometry (GC-MS). The main objective of the work was to illustrate ways to design experiments that can assist in the study of vegetation as “pollution screens”. Our observations and findings imply that several refinements to the experimental design will be needed, including with respect to methods for assessing the distribution of particle number and mass as a function of particle size.

Series
European Biomass Conference and Exhibition Proceedings, ISSN 2282-5819 ; 23
Keywords
spontaneous fire, biomass storage, emissions, vegetation filter, smoke-aerosol
National Category
Energy Engineering Environmental Sciences
Research subject
Technology (byts ev till Engineering), Bioenergy Technology
Identifiers
urn:nbn:se:lnu:diva-51939 (URN)10.5071/23rdEUBCE2015-4AV.2.26 (DOI)9788889407516 (ISBN)
Conference
23rd European Biomass Conference and Exhibition, Vienna, Austria, 1-4 June 2015
Available from: 2016-04-05 Created: 2016-04-05 Last updated: 2017-04-18Bibliographically approved
Rupar-Gadd, K. & Zethraeus, B. (2015). Safety, Self-Ignition and Storage: Investigation of Woody and Oily Biomass Samples. In: 23rd European Biomass Conference and Exhibition, Vienna, Austria, 1-4 June 2015: . Paper presented at 23rd European Biomass Conference and Exhibition, Vienna, Austria, 1-4 June 2015 (pp. 642-645). ETA-Florence Renewable Energies, 23
Open this publication in new window or tab >>Safety, Self-Ignition and Storage: Investigation of Woody and Oily Biomass Samples
2015 (English)In: 23rd European Biomass Conference and Exhibition, Vienna, Austria, 1-4 June 2015, ETA-Florence Renewable Energies , 2015, Vol. 23, p. 642-645Conference paper, Published paper (Refereed)
Abstract [en]

The current investigation focused on obtaining experimental results on properties of different woody and oily biomasses during lab-scale storage. During large-scale storage of vegetable oils, biodiesel and woody biomasses, physical, biological and chemical processes lead to deterioration of the fuel, self-heating and in some cases to self-ignition. The heat released from the different biomass samples was measured by isothermal calorimetry, with the purpose to assess the biomass suitability for storage. The highest thermal output came from the boiled linseed oil, but also from olive oil. Wood pellets give rise to different levels of thermal output during storage and the levels depend on the moisture content, ambient gas media but not the resin content. The total energy release, as well as the peak value for the thermal power development in the individual ampoules, was limited by the amount of oxygen present. In spite of this, chemical heat release rates well exceeding 50 W/tonne were registered already at a sample temperature of 50 °C. The results are intended to be useful when planning for the large-scale use of different biomasses, leading to the need of storage. By measuring the heat released from different biomass samples, the biomass suitability for storage can be assessed. 

Place, publisher, year, edition, pages
ETA-Florence Renewable Energies, 2015
Series
European Biomass Conference and Exhibition, ISSN 2282-5819 ; 23
Keywords
self-ignition, biomass, oil, pellet
National Category
Environmental Engineering
Research subject
Technology (byts ev till Engineering), Bioenergy Technology
Identifiers
urn:nbn:se:lnu:diva-51938 (URN)10.5071/23rdEUBCE2015-2DO.2.5 (DOI)978-88-89407-516 (ISBN)
Conference
23rd European Biomass Conference and Exhibition, Vienna, Austria, 1-4 June 2015
Available from: 2016-04-05 Created: 2016-04-05 Last updated: 2016-05-26Bibliographically approved
Rupar-Gadd, K., Wiman, B., Ibrahim, M. A., Laohaprapanon, S. & Hogland, W. (2014). A theoretical and experimental framework for the study of vegetation as a screen against aerosol pollution.
Open this publication in new window or tab >>A theoretical and experimental framework for the study of vegetation as a screen against aerosol pollution
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2014 (English)Report (Other academic)
Abstract [en]

It is well known that vegetation acts a sink for aerosol particles, with the particle-capture efficiency strongly related to vegetation characteristics (such as dimensions of needles and leaves) and to  particle size and aerodynamic conditions. However, there is a need for studies of ways to harness this sink capacity for constructing “green screens” to help reduce aerosol-particle concentrations, and thus health effects, in downwind residential areas. In this report we present a simplified mathematical model for the particle-capture processes involved and use results of model simulations to explore ways to address the problem through experiments with vegetation-filter components (“green filter packs”) placed in a windtunnel. Because of the exploratory nature of our work, the very limited logistics available, and the severe time constraints for the work (a few weeks only were available) the report is shaped as a kind of “scientific narrative” (rather than as a traditional technical paper). A series of tests is described wherein steps are taken towards practical implementation of experimental designs and procedures  based on a simple smoke-aerosol generator and measurements of smoke concentrations upwind and downwind of “green filter packs”. Measurements involve laser-based particle counters, two-stage Nuclepore filter systems, and Solid Phase Microextraction (SPME) techniques followed by Gas Chromatography-Mass Spectrometry. The main objective of the work was thus to illustrate ways to design experiments – rather than perform full-fledged experimental work – and to show how experimental data can be processed and used to assist in the study of vegetation as “pollution screens”. Despite the very limited time available for the work, the results show that our experimental approach is able to generate relevant information; for instance, a study of the particle-filtration capacity of a “green filter pack” consisting of an arrangement with Scots pine needles yielded interesting data.  Also, the  study suggests opportunities for more systematic comparisons between theory and practice, inasmuch it showed how, in principle, parameters involved in the mathematical model can be quantified. The SPME tests also provided interesting information with respect to chemical characteristics of the smoke-aerosol that was generated for the experiments. However, the tests with Nuclepore-filter sampling as well as the SPME applications showed needs for improving the smoke-generation method so that high and stable smoke-aerosol concentrations can be maintained over long periods (several hours).

 

 

Our observations and findings imply that several refinements to the experimental design will be needed, including with  respect to methods for assessing the distribution of particle number and mass as a function of particle size (in the present study, the distribution is indicated by two particle-size classes only, 0.5 to 5 μm and >5 μm). Several other needs for improving the modelling as well experimental approach are also discussed in the report. Finally, a few observations on the needs for field-based studies are made together with remarks on the implications of the multi-disciplinary nature of this kind of work, with is linkages to the broader air-pollution context.

Publisher
p. 50
National Category
Other Chemical Engineering
Research subject
Natural Science, Environmental Science
Identifiers
urn:nbn:se:lnu:diva-37051 (URN)978-91-87925-19-1 (ISBN)
Note

Ej belagd/20150923

Available from: 2015-04-09 Created: 2014-09-17 Last updated: 2016-11-02Bibliographically approved
Rupar-Gadd, K. & Zethraeus, B. (2014). Safety and logistic aspects on biomass as RES. Växjö: Energikontor Sydost AB
Open this publication in new window or tab >>Safety and logistic aspects on biomass as RES
2014 (English)Report (Other (popular science, discussion, etc.))
Abstract [en]

The use of solid biomass is already dominant among RES not only in the South Baltic but in the European Federation as a whole and is expected to grow. With this, not only emissions from combustion but also emissions from storage and handling are apt to increase.The storage and handling of biomass is, however, not free from risks and problems.The current report discusses some of the risks associated with the large-scale handling and storage of biomass with special emphasis on the processes occurring during storage and the mechanisms behind auto-ignition.The report contains experimental results and information on different biomasses and their characteristics, with focus on the characteristics affecting the storage and handling properties. It is intended to be useful when planning for the use of different biomasses, leading to the need of storage.

Place, publisher, year, edition, pages
Växjö: Energikontor Sydost AB, 2014. p. 23
National Category
Environmental Engineering
Research subject
Technology (byts ev till Engineering)
Identifiers
urn:nbn:se:lnu:diva-41913 (URN)
Projects
European Regional Development Fund; The South Baltic Region project; RES-Chains
Available from: 2015-04-15 Created: 2015-04-09 Last updated: 2015-12-11Bibliographically approved
Kans, M., Rupar-Gadd, K. & Gunnarsson, A. (2013). School-wide approach for the degree project courses. In: Proceedings of the 9th International CDIO Conference, Massachusetts Institute of Technology and Harvard UniversitySchool of Engineering and Applied Sciences, Cambridge, Massachusetts, June 9 – 13, 2013.: Engineering Leadership in Innovation and Design. Paper presented at The 9th International CDIO Conference, Massachusetts Institute of Technology and Harvard University School of Engineering and Applied Sciences, Cambridge, Massachusetts, June 9 – 13, 2013..
Open this publication in new window or tab >>School-wide approach for the degree project courses
2013 (English)In: Proceedings of the 9th International CDIO Conference, Massachusetts Institute of Technology and Harvard UniversitySchool of Engineering and Applied Sciences, Cambridge, Massachusetts, June 9 – 13, 2013.: Engineering Leadership in Innovation and Design, 2013Conference paper, Poster (with or without abstract) (Other academic)
Abstract [en]

The poster contains a practical example of how the CDIO concept can be used for developing common course contents with the aim to improve the students’ generic and professional competences. The overall purpose is to create a school-wide spirit of community for the students and introduce CDIO for faculty.

OBJECTIVES

1. Ideas for how to coordinate school-wide activities aiming at increasing students’ generic skills and professional identity

2. Strategies for introducing the CDIO concept for the school faculty members

DESCRIPTION

For reaching high employability, students require knowledge and skills connected to the future working area, as well as generic skills and a professional attitude [1]. Ensuring these abilities is a major challenge of higher education today [2-4]. All these abilities are trained in the final independent work, where students, normally in collaboration with industry, acts as professionals while fulfilling the goals of academy. In the past, every subject had their own way of running the degree courses, but a need to coordinate the efforts for assuring the required outcome has gradually evolved. This emerging need was used as an opportunity to introduce CDIO thinking on school level, because most staff is involved in the degree project courses. Activities open for all students, such as joint introduction and lectures, workshops in literature search and a final dinner together with industry collaborators, are offered during the final semester, and general tools supporting the process have been developed, covering templates for report writing, a common web portal and a web based tool for registering of degree theses. The approach is extended with faculty pedagogic development activities, such as discussion meetings regarding generic skills training and the tutors’ role in the learning process.

Keywords
degree project, faculty CDIO introduction, generic skills and professional attitude
National Category
Pedagogical Work
Identifiers
urn:nbn:se:lnu:diva-27007 (URN)
Conference
The 9th International CDIO Conference, Massachusetts Institute of Technology and Harvard University School of Engineering and Applied Sciences, Cambridge, Massachusetts, June 9 – 13, 2013.
Available from: 2013-06-24 Created: 2013-06-24 Last updated: 2018-09-19Bibliographically approved
Welander, U., Hejazi, P., Berenberg, F., Isik, G., Rupar-Gadd, K., Strandmark, G. & Shojaosadati, A. (2010). Treatment of alpha-pinene contaminated air using biofilters with and without silicone oil. Environmental Progress & Sustainable Energy, 29(3), 313-318
Open this publication in new window or tab >>Treatment of alpha-pinene contaminated air using biofilters with and without silicone oil
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2010 (English)In: Environmental Progress & Sustainable Energy, ISSN 1944-7442, E-ISSN 1944-7450, Vol. 29, no 3, p. 313-318Article in journal (Refereed) Published
Abstract [en]

Two biofilters equal in size were filled with perlite for treatment of -pinene-contaminated air. The perlite used for one of the biofilters was partially coated with silicone oil to make the surface of the particles more hydrophobic. The filters were run at 1.5, 2.5, and 5 L/min airflow rate (3.1, 1.9, and 0.9-min retention time). The filters were operated for 5.5 months. The results showed that the silicone oil-coated filter performed better at 2.5 L/min with a maximum elimination capacity of 20 g/(m3 h) in comparison with 15 g/(m3 h) for the filter without oil. The efficiency was approximately the same for both filters at 1.5 L/min (40 g/m3 h), whereas it was slightly higher for the without oil filter at 5 L/min [35 g/(m3 h)]. The flow rate was set to 2.5 L/min once more (day 151). The results showed that the elimination capacity had increased to 35 g/(m3 h) and that the efficiency of both filters was approximately the same. The difference in results between the initial run and the later run at 2.5 L/min is probably depending on that the number of microorganisms had increased during the experiment and that the oil-containing biofilter adsorbed -pinene to a higher extent than the biofilter without silicone oil during the start-up period. © 2009 American Institute of Chemical Engineers Environ Prog, 2010

Place, publisher, year, edition, pages
Wiley InterScience, 2010
Keywords
biodegradation, terpene, wood chips, silicone oil, perlite
National Category
Microbiology
Research subject
Technology (byts ev till Engineering), Bioenergy Technology
Identifiers
urn:nbn:se:vxu:diva-7347 (URN)10.1002/ep.10414 (DOI)
Available from: 2010-02-25 Created: 2010-02-25 Last updated: 2017-12-12Bibliographically approved
Rupar-Gadd, K., Strandmark, G. & Welander, U. (2008). Biological treatment of air polluted with alpha-pinene..
Open this publication in new window or tab >>Biological treatment of air polluted with alpha-pinene.
2008 (English)Conference paper, Published paper (Refereed)
Series
16 th European Biomass & Exhibition, 2-6 June, Valencia, Spain
Research subject
Technology (byts ev till Engineering), Bioenergy Technology
Identifiers
urn:nbn:se:lnu:diva-9233 (URN)
Available from: 2010-11-03 Created: 2010-11-03 Last updated: 2017-01-13Bibliographically approved
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Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-2961-296X

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