Et profilbilde

Associate Professor
Roald Kommedal { "honorific-suffix": "Associate Professor", "fn": "Roald Kommedal", "tel": "Telephone: +47 51831852", "email": "roald.kommedal@uis.no" }

Faculty Faculty of Science and Technology
Department Department of Chemistry, Bioscience and Environmental Engineering
Room KE C-218

Research fields

Environmental Science & Technology (general)

Disciplines: Water Science and Technology, Environmental Biotechnology, Microbial Ecology

Topics: Biodegradation, Biofilms, Constructed Wetlands, Anaerobic Wastewater treatment, Bioprocess modeling

Selected publications

Ravndal, Kristin Torgersen; Opsahl, Eystein; Bagi, Andrea; Kommedal, Roald (2018). Wastewater characterisation by combining size fractionation, chemical composition and biodegradability. Water Research. 131, 151-160.

Ravndal, Kristin Torgersen; Kommedal, Roald (2017). Starch degradation and intermediate dynamics in flocculated and dispersed microcosms. Water Science and Technology, 76(11), 2928-2940. DOI: 10.2166/wst.2017.467.

Bagi, A., D. M. Pampanin, A. Lanzén, T. Bilstad, and R. Kommedal (2014). Naphthalene Biodegradation in Temperate and Arctic Marine Microcosms. Biodegradation, (1): 111-125

Bagi, A., D. M., Pampanin, O. G. Brakstad, and R. Kommedal (2013). Estimation of Hydrocarbon Biodegradation Rates in Marine Environments: A Critical Review of the Q10 Approach. Marine Environmental Research 89: 83-90.

Kommedal, R., Milferstedt, K., Bakke, R. and Morgenroth, E. (2006): Effects of initial molecular weight on removal rate of dextran in biofilms, Water Research, (9), pp. 1795-1804

Morgenroth, E., Kommedal, R. and Harremoës, P. (2001): Processes and modeling of hydrolysis of particulate organic matter in aerobic wastewater treatment - A review, Water Science and Technology, (6), pp. 25-40

Kommedal, R., Bakke, R., Stoodley, P. and Dockery, J. (2001): Modelling production of extracellular polymeric substances in a Pseudomonas aeruginosa chemostat culture, Water Science and Technology, (6), pp. 129-134

Bakke, R., Kommedal, R. and Kalvenes, S. (2001): Quantification of biofilm accumulation by an optical approach, J. Microbiol. Meth. , pp. 13-26

Research in progress

Work experience

Scientific publications (from Cristin)

  • Kommedal, Roald (veileder); Krahner, Friederike (2017). Retention and biological uptake of phosphorous in the Leikvollbekken constructed wetland.. UiS.
  • Kommedal, Roald (2004). Degradation of polymeric and particulate organic carbon in biofilms. Norges teknisk-naturvitenskapelige universitet. 1 p.
  • Kommedal, Roald; Bakke, Rune (2003). Modeling Pseudomonas aerugionsa biofilm detachment. Høgskolen i Telemark. 29 p.
  • Kommedal, Roald; Kumar, Gopalakrishnan; Kaster, Krista Michelle; Pala Ozkok, Ilke; Thorsen, Kristian (2018). A simple mathematical model for antimicrobial resistance gene transfer in wastewater treatment models. Nanjing University; 2018-10-28 - 2018-10-31.
  • Opsahl, Eystein; Kaster, Krista Michelle; Verpe, Ingrid; Svendsen, Linn; Meling, Silja Helene; Kommedal, Roald (2018). Biodegradability of Enhanced Oil Recovery Polymers in Seawater and Their Effect on the Microbial Community. Norwegian Society of Microbial Ecology; 2018-05-28 - 2018-05-29.
  • Safitri, Anissa Sukma; Farsi, Ali; Kaster, Krista Michelle; Kommedal, Roald (2018). Integrated Wastewater Treatment Concept for Water Resource Recovery. International Water Association; 2018-05-25 - 2018-06-27.
  • Safitri, Anissa Sukma; Kaster, Krista Michelle; Kommedal, Roald (2018). Effect of Low Temperature and Municipal Wastewater Organic Loading on UASB (Up-flow Anaerobic Sludge Blanket) Reactor Performance. International Water Association; 2018-03-18 - 2018-03-21.
  • Safitri, Anissa Sukma; Kaster, Krista Michelle; Kumar, Gopalakrishnan; Kommedal, Roald (2018). Low temperature biogas production from municipal wastewater by laboratory scale UASB granules. University of Nanjing; 2018-10-28 - 2018-10-31.
  • Kommedal, Roald (2017). Occurrence and fate of priority organic pollutants during wastewater sludge treatment. 2017-06-06.
  • Kommedal, Roald; Krahner, Friederike (2017). Phosphorous retention in a mature constructed wetland – effect of hydraulic loading fluctuations. Norsk Hydrologiråd; 2017-04-24.
  • Kommedal, Roald; Opsahl, Eystein (2017). Fate and effects of synthetic polymers - the sub-micro-plastic problem.. University of Stavanger, IRIS, RachelCarsonprisen.no; 2017-10-04.
  • Kommedal, Roald; Opsahl, Eystein (2017). Polymer and Particle Degradation in Seawater - Marine fate of synthetic polymers used for IOR. 2017-10-31 - 2017-11-13.
  • Kommedal, Roald; Opsahl, Eystein (2017). Polymer and particle degradation in the seawater. Ambassaden/gen.konsul Rio BZ og innovasjon NO; 2017-11-06 - 2017-11-07.
  • Christ, Inge; Kommedal, Roald (2016). Biogassforskning ved UiS. https://youtu.be/UrnI9-dZnUw. [Internet]; 2016-10-06.
  • Handley, Bianca; Molversmyr, Åge; Kommedal, Roald (2016). Constructed wetlands for agricultural runoff remediation – effects on bioavailability of phosphorus. International Society of Limnology; 2016-07-31 - 2016-08-05.
  • Haws, Anne Marie; Kommedal, Roald; Enge, Espen; Hill, Helene H (2016). Annual Phosphorus Retention Efficiency of a Constructed Wetland Treating Diffuse Agricultural Runoff. International Society of Limnology; 2016-07-31 - 2016-08-05.
  • Kommedal, Roald (2016). Biologisk energiproduksjon. Universitetet i Stavanger; 2016-11-13.
  • Kommedal, Roald (2016). Fosforfangst i våtmarksplanter – Hvor mye kan fjernes?. Universitetet i Stavanger; 2016-11-08.
  • Kommedal, Roald (2016). Leikvollbekken – Fosforbalanse og renseeffekt. Universitetet i Stavanger; 2016-11-08.
  • Kommedal, Roald (2016). Will we find ET and would we know?. i/o/lab; 2016-03-10 - 2016-03-13.
  • Kommedal, Roald; Ydstebø, Leif; Bilstad, Torleiv (2016). Occurrence and Fate of Priority Organica Pollutants during Wastewater Sludge Treatment. Technical Unievrsity of Crete; 2016-09-27 - 2016-09-30.
  • Kommedal, Roald; Ydstebø, Leif; Bilstad, Torleiv (2016). Occurrence and fate of priority organic pollutants during wastewater sludge treatment.
  • Opsahl, Eystein; Kommedal, Roald (2016). Environmental fate and effects of polymer produced water. Technical University of Crete; 2016-09-27 - 2016-10-01.
  • Opsahl, Eystein; Kommedal, Roald (2016). Environmental fate and effects of polymer produced water II. Technical University of Crete; 2016-09-27 - 2016-10-01.
  • Wold, Anders; Ydstebø, Leif; Kommedal, Roald; Løklingholm, Martin; Bilstad, Torleiv (2016). Anaerobic treatment of slop water.
  • Kommedal, Roald (2015). Biologisk nedbrytbarhet: Forsøksdesign og Dataanalyse. Universitetet i Stavanger; 2015-11-13.
  • Kommedal, Roald (2015). Polymers in the Environment - Fate and Effects. National IOR center UiS; 2015-11-13.
  • Kommedal, Roald; Ulas, Mona; Bagi, Andrea; Kaster, Krista Michelle (2015). The Effects of Corexit 9500 on Oil Biodegradation at Cold Temperatures.
  • Bagi, Andrea; Pampanin, Daniela M.; Lanzén, Anders; Bilstad, Torleiv; Kommedal, Roald (2014). Arctic bacteria are “as good as” temperate counterparts in removing toxic oil components from the marine environment. 2014-10-22 - 2014-10-24.
  • Kommedal, Roald (2014). 100-års jubileum for den viktigste oppfinnelsen i rensing av vann. Universitetet i Stavanger; 2014-09-28.
  • Kommedal, Roald (2014). Aktivt Slam Prosessen - Ny, gammel renseteknologi. Universitetet i Stavanger; 2014-03-11.
  • Madland, Merete Vadla; Kommedal, Roald; Hiorth, Aksel (2014). Meeting at UiS 16. June 2014 Professor Johan Sjøblom (Ugelstad Laboratory, NTNU). University of Stavanger; 2014-06-16.
  • Madland, Merete Vadla; Kommedal, Roald; Hiorth, Aksel (2014). The National IOR Centre of Norway - Research highlights abd ambitions. 2014-11-04.
  • Wold, Anders; Ydstebø, Leif; Kommedal, Roald; Løklingholm, Martin; Bilstad, Torleiv (2014). Effect of Sodium on anaerobic treatment of Ethylene Glycol. IWWG; 2014-09-02 - 2014-09-05.
  • Kommedal, Roald (2013). Hvem, Hva, Hvor (mye)? GCMS: Miljøkjemikerens orjanisk foretrukne.... Universitetet i Stavanger; 2013-11-13.
  • Ravndal, Kristin Torgersen; Kommedal, Roald (2013). Bacterial polymer degradation in natural river water. IWA; 2013-10-01 - 2013-10-04.
  • Bagi, Andrea; Lanzén, Anders; Bilstad, Torleiv; Kommedal, Roald (2012). Naphthalene degrading prokaryotic communities of Arctic and Temperate seas. International Society for Microbial Ecology; 2012-08-19 - 2012-08-24.
  • Kelland, Malcolm Andrew; Hoogenboom, Richard; Del Villano, Luca; Kommedal, Roald; Schubert, Ulrich S.; Fijten, Martin W. M. (2012). POLY(2-OXAZOLINE)S AS KINETIC GAS HYDRATE INHIBITORS. ACS; 2012-03-25 - 2012-03-29.
  • Kommedal, Roald (2012). Hydrolysis of particulate and polymeric substances in biofilms. EAWAG, ETH; 2012-11-29 - 2012-11-30.
  • Kommedal, Roald (2012). Olje og Miljøsikkerhet. Artic Biennalen 2012; 2012-10-12 - 2012-10-14.
  • Ravndal, Kristin Torgersen; Bagi, Andrea; Kommedal, Roald (2012). The effect of hydrostatic pressure on biodegradation of a mixture of benzene, toluene, ethylbenzene and o-xylene. International society for microbial ecology; 2012-08-19 - 2012-08-24.
  • Ravndal, Kristin Torgersen; Kommedal, Roald (2012). A quantitative model of bacterial particle and polymer degradation in aquatic systems. Internation society for microbial ecology; 2012-08-19 - 2012-08-24.
  • Kommedal, Roald; Bagi, Andrea; Bilstad, Torleiv; Brakstad, O.G. (2010). Biodegradation of naphthalene in Temperate and Arctic marine environment. 2010-08-22 - 2010-08-27.
  • Kelland, Malcolm; Kommedal, Roald; Del Villano, Luca (2008). A Class Of Kinetic Hydrate Inhibitor With Good Biodegradability. 2008-07-06 - 2008-07-10.
  • Morgenroth, E.; Kommedal, Roald; Harremoes, P. (2001). Process and modeling of hydrolysis of particulate organic matter in aerobic wastewater treatment : a review. 2001-11-10 - 2001-11-12.
  • Kommedal, Roald (2000). Pseudonas aeruginosa biofilm detachment. IWA; 2000-09-18 - 2000-09-20.
  • Kommedal, Roald; Bakke, Rune (2000). Modelling production of extracellular polymeric substances in a Pseudomonas aeruginosa chemostat culture. IWA; 2000-09-18 - 2000-09-20.
  • Kommedal, Roald; Thorbjørnsen, T.; Bakke, Rune (1999). Hydrolysis of adsorbed particulate organic matter in arobic films. IWA; 1999-10-17 - 1999-10-21.