Blar i NTNU Open på forfatter "Brakstad, Odd Gunnar"
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Biodegradation of Dispersed Oil in natural Seawaters from Western Greenland and a Norwegian fjord
Brakstad, Odd Gunnar; Davies, Emlyn John; Ribicic, Deni; Winkler, Anika; Brönner, Ute; Netzer, Roman (Journal article; Peer reviewed, 2018)With increasing oil exploration, production and transportation in the Arctic, predictions of the fate of spilled oil become important, including oil compound biodegradation. The use of chemical dispersants may result in ... -
Biodegradation of oil films with different thicknesses in marine environments - Hydrocarbon degradation and microbial communities
Tronstad, Christina W (Master thesis, 2017)The purpose of this study is to examine the effect of different oil film thicknesses on the biodegradation rate and microbial communities, focusing on medium sized oil films (50-500 µl). Initially, three approaches for ... -
Biodegradation of oil spill dispersant surfactants in cold seawater
Brakstad, Odd Gunnar; Størseth, Trond Røvik; Brunsvik, Anders; Bonaunet, Kristin; Faksness, Liv Guri (Journal article; Peer reviewed, 2018)While biodegradation of chemically dispersed oil has been well documented, only a few studies have focused on the degradation of the dispersant compounds themselves. The objective of this study was to determine the ... -
Biodegradation of weathered crude oil in seawater with frazil ice
Lofthus, Synnøve; Bakke, Ingrid; Tremblay, Julien; Greer, Charles; Brakstad, Odd Gunnar (Peer reviewed; Journal article, 2020)As ice extent in the Arctic is declining, oil and gas activities will increase, with higher risk of oil spills to the marine environment. To determine biotransformation of dispersed weathered oil in newly formed ice, oil ... -
Biodegradation-mediated alterations in acute toxicity of water-accommodated fraction and single crude oil components in cold seawater
Brakstad, Odd Gunnar; Størseth, Trond Røvik; Rønsberg, Marianne Unaas; Hansen, Bjørn Henrik (Journal article; Peer reviewed, 2018)Hydrocarbon biodegradation may be slower in cold Arctic than in temperate seawater, and this will affect the toxicity time window of the hydrocarbons. In this study, the acute toxicities of water-soluble phases of ... -
Characterization of 2-Piperidineethanol and 1-(2-Hydroxyethyl)piperidine as strong bicarbonate forming solvents for CO2 Capture
Hartono, Ardi; Rennemo, Rune; Awais, Muhammad; Vevelstad, Solrun Johanne; Brakstad, Odd Gunnar; Kim, Inna; Knuutila, Hanna K (Journal article; Peer reviewed, 2017)The solubility of CO2 in the aqueous solutions of 50 mass% 2-Piperidineethanol (2-PPE) and 40 mass% 1-(2-Hydroxyethyl)pyrrolidine (1-(2HE)PRLD) was measured at temperatures from 40 to 120 °C at CO2 loading from 0.04 to 0.8 ... -
Comparison of microbial community dynamics induced by distinct crude oil dispersions reveals compositional differences
Ribicic, Deni; Netzer, Roman; Winkler, Anika; Brakstad, Odd Gunnar (Journal article; Peer reviewed, 2018)To understand the impact of oil contamination on marine microbial communities, numerous studies have been conducted following microbial dynamics after oil spills and concerning the effects of different environmental ... -
Comparison of two field systems for determination of crude oil biodegradation in cold seawater
Langeloh, Hendrik Hinrich; Greer, Charles W.; Vergeynst, Leendert; Hakvåg, Sigrid; Øverjordet, Ida Beathe; Bakke, Ingrid; Sørensen, Lisbet; Brakstad, Odd Gunnar (Journal article; Peer reviewed, 2024)Marine oil spills have devastating environmental impacts and extrapolation of experimental fate and impact data from the lab to the field remains challenging due to the lack of comparable field data. In this work we compared ... -
Dispersibility and biotransformation of oils with different properties in seawater
Brakstad, Odd Gunnar; Farooq, Umer; Ribicic, Deni; Netzer, Roman (Journal article; Peer reviewed, 2018)Dispersants are used to remove oils slicks from sea surfaces and to generate small oil-droplet dispersions, which may result in enhanced biodegradation of the oil. In this study, dispersibility and biodegradation of ... -
The effects of temperature and ice on biodegradation of crude oil
Lofthus, Synnøve (Doctoral theses at NTNU;2021:46, Doctoral thesis, 2021)Summary of thesis: This thesis investigates the effect of seawater temperature and presence of ice on biodegradation of oil. The work was done as a part of the project “Fate, behaviour and response to oil drifting into ... -
Korrosjon av Stål i Ferskvann
Bengtsson Blucher, Daniel; Knudsen, Ole Øystein; Brakstad, Odd Gunnar; Hakvåg, Sigrid; Johnsen, Roy (Research report, 2022)Det er i dag en diskusjon gående om korrosjon og korrosjonsmonn på pæler som skal stå i Mjøsa. Mjøsa er ferskvann, og det gjelder pæler på lengder opp mot 100 meter, og ca 50 meter av pælen vil stå i ferskvannet. Det er ... -
Microbial communities in seawater from an Arctic and a temperate Norwegian fjord and their potentials for biodegradation of chemically dispersed oil at low seawater temperatures
Ribicic, Deni; Netzer, Roman; Winkler, Anika; Brakstad, Odd Gunnar (Journal article; Peer reviewed, 2018)Biodegradation of chemically dispersed oil at low temperature (0–2 °C) was compared in natural seawater from Arctic (Svalbard) and a temperate (Norway) fjords. The oil was premixed with a dispersant (Corexit 9500) and ... -
Microbial community and metagenome dynamics during biodegradation of dispersed oil reveals potential key-players in cold Norwegian seawater
Ribicic, Deni; Netzer, Roman; Hazen, Terry C.; Techtmann, Stephen M.; Drabløs, Finn; Brakstad, Odd Gunnar (Journal article; Peer reviewed, 2018)Oil biodegradation as a weathering process has been extensively investigated over the years, especially after the Deepwater Horizon blowout. In this study, we performed microcosm experiments at 5 °C with chemically dispersed ... -
Modelling biodegradation of crude oil components at low temperatures
Nordam, Tor; Lofthus, Synnøve; Brakstad, Odd Gunnar (Journal article; Peer reviewed, 2020)For oil spilled at sea, the main weathering processes are evaporation, emulsification, photo-oxidation, dispersion and biodegradation. Of these, only biodegradation may completely remove hydrocarbons from the environment ... -
Oil type and temperature dependent biodegradation dynamics. Combining chemical and microbial community data through multivariate analysis
Ribicic, Deni; McFarlin, Kelly Marie; Netzer, Roman; Brakstad, Odd Gunnar; Winkler, Anika; Throne-Holst, Mimmi; Størseth, Trond Røvik (Journal article; Peer reviewed, 2018)Background This study investigates a comparative multivariate approach for studying the biodegradation of chemically dispersed oil. The rationale for this approach lies in the inherent complexity of the data and challenges ... -
Stability of Structurally Varied Aqueous Amines for CO2 Capture
Buvik, Vanja; Vevelstad, Solrun Johanne; Brakstad, Odd Gunnar; Knuutila, Hanna K (Peer reviewed; Journal article, 2021)Eighteen structurally varied amines were subjected to harsh oxidative conditions, and their stability was assessed and seen in the context of biological and thermal stability. Steric effects play a large role in the ... -
SubSea Dispersant lnjection (SSDI)- a "state of the art" and the need for further documentations
Daling, Per Snorre; Brakstad, Odd Gunnar; Brandvik, Per Johan; Davies, Emlyn J.; Grøsvik, Bjørn Einar; Meier, Sonnich; Nepstad, Raymond; Nordtug, Trond; Vikebø, Frode Bendiksen (;2017:00007 A, Research report, 2017)The aim of this pre-project has been to give a "State-of the art" and describe the R&D challenges and documentation needed in order to perform robust NEBA (Net Environmental Benefit Analysis) where SubSea Dispersant Injection ... -
Temperature Effects on Biodegradation of Dispersed Crude Oil: Degradation Rates and Microbial Communities Associated with Degradation of Oil Droplets
Lofthus, Synnøve (Master thesis, 2014)Depending on the weather- and sea conditions, oil spilled at sea may disperse into the water column. Dispersion of oil promotes biodegradation of oil hydrocarbons (HCs) due to an increased surface-to-volume ratio. In this ... -
The effect of chemically dispersed oil on marine microbial communities of Norwegian seawater - A molecular and ecological approach
Ribičić, Deni (Doctoral theses at NTNU;2018:98, Doctoral thesis, 2018)SAMMENDRAG Produksjon av olje og relaterte undersøkelser har foregått på norsk sokkel i omlag 50 år, og interessen for slik aktivitet i framtida har åpenbart ikke minket. Det finnes tvert imot planer for å utvide ...