Blar i NTNU Open på forfatter "Østerhus, Stein Wold"
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Engineering of struvite crystals by regulating supersaturation – Correlation with phosphorus recovery, crystal morphology and process efficiency
Shaddel, Sina; Ucar, Seniz; Andreassen, Jens-Petter; Østerhus, Stein Wold (Journal article; Peer reviewed, 2019)Struvite crystallization is widely applied for nutrient recovery from wastewater streams. The better understanding of the effects of reaction conditions on final crystal properties will contribute to improve both the ... -
Enhanced Biological Phosphorus Removal in Typical Norwegian Wastewater
Richardsen, Kristine Lagesen (Master thesis, 2017)Discharge of wastewater containing excess amounts of nutrients such as phosphorus (P) cause eutrophication of the receiving waterbodies. The consequences related to eutrophication can vary in severity, from esthetical ... -
Enhancing efficiency and economy of phosphorus recovery process by customizing the product based on sidestream characteristics
Shaddel, Sina; Ucar, Seniz; Andreassen, Jens-Petter; Østerhus, Stein Wold (Journal article; Peer reviewed, 2019)The enhanced biological phosphorus removal process makes the phosphorus recovery feasible from the dewatering streams of biological sludge. The physicochemical properties of these sidestreams, as an input to a crystallizer, ... -
Filtralite Mono-Multi Fine as an Alternative to Anthracite/Sand Used in the Molde Process
Vålen Jonassen, Pernille (Master thesis, 2016)The objective of this Master thesis was to find out if a new filter combination called Filtralite Mono-Multi Fine (FMMF) could be used as an alternative to the conventional media combination anthracite and sand. The FMMF ... -
Implementation of phosphorus stripping in sludge
Fiksdal, Dag Birger (Master thesis, 2018)Anaerobic mixer, struvite, Bio-P, EBPR, Recovery, Sludge -
Mass balance calculations of IVARs wastewater treatment plant - Enhanced biological phosphorus removal based on an activated sludge system
Danielsen, Anne (Master thesis, 2018)This master thesis is written as a collaboration between NTNU and IVAR. IVAR's largest wastewater treatment plant has been the main focus, in Norwegian referred to as Sentralrenseanlegg Nord-Jæren (SNJ). The aim of this ... -
Modeling Biological Nutrient Removal in a Greywater Treatment System
Urdalen, Ivar Soares (Master thesis, 2015)Many urban centers suffer water scarcity due to increased population growth and dry periods. There has been an increased interest in developing alternative water sources for supplementing the existing urban water supply ... -
Modeling Biological Nutrient Removal in a Greywater Treatment System
Urdalen, Ivar Soares (Master thesis, 2015)Many urban centers suffer water scarcity due to increased population growth and dry periods. There has been an increased interest in developing alternative water sources for supplementing the existing urban water supply ... -
Modelling the effects of climate projections on pathogen infection risks in selected water supply systems in Norway
Mohammed, Hadi (Doctoral theses at NTNU;2019:111, Doctoral thesis, 2019)Abstract Presently, there is a consensus among scientists and policy makers that the occurrence of climate change is unequivocally clear. Erratic and extreme variations in climate variables are commonly associated with ... -
Operation of ceramic membrane treatment plant at Dampsaga Waterpark
Almasi, Mate Janos (Master thesis, 2015)In the data analysis presented the main problems, what should be fixing in the future. The first step is to investigate all the water quality measuring devices at the process lines. Especially at process line D, because ... -
Phosphorus stripping of Bio-P sludge in cold conditions
Prestvik, Johanne (Bachelor thesis, 2019)Fosfor blir på mange renseanlegg fjernet fra avløpsvannet ettersom utslipp av for mye fosfor kan føre til eutrofiering av akvatiske systemer. Fosfor er også et veldig viktig næringsstoff, som alt liv er avhengig av. Fosfor ... -
Real-time monitoring of enhanced biological phosphorus removal in a multistage EBPR-MBBR using a soft-sensor for phosphates.
Muralidharan Nair, Abhilash; Gonzalez Silva, Blanca Magdalena; Haugen, Finn; Ratnaweera, Harsha; Østerhus, Stein Wold (Peer reviewed; Journal article, 2020)Enhanced biological phosphorus removal (EBPR) from municipal wastewater has been achieved in a multistage Moving Bed Biofilm Reactor (MBBR) configuration. The process operations can be further optimized by real-time ... -
Removal of the Micropollutants DEET and DEP in biological Grey Water Treatment and the Effect of DEP on microbiological Processes
Geiling, Eva-Linde (Master thesis, 2015)The insect repellent N,N-diethyl-m-toluamide (DEET) and the plasticizer Diethyl Phthalate (DEP) are commonly used in externally applied personal care products. Washed off the skin, they are found in grey water. If the grey ... -
Removal of the Micropollutants DEET and DEP in biological Grey Water Treatment and the Effect of DEP on microbiological Processes
Geiling, Eva-Linde (Master thesis, 2015)The insect repellent N,N-diethyl-m-toluamide (DEET) and the plasticizer Diethyl Phthalate (DEP) are commonly used in externally applied personal care products. Washed off the skin, they are found in grey water. If the grey ... -
Seawater as Magnesium Source for Struvite Crystallization in Wastewater - An assessment of seawater as an alternative magnesium source of struvite production in wastewater treatment plants
Grini, Tonje (Master thesis, 2018)Phosphorus (P) from wastewater and agricultural fertilizers are discharged to water bodies and contribute to eutrophication. At the same time, phosphate rock used for fertilizer production is a non-renewable resource that ... -
Self-optimizing attainable regions of the anaerobic treatment process: Modelling performance targets under kinetic uncertainty
Neba, Fabrice Abunde; Tornyeviadzi, Hoese M.; Østerhus, Stein Wold; Seidu, Razak (Journal article; Peer reviewed, 2020)Despite the advantage of model-based design, anaerobic digesters are seldom designed using biokinetic models due to lack of reliable kinetic coefficients and/or systematic approaches for incorporating kinetic models into ... -
Simulation of two-dimensional attainable regions and its application to model digester structures for maximum stability of anaerobic treatment process
Neba, Fabrice Abunde; Asiedu, Nana Yaw; Addo, Ahmad; Morken, John; Østerhus, Stein Wold; Seidu, Razak (Journal article; Peer reviewed, 2019)Unlike high-rate anaerobic digesters that employ some mechanism to retain microbial sludge mass, low-rate systems use sufficiently long hydraulic retention times to ensure process stability, which becomes economically ... -
Simultaneous nitrification and denitrifying phosphate uptake in a continuous moving bed biofilm reactor (The HIAS-process)
Lomnes, Bente Skårholen (Master thesis, 2018)Nutrients such as nitrogen (N) and phosphorus (P) can cause eutrophication and harmful algal blooms in waterbodies. Removal of these nutrients from wastewater discharges are therefore necessary to insure healthy waters. ... -
Struvite crystallization by using raw seawater: Improving economics and environmental footprint while maintaining phosphorus recovery and product quality
Shaddel, Sina; Grini, Tonje; Ucar, Seniz; Azrague, Kamal; Andreassen, Jens-Petter; Østerhus, Stein Wold (Peer reviewed; Journal article, 2020)Seawater, as an alternative magnesium source, has the potential to improve the overall economics and environmental footprint of struvite production compared to the use of pure magnesium salts. However, the dilution effect ... -
Sustainable Microalgae Cultivation for Biogas Production: A Technical and Economic Analysis
Ramos Alves, Frederico (Master thesis, 2016)Microalgae cultivation using waste streams as nutrient source in industrial scale is an unconventional, and so far untapped, process pathway to produce microalgae biomass. The main advantage of this approach is the fact ...