Blar i NTNU Open på forfatter "Østerhus, Stein Wold"
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A Comparison of Direct Membrane Filtration and Moving Bed Biofilm Reactor for Municipal Wastewater Treatment in Norway
Klaastad, Eline (Master thesis, 2020)Med et økende fokus på miljø og bærekraft, bør også infrastruktur som avløpsrensing rustes for fremtiden, med vekt på kompakthet, lavt karbonfotavtrykk og potensiale for energigjenvinning. To konsepter som kan vurderes i ... -
A coupled modeling of design and investment parameters for optimal operation of methane bioreactors: Attainable region concept approach
Neba Abunde, Fabrice; Nana, Aseidu; Addo, Ahmad; Morken, John; Østerhus, Stein Wold; Seidu, Razak (Journal article; Peer reviewed, 2020)Current practice to design methane bioreactors does not consider all degrees of freedom simultaneously, which raises question of global optimality. This study presents a model-based design framework, which simultaneously ... -
Assessment of theoretical and practical aspects of the Salsnes filtration unit
Søraunet, Anders Gåre (Master thesis, 2012)ABSTRACT Salsnes Filter delivers a technology used for primary treatment of wastewater. The technology could be described as a rotating belt sieve with continuously air cleaning of the sieve cloth. The process is referred ... -
Backpulsing strategy for membrane fouling control in produced water treatment
Zhang, Yeqing (Master thesis, 2017)This study focused on the membrane cleaning methodology of backpulsing (BP) in the filtration of synthesized produced water (PW) with α-aluminum oxide ceramic membranes. The purpose of this research is to screen three BP ... -
Backpulsing strategy for membrane fouling control in produced water treatment
Zhang, Yeqing (Master thesis, 2017)This study focused on the membrane cleaning methodology of backpulsing (BP) in the filtration of synthesized produced water (PW) with α-aluminum oxide ceramic membranes. The purpose of this research is to screen three BP ... -
Backpulsing technology for membrane fouling mitigation in produced water treatment
Gao, Yinghong (Doctoral theses at NTNU;2022:220, Doctoral thesis, 2022)Produced water from oil and gas industry poses an immense threat to the environment due to its substantial volume and complicated composition. Membrane filtrations especially with ceramic membranes can effectively remove ... -
Biodigester Rapid Analysis and Design System (B-RADeS): A candidate attainable region-based simulator for the synthesis of biogas reactor structures
Neba, Fabrice Abunde; Nana, Aseidu; Ahmad, Addo; Morken, John; Østerhus, Stein Wold; Seidu, Razak (Journal article; Peer reviewed, 2020)Anaerobic digesters are seldom designed based on process kinetics, but rather on a combination of hydraulic and organic loading, which may limit operational performance. This study focuses on the incorporation of process ... -
Biogas production from multi-fuel substrate: Experimental results and process evaluation
Svensson, Kine (Master thesis, 2012)A multi fuel biogas plant is under planning at Fiborgtangen, Norway. The plant will utilize biogas from several different sources, including fish silage, animal manures, sludge from the paper factory and straw. In order ... -
Biological nitrogen removal in recirculating aquaculture systems (RAS): Adaptation of a biological treatment process based on partial nitrification and anammox to RAS conditions
Risnes, Lea (Master thesis, 2022)Biologisk vannrensing i resirkulerende akvakultur systemer (RAS) består vanligvis av nitrifisering, en bakteriell prosess der ammonium, et giftig restprodukt som skilles ut av fisk, omdannes til nitrat. Nitrat kan fjernes ... -
Biological Phosphorous Removal in a Continuous MBBR - Daily monitoring, observations and kinetic experiments during the start-up phase
Finstad, Ingvild Kyrkjeeide (Master thesis, 2018)My master thesis is a small part of a larger project called RECOVER. The overall aim of RECOVER is to research the sustainability and reusability of wastewater resources. This master thesis investigates biological removal ... -
Can the operating limits of biogas plants operated under non-isothermal conditions be defined with certainty? Modeling self-optimizing attainable regions.
Neba, Fabrice Abunde; Tornyeviadzi, Hoese Michel; Asiedu, Nana Y.; Addo, Ahmad; Morken, John; Østerhus, Stein Wold; Seidu, Razak (Peer reviewed; Journal article, 2020)Uncertainty in operating parameters such as temperature undermines the reliability of using kinetic models in performance projections for plants operated under ambient non-isothermal conditions. This study develops a ... -
Characterization of photocatalytic materials used for water treatment
Emdal, Thorbjørn Salmelid (Master thesis, 2015)As the pressure on water bodies throughout the world is increasing, good water quality obtained through water treatment is essential to secure health and welfare of the population. Many chemical compounds used in industry ... -
Characterization of photocatalytic materials used for water treatment
Emdal, Thorbjørn Salmelid (Master thesis, 2015)As the pressure on water bodies throughout the world is increasing, good water quality obtained through water treatment is essential to secure health and welfare of the population. Many chemical compounds used in industry ... -
A comparison of two seawater adaptation strategies for Atlantic salmon post-smolt (Salmo salar) grown in recirculating aquaculture systems (RAS): Nitrification, water and gut microbiota, and performance of fish
Fossmark, Ragnhild Olsen; Attramadal, Kari; Kristian, Nordøy; Østerhus, Stein Wold; Vadstein, Olav (Peer reviewed; Journal article, 2021)The land-based production phase in Norwegian Atlantic salmon farming has the past years been extended to include post-smolt for an increasing number of farmers. Post-smolt production can involve introduction of brackish/seawater ... -
Crystallization kinetics and growth of struvite crystals by seawater versus magnesium chloride as magnesium source: Towards enhancing sustainability and economics of struvite crystallization
Shaddel, Sina; Grini, Tonje; Andreassen, Jens-Petter; Østerhus, Stein Wold; Ucar, Seniz (Peer reviewed; Journal article, 2020)The recycling of nutrients from wastewater and their recovery in the form of valuable products is an effective strategy to accelerate the circular economy concept. Phosphorus recovery from wastewater by struvite crystallization ... -
Deammonifisering av Rejekt Forbehandlet med Termisk Hydrolyse
Johnsen, Josefin (Master thesis, 2019)Cambi sin termiske hydrolyse prosess(THP) er en kjent og effektiv forbehandlingsprosess for slam før den stabiliseres i en råtnetank. Vannstrømmen som resulterer etter at det fordøyde slammet er avvannet, er rik på ammonium ... -
Degradation of DEET and DEP by Ozonation using pCBA as a Hydroxyl Radicals Probe Compound
Migowska, Aleksandra Malgorzata (Master thesis, 2015)The main aim of this thesis was to examine and describe the process of ozonation of two chosen micopollutants present in grey water. These micropollutants are: n,n-diethyl-m-toluamide (DEET) and diethyl phthalate (DEP). ... -
Degradation of DEET and DEP by Ozonation using pCBA as a Hydroxyl Radicals Probe Compound
Migowska, Aleksandra Malgorzata (Master thesis, 2015)The main aim of this thesis was to examine and describe the process of ozonation of two chosen micopollutants present in grey water. These micropollutants are: n,n-diethyl-m-toluamide (DEET) and diethyl phthalate (DEP). ... -
Effects of Fermented Primary Sludge Supernatant as Carbon Source in an Enhanced Biological Phosphorous Removal Process
Svendby, Kine Hagelund (Bachelor thesis, 2019)Formålet med denne masteroppgaven er å undersøke og optimalisere biologisk fosforfjerning i en reaktor med biofilm bærere. Ved ulike konsentrasjoner i avløpsvannet og ulike forhold. Spesielt ved kalde temperaturer (11-14°C) ... -
Effects of reduced organic matter loading through membrane filtration on the microbial community dynamics in recirculating aquaculture systems (RAS) with Atlantic salmon parr (Salmo salar)
Fossmark, Ragnhild Olsen; Vadstein, Olav; Rosten, Trond Waldemar; Bakke, Ingrid; Koseto, Deni; Bugten, Anette Voll; Helberg, Gaute Alexander Nedberg; Nesje, Jenny; Jørgensen, Niels O.G.; Raspati, Gema Sakti; Azrague, Kamal; Østerhus, Stein Wold; Attramadal, Kari (Peer reviewed; Journal article, 2020)A key challenge in recirculating aquaculture systems (RAS) is the accumulation of particulate organic matter, especially the fine and colloidal fraction due to low removal efficiency of today's technology. The supply of ...