Blar i NTNU Open på forfatter "Morken, John"
-
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 ... -
A novel simulation model, BK_BiogaSim for design of onsite anaerobic digesters using two-stage biochemical kinetics: Codigestion of blackwater and organic waste
Neba, Fabrice Abunde; Asiedu, Nana Yaw; Morken, John; Ahmad, Addo; Seidu, Razak (Journal article; Peer reviewed, 2020)The design of biogas reactors for blackwater treatment provides special challenges due to significant variability in blackwater characteristics, the complexity of biological systems, and the need, in many cases, to operate ... -
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 ... -
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 ... -
Determination of kinetic constants from the co-digestion of dairy cow slurry and municipal food waste at increasing organic loading rates
Morken, John; Gjetmundsen, Magnus; Fjørtoft, Kristian (Journal article; Peer reviewed, 2017)The aim of this study was to investigate the performance and the kinetic constants of anaerobic mesophilic CSTR reactors run at increasing organic loading rates (OLR). The reactors were co-digesting dairy cow slurry (DCS) ... -
Pre-treatment methods for straw for farm-scale biogas plants
Fjørtoft, Kristian; Morken, John; Hanssen, Jon Fredrik; Briseid, Tormod (Journal article; Peer reviewed, 2019)This study investigated the effect of five different pre-treatment methods (ammonia (NH3), caustic soda (NaOH), dry milling, hot water and steam explosion) for straw for biogas production. The methods were selected based ... -
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 ... -
Use of attainable regions for synthesis and optimization of multistage anaerobic digesters
Neba, Fabrice Abunde; Asiedu, Nana Yaw; Addo, Ahmad; Morken, John; Østerhus, Stein Wold; Seidu, Razak (Journal article; Peer reviewed, 2019)Anaerobic digestion involves multiple reactions, and when operated as a single stage, the process conditions are only suitable for all the reactions with no particular reaction being optimized, hence limiting overall ...