Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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    Records 1 - 4 / 4

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    Simultaneous sulfate reduction and metal precipitation in an inverse fluidized bed reactor
    Villa Gomez, D.K. - \ 2013
    Wageningen University. Promotor(en): Piet Lens, co-promotor(en): Karel Keesman. - [S.l.] : S.n. - ISBN 9789461737410 - 194
    wervelbedden - uitrusting - sulfaatreductie - chemische precipitatie - metalen - fluidized beds - equipment - sulfate reduction - chemical precipitation - metals
    Alternating field activated carbon fluidized bed electrode for water disinfection
    Racyte, J. - \ 2013
    Wageningen University. Promotor(en): Huub Rijnaarts, co-promotor(en): Harry Bruning; D.R. Yntema. - S.l. : s.n. - ISBN 9789461736260 - 230
    desinfectie - hergebruik van water - afvalwaterbehandeling - verontreinigd water - elektrisch veld - wervelbedden - elektrodes - actieve kool - milieutechnologie - disinfection - water reuse - waste water treatment - polluted water - electric field - fluidized beds - electrodes - activated carbon - environmental technology
    Zoetwaterschaarste is een groot probleem voor de volksgezondheid. Ongeveer 10 % van de wereldbevolking heeft geen toegang tot veilig drinkwater en 36 % van de bevolking heeft geen basis sanitaire voorzieningen. Het grootste deel van deze mensen leeft in waterschaarse gebieden en hergebruik van water is relevant om te voorzien in de benodigde hoeveelheid zoet water. Om meer water te hergebruiken zou behandeld afvalwater gebruikt kunnen worden voor bijvoorbeeld irrigatie. Disinfectie van hergebruikt afvalwater is dan belangrijk om de veiligheid van mens en dier te waarborgen. Een mogelijke alternatieve manier van desinfectie is gebaseerd op het gebruik van elektrische velden. Sterke elektrische velden (bijvoorbeeld als gepulseerde elektrische velden) voor desinfectie van water worden al enige decennia toegepast. Echter, deze technologie maakt gebruik van een sterk elektrisch veld, wat problematisch is voor troebel water die veel organische stof bevatten. Dit kan worden vermeden door gebruik te maken van een zwak, wisselend elektrisch veld gecombineerd met een gefluïdiseerd bed elektrode (FBE) van granulaire actieve kool (GAC). Het doel van dit proefschrift is om het principe aan te tonen van deze FBE desinfectietechnologie en om de belangrijkste componenten van het onderliggende mechanisme te beschrijven.
    Modeling migration in sheared bidisperse suspensions using an effective termperature
    Sman, R.G.M. van der; Vollebregt, H.M. ; Boom, R.M. - \ 2012
    Faraday Discussions 158 (2012). - ISSN 1359-6640 - p. 89 - 103.
    pressure-driven flow - concentrated suspensions - polydisperse suspensions - numerical simulations - self-diffusion - fluidized beds - shear-flow - spheres - sedimentation - instabilities
    A model for the particle migration in a bidisperse flowing suspension is proposed and compared to experimental data. A mixture formulation, describing the suspension velocity and pressure and the concentrations of two solid fractions is derived from a multi-fluid model. In the multi-fluid model the liquid phase and both dispersed phases are interpenetrating phases. The closure relations are based on a mean field approach extending closure relations of a monodisperse suspension. The model is used to predict segregation based on particle size in channel flow where the particles are subjected to Brownian motion and shear-induced migration. The comparison of the model results with experimental data shows that particle migration is predicted well by the given formulation.
    Hydrodynamics of a liquid-liquid-solid fluidized-bed bioreactor
    Zessen, E. van - \ 2003
    Wageningen University. Promotor(en): Hans Tramper, co-promotor(en): Arjen Rinzema; Rik Beeftink. - [S.l.] : S.n. - ISBN 9789058088758 - 199
    bioreactoren - hydrodynamica - wervelbedden - fermentatie - biotechnologie - bioreactors - hydrodynamics - fluidized beds - fermentation - biotechnology
    If a batchwise bioconversion and subsequent ( i.e. serial) downstream processing are adopted as a standard production strategy, a low overall productivity may result for certain types of biotransformations (substrate- or product-inhibited fermentations). An alternative to sequential processing would be the integration of bioconversion and downstream processing by controlled supply of substrate to the reaction in situ , or by controlled removal of product from the reaction in situ . Such integration involves a multi-phase reactor in which a helper phase may serve as substrate reservoir or as product sink. A new type of multi-phase bioreactor was developed, containing a continuous liquid phase, a dispersed liquid phase, and a dispersed solid phase; it may be conceived of as a 3-phase liquid-liquid-solid fluidized bed. This thesis focuses on the hydrodynamic aspects of such a 3-phase fluidized bed; a general design strategy was developed. Within this 3-phase system, a liquid-solid fluidized bed consisting of biocatalytic gel beads in a continuous medium phase, and a liquid-liquid extraction column or spray column, consisting of organic droplets in a continuous medium phase can be discerned. The hydrodynamic characteristics of these constituent 2-phase systems were studied as well. At the end this thesis reviews the current status of the newly developed 3-phase liquid-liquid-solid fluidized-bed bioreactor; it outlines additional research to be performed for a full understanding of its hydrodynamicbehavior. Additional steps that have to be taken for practical implementation of the 3-phase fluidized bed as a new type of bioreactor are emphasized.

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