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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    Mobiele waterzuivering glastuinbouw
    Ruijven, Jim van; Os, Erik van; Vermeulen, Peter - \ 2017
    Bleiswijk : Wageningen University & Research, BU Glastuinbouw (Rapport GTB 1424) - 54
    kassen - glastuinbouw - afvalwaterbehandeling - afvalwater - waterverontreiniging - afvoer - zuiveren - waterzuivering - oppervlaktewater - oppervlaktewaterkwaliteit - gewasbescherming - pesticiden - substraten - cultuur zonder grond - mobiele uitrusting - greenhouses - greenhouse horticulture - waste water treatment - waste water - water pollution - discharge - purification - water treatment - surface water - surface water quality - plant protection - pesticides - substrates - soilless culture - mobile equipment
    Application of a mobile unit for discharge water purification is one of four options to apply to the purification obligation per 1-1-2018. Depending on the amount of discharge, future water strategy and investment options, mobile purification can be an interesting option. The amount of discharge water varies with crop, irrigation strategy and quality of the irrigation water and is between 122 and 3.340 m3/ha/year for surveyed companies. About 65% of greenhouse companies discharges
    Praktijkimplementatie zuiveringstechnieken
    Ruijven, J. van; Os, E. van; Beerling, E. ; Staaij, M. van der - \ 2016
    Bleiswijk : Wageningen UR Glastuinbouw (Rapport GTB 1419) - 42
    kasgewassen - kassen - glastuinbouw - afvoer - zuiveren - gewasbescherming - ozon - greenhouse crops - greenhouses - greenhouse horticulture - discharge - purification - plant protection - ozone
    To apply to the Dutch generic obligation to purify discharge water, each horticultural company needs to treat it’s discharge water with a technology that removes 95% of plant protection products. This report shows the process that growers need to go through to make a good choice for a purification technology: mapping of water flows, decrease the amount of discharge water, determine the strategy to apply to the generic obligation and make a choice for a purification technology. For a cucumber production company and a company that combines vegetable plant propagation and growth of potted plants this process is followed. A design for a purification system is developed and built for a semi-practice scale cucumber and sweet pepper production system. In the semi-practice scale and the cucumber production company, an ozone installation (Agrozone) is chosen, either to disinfect drain water and eventually purify discharge water. At the propagation company, an Opticlear Diamond (WaterIQ) is chosen to disinfect the drain water and eventually purify discharge water. For both installations the purification efficacy is measured. In the second part of the project the practical format for the generic obligation for discharge water purification is elaborated.
    Extraction of steviol glycosides from fresh Stevia using acidified water; clarification followed by ultrafiltration and nanofiltration
    Kootstra, A.M.J. ; Elissen, H.J.H. ; Huurman, Sander - \ 2016
    Lelystad : Wageningen UR, PPO/Acrres (Rapport / PPO-AGV 686) - 38
    separation technology - stevia - purification - biorefinery - glycosides - ultrafiltration - filtration - scheidingstechnologie - stevia - zuiveren - bioraffinage - glycosiden - ultrafiltratie - filtratie
    As part of the PPS Kleinschalige bioraffinage project (WP1b), fresh Stevia material was used in the extraction of steviol glycosides using water acidified through conversion of sugar by microorganisms naturally present on the plant. Two successive harvests from the same plot were used. Previous experiments had resulted in high steviol glycoside extraction rates of 80 % to 90 % but the purity of the final extract was low (15 % to 20 % of steviol glycosides in the dry matter). The first batch of plants was used to test a clarification step by filtration on a small scale. A second batch of plants was used to perform clarification, purification using ultrafiltration, and concentration by nanofiltration on a larger scale.
    New analytical approaches for faster or greener phytochemical analyses
    Shen, Y. - \ 2015
    Wageningen University. Promotor(en): Han Zuilhof; B. Chen, co-promotor(en): Teris van Beek. - Wageningen : Wageningen University - ISBN 9789462573307 - 206
    giftige planten - chemische samenstelling - massaspectrometrie - niet-destructief testen - bemonsteren - zuiveren - oplosmiddelen - illicium - poisonous plants - chemical composition - mass spectrometry - nondestructive testing - sampling - purification - solvents - illicium


    Chapter 1 provides a short introduction into the constraints of phytochemical analysis. In order to make them faster, less laborious and greener, there is a clear scope for miniaturized and simplified sample preparation, solvent-free extractions and the use of cleaner solvents in preparative HPLC. Possible modern techniques to achieve this, such as microfluidic chips, ambient mass spectrometry, selective magnetic nanoparticles, and use of less toxic but equally efficient solvents are discussed. Clear aims were formulated and research towards fulfilling these aims in the field of phytochemical analysis is carried out in this thesis.

    A first version of a 3-phase liquid-liquid extraction (LLE) chip for the miniaturized sample pretreatment of alkaloids was introduced by our group in 2009. In Chapter 2 more biodegradable and less-toxic solvents for the transport phase and a more suitable pH for the feed phase were evaluated. The extraction efficiency improved. On-line hyphenation of the 3-phase chip to nanoLC-UV/MS was also investigated. This combination saved a lot of time and solvent in comparison with traditional methods for the purification of alkaloids from plant materials.

    A novel Induced Phase Separation Extraction (IPSE) chip was introduced in Chapter 3 for efficient sample pretreatment. The acetonitrile – water (1:1) sample solutions were separated in organic and aqueous phases in this IPSE chip based on their affinity for both phases. In turn this could be correlated with the log D values of the analytes. Some optimization regarding design, operation, flows and solvents was carried out. Extraction efficiencies of several model compounds were determined. A real sample application with a plant used in Traditional Chinese Medicines (TCMs) was carried out to show the usefulness of the IPSE chip in dealing with complex matrixes.

    Chapter 4 presented an unambiguous distinction between toxic Japanese star anise and non-toxic Chinese star anise fruits within seconds without any sample pretreatment by DART-orbitrap MS technology. Both positive and negative mode gave the same result, although the latter mode is preferred because of its higher sensitivity and cleaner spectra. Not only raw plant materials but also a herbal tea containing both Chinese and Japanese star anise could be quickly and accurately distinguished by DART-HRMS.

    In Chapter 5, direct plant spray in combination with orbitrap HRMS allowed, like DART-HRMS, for an unambiguous distinction between toxic Japanese star anise and non-toxic Chinese star anise fruits within seconds without any sample pretreatment in both positive and negative mode. Direct plant spray ionization has the advantage of low cost, simplicity, room temperature and low standard deviations. Neither the DART nor the direct spray method is very suitable for quantitative measurements of solid samples like star anise fruits.

    Chapter 6 describes the purification of eight ginkgolic acids (GAs) from raw plant material (Ginkgo biloba) by using only three steps, namely (1) extraction; (2) selective purification by cheap Fe3O4 magnetic nanoparticles (MNPs); (3) preparative HPLC on a C8 column. The three main constituents occurring at concentrations of 0.15% - 0.60% were enriched to >95% absolute purity without using tedious (gravity) column chromatography with halogenated solvents.

    Preparative RP-HPLC is an efficient but not very green technique for the final purification of fine chemicals and natural products as large volumes of acetonitrile, methanol and tetrahydrofuran (THF) are consumed. In Chapter 7 it was investigated whether less toxic organic solvents could replace them. As a test case the preparative separation of Ginkgo terpene trilactones (TTLs) was selected. By a two-step chromatographic optimization procedure a 30 min gradient using only water, ethanol, acetone and ethyl acetate was developed, which gave a baseline separation of 480 mg of an injected TTLs mixture. All five individual TTLs were > 95% pure.

    Traditional Chinese Medicines (TCMs) are one of the oldest and most used traditional drugs in the world. Many plants are used for their preparation. An overview of HPLC-related methods such as: multicomponent quantitation, fingerprinting, bioaffinity chromatography and on-flow assays for screening and quality control of TCMs was presented and discussed in Chapter 8.

    The final Chapter 9 discusses the major findings of this work and gives further perspectives.

    Glastuinbouw Waterproof : WP5-onderzoek fase 2 (laboratorium onderzoek)
    Jurgens, R. ; Appelman, W. ; Zijlstra, M. ; Creusen, R. ; Os, E.A. van - \ 2012
    Apeldoorn : TNO Earth, Environmental and Life Sciences - 36
    cultuur zonder grond - glastuinbouw - drainagewater - zuiveren - landbouwkundig onderzoek - kastechniek - nederland - soilless culture - greenhouse horticulture - drainage water - purification - agricultural research - greenhouse technology - netherlands
    Het KRW project glastuinbouw waterproof substraatteelt kent in de uitvoering van werkpakket 5, Zuivering, 3 fases. De eerste fase betreft een studie van mogelijkheden om het spuiwater uit de kas te zuiveren. Resultaat van deze eerste fase is de selectie van 2 technieken die vervolgens in fase 2 op laboratoriumschaal getest worden. Dit rapport beschrijft in hoofdlijnen de werkzaamheden in fase 2. Resultaat van fase 2 is de selectie van techniek(en) die in fase 3 op pilotschaal getest zullen worden.
    Monitoren bedrijven met toepassing van geavanceerde oxidatie als waterzuiveringsmethode - Werkpakket 1 : groeiremming voorkomen
    Maas, A.A. van der; Raaphorst, M.G.M. ; Enthoven, N. ; Blok, C. ; Beerling, E.A.M. ; Os, E.A. van - \ 2012
    Bleiswijk : Wageningen UR Glastuinbouw (Rapporten GTB 1199) - 68
    glastuinbouw - substraten - waterkwaliteit - oxidatie - zuiveren - emissie - plantenontwikkeling - monitoring - drainagewater - greenhouse horticulture - substrates - water quality - oxidation - purification - emission - plant development - monitoring - drainage water
    In het onderzoek zijn 12 bedrijven gemonitord die geavanceerde oxidatie (H2O2 - UV) toepassen voor het zuiveren van drainwater. De vraagstelling was of dit leidde tot het voorkomen van groeiremming en tot het verminderen van waterlozing. De gewassen op de teeltbedrijven waren gerbera, roos, paprika, komkommer en tomaat. De water- en emissiestromen op de bedrijven zijn kwantitatief vastgelegd. De cijfers zijn vergeleken en bediscussieerd tussen de jaren 2010 en 2011 en tussen de bedrijven en vergeleken en met de berekende waarden van een waterstroommodel. Toepassing van geavanceerde oxidatie (AOX) leidde tot meer vertrouwen van de telers in de waterkwaliteit en op een enkel bedrijf tot het daadwerkelijk oplossen van gewasgroei problemen. Projectdeelname zorgde voor een grotere bewustwording van het watermanagement, een stimulans om van elkaar te leren en voor acties om dingen uit te proberen. Mede hierdoor waren de wateremissiecijfers in 2011 lager dan in 2010. In verschillende meetdagen is het effect van doseringsreeksen voor waterstofperoxide en UV op het opheffen van groeiremming en op de afbraak van gewasbeschermingsmiddelen gemeten. Effectieve doseringen voor het voorkomen van groeiremming zijn 15-25 mg/l H 2 O 2 en 100-250 mJ/cm2 UV. Toepassing van AOX geeft mogelijkheden om gewasbeschermingsmiddelen af te breken. De vracht kan aanzienlijk worden verminderd, maar er blijft altijd een kleine resthoeveelheid aan persistente middelen over. Een maximaal effect voor de afbraak van middelen tot beneden de MTR (=maximaal toelaatbaar risico) wordt verkregen met de dosering 25 mg/l H 2 O 2 en 500 mJ/cm2 UV
    Planten en luchtkwaliteit
    Hoffman, M.H.A. - \ 2011
    luchtverontreiniging - zuiveren - planten - fijn stof - openbaar groen - stikstofdioxide - onderzoek - air pollution - purification - plants - particulate matter - public green areas - nitrogen dioxide - research
    Poster met onderzoeksinformatie.
    Naar gesloten waterkringloop op substraatbedrijven: Met hergebruik van drainwater valt nog veel te besparen (interview met Ellen Beerling en Chris Blok)
    Staalduinen, J. van; Beerling, E.A.M. ; Blok, C. - \ 2011
    Onder Glas 8 (2011)1. - p. 4 - 5.
    glastuinbouw - teelt onder bescherming - cultuur zonder grond - hergebruik van water - waterkwaliteit - zuiveren - drainagewater - pesticiden - gesloten systemen - kostenbeheersing - greenhouse horticulture - protected cultivation - soilless culture - water reuse - water quality - purification - drainage water - pesticides - closed systems - cost control
    Het project Glastuinbouw Waterproof zet in op een gesloten waterkringloop op substraatbedrijven. Onderzoek moet daarvoor nieuwe mogelijkheden creëren en doorontwikkelen. De drie sporen waarlangs dat gestalte krijgt zijn het opheffen van groeiremmingen als aanleiding voor spuien, intensiever hergebruik van drainwater door optimalisatie van de bemesting en tenslotte het zuiveren van lozingswater. Intensiever hergebruik van drainwater kan bedrijven duizenden euro’s per jaar besparen.
    Puridrain zuiveringstechnieken voor drainwater
    Jansen, S. ; Stuurman, R. ; PPO Akkerbouw, Groene Ruimte en Vollegrondsgroente, - \ 2010
    zuiveren - drainagesystemen - afvalwaterbehandeling - nadelige gevolgen - landbouwgronden - oppervlaktewater - zuiveringsinstallaties - nitraatuitspoeling - fosfaatuitspoeling - kaderrichtlijn water - purification - drainage systems - waste water treatment - adverse effects - agricultural soils - surface water - purification plants - nitrate leaching - phosphate leaching - water framework directive
    In het project Puridrain ontwikkelen de onderzoeksinstituten Deltares, TNO en PPO samen met lokale belanghebbenden zuiveringstechnologie voor het drainagesysteem. Dit kan een oplossing bieden voor de nadelige effecten van nitraat en fosfaat uit landbouwgebieden op het oppervlaktewater.
    Effectgerichte aanpak verwijdering P uit bodem- en slootwater duinzandgrond
    Belder, P. ; Kool, S.A.M. de; Jansen, S. ; Stuurman, R. ; Koopmans, G.F. ; Chardon, W.J. - \ 2010
    BloembollenVisie 2010 (2010)207. - ISSN 1571-5558 - p. 20 - 20.
    zuiveren - fosfaat - verwijdering - eu regelingen - tests - zuiveringsinstallaties - oppervlaktewaterkwaliteit - waterzuivering - purification - phosphate - removal - eu regulations - tests - purification plants - surface water quality - water treatment
    Op bloembollenpercelen bij Egmond a/d Hoef worden twee zuiveringsmethoden getest om fosfaat te verwijderen uit bodem en slootwater. Het doel is het water te zuiveren van fosfaat om daarmee te voldoen aan de Europese Regelgeving voor de kwaliteit van oppervlaktewater.
    Maatregelen ter vermindering van fijnstofemissie uit de pluimveehouderij: indicatieve evaluatie van biofiltratie als potentiële fijnstofreductietechniek = Measures to reduce fine dust emission from poultry: indicative evaluation of biofiltration as potential fine dust reduction technique
    Winkel, A. ; Ogink, N. ; Hol, J.M.G. - \ 2010
    Lelystad : Wageningen UR Livestock Research (Rapport / Wageningen UR Livestock Research 313) - 13
    biologische filtratie - filtratie - emissie - pluimvee - pluimveehouderij - zuiveren - innovaties - landbouwtechniek - luchtkwaliteit - fijn stof - biological filtration - filtration - emission - poultry - poultry farming - purification - innovations - agricultural engineering - air quality - particulate matter
    In this study biofiltration is indicatively evaluated for its potential to remove fine dust from exhaust air of poultry houses. From this study it is concluded that biofiltration can be effective and applicable.
    Zuivering recirculatiewater roos
    Maas, A.A. van der; Os, E.A. van; Blok, C. ; Meijer, R.J.M. - \ 2009
    oppervlaktewater - zuiveren - waterzuivering - irrigatie - gewasbescherming - pesticiden - afbraak (plantenziektekundig) - rozen - hergebruik van water - sierteelt - kastechniek - surface water - purification - water treatment - irrigation - plant protection - pesticides - breakdown - roses - water reuse - ornamental horticulture - greenhouse technology
    Powerpointpresentatie over de problematiek van teveel emissie naar het oppervlaktewater en het spuien van recirculatiewater vanwege groeiremming en zoutophoping
    Kelderlucht afzuigen uit melkveestallen lijkt perspectiefvol
    Dooren, H.J.C. van; Smits, M.C.J. - \ 2009
    V-focus 6 (2009)3. - ISSN 1574-1575 - p. 14 - 16.
    melkveehouderij - huisvesting van koeien - ammoniak - kelders - zuiveren - ammoniakemissie - dairy farming - cow housing - ammonia - cellars - purification - ammonia emission
    Om de ammoniakemissie uit melkveestallen te verminderen is tot nu toe vooral aandacht besteed aan de vloeren in stallen. Voordeel hiervan is dat de vorming van ammoniak bij de bron wordt aangepakt. Nadeel is het spanningsveld tussen beloopbaarheid en emissievermindering. ASG onderzoekt daarom de mogelijkheden van het aanzuigen en zuiveren van kelderlucht. Modelberekeningen laten zien dat dit perspectiefvol is
    Groeiresponstest voor recirculatiewater - Stap 1: Opzet van een Biotoets
    Blok, C. - \ 2008
    irrigatie - irrigatiewater - irrigatieuitrusting - zuiveren - reinigers - scheiding - wassen (activiteit) - biotesten - voedingsstoffen - voedingsoplossingen - groeivertragers - plantengroeiregulatoren - hergebruik van water - irrigation - irrigation water - irrigation equipment - purification - scrubbers - separation - washing - bioassays - nutrients - nutrient solutions - growth retardants - plant growth regulators - water reuse
    De methoden worden gecombineerd toegepast, waarbij methode A als voorselectie wordt gebruikt. Hiermee worden voedingsoplossingen getest bij binnenkomst. Als er een verdachte voedingsoplossing gevonden wordt, starten de testen B en C. Tegen het einde van de testen B en C wordt test A herhaald om na te gaan of de groeiremming op het zelfde niveau aanwezig blijft, of dat de groeiremming afneemt in de tijd (en dus de metingen met methode B en C anders beoordeeld moeten worden
    Supramolecular polymers in inhomogeneous systems
    Zweistra, H.J.A. - \ 2007
    Wageningen University. Promotor(en): Gerard Fleer, co-promotor(en): N.A.M. Besseling. - [S.l.] : S.n. - ISBN 9789085045526 - 78
    polymeren - adsorptie - desorptie - fractionering - zuiveren - fysicochemische eigenschappen - supramoleculaire chemie - polymers - adsorption - desorption - fractionation - purification - physicochemical properties - supramolecular chemistry
    This thesis describes theoretical results of supramolecular polymers in inhomogeneous systems. Supramolecular polymers are linear assemblies of which the monomers are joined by reversible bonds. Many types of supramolecular polymers have been synthesized in recent years. Moreover, there are numerous compounds in nature which exhibit similar behavior. Simulations of coarse-grained models of supramolecular polymers yielded new insights into the properties of supramolecular polymers in inhomogeneous systems.

    Self-consistent-field calculations on the quasi-chemical level of approximation were used to obtain information about adsorbed supramolecular polymers (chapters 2 and 3). In chapter 2, we describe the effect of adsorption on the mean chain length of supramolecular polymers. It is generally agreed that <N> always increases with concentration in homogeneous systems. Adsorbed supramolecular polymers exhibit qualitatively different if the adsorption energy per segment is strong enough.

    A very interesting non-monotonical concentration dependence of <N> of adsorbed supramolecular polymers was found. In other words: there exists a regime where <N> decreases with increasing concentration.

    This has never been shown before. The physical background is a change of the structure of the adsorbed layer: the adsorbed layer changes from flat to fluffy when the monomer concentration is increased.

    Chapter 3 also deals with adsorbing supramolecular polymers, but focuses on the adsorbed amount. This chapter describes how the model parameters influence the shape and position of the adsorption isotherms. Moreover a comparison is made with the adsorption isotherms of macromolecular polymers. It is found that supramolecular polymers adsorb at relatively high volume fractions and the filling of the surface occurs within a narrow range of concentrations. As a result, supramolecular polymers can be desorbed from the surface by diluting the surrounding solution. Macromolecular polymers usually cannot be desorbed in this manner. This has important implications for the use of supramolecular polymers as surface-active agents since the usefulness increases when they can be removed from the surface. Cleaning the surface requires little effort: diluting the surrounding solution is sufficient.

    Chapters 4 and 5 describe a different type of inhomogenous systems: phase-separated systems. The results of these chapters were obtained byMonte Carlosimulations. In chapter 4, we introduce the ``Helmholtz ensemble'', a formalism to calculate the compositions of two coexisting liquid phases by aMonte Carlosimulation. The general idea of this method is to use three simulation boxes (or more, if more than two coexisting phases are present). The only perturbations that are needed are molecule swaps and changes in the orientation of the molecules. Molecule displacements are only needed if a continuum model is used. Unlike the well-known Gibbs ensemble method, volume moves are unnecessary. As a consequence, an interface is formed in one of the simulation boxes. The compositions of the simulation boxes that contain homogeneous phases are used to obtain the compositions of the coexisting liquids.

    For a succesful simulation it is required that a flat interface is formed. Several tests are proposed to check the net curvature of the interface. If a curved interface is formed, then the simulation should be repeated with a different starting composition.

    The restraint that a flat interface should be formed therefore does not affect the range of applicability of the technique. The Helmholtz ensemble method is especially useful for liquids that are modeled on a lattice, since no volume moves are necessary as is the case in the (related) Gibbs ensemble method. It is shown that the Helmholtz ensemble reproduces the phase behavior of the 3D Ising problem very accurately.

    Supramolecular polymer systems are often polluted by monofunctional contaminants which are very difficult to remove. A new purification method aimed specifically at removing monofunctional contaminants is put forward in chapter 5. The idea is to decrease the solvent quality (e.g., by cooling) and to let the supramolecular polymer solution separate into two phases. It is to be expected that the phase that is poor in polymer has a relatively high concentration of monofunctional monomers. Therefore the solution can be purified by discarding the dilute phase.

    In chapter 5, the effectivity of the proposed purification method is investigated by means ofMonte Carlosimulations. The compositions of the concentrated and the dilute coexisting phases are calculated by means of the Helmholtz ensemble method. The entire phase diagram of bifunctional monomers, monofunctional molecules and solvent can be constructed. The efficiency of the several purification steps could be calculated directly from the phase diagram. Moreover, a parameterization of the phase diagram can be found. For purification purposes, the phase diagram can be described by three parameters. Only two simulations are needed to obtain these parameters. It therefore becomes feasible to predict the effectivity of the purification method for a wide range of linking energies. Extrapolations show that the vast majority of monofunctional contaminants can be removed by a single purification step if the conditions are well chosen. Several recommendations for experimental systems are also provided.
    Stadsbomen voor een goede luchtkwaliteit
    Tonneijck, A.E.G. ; Kuypers, V.H.M. - \ 2006
    Bomennieuws 31 (2006)1. - ISSN 0166-784X - p. 8 - 10.
    bomen - straatbomen - stadsparken - stedelijke gebieden - luchtkwaliteit - luchtverontreiniging - zuiveren - ozon - stikstofdioxide - organische stof - openbaar groen - fijn stof - trees - street trees - urban parks - urban areas - air quality - air pollution - purification - ozone - nitrogen dioxide - organic matter - public green areas - particulate matter
    Aangegeven wordt welke bomen geschikt zijn om de ozonniveaus te verminderen; welke de stikstofdioxide goed kunnen opnemen; welke zeer veel of weinig vluchtige organische stoffen kunnen emitteren en welke het fijn stof kunnen vastleggen
    Benchmarking procedure for full-scale activated sludge plants
    Abusam, A. ; Keesman, K.J. ; Spanjers, H. ; Straten, G. van - \ 2004
    Control Engineering Practice 12 (2004)3. - ISSN 0967-0661 - p. 315 - 322.
    simulatie - identificatie - controle - afvalwater - oxidatiesloten - prestatie-indexen - prestatieniveau - afvalwaterbehandeling - zuiveren - planten - simulation - identification - control - waste water - oxidation ditches - performance indexes - performance - waste water treatment - purification - plants - oxidation ditch benchmark - waste-water - parameters
    To enhance development and acceptance of new control strategies, a standard simulation benchmarking methodology to evaluate the performance of wastewater treatment plants has recently been proposed. The proposed methodology is, however, for a typical plant and that works under typical loading and environmental conditions. Thus, benchmarking a full-scale plant working under different situations is still a problem that needs to be solved. This paper proposes a data based approach to benchmark any specific full-scale activated sludge plant used for carbon and nitrogen removal and using real design, operational and performance data. The advantage of the proposed approach over the "one-typical-plant" approach, is that it takes into account the very specific design and operational characteristics of the plant that will be benchmarked. A real-world illustrative example is also presented in this paper
    To enhance development and acceptance of new control strategies, a standard simulation benchmarking methodology to evaluate the performance of wastewater treatment plants has recently been proposed. The proposed methodology is, however, for a typical plant and that works under typical loading and environmental conditions. Thus, benchmarking a full-scale plant working under different situations is still a problem that needs to be solved. This paper proposes a data based approach to benchmark any specific full-scale activated sludge plant used for carbon and nitrogen removal and using real design, operational and performance data. The advantage of the proposed approach over the "one-typical-plant" approach, is that it takes into account the very specific design and operational characteristics of the plant that will be benchmarked. A real-world illustrative example is also presented in this paper. (C) 2003 Elsevier Science Ltd. All rights reserved.
    Fytoremediëring; experimenteel onderzoek naar het gebruik van planten voor kwaliteitsverbetering van verontreinigde grond en baggerspecie
    Japenga, J. ; Bouwman, L.A. ; Harmsen, J. ; Römkens, P.F.A.M. ; Draaisma, C. ; Zweers, A.J. - \ 2000
    Wageningen [etc.] : Programma Geïntegreerd Bodemonderzoek [etc.] (Rapporten / Programma Geïntegreerd Bodemonderzoek 31) - ISBN 9789073270466 - 61
    zuiveren - planten - bodem - volksgezondheidsbevordering - bodemverontreiniging - sediment - zware metalen - verontreinigende stoffen - decontaminatie - nederland - bagger - bioremediëring - biologische behandeling - purification - plants - soil - sanitation - soil pollution - sediment - heavy metals - pollutants - decontamination - netherlands - dredgings - bioremediation - biological treatment
    Fytoremediëring: klaar voor gebruik in Nederland?
    Japenga, J. - \ 1999
    Wageningen : Programma Geïntegreerd Bodemonderzoek (Rapporten Programma Geïntegreerd Bodemonderzoek 24) - ISBN 9789073270398 - 34
    zuiveren - planten - volksgezondheidsbevordering - bodemverontreiniging - afvalwaterbehandeling - zware metalen - verontreinigende stoffen - nederland - decontaminatie - bioremediëring - waterbodems - purification - plants - sanitation - soil pollution - waste water treatment - heavy metals - pollutants - netherlands - decontamination - bioremediation - water bottoms
    Poreuze polymeren scheiden selectiver
    Zondervan, C. - \ 1999
    Voedingsmiddelentechnologie 32 (1999)14/15. - ISSN 0042-7934 - p. 31 - 32.
    polymeren - organische verbindingen - distillatie - zuiveren - voedselindustrie - voedseltechnologie - verwerking - polymers - organic compounds - distillation - purification - food industry - food technology - processing
    MIP's (molecular imprinted polymers) zijn polymeren die als scheidingsmedium worden gebruikt voor de voedingsindustrie. Ze bieden duidelijke voordelen ten opzichte van conventionele technieken. In een tabel zijn toepassingen weergegeven
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