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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    Supramolecular networks of telechelic polymers
    Bohdan, M.A. - \ 2016
    Wageningen University. Promotor(en): Jasper van der Gucht, co-promotor(en): Joris Sprakel. - Wageningen : Wageningen University - ISBN 9789462578678 - 117
    supramolecular chemistry - networks - polymerization - gels - mechanical properties - separation technology - rheology - supramoleculaire chemie - netwerken - polymerisatie - gels - mechanische eigenschappen - scheidingstechnologie - reologie

    This thesis focuses on the fundamental understanding of phenomena associated with the gelation of end-functionalized polymers and the dynamic processes occurring inside of the gel network. To address particular questions we use two types of telechelic polymers, in which the assembly occurs due to the solvophobic interactions and due to the metal-ligand coordination, respectively. In this research we employ a number of methods, mostly rheology and light scattering.

    In Chapter 2 we revealed new insights into the complex microscopic dynamics of transient networks, assembled by hydrophobic forces. Using light scattering experiments we show how these materials exhibit complex multimodal relaxation spectra. To shed light on the nature of such relaxation processes we systematically changed the network architecture by gradually reducing the network connectivity while keeping the polymer concentration constant. This strategy allows us to disentangle the roles of concentration and connectivity on the dynamic modes of these systems.

    In Chapters 3 and Chapter 4 we experimentally explored the pathways of network formation from telechelic polymers association by means of metal-ligand complexation. Interestingly, while some networks exhibit near-ideal Maxwellian behavior, as expected for transient networks, we find certain cases where we observe scale-free critical mechanics. To date this latter behavior was only identified close to a covalent percolation transition. The critical behavior observed for these end-functional self-assembled polymer networks, however, is robust to changes in concentration, temperature and crosslinking degree. Our studies show that such a self-organized and robust critical state is the results of arrested phase separation that kinetically traps the network-forming system at its percolation point. The system thus remains trapped in a critical state resulting in robust power-law scaling of shear and relaxation moduli. We also show how this state depends sensitively on the relaxation kinetics of the nodes by demonstrating an intermediate case where initial critical behavior slowly relaxes over the course of several days to the ideal linear Maxwell case. With our research we highlight the complex pathway where self-assembling systems reach their equilibrium ground state, involving persistent and long-lived kinetically arrested states which give rise to unusual mechanics and highly heterogeneous spinodal structures.

    Chapter 5 brought us towards more applicable materials where we develop a highly tunable composite network based on orthogonal supramolecular interactions. For such a design we generate multivalent nanoparticle tectons, which are subsequently linked together into network structures, using metal-coordination interactions. Materials built this way are highly tunable with moduli and viscosities spanning many orders of magnitude.

    In the remainder of this chapter, we focus on some unresolved and outstanding questions regarding the physical chemistry and properties of supramolecular networks and we will discuss some preliminary data obtained in our efforts to resolve them.

    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.
    Biorefinery : recovery of valuable biomolecules
    Eppink, M.H.M. - \ 2015
    Wageningen : Wageningen University - ISBN 9789462573789 - 28
    biorefinery - recovery - biomass - biofuels - separation technology - biomass conversion - biomass cascading - biobased economy - bioraffinage - terugwinning - biomassa - biobrandstoffen - scheidingstechnologie - biomassaconversie - biomassa cascadering - biobased economy
    Inaugural speech Wageningen University, 23 April 2015
    Nascheiden van verpakkingsglas uit gemengd huishoudelijk restafval : rapportage van een technische haalbaarheidsstudie
    Thoden van Velzen, E.U. - \ 2015
    Wageningen : Wageningen UR - Food & Biobased Research - ISBN 9789462575301 - 29
    recycling - afvalbeheer - scheiding - scheidingstechnologie - glas - haalbaarheidsstudies - afvalverwerking - recycling - waste management - separation - separation technology - glass - feasibility studies - waste treatment
    Het recyclingpercentage voor verpakkingsglas is voor 2012 door Nedvang vastgesteld op 71% en voor 2013 op 79%, terwijl de Nederlandse overheid streeft naar een percentage van 90%. [Nedvang 2012 en Nedvang 2013] Ten einde dit percentage te verhogen, is Nedvang begonnen met een publiciteitscampagne “Glas in ‘t Bakkie” en heeft zij opdracht gegeven voor deze verkennende studie naar de mogelijkheden om glas uit huisvuil na te scheiden.
    Biorefinery: refining tomorrow
    Eppink, M.H.M. - \ 2015
    Wageningen UR
    bioraffinage - biomassaconversie - biobased economy - scheidingstechnologie - onderzoek - onderzoeksinstituten - biorefinery - biomass conversion - biobased economy - separation technology - research - research institutes
    Wageningen UR is one of the world's leading institutes in Circular Biobased Economy R&D. We see biorefinery as the key enabler of this sustainable, future economy. Wageningen UR offers a toolbox full of technologies and expertise for biorefinery. Technologies related to pretreatment, (mild) separation and chemical- or bioconversion. And expertise related to designing sustainable biorefinery value chains.
    Prof. Michel Eppink over raffinage van algen als duurzame weg voor vervanging fossiele grondstoffen
    Eppink, M.H.M. - \ 2015
    Wageningen UR
    bioraffinage - algen - bioproceskunde - scheidingstechnologie - onderzoek - biobased economy - biorefinery - algae - bioprocess engineering - separation technology - research
    Algen vormen een belangrijke bron voor onze grond- en fijnstoffen voor de toekomst. Daarmee ligt een groene economie die minder afhankelijk is van fossiele grondstoffen in het verschiet. Dat is de overtuiging van prof.dr. Michel Eppink bij de aanvaarding van het ambt van buitengewoon hoogleraar ‘Biorefinery: Recovery of valuable biomolecules’ aan de Wageningen University op 23 april 2015. In zijn onderzoek verkent hij de technologische raffinagewegen voor functionele biomoleculen die leiden naar groene alternatieven voor voedsel, biomaterialen, gezondheid en energie.
    Deterministic ratchets for larger-scale separation of suspensions
    Lubbersen, Y.S. - \ 2014
    Wageningen University. Promotor(en): Remko Boom, co-promotor(en): Maarten Schutyser. - Wageningen : Wageningen University - ISBN 9789461739155 - 136
    suspensies - scheiding - scheidingstechnologie - stroming - microfluidics - suspensions - separation - separation technology - flow - microfluidics

    Solid-liquid separation is a very common process operation in the chemical and food industry. Current technologies, such as membrane separation, consume large amounts of energy and water and often suffer from fouling issues. A novel, promising separation principle was identified for possible large scale application. This principle has been studied in microfluidic systems and employs so-called deterministic ratchets. Ratchet separationrelies on particle interactions with a series of obstacle arrays positioned in a flow field. Particles above a critical size are forced from their streamlines and migrate into another direction than the main flow direction. The objective of this thesis was to understand the mechanisms relevant for suspension separation with deterministic ratchets and to develop guidelines for the design of this technology at a larger scale. An up-scaled device was developed to investigate separation of model suspensions with larger particles (~101 - ~102 µm). Experiments at increasing volume particle fractions yielded final particle concentrations up to 12 v/v% without particle accumulation. The separation efficiency was discovered strongly influenced by the hydrodynamic conditions. High speed camera images and fluid flow simulations provided insight that a vortex pair developed behind obstacles and that inertial forces improved displacement behavior of particles. Different designs suitable for larger-scale application were evaluated. A mirrored (axisymmetric) obstacle array was found more effective in displacement of particles. Different designs were identified for cleaning as well as concentration applications. Finally, a simple, but effective sparse ratchet design is proposed by replacing full obstacle arrays by selected single lines of obstacles. The degree of sparseness is found a design parameter for accommodating differences in concentrations. Although the application of the principle is still challenging for smaller particle diameters (~100 - ~101 µm), this study shows that the principle of deterministic ratchet separation holds potential for larger-scale separation of suspensions.

    Numerical and experimental design of ultrasonic particle filters for water treatment
    Cappon, H.J. - \ 2014
    Wageningen University. Promotor(en): Gerrit van Straten, co-promotor(en): Karel Keesman. - Wageningen : Wageningen University - ISBN 9789461738592 - 202
    waterzuivering - terugwinning - ultrasone behandeling - geluidsleer - scheidingstechnologie - wiskundige modellen - water treatment - recovery - ultrasonic treatment - acoustics - separation technology - mathematical models

    Due to limited water resources available in the world and the ever growing world population, there is an increasing need for water recycling, recovery and multi-sourcing strategies. One of the new physical process technologies being investigated for water purification and/or constituent recycling is ultrasonic particle separation. This technology is especially interesting for harvesting particles with an almost neutral buoyancy. An ultrasonic particle filter does not use a filter medium, like sand or a membrane, but filters on a basis of acoustic forces in ultrasonic standing waves, which are able to immobilise particles in flowing water.

    The objective of this study was to develop an ultrasonic separation device for particle recovery and water purification. This separator should be fit for industrial applications treating cubic meters of water per hour. In order to reach this objective, a combined numerical-experimental approach was proposed to develop a model-based design of an ultrasonic separator. Each individual component of this separator was modelled using a finite element (FE) approach. The numerical simulations were continuously cross-checked with experiments in order to find the best solution possible.

    In this thesis, the source of the acoustic wave is a piezoelectric transducer attached to a glass matching layer of the acoustic cavity, which couples the transducer to the fluid inside the cavity, forming an acoustic resonator/separator. In order to obtain a valid FE transducer model, a limited set of material parameters for the piezoelectric transducer were obtained from the manufacturer, thus preserving prior physical knowledge to a large extent. The remaining unknown parameters were estimated from impedance (admittance) analysis combined with a numerical optimisation routine using 2D and 3D FE models. Thus, a full set of physically interpretable material parameters was obtained. The approach provided adequate accuracy of the estimates of the material parameters, near 1%.

    A similar approach as used for the transducer was applied to an existing ultrasonic separator, again preserving known physical parameters and estimating the remaining unknown or less certain parameters. The results showed that the approach led to a fully calibrated 2D model of the emptyseparator, which was subsequently validated with experiments on a filledseparator chamber. The large sensitivity of the separator to small variations indicated that either such system should be made and operated within tight specifications to obtain the required performance. Alternatively, the operation of the system should be adaptable to cope with a slightly off-spec system, requiring a feedback controller.

    Starting from a fully characterised existing separator with all material parameters found so far, the subsequent step was the actual design of, or extrapolation to, a new separator. A basic design for an industrial scale acoustic separator was obtained based on simulated flow characteristics inside the separation chamber, on acoustic analysis within the chamber and simulated particle trajectories combining these two analyses. Results showed that positioning the piezoelectric transducer surfaces perpendicular to the flow direction and introducing chamber partitioning with multiple flow lanes to enforce laminar flow, resulted in high particle retention. The average particle displacement was found to be related to acoustic pressure in the fluid, showing large retention at peak pressures above 1 MPa or average pressures above 0.5 MPa for small (10 µm), near buoyant (1100 kg/m3) particles at a flow speed of 3.5 cm/s, thus providing comprehensible criteria for subsequent optimisation.

    This basic ultrasonic standing wave separator design was optimised with respect to separation efficiency, throughput and energy consumption. The methodology, using a design of experiments (DOE) approach, showed that it was possible to improve system performance based on acoustic pressure profiles, separation efficiency and flow robustness. Compromising the energy consumption and aiming for maximum separation efficiency with a laminar stable flow up to 5 ml/s resulted in a separator with inner dimensions of 70 mm length, 20 mm width and 28.5 mm height using two transducers perpendicular to the direction of flow and three parallel flow lanes with 9.5 mm height each. The lowest power consumption (with an average of 30 W) with adequate pressure to trap the particles was obtained when it was not operated at the main eigenfrequency.

    Finally, this new ultrasonic particle filter was built and evaluated experimentally. The particle filter was a three channel device, manufactured from glass with four in/outlet ports made of ABS. It was operated in sequenced batch mode and the separation efficiency was determined at three flow rates ranging from 1 to 3 ml/s, using a stock suspension of insoluble potato starch of 1 g/l (1000 ppm). Concentrations of stock, filtrate and concentrate were measured using a turbidity meter and significant effects of acoustic particle concentration were measured at both outlets of the process. The maximum filtration efficiency and concentration efficiency were 54% and 76%, respectively. The performance found was lower than the 100% that was expected for 10 µm particles from the model based design study. The deviation in performance is mainly a result of (i) the pulsation of the feed pump, (ii) differences between the model and the actual prototype, (iii) the limited power supply of only 10 W used and (iv) (too) small particles, below 10 µm, occurring in the starch suspension.

    The best dimensions for an acoustic separator were obtained, but thus far operational characteristics were not yet studied. Operational characterisation and optimisation is the last step in the process of obtaining the best possible solution for operation. With the aim to achieve a high separation efficiency with minimal energy consumption, a model-based open-loop switching control strategy was designed for the commercially available BioSep, using a numerical-experimental approach. Firstly, a dynamic BioSep model structure was derived from mass balances and its system properties were studied. Then, the unknown system parameters were estimated from steady state and dynamic experimental data and subsequently, the switching times of the control input were determined. The model with switching control outputs was then validated by experiments. Finally, the control strategy was implemented in an experimental setup and tested using suspended potato starch. Results showed that the optimal control strategy reached a mass separation efficiency of 96%, which was an improvement of 4% with respect to the initial settings, while using less energy.

    Concluding, a stepwise numerical-experimental approach to acoustic separator design was presented in this study. The minimum power required was estimated to be 22-34 W, resulting in an average electric energy consumption of 1-1.5 kWh/m3. The practical concentration efficiency obtained was 76% at a flow rate of 2 ml/s and a filtration efficiency of 54% at 1 ml/s with a real power input of 8.8 W. An optimal open loop control strategy showed that it is possible to operate an acoustic separator with high separation efficiency using the least power possible. Parallelisation, instead of enlarging the separator, is recommended to scale this system up to larger, industrial flows.

    Oogsten van micro-algen : inventarisatie oogstmethoden en praktijkresultaten
    Schoot, J.R. van der; Schipperus, R. ; Kootstra, A.M.J. - \ 2013
    Lelystad : PPO AGV (PPO rapport 566) - 17
    algenteelt - oogsten - technieken - scheidingstechnologie - technologie - biomassa productie - biobased economy - algae culture - harvesting - techniques - separation technology - technology - biomass production - biobased economy
    In dit rapport worden de resultaten beschreven van een inventarisatie van verschillende methoden voor het oogsten van micro-algen. Veel van de besproken methoden zijn erop gericht om op een goedkope en min of meer passieve manier een voorconcentratie van de algensuspensie te bewerkstelligen, om zo uiteindelijk door een kleiner te verwerken volume te besparen op de actieve concentratiestap, bijvoorbeeld de centrifuge. Bij de inventarisatie is gebruik gemaakt van wetenschappelijke literatuur en ook van een aantal beschikbare rapporten van praktijkopstellingen.
    Emissies uit een vleesvarkensstal voorzien van een V-vormige mestband voor het gescheiden afvoeren van mest en urine = Emissions from a housing system for fattening pigs with a V-shaped manure belt for separated removal of faeces and urine
    Ellen, H.H. ; Hol, J.M.G. ; Mosquera, J. ; Aarnink, A.J.A. - \ 2013
    Lelystad : Wageningen UR Livestock Research (Rapport / Wageningen UR Livestock Research 620) - 37
    varkenshouderij - vleesproductie - vleesvee - varkensmest - drijfmest - scheidingstechnologie - urine - emissie - reductie - stankemissie - fijn stof - methaan - distikstofmonoxide - ammoniakemissie - mestverwerking - meting - pig farming - meat production - beef cattle - pig manure - slurries - separation technology - urine - emission - reduction - odour emission - particulate matter - methane - nitrous oxide - ammonia emission - manure treatment - measurement
    This study reports the emissions of ammonia, odour, fine dust (PM10 and PM2.5), methane and nitrous oxide from an animal house for fattening pigs provided with V-shaped manure belts for separated removal of faeces and urine (the Kempfarm system).
    'Door lozingenbesluit mogen we minder tot niets lozen' (interview met Bram van der Maas)
    Arkesteijn, M. ; Maas, A.A. van der - \ 2013
    Onder Glas 10 (2013)1. - p. 6 - 7.
    glastuinbouw - plantmateriaal - waterkwaliteit - irrigatie - waterzuivering - emissie - pesticiden - micro-organismen - scheidingstechnologie - groenten - greenhouse horticulture - planting stock - water quality - irrigation - water treatment - emission - pesticides - microorganisms - separation technology - vegetables
    De waterkwaliteitseisen voor gietwater in de opkweek zijn hoog. De planten vormen immers de basis voor de vervolgteelten. Opkweekbedrijven moeten bovendien aan de emissiedoelstellingen van de kaderrichtlijn water in 2027 voldoen: een nulemissie van nitraat en fosfaat. Daarom is een goede zuiveringstechniek voor zowel micro-organismen als gewasbeschermingsmiddelen nodig.
    Gebruik van de dunne en dikke fractie van rundmest getest op Koeien & Kansen-melkveebedrijven : vooronderzoek
    Verloop, K. ; Hilhorst, G.J. - \ 2011
    Lelystad : Wageningen UR Livestock Research (Rapport / Koeien & Kansen nr. 62) - 47
    melkveehouderij - dierlijke meststoffen - mestverwerking - scheiding - scheidingstechnologie - drijfmest - stikstof - fosfaat - dairy farming - animal manures - manure treatment - separation - separation technology - slurries - nitrogen - phosphate
    De studie naar mestscheiding op vijf ‘Koeien & Kansen-bedrijven’ heeft tot doel om te onderzoeken wat de landbouwkundige en milieukundige effecten zijn van mestscheiding op bedrijfsschaal. Dit rapport is een voorverkenning van onderzoek naar gebruik van de dunne en dikke fractie als meststof op melkveebedrijven. Het heeft tot doel het ontwerp van een kader, het oriënteren op de mogelijkheden (wat is realiseerbaar?), het vinden van een werkwijze voor het maken van bemestingsplannen en het aanduiden van kritische en dus te monitoren punten.
    Gebruik van de dunne en dikke fractie van rundmest getest op Koeien & Kansen-melkveebedrijven : scheidingsresultaten 2010 en 2011
    Verloop, K. ; Hilhorst, G.J. - \ 2011
    Lelystad : Wageningen UR Livestock Research (Rapport / Plant Research International nr. 423) - 39
    melkveehouderij - dierlijke meststoffen - mestverwerking - scheiding - scheidingstechnologie - drijfmest - stikstof - fosfaat - dairy farming - animal manures - manure treatment - separation - separation technology - slurries - nitrogen - phosphate
    Dit rapport gaat over de scheidingsresultaten van 2010 en 2011, waargenomen in het onderzoek naar gebruik van de dunne en dikke fractie als meststof op melkveebedrijven. Het onderzoek wordt uitgevoerd op 5 ‘Koeien & Kansen testbedrijven’, te weten de bedrijven: Dekker (Zeewolde), De Kleijne (Landhorst), Pijnenborg-Van Kempen (Ysselsteyn), Post (Nieuweroord) en Van Wijk (Waardenburg). De scheiding wordt in de meeste gevallen uitgevoerd met een schroefpers en een centrifuge. Dit rapport geeft een overzicht van de scheidingsresultaten en beschrijft de verschillen met de verwachte resultaten zoals weergegeven in Verloop et al., 2011. Bovendien geeft het de ervaringen van melkveehouders met mestscheiding op bedrijfsschaal weer.
    Stikstofwerking in dunne en dikke mest wel snel genoeg?
    Verloop, K. ; Hilhorst, G.J. - \ 2011
    V-focus 8 (2011)3. - ISSN 1574-1575 - p. 26 - 26.
    melkveehouderij - dierlijke meststoffen - mestverwerking - scheidingstechnologie - stikstof - opname (uptake) - co-vergisting - dairy farming - animal manures - manure treatment - separation technology - nitrogen - uptake - co-fermentation
    Stel dat een gewas wordt bemest met stikstof (N) uit dierlijke mest en ter vergelijk ook met kunstmest-N. Dan zal van de kunstmest-N het meest worden teruggewonnen in het geoogste gewas. Dat komt doordat N in kunstmest voorkomt in minerale vorm: dit is snel opneembaar. In dierlijke mest, daarentegen, is ongeveer de helft van de N organisch gebonden. Die komt langzaam vrij. Koeien & Kansen zoekt naar manieren om de N in dierlijke mest meer als kunstmest te laten werken. Een mogelijkheid is het toepassen van mestscheiding. De resultaten van veldproeven op Koeien & Kansen-bedrijf Van Wijk en op proefbedrijf de Marke zijn bemoedigend.
    Haalbaarheidsstudie terugwinning van mestnutriënten : Fase 1: Processchema en nutriëntenstromen = Feasibility study on nutrient recovery from animal manure : Phase 1: Process scheme and nutrient flows
    Starmans, D.A.J. ; Melse, R.W. ; Sanders, J.P.M. - \ 2011
    Wageningen : Wageningen UR Livestock Research (Rapport / Wageningen UR Livestock Research 446) - 21
    rundveehouderij - varkenshouderij - varkensmest - rundveemest - dierlijke meststoffen - mestverwerking - nutriëntenstromen - co-vergisting - scheidingstechnologie - haalbaarheidsstudies - digestaat - biobased economy - cattle husbandry - pig farming - pig manure - cattle manure - animal manures - manure treatment - nutrient flows - co-fermentation - separation technology - feasibility studies - digestate - biobased economy
    A process scheme for a new manure treatment system for pig and cattle manure was formulated which aims to produce manure nutrient flows with added value. The basic process behind the treatment system is fermentation of manure, which is preceded by both stripping ammonia and chemical digestion of the organic solids. The fermented manure is separated in a thin and a thick phase, which is further treated.
    Emissies van lachgas, methaan en ammoniak uit mest na scheiding = Emissions of nitrous oxide, methane and ammonia from manure after separation
    Mosquera Losada, J. ; Schils, R.L.M. ; Groenestein, C.M. ; Hoeksma, P. ; Velthof, G.L. ; Hummelink, E.W.J. - \ 2010
    Lelystad : Wageningen UR Livestock Research (Rapport / Wageningen UR Livestock Research 427) - 38
    melkveehouderij - varkenshouderij - drijfmest - scheidingstechnologie - ammoniakemissie - broeikasgassen - luchtverontreinigende stoffen - dairy farming - pig farming - slurries - separation technology - ammonia emission - greenhouse gases - air pollutants
    It is expected that separation of animal slurry in the Netherlands in coming years will increase as a result of the manure legislation. Against this background the effect of slurry separation on the emission of greenhouse gasses and ammonia during storage and after field application was studied. It is expected that due to slurry separation in the Netherlands in 2020 the greenhouse gas emissions will be slightly lower than the current level. Slurry separation has no effect on the emission of ammonia.
    Perspectief mestscheiding op melkveebedrijven = Economic perspectives of manure separation on dairy farms
    Evers, A.G. ; Haan, M.H.A. de; Buisonje, F.E. de; Verloop, J. - \ 2010
    Lelystad [etc.] : Wageningen UR Livestock Research [etc.] (Rapport / Wageningen UR Livestock Research 421)
    melkveebedrijven - mestverwerking - scheidingstechnologie - agrarische bedrijfsvoering - economische evaluatie - bedrijfsresultaten in de landbouw - dairy farms - manure treatment - separation technology - farm management - economic evaluation - farm results
    In this study it was investigated whether manure separation can be economically attractive to a dairy farm. Various separator systems were considered. It was also investigated whether there were sufficient removal possibilities for the solid fraction
    Energiearme scheidingstechnieken
    Roller, E. te; Sanders, J.P.M. - \ 2010
    Fluids Processing Benelux 2010 (2010)4. - ISSN 1874-7914 - p. 14 - 16.
    biobased economy - energiebesparing - bioraffinage - chemische industrie - biomassa cascadering - scheidingstechnologie - energy saving - biorefinery - chemical industry - biomass cascading - separation technology
    Met bioraffinage zoveel mogelijk waardevolle stoffen uit biogrondstoffen halen. Dat klinkt mooi, maar hoe haal je al die waardevolle stoffen uit de soep? Kost dat niet vreselijk veel energie? Professor Johan Sanders uit Wageningen werkt met zijn team aan nieuwe energiearme scheidingstechnieken en gelooft in de toekomst daarvan.
    Scheiden van rundveemest met decanter van GEA Westfalia Separator : testresultaten van scheiden met vergiste en onvergiste rundveemest
    Hilhorst, G.J. ; Verloop, K. - \ 2010
    Lelystad : Wageningen UR Livestock Research (Koeien & kansen 57) - 14
    mestverwerking - scheidingstechnologie - rendement - proefbedrijven - melkvee - landbouwtechniek - testinstallaties - digestaat - manure treatment - separation technology - returns - pilot farms - dairy cattle - agricultural engineering - test rigs - digestate
    Op melkveeproefbedrijf De Marke is het scheidingsresultaat van de decanter van GEA Westfalia Separator vastgesteld. Met de gemeten resultaten is het scheidingsrendement berekend. Er zijn 4 testen met digestaat uitgevoerd. Elke test had een andere instelling van de decanter. Met rundveemest zijn 2 testen uitgevoerd met dezelfde instelling. De decanter van GEA Westfalia Separator is geschikt om een dikke en dunne fractie te produceren waarmee op maat kan worden bemest met dierlijke mest. Het scheidingsrendement van fosfaat is hoog en dat is gunstig wanneer een bedrijf fosfaat met dierlijke mest moet afvoeren. Bij scheiden van rundveemest komt 34% van de massa in de dikke fractie en dat is gunstig wanneer een bedrijf met mestscheiding opslagruimte wil creëren voor drijfmest.
    Het gebruik van de dunne en dikke fractie van rundveemest op proefbedrijf De Marke : doel, planvorming, uitvoering en resultaten
    Verloop, K. ; Hilhorst, G.J. - \ 2010
    Lelystad : Animal Sciences Group (Koeien & kansen 58) - 29
    melkveehouderij - bemesting - dierlijke meststoffen - scheidingstechnologie - gebruikswaarde - mestbeleid - drijfmest - dairy farming - fertilizer application - animal manures - separation technology - use value - manure policy - slurries
    Deze studie naar de haalbaarheid van op maat bemesten van percelen op proefbedrijf De Marke op basis van alleen drijfmest en de scheidingsproducten daarvan, is een onderdeel van het project ‘Koeien & Kansen’. Dit is een samenwerkingsverband van 16 melkveehouders, De Marke, Wageningen UR en adviesdiensten. Het project toetst en onderzoekt in opdracht van het ministerie van EL&I en het Productschap Zuivel (PZ) de effectiviteit en uitvoerbaarheid van (voorgenomen) mestregelgeving in de Nederlandse melkveehouderij. Een onderdeel van het onderzoek is gericht op het doorbreken van de afhankelijkheid van kunstmest. Mestscheiding kan hier aan bijdragen. Om die bijdrage te onderzoeken heeft het Productschap Zuivel (PZ) opdracht gegeven voor het project ‘Beter benutten door dik en dun’. Inzichten uit ‘Beter benutten door dik en dun’ worden gebruikt in het ‘Koeien & Kansen’-onderzoek en andersom.
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