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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    Responsible Water Reuse Needs an Interdisciplinary Approach to Balance Risks and Benefits
    Dingemans, Milou M.I. ; Smeets, Patrick W.M.H. ; Medema, Gertjan ; Frijns, Jos ; Raat, Klaasjan J. ; Wezel, Annemarie P. van; Bartholomeus, Ruud P. - \ 2020
    Water 12 (2020)5. - ISSN 2073-4441
    Freshwater is a precious resource, and shortages can lead to water stress, impacting agriculture, industry, and other sectors. Wastewater reuse is increasingly considered as an opportunity to meet the freshwater demand. Legislative frameworks are under development to support the responsible reuse of wastewater, i.e., to balance benefits and risks. In an evaluation of the proposed European regulation for water reuse, we concluded that the proposed regulation is not practically feasible, as the water provider alone is responsible for the risk assessment and management, even beyond their span of control. The required knowledge and resources are extensive. Therefore, without clear guidance for implementation, the regulation would hinder implementation of reuse programs. As a consequence, the current practice of uncontrolled, unintentional, and indirect reuse continues, including related risks and inefficiency. Therefore, we provide an outline of the interdisciplinary approach required to design and achieve safe, responsible water reuse. Responsible water reuse requires knowledge of water demand and availability, quality and health, technology, and governance for the various types of application. Through this paper we want to provide a starting point for an interdisciplinary agenda to compile and generate knowledge (databases), approaches, guidelines, case examples, codes of practice, and legislation to help bring responsible water reuse into practice.
    Diffusion Decoupling in Binary Colloidal Systems Observed with Contrast Variation Multispeckle Diffusing Wave Spectroscopy
    Higler, Ruben ; Frijns, Raoul A.M. ; Sprakel, Joris - \ 2019
    Langmuir 35 (2019)17. - ISSN 0743-7463 - p. 5793 - 5801.

    In the study of colloidal glasses, crystallization is often suppressed by leveraging size polydispersity, ranging from systems where particle sizes exhibit a continuous distribution to systems composed of particles of two or more distinct sizes. The effects of the disparities in size of the particles on the colloidal glass transition are not yet completely understood. Especially, the question of the existence of a decoupled glass transition between the large and small population remains. In order to measure colloidal dynamics on very long time scales and to disentangle the dynamics of the two populations, we employ contrast variation multispeckle diffusing wave spectroscopy. With this method, we aim to analyze the effect of size ratio, a = r PS /r pNIPAM , on particle dynamics near the glass transition of a binary colloidal system. We find that both for long-time (α-) and short-time (β-) relaxation, the dynamics of the small particles either completely decouple from the large ones (a = 0.2), moving freely through a glassy matrix, or are identical to the dynamics of the larger-sized population (a = 0.37 and 1.44). For a size ratio of 0.37, we find a single-glass transition for both particle populations. The postulated double-glass transition in simulations and theory is not observed.

    Laser Speckle Strain Imaging reveals the origin of delayed fracture in a soft solid
    Kooij, Hanne M. van der; Dussi, Simone ; Kerkhof, Gea T. van de; Frijns, Raoul A.M. ; Gucht, Jasper van der; Sprakel, Joris - \ 2018
    Science Advances 4 (2018)5. - ISSN 2375-2548

    Stresses well below the critical fracture stress can lead to highly unpredictable delayed fracture after a long period of seemingly quiescent stability. Delayed fracture is a major threat to the lifetime of materials, and its unpredictability makes it difficult to prevent. This is exacerbated by the lack of consensus on the microscopic mechanisms at its origin because unambiguous experimental proof of these mechanisms remains absent. We present an experimental approach to measure, with high spatial and temporal resolution, the local deformations that precipitate crack nucleation. We apply this method to study delayed fracture in an elastomer and find that a delocalized zone of very small strains emerges as a consequence of strongly localized damage processes. This prefracture deformation zone grows exponentially in space and time, ultimately culminating in the nucleation of a crack and failure of the material as a whole. Our results paint a microscopic picture of the elusive origins of delayed fracture and open the way to detect damage well before it manifests macroscopically.

    Public participation in science : The future and value of citizen science in the drinking water research
    Brouwer, Stijn ; Wielen, Paul W.J.J. van der; Schriks, Merijn ; Claassen, Maarten ; Frijns, Jos - \ 2018
    Water 10 (2018)3. - ISSN 2073-4441
    Amsterdam - Citizen science - Drinking water quality - Knowledge generation - Participation
    This paper explores the value of involving citizens in the generation of knowledge in drinking water research. To this end, the significance of the 'Freshness of Water' citizen science project on the microbiological stability of drinking water was analyzed, supplemented with a series of expert interviews. In this project, citizens of Amsterdam participated in taking samples from their own kitchen tap and testing the water using test strips. The subsequent monitoring of bacteria revealed that the total number of bacterial species in all of the Amsterdam drinking water samples was high. For the participants, the presence of ten thousands of bacterial species in their drinking water, as well as the interpretation that this is perfectly normal and not a health concern, was obviously new. However, instead of causing concern or worry, this transparency clearly functioned as a strong confidence-inducing signal. A majority of the citizen scientists state that, as a result of their participation, their confidence in the quality of drinking water and the water company has increased. This study suggests that citizen science can raise the participant's water awareness and that, with the appropriate support, non-professionals can make a valuable contribution to scientific drinking water research.
    Het Deelerwoud: Wild en bijster land
    Frijns, Martien ; Bosch, Machiel ; Driessen, C.P.G. ; Purmer, Michiel ; Breman, Gerrit ; Bosch, Jeroen - \ 2016
    AFdH - ISBN 9789072603548
    In Het Deelerwoud – Wild en bijster land verkennen zeven mannen dit natuurgebied, dat midden op de Veluwe ligt. Natuurmonumenten verwierf het gebied in 1967 na een zeer succesvolle landelijke actie – een van de eerste grote publieksacties voor natuurbehoud in Nederland. Het Deelerwoud is een bijzonder gebied. Sinds 2001 worden hier de dam- en edelherten niet meer afgeschoten. Ruim tien jaar later geldt voor de wilde zwijnen hetzelfde. In dit prachtig geïllustreerde en leerzame boek wandelt de lezer mee met natuurbeheerder Machiel Bosch, filosoof Clemens Driessen en schrijver en natuurliefhebber Martien Frijns. Wat zien we, waarover horen we, waarover wordt er gedacht? De wandeltochten door het Deelerwoud roepen vragen op over onder andere 100%-wildgarantie, geluidshinder, lerend beheren, fauna versus flora, de Amsterdamse Waterleidingduinen, de Oostvaardersplassen, charismatische relaties in de natuur, safari-joggen, de Hooglander en het Heck-rund, de raaf en de uil, rewilding en natuur in de oksels van de snelwegen. Maar ondertussen leert de lezer ook zeker twaalf soorten poep kennen.
    Microfluidic production of multiple emulsions and functional microcapsules
    Lee, Tae Yong ; Choi, Tae Min ; Shim, Tae Soup ; Frijns, Raoul A.M. ; Kim, Shin Hyun - \ 2016
    Lab on a Chip 16 (2016)18. - ISSN 1473-0197 - p. 3415 - 3440.

    Recent advances in microfluidics have enabled the controlled production of multiple-emulsion drops with onion-like topology. The multiple-emulsion drops possess an intrinsic core-shell geometry, which makes them useful as templates to create microcapsules with a solid membrane. High flexibility in the selection of materials and hierarchical order, achieved by microfluidic technologies, has provided versatility in the membrane properties and microcapsule functions. The microcapsules are now designed not just for storage and release of encapsulants but for sensing microenvironments, developing structural colours, and many other uses. This article reviews the current state of the art in the microfluidic-based production of multiple-emulsion drops and functional microcapsules. The three main sections of this paper discuss distinct microfluidic techniques developed for the generation of multiple emulsions, four representative methods used for solid membrane formation, and various applications of functional microcapsules. Finally, we outline the current limitations and future perspectives of microfluidics and microcapsules.

    Continuous-flow alcohol protection and deprotection reactions catalyzed by silica-supported sulfonic acid
    Berg, Sebastiaan A. van den; Frijns, Raoul A.M. ; Wennekes, Tom ; Zuilhof, Han - \ 2015
    Journal of Flow Chemistry 5 (2015)2. - ISSN 2062-249X - p. 95 - 100.
    Alcohol protection and deprotection - Catalysis - Continuous flow - Packed bed - Silyl ether

    Alcohol protection and deprotection reactions, catalyzed by solid-supported sulfonic acid, have been investigated under continuous-flow conditions. Primary, secondary, benzylic and phenolic alcohols can be protected under these conditions by tetrahydropyranyl and several silyl ether moieties, generating synthetically useful amounts of material in short time. Furthermore, the described setup can be used to deprotect protected alcohols and be used in selective protection reactions. Because the solid-supported acid catalyst is continually reused in a packed-bed approach, workup is greatly simplified and in most cases only solvent removal is necessary, while reaching high turn-over numbers.

    Bodemleven op Planken Wambuis
    Putten, W.H. van der; Bezemer, T.M. - \ 2013
    In: Wild en Bijster Land: Planken Wambuis: / Abels, P., Bosch, M., Crans, A., Frijns, M., Enschede/Doetinchem : AFdH - ISBN 9789072603968 - p. 362 - 383.
    Consumer-inclusive innovation strategies for the Dutch water supply sector: Opportunities for more sustainable products and services
    Hegger, D.L.T. ; Spaargaren, G. ; Vliet, B.J.M. van; Frijns, J. - \ 2011
    NJAS Wageningen Journal of Life Sciences 58 (2011)1-2. - ISSN 1573-5214 - p. 49 - 56.
    This article reflects on the consequences of contemporary shifts in the relationships between water utilities, their competitors and domestic end users. Such changing relations come along with the development of new more sustainable products and services. By distinguishing between ‘upstream’ vs. ‘downstream’ and ‘core’ vs. ‘non-core’ innovations in water supply, a conceptual tool was developed and applied to analyse innovations in the Dutch water supply sector both from a provider and a consumer perspective. To assess the role of (eco)innovations in the Dutch water supply sector, the paper reviews current trends in water consumption; consumers’ perception of water services and contemporary innovation strategies of water supply companies. Based on focus group discussions with both water professionals and water consumers, new roles and products for Dutch water supply companies were identified. It was shown that there are fits as well as misfits in the ways in which providers and consumers tend to look at the future of sustainable water supply. Knowing about and relating to consumer preference and practices can be instrumental for water providers when developing new products, services, images and roles
    Wat wil de klant van het waterbedrijf? [thema Drinkwater]
    Vloerbergh, I.N. ; Frijns, J. ; Hegger, D.L.T. ; Ven, A. van de - \ 2010
    H2O : tijdschrift voor watervoorziening en afvalwaterbehandeling 43 (2010)8. - ISSN 0166-8439 - p. 30 - 31.
    watervoorziening - drinkwater - klanttevredenheid - consumentenonderzoeken - houding van consumenten - professionele dienstverlening - bedrijfsvoering - water supply - drinking water - consumer satisfaction - consumer surveys - consumer attitudes - professional services - management
    In het kader van bedrijfstakonderzoek Client21 voerde KWR Watercycle Research Institute met collega-instituten in het Europese onderzoeksproject TECHNEAU een studie uit naar klantwensen en bedrijfsprestaties. Met medewerkers van de Wageningen Universiteit zijn ontwikkelingen in de gedragspraktijk van waterverbruik in kaart gebracht. Hieruit blijkt dat de Nederlandse drinkwaterconsument over het algemeen tevreden is en het liefst alles wil houden zoals het is. Hij of zij wenst zich niet druk te hoeven maken over drinkwater. Het moet schoon, veilig en altijd voorhanden zijn, tegen een redelijke prijs. Hoewel in de sector het idee leeft dat het verstrekken van informatie het vertrouwen van consumenten vergroot, blijkt de gemiddelde consument weinig behoefte te hebben aan huis-aan-huis verspreide informatie over drinkwaterzaken. Verder blijken de gedragspraktijken rond watergebruik te veranderen. Consumenten zien water steeds meer als onderdeel van hun behoefte aan een goede gezondheid, wellness of comfort. Drinkwaterbedrijven kunnen hun dienstverlening verbeteren door hierop in te spelen. Consumenten vinden innovaties en nieuwe rollen bij het drinkwaterbedrijf passen, zolang deze op één of andere manier te maken hebben met waterkwaliteit en milieu (verantwoord gebruik).
    Eerst water, maar ook denken aan later
    Hegger, D.L.T. ; Vliet, B.J.M. van; Spaargaren, G. ; Frijns, J. - \ 2010
    Nieuwegein : KWR Watercycle Research Institute (KWR 2010.033) - 79 p.
    Meer dan drinkwater alleen. Nieuwe relaties tussen drinkwaterbedrijf en consument
    Hegger, D.L.T. ; Vliet, B.J.M. van; Spaargaren, G. ; Frijns, J.A.G. - \ 2009
    Wageningen / Nieuwegein : WUR Environmental Policy / KWR Watercycle Research Institute - 82 p.
    Drinkwater innovaties voor de huishoudelijke eindgebruiker: inventarisatie van praktijkvoorbeelden
    Hegger, D.L.T. ; Vliet, B.J.M. van; Spaargaren, G. ; Frijns, J. - \ 2008
    Wageningen : Wageningen Universiteit & KWR Watercycle Research Institute - 72
    water - drinkwater - kraanwater - watervoorziening - koelsystemen - waterzuivering - huishoudens - innovaties - innovatie adoptie - watergebruik - consumentengedrag - huishoudelijke consumptie - consumenten - nederland - water - drinking water - tap water - water supply - cooling systems - water treatment - households - innovations - innovation adoption - water use - consumer behaviour - household consumption - consumers - netherlands
    KIWA Waterresearch coördineert het Bedrijfstakonderzoek (BTO) voor de drinkwatersector. In het kader van het BTO is de onderzoekslijn Client 21 opgezet, waarbinnen verschillende klantgerelateerde kennisvragen aan bod komen. Toekomstig klantgedrag is één van die kennisvragen. Om inzicht te verkrijgen in toekomstig klantgedrag laat Kiwa Water Research het onderhavige onderzoek ‘gedragspraktijk watergebruik’ uitvoeren, waarvan dit rapport het eerste product is
    Changing social practices of domestic water consumption: new roles for Dutch water companies?
    Hegger, D.L.T. ; Vliet, B.J.M. van; Spaargaren, G. ; Frijns, J. - \ 2008
    In: Een andere rol voor de overheid? / van den Burg, S.W.K., Spaargaren, G., van Lith, D., Wageningen : Wageningen Universiteit - Milieubeleid - ISBN 9789064642333 - p. 135 - 139.
    Ecological Modernisation Theory and Industrialising Economies : The Case of Viet Nam
    Frijns, J. ; Phuong Thuy Phung, ; Mol, A.P.J. - \ 2000
    Environmental Politics 9 (2000)1. - ISSN 0964-4016 - p. 257 - 293.
    As Ecological Modernisation Theory has been developed against the background of European industrialised societies, the value and applicability of Ecological Modernisation Theory for developing or industrialising economies is often questioned. This article explores this controversy by taking Viet Nam as a case study. The analysis of environmental restructuring of contemporary economic developments in Viet Nam focuses on three major issues: state‐market relations, technology development, and environmental awareness. Regarding all three issues major deviations are found from an environmental reform trajectory as hypothesised by Ecological Modernisation Theory. The study thus concludes that Ecological Modernisation Theory is of limited value for analysing contemporary processes of and attempts at environmental reform in Viet Nam. However, recent developments in Viet Nam such as economic liberalisation, privatisation and internationalisation and the slowly starting democratisation of governance offer ecological modernisation‐inspired opportunities to incorporate environmental considerations in the economic development of Viet Nam. If Ecological Modernisation Theory is to be used to outline a feasible path of environmental reform, it has to be refined, however, to fit the specific local conditions and institutional developments of industrialising countries.
    Small-scale industry and cleaner production strategies
    Frijns, J. ; Vliet, B. van - \ 1999
    World Development 27 (1999)6. - ISSN 0305-750X - p. 976 - 984.
    Environmental reforms in industrial Viet Nam
    Mol, A.P.J. ; Frijns, J. - \ 1998
    Asia-Pacific Development Journal 5 (1998)2. - p. 117 - 139.
    The ecological modernization of developing countries: the case of Vietnam.
    Mol, A.P.J. ; Frijns, J. ; Phuong, P.T. - \ 1998
    In: ASA Conference (1998)
    International Experience with Industrial Pollution Abatement
    Mol, A.P.J. - \ 1997
    In: Cleaner Production and Small Enterprise Development in Kenya / Frijns, J., Malombe, J., Rotterdam/Nairobi : IHS/HABRI - p. 89 - 98.
    Environmental pollution and the small-scale metal sector in Nairobi
    Frijns, J. ; Kirai, P. ; Malombe, J.M. ; Vliet, B. van - \ 1997
    In: Cleaner production and small enterprise development in Kenya : Small-scale industries and environmental pollution, Nairobi, 26-27 February 1997 / J. Frijns, J.M. Malombe. - Rotterdam : Centre for the Urban Environment, 1997. - ISBN 90-6433-019-0 - p. 25 - 60.
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