Publicaties

4073 resultaten

  • Stand van zaken rond het verspreiden van baggerspecie

    Auteurs: Wijdeveld, A.J.; Vink, J.P.M. (2012)

    De beoordeling of baggerspecie verspreid mag worden op land is in het Besluit Bodemkwaliteit (Bbk) uitgewerkt. Wat in het Bbk niet beschouwd wordt is het effect van het op land zetten van baggerspecie. Door het in contact komen met lucht treden reacties op die de mobiliteit van onder andere zware metalen en arseen beinvloeden. Dit kennishiaat van tijdelijke effecten in de overgang van nat naar droog en vice versa is eerder geconstateerd bij het storten van landbodems in zandwinputten.

  • Verkennende studie naar lozing van microplastics door rwzi’s

    Auteurs: Leslie, H.A.; Moester, M.; Kreuk, M. de; Vethaak, A.D. (2012)

    In dit artikel wordt aangetoond dat microplastics ook de Nederlandserioolwaterzuiveringsinstallaties bereiken en voor een deel weer geloosd worden als component via het effluent. Tevens zijn microplactics gevonden in watermonsters van de Noordzee. De emissiebronnen hiervan zijn divers.

  • Pleidooi voor landelijk stroomgebiedenmeetnet

    Auteurs: Rozemeijer, J.C.; Klein, J.; Broers, H.P.; Passier, H.F. (2012)
    Gepubliceerd in: H2O : tijdschrift voor drinkwatervoorziening en afvalwaterbehandeling, volume 44 (2012) nummer 19, pagina 16-17

  • Grondwater als buffer om droogte te voorkomen

    Auteurs: Kuijper, M.J.M.; Hommes, S.; Broers, H.P. (2013)
    Gepubliceerd in: Land en water : vakblad voor de praktijk van civiel- en milieutechnici, volume 53 (2013) nummer 1-2, pagina 26-27

  • The effect of nitrite inhibition on the anammox process

    Auteurs: Lotti, T.; Star, W.R.L. van der (2012)
    Gepubliceerd in: Water research : a journal of the International Water Association, volume 46 (2012) nummer 8, pagina 2559-2569

    The negative effect of nitrite on anammox activity has been reported widely during the past decade. Although the adverse effect is clear, conflicting reports exist on the level at which it occurs and its reversible/irreversible nature. An in depth study on nitrite inhibition therefore was performed in which the influence of environmental factors was evaluated. Anammox activity was measured in anammox granules by continuously monitored standardized manometric batch tests extending the interpretation by evaluation of lag times, maximum conversion rates during the tests and substrates/product conversion ratios. The granules where obtained from a one-stage anammox reactor, the dominant anammox organisms belonged to the Brocadia type. The observed 50% activity inhibition for nitrite (IC50) was 0.4 g N L-1. The activity recovered fully after removal of the nitrite. Conversion in fresh medium after exposure to up to 6 g NO2 N L-1 for 24 h showed less then 60% loss of activity. Presence of ammonium during nitrite (2 g N L-1) exposure resulted in a stronger loss of activity after nitrite exposure (50% and 30% in presence and absence of ammonium respectively). Presence of oxygen during nitrite incubation led to a maximum activity reduction of 32%. The recovery after exposure indicates that the adverse effect of nitrite is reversible and thus inhibitory rather than toxic in nature. Similarities between exposure at three different pH-values indicate that nitrite rather than nitrous acid is the actual inhibiting compound.

  • Model experiments on piled embankments

    Auteurs: Eekelen, S.J.M. van; Bezuijen, A.; Tol, A.F. van (2012)
    Gepubliceerd in: Geotextiles and geomembranes, volume 32 (2012), pagina 69-81 (part I) ; p. 82-94 (part II)

    A series of twelve 3D laboratory model tests was performed on piled embankments. In the first part of a two-part study, the measured load distribution, deformation, and strains are presented and analysed. In the second part, the measurements are compared with calculations using EBGEO (2010), and suggestions are given for improvements to this calculation model.

  • Physical and numerical modeling of the entrainment by a high-concentration mud suspension

    Auteurs: Bruens, A.W.; Kranenburg, C.; Winterwerp, J.C. (2012)

    This paper presents the results of a physical and numerical model study on the entrainment by a high-concentration, cohesive sediment suspension.

  • Geosynthetics in levee improvement - “An innovation is only an innovation when applied successfully!” : workshop Dutch chapter of IGS (Netherlands, 7 February 2012)

    Auteur: Eekelen, S.J.M. van (2012)

    After the desciption of two actual cases of levee improvement by using geosynthetics in The Netherlands, it is concluded that it is possible to create less expensive and more sustainable solutions with geosynthetics, but it needs courage from the water board authorities to take the step from earth structures with granular filter layers to structures with geosynthetics.

  • Modeling groundwater flow through dikes and levees for real time stability assessment

    Auteur: Esch, J.M. van (2012)

    Within the INCAH project a groundwater moduel has been developed. The groundwater module simulates groundwater flow through dikes andprovides a computationally efficient procedure for predicting time dependent pore pressure fields. The water pressure fields support a slope stability analysis for dike cross sections, which are successfully used for eal time stability assessment of entire flood defense systems. These sults can be used to support timely decisions on preventive or remedial actions like the evacuation of people that live in the protected area or the use of retention polders, which reduces river level peaks.

  • Kaderrichtlijn water lift mee met Ruimte voor de Rivier

    Auteurs: Liefveld, W.M.; Buijse, A.D. (2009)

    Rijkswaterstaat heeft de mogelijkheden laten onderzoeken voor synergie tussen maatregelen voor Ruimte voor de Rivier en de Kaderrichtlijn Water. De beste kansen liggen bij nevengeulen, uiterwaardverlaging, plassen en strangen, en kreken.

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