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- van der Hoek, J.P. (author), Mol, S (author), Ahmad, J.I. (author), Liu, G. (author), Medema, G.J. (author) conference paper 2017
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Bertelkamp, C. (author), Hofman-Caris, R (author), Roelandse, A. (author), van der Aa, R. (author), van der Hoek, J.P. (author)Het idee om van regenwater drinkwater te maken wordt door steeds meer mensen omarmd. Is regenwater schoon, hoeveel neerslag valt er eigenlijk, en wat zijn de gevolgen, voor zowel drinkwaterbedrijven als huishoudens van het gebruik van regenwater om er drinkwater van te maken? Uit literatuuronderzoek blijkt dat er via daken minder neerslag kan...journal article 2017
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Kramer, O.J.I. (author), de Moel, P.J. (author), Baars, E.T. (author), van Vugt, W.H. (author), van der Hoek, J.P. (author)Natural particles are frequently applied in drinking water treatment in up-flow fluidisation processes. Additionally, sedimentation processes are applied to clarify water and to concentrate solids. To estimate the terminal settling velocity of single solid particles in a liquid system, a comprehensive collection of equations is available. For...conference paper 2017
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Kramer, O.J.I. (author), de Moel, P.J. (author), Baars, E.T. (author), van Vugt, W.H. (author), van der Hoek, J.P. (author)The literature provides a comprehensive collection of equations to estimate the<br/>terminal settling velocity of single solid particles in a liquid system. The settling velocity for perfectly round spheres can accurately be calculated. In the contrary for natural imperfect particles the experimentally measured settling velocity deviates...conference paper 2017
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Fischer, A. (author), ter Laak, T (author), Bronders, J. (author), Desmet, N. (author), Christoffels, E. (author), van Wezel, A (author), van der Hoek, J.P. (author)Water authorities and drinking water companies are challenged with the question if, where and how to abate contaminants of emerging concern in the urban water cycle. The most effective strategy under given conditions is often unclear to these stakeholders as it requires insight into several aspects of the contaminants such as sources, properties...journal article 2017
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Elias Maxil, J.A. (author), Hofman, J.A.M.H. (author), Wols, B.A. (author), Clemens, F.H.L.R. (author), van der Hoek, J.P. (author), Rietveld, L.C. (author)This paper presents a model (inspired by another model) to calculate water temperature in free-surface flow with two main innovations: the convective heat transfer occurs only at the wetted perimeter of pipes, and the model was integrated to commercial software used for hydraulic calculations in drainage systems. Given these innovations, we...journal article 2017
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Zlatanovic, L. (author), van der Hoek, J.P. (author), Vreeburg, J.H.G. (author)The drinking water quality changes during the transport through distribution systems. Domestic drinking water systems (DDWSs), which include the plumbing between the water meter and consumer's taps, are the most critical points in which water quality may be affected. In distribution networks, the drinking water temperature and water residence...journal article 2017
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Wang, F. (author), van Halem, D. (author), Liu, G. (author), Lekkerkerker, K. (author), van der Hoek, J.P. (author)H2O2 residuals from advanced oxidation processes (AOPs) may have critical impacts on the microbial ecology and performance of subsequent biological treatment processes, but little is known. The objective of this study was to evaluate how H2O2 residuals influence sand systems with an emphasis on dissolved organic carbon (DOC) removal, microbial...journal article 2017
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Zlatanovic, L. (author), Moerman, A. (author), van der Hoek, J.P. (author), Vreeburg, J.H.G. (author), Blokker, M (author)Domestic drinking water supply systems (DDWSs) are the final step in the delivery of drinking water to consumers. Temperature is one of the rate-controlling parameters for many chemical and microbiological processes and is, therefore, considered as a surrogate parameter for water quality processes. In this study, a mathematical model is...journal article 2017
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van der Hoek, J.P. (author), de Fooij, Heleen (author), Struker, André (author)Resources are becoming scarce. Therefore, reuse of resources is becoming more and more attractive. Wastewater can be used as a resource, since it contains many resources like organic matter, phosphorus, nitrogen, heavy metals, thermal energy, etc. This study focused on the reuse of organic matter and phosphorus from Amsterdam’s wastewater. There...journal article 2016
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Testing the robustness of two water distribution system layouts under changing drinking water demandAgudelo-Vera, Claudia (author), Blokker, M (author), Vreeburg, J (author), Vogelaar, H. (author), Hillegers, S (author), van der Hoek, J.P. (author)A drinking water distribution system (DWDS) is a critical and a costly asset with a long lifetime. Drinking water demand is likely to change in the coming decades. Quantifying these changes involves large uncertainties. This paper proposes a stress test on the robustness of existing DWDS under changing drinking water demands. The stress test...journal article 2016
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Deng, Z. (author), Mol, S. (author), Van der Hoek, J.P. (author)The heating of drinking water in households contributes significantly to the emission of greenhouse gases. As a water utility aiming to operate at a climate neutral level by 2020, Waternet needs to reduce its CO2 emission by 53?kton?yr?1. To contribute to this ambition, a pilot project was carried out in Uilenstede, Amstelveen, the Netherlands,...journal article 2016
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de Goede, J.A.C. (author), Enserink, B. (author), Worm, G.I.M. (author), van der Hoek, J.P. (author)Since 1997, the performance of Dutch drinking water companies are compared to each other using a benchmark. After a period of much improvement, the process now seems to be stagnating. Why? And what can be done about it?journal article 2016
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de Goede, J.A.C. (author), Enserink, B. (author), Worm, G.I.M. (author), van der Hoek, J.P. (author)The Dutch drinking water sector has been benchmarked every 3 years since 1997, and the sector has significantly improved performance since then.Based on interviews withCEOs and financial managers of drinkingwater companies<br/>five drivers for improvement as a result of this benchmark are identified: ‘learning effect’, ‘enhanced transparency’, ...journal article 2016
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- Wang, F. (author), van Halem, D. (author), van der Hoek, J.P. (author) journal article 2016
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Hofs, B (author), Baars, ET (author), Palmen, LJ (author), Elings, JA (author), Kors, L.J. (author), Kramer, O.J.I. (author), Koppers, H (author), van der Hoek, J.P. (author)About 50% of the drinking water in the Netherlands is centrally softened by the drinking water companies in a process known as pellet softening. In this process a base and seeding material are mixed in an upflow reactor, where subsequently CaCO3 precipitates on a seed core as pellets. The seeding material is usually sand, but recently CaCO3 was...conference paper 2015
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Hofman, R. (author), Van der Hoek, J.P. (author)Het is ondoenlijk om voor elk nieuw stofje in bronnen voor drinkwater testen uit te voeren om na te gaan hoe dit stofje het beste verwijderd zou kunnen worden. Mogelijk bieden nieuwe rekenkundige methoden, waarmee staCsCsch verbanden tussen bijvoorbeeld eigenschappen en gedrag van een stof worden berekend (QSAR’s), hier uitkomst. QSAR’s staan...journal article 2014
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Moerman, A. (author), Blokker, M. (author), Vreeburg, J. (author), Van der Hoek, J.P. (author)Domestic water supply systems are the final stage of the transport process to deliver potable water to the customers’ tap. Under the influence of temperature, residence time and pipe materials the drinking water quality can change while the water passes the domestic drinking water system. According to the Dutch Drinking Water Act the drinking...journal article 2014
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Agudelo-Vera, C. (author), Blokker, M. (author), Vreeburg, J. (author), Bongard, T. (author), Hillegers, S. (author), Van der Hoek, J.P. (author)A methodology to determine the robustness of the drinking water distribution system is proposed. The performance of three networks under ten future demand scenarios was tested, using head loss and residence time as indicators. The scenarios consider technological and demographic changes. Daily patterns were simulated with SIMDEUM for each...journal article 2014
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Hummelen, A.M. (author), Pieron, M. (author), Van Der Hoek, J.P. (author)De Nederlandse drinkwaterbedrijven investeren al meer dan veertig jaar in een collectief onderzoeksprogramma (BTO) en een gezamelijk kennisinstituut (KWR). Deze bundeling van krachten resulteert in internationaal toonaangevend drinkwateronderzoek; het kennisnetwerk, ontmoetingsplatform en cofinancieringsbrug. Eens per jaar vindt een uitgebreide...journal article 2014