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Gude, J.C.J. (author), Rietveld, L.C. (author), van Halem, D. (author)The objective of this study was to investigate whether arsenic-oxidising bacteria (AsOB) will grow and survive in rapid sand filters. Additionally, the interdependence of other groundwater constituents (Fe(II), Mn(II), NH<sub>4</sub>) with biological As(III) oxidation was investigated. For this purpose As(III) oxidation was monitored in pilot...journal article 2018
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Gude, J.C.J. (author), Joris, K. (author), Huysman, K. (author), Rietveld, L.C. (author), van Halem, D. (author)Current groundwater treatment facilities, mostly relying on aeration-filtration configurations, aim at the removal of iron (Fe), ammonia (NH <sub>4</sub> <sup>+</sup> ) and manganese (Mn). However, recently water companies expressed the ambition to also reduce arsenic (As) concentrations in these rapid sand filters. The aim of this study was...journal article 2018
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Peters, M.C.F.M. (author), Keuten, M.G.A. (author), Knezev, Aleksandra (author), van Loosdrecht, Mark C.M. (author), Vrouwenvelder, J.S. (author), Rietveld, L.C. (author), de Kreuk, M.K. (author)Bathers release bacteria in swimming pool water, but little is known about the fate of these bacteria and potential risks they might cause. Therefore, shower water was characterized and subjected to chlorination to identify the more chlorine-resistant bacteria that might survive in a chlorinated swimming pool and therefore could form a...journal article 2018
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Beek, W. (author), Folmer, E. (author), Rietveld, L.C. (author), Baving, T. (author), van Altena, V.P. (author)3D environments allow advanced spatial navigation and visualization, but have traditionally provided limited support for performing non-spatial data analysis operations like filtering, joining, and integrating data on-the-fly. Linked Open Data provides advanced support for performing filters and joins over datasets that can be dynamically...journal article 2018
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- Kramer, F.C. (author), Wantz, Eliot (author), Shang, R. (author), Heijman, Sebastiaan (author), Rietveld, L.C. (author) poster 2017
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Gutiérrez, Juan Pablo (author), van Halem, D. (author), Rietveld, L.C. (author)The poor quality of many Colombian surface waters forces us to seek alternative, sustainable treatment solutions with the ability to manage peak pollution events and to guarantee the uninterrupted provision of safe drinking water to the population. This review assesses the potential of using riverbank filtration (RBF) for the highly turbid...journal article 2017
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Gude, J.C.J. (author), Rietveld, L.C. (author), van Halem, D. (author)The top layer of natural rapid sand filtration was found to effectively oxidise arsenite (As(III)) in groundwater treatment. However, the oxidation pathway has not yet been identified. The aim of this study was to investigate whether naturally formed manganese oxide (MnO<sub>2</sub>), present on filter grains, could abiotically be responsible...journal article 2017
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Peters, M.C.F.M. (author), Keuten, M.G.A. (author), de Kreuk, M.K. (author), Vrouwenvelder, J.S. (author), Rietveld, L.C. (author), Medema, G.J. (author)Aims Most swimming pools use residual disinfectants like chlorine for disinfection. The use of chlorine has several drawbacks: some waterborne-pathogens are chlorine resistant and disinfection by-products (DBPs) may be formed which are associated with various health risks. Therefore, an alternative treatment was developed which consists of...abstract 2017
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Keuten, M.G.A. (author), Peters, M.C.F.M. (author), van Dijk, J.C. (author), van Loosdrecht, Mark C.M. (author), Rietveld, L.C. (author)Swimming pools are traditionally disinfected with a residual disinfectant such as sodium hypochlorite. Nowadays, swimming water without a residual disinfectant is increasingly popular, as can be seen by the growing number of (natural) swimming ponds (Weilandt 2015), but health risks for bathers do raise concerns for these type of pools, so some...abstract 2017
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Peters, M.C.F.M. (author), Keuten, M.G.A. (author), de Kreuk, M.K. (author), Vrouwenvelder, J.S. (author), Rietveld, L.C. (author), Medema, G.J. (author)<br/>other 2017
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- Keuten, M.G.A. (author), Peters, M.C.F.M. (author), van Dijk, J.C. (author), van Loosdrecht, Mark C.M. (author), Rietveld, L.C. (author) other 2017
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Shang, R. (author), Goulas, A (author), Tang, CY (author), De Frias Serra, X. (author), Rietveld, L.C. (author), Heijman, Sebastiaan (author)Tight ceramic nanofiltration (NF) membranes allow efficient separation of organic matter and ions for advanced water treatment. These membranes are typically produced by the sol-gel method. Recently, atomic layer deposition (ALD), a self-limiting gas phase coating technique, has been explored for membrane fabrication and modification. In this...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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Gutiérrez, Juan Pablo (author), Delgado, Luis Germán (author), van Halem, D. (author), Wessels, Peter (author), Rietveld, L.C. (author)Guaranteeing a safe and continuous drinking water supply for the city of Cali, Colombia, has become a concern for the water company of Cali, the environmental authorities, universities, and entities involved in the water resource. The progressive deterioration of the city’s water sources has led to a search for future water sources and/or...journal article 2016
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Ross, P.S. (author), van der Helm, A.W.C. (author), Van Den Broeke, J. (author), Rietveld, L.C. (author)The application of ozone in water treatment serves many purposes, such as disinfection and degradation of organic micro-pollutants. To optimise the applied ozone dosage by on-line control, real-time information on the actual Ct value, the bromate and assimilable organic carbon concentration (AOC) is necessary. With UV/Vis spectroscopy,...journal article 2016
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Rietveld, L.C. (author), Siri, J.G. (author), Chakravarty, I. (author), Arsenio, A.M. (author), Biswas, R. (author), Chatterjee, A. (author)Background: As human populations become more and more urban, decision-makers at all levels face new challenges related to both the scale of service provision and the increasing complexity of cities and the networks that connect them. These challenges may take on unique aspects in cities with different cultures, political and institutional...conference paper 2016
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Gutiérrez, Juan Pablo (author), van Halem, D. (author), Rietveld, L.C. (author)The particulate matter composition in the Upper Cauca River section was studied, considering the importance of this river for the water supply of Cali, Colombia, and the implications that the turbidity of this water source has had for the city's water treatment. Additionally, the upstream Palo River was investigated, as this river is a major...journal article 2016
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Hu, J. (author), Aarts, A.L.F. (author), Shang, R. (author), Heijman, Sebastiaan (author), Rietveld, L.C. (author)Integrating powdered activated carbon (PAC) into wastewater tertiary treatment is a promising technology to reduce organic micro-pollutant (OMP) discharge into the receiving waters. To take advantage of the existing tertiary filter, PAC was pre-embedded inside the filter bed acting as a fixed-bed adsorber. The pre-embedding (i.e. immobilization)...journal article 2016
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- Borges Freitas, S.C. (author), Van Halem, D. (author), Van der Meer, W.G.J. (author), Rietveld, L.C. (author) conference paper 2014
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Mohd Amin, M.F. (author), Heijman, S.G.J. (author), Lopes, S.I.C. (author), Rietveld, L.C. (author)This paper reports on the direct ability of two positively charged organic polyelectrolytes (natural-based and synthetic) to reduce the atrazine concentration in water. The adsorption study was set up using multiple glass vessels with different polymer dosing levels followed by ultrafiltration with a 1?kDa membrane. The addition of polymers...journal article 2014