The Effect of a Confining Cover Layer on Backward Erosion Piping Process: Investigation of the initial heave progression

The Netherlands is prone to flooding as more than a quarter of the country lies under sea level. To combat flooding and ensure that the country remains dry structures such are levees and dikes have been installed. However, older water retaining structures are more than ever failing the stringent safety standard assessments. These older...

Influence of Inertia on Inverse Fluidization in a narrow rectangular channel: An Experimental Study

The presence of particles in a flow can change the flow behaviour in an unpredictable manner, that leads us to multiphase flow. Multiphase flows are present in nature and in everyday life around us. The most common example of a multiphase flow, that one can think of, is the treatment of drinking water using liquid-solid fluidization in softening...

Design of a constant diameter retractable Jet-ring with inside-out jetting combined with a Vibro-hammer

Reducing noise pollution during offshore monopile installation is crucial for marine life. Current installation methods create too much noise or do not have the certainty of reaching the required depths. By using a Vibrohammer combined with a Jet-ring this problem could be solved. A Jet-ring is a tool to reduce the sand induced inside shaft...

Fluidization behavior of granular activated carbon: For drinking water treatment applications

For drinking water treatment applications, it is possible to predict the external porosity of an expanded bed of granular activated carbon in fluidized conditions. A new model has been developed with a 2% relative prediction error. <br/><br/>In order to supply sufficient and safe drinking water, water utilities use a treatment train consisting...

An improved model of calcium carbonate crystallization: An improved kinetics-model for the calcium carbonate crystallization in the fluidized bed softening reactors at the Weesperkarspel drinking water treatment plant

One of the main targets of Waternet, the water-cycle company of Amsterdam, is to increase the sustainability of water treatment. To achieve this goal, it is necessary to improve the efficiency and to decrease the use of chemicals during pellet softening process. However, the model of Van Schagen et al. (2008 b,c) that is currently used to...

Optimization of the fluidization system of the trailing suction hopper dredger

The Trailing Suction Hopper Dredgers (TSHD) are typically used for the transportation of soil. The soil in the hopper can be removed by hydraulic transport using water jets and the discharge at the bottom level of the hopper. The soil fluidization and transportation is jet assisted. The unloading process can take quite some time; the unloading...

Circulating fluidized bed of biomass gasification: Product compound prediction by application of a constrained equilibrium model

Biomass as a renewable energy resource and a carbon neutral feedstock has a big potential to replace fossil fuel. Gasification as one of thermochemical process routes in biomass utilization draws attention with regards to its broad product range. The circulating fluidized bed with the advantages of higher and rapid conversion performs as the...

Numerical Study of the Flow and Heat Transfer in Supercritical Water Based Fluidized Bed Reactor

Public version. This version is only limited to the summary. Supercritical water gasification (SCWG) is a novel process for the thermochemical conversion of wet organic waste to gas and minerals. It is an alternative to the anaerobic digestion process, dewatering followed by drying and incineration and conventional dry gasification. Its...

Characterisation of Saturated Loose Sand Samples prepared by Fluidization

The following thesis has three major purposes: (1) to explore the static liquefaction phenomenon in saturated sand as a relevant geotechnical hazard, (2) to show the conventional testing procedures for index characterisation and strength testing of saturated fine sands at low stress levels, and (3) to look into the fluidization mechanism and the...

Ion exchange for NOM removal in drinking water treatment

Ion exchange resins have found an increasing application in the drinking water treatment sector over the last few decades. The ion exchange resins have a positive ability to remove the charged natural organic matter (NOM). To apply this process in full-scale treatment, the most suitable resin has to be selected and the hydraulic behaviour of the...