Bob De Clercq

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Experimental results obtained in a batch reactor are presented showing different fast dynamic phenomena. All measured OUR-profiles show a 'start-up' phase upon substrate addition. Neither the response time of the DO-electrode, the mixing characteristics in the reactor or the extracellular transport limitations could explain this behaviour. It is(More)
This paper defines an objective economic index, which integrates both investment and fixed and variable operating costs of a wastewater treatment plant. The main objective is to standardize a cost calculation procedure, to be able to compare different treatment scenarios. The development of the cost criterion may be specific to each particular case,(More)
We perform second-harmonic generation (SHG) microscopy with circularly polarized (CP) light to measure chirality of individual twisted-cross gold nanodimers. The chiral signatures, based on different SHG response for the two CP components of incident light, are clearly visible even with off-resonance excitation. The SHG responses of individual nanodimers(More)
Over a period of 227 days properties of activated sludge grown in an sequencing batch reactor (SBR) operated under stable conditions were analyzed. Settling properties (sludge volume index (SVI)) of the activated sludge were compared with on-line measurements of floc size and size distribution obtained by using a laser light scattering technique (Malvern(More)
This paper illustrates the modeling and the control of the equalization system of a full scale industrial wastewater treatment plant. The structure of the system is very specific and a number of difficulties are pointed out and then solved using an optimal controller associated with a fuzzy based supervisory system. Simulation results are presented and(More)
Nonlinear optical imaging is a powerful method for observing bulk and interfacial phenomena in time and space. Here, we present a step-by-step description of how to carry out second harmonic generation imaging with a kHz amplifier laser system and demonstrate its applicability for SHG microscopy studies of highly size-resolved colloidal CdSe quantum dots(More)
In order to develop an experimental technique to directly monitor the dynamics of activated sludge it is necessary to analyse some parameters that can influence the flocculation process and to find better experimental condition. The effect of sludge concentration, sonication, mixing and of some setup components (i.e. tubes length, T-part) was monitored(More)
Secondary clarification is a crucial unit process in wastewater treatment; the particulate biocatalysts are separated from the clean water by gravitation. Their gravitational settling is highly dependent on the particles' properties such as size, density and permeability. Hence, floc aggregation and disaggregation are essential to consider in the evaluation(More)