H.M. van Veldhuizen

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Citations (90)

Respirometric measurement of kinetic parameters: effect of activated sludge floc size

Water Science & Technology (2003)

Khim Hoong Chu H.M. van Veldhuizen Mark C.M. van Loosdrecht

The variation of activated sludge floc size with the mixing intensity of a mechanically stirred respirometer, expressed in terms of the mean energy dissipation rate, was characterized using a photometric dispersion analyzer. The floc size decreased rapidly when the energy dissipation rate was increased from 1.33 x 10(-3) to 2.68 x 10(-3) W/kg. Experiments were performed to investigate the effect of floc size on the oxygen saturation coefficient measured under the condition of acetate oxidation. The respirometric data were interpreted by considering only the kinetics of biochemical reactions. The variation of the oxygen saturation coefficient with mixing intensity was found to correlate with the variation of floc size with mixing intensity. The oxygen saturation coefficient was found to decrease from 0.23 to 0.08 mg/L when the mean energy dissipation rate was increased from 1.33 x 10(-3) to 2.68 x 10(-3) W/kg. The dependence of the oxygen saturation coefficient on floc size or mixing intensity suggests the presence of mass transfer resistances in large flocs.

Respirometer

Saturation (graph theory)

Respirometry

Intensity

Coefficient of variation

Mass transfer coefficient

10.2166/wst.2003.0453

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Citations (46)

Model based evaluation of plant improvement strategies for biological nutrient removal

Water Science & Technology (1999)

H.M. van Veldhuizen Mark C.M. van Loosdrecht F. A. Brandse

An activated sludge model for biological N- and P-removal was developed, which describes anoxic and aerobic P-uptake based on bacterial metabolism. This model was tested in practice on two wastewater treatment plants, which are BCFS®-processes, which contain activated sludge with a high fraction of denitrifying P-removing bacteria (DPB's). The model appeared to be able to give an adequate description of the performance of these treatment plants under different conditions. If the process parameters are well defined almost no calibration of the biokinetic parameters was necessary. In the simulation of Dalfsen wwtp, which has a complex control scheme, it was possible to give an adequate simulation of the control actions and the concentration profiles in a rather simple way, showing that detailed simulation of these controllers was not necessary. With the calibrated model it was possible to analyse bottlenecks and give suggestions for upgrading of the concerned treatments plants. The simulation results were used in decisions on investments.

Activated sludge model

10.2166/wst.1999.0188

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Citations (2)

Heteropoly anion on carbon: characterization and use in 2,3,6-trimethylphenol oxidation

Journal of Molecular Catalysis A Chemical (1996)

Reinier J. Jansen H.M. van Veldhuizen H. van Bekkum

Carbon fibers

10.1016/1381-1169(95)00173-5

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Citations (18)

Full-Scale Experience with the Sharon Process through the Eyes of the Operators

Proceedings of the Water Environment Federation (2006)

Jan‐Willem Mulder J.O.J. Duin J. Goverde W.G. Poiesz H.M. van Veldhuizen

Full-Scale Experience with the Sharon Process through the Eyes of the OperatorsThis paper summarizes different operating aspects and experiences of several SHARON plants. The SHARON process is suitable for treatment of high strength ammonia wastewaters such as reject water from dewatering of digested sewage sludge and wastewater from sludge drying or incineration plants. The aerated retention time and nitrite concentration are the two most important process parameters to...Author(s)J.W. MulderJ.O.J. DuinJ. GoverdeW.G. PoieszH.M. van VeldhuizenR. van KempenP. RoeleveldSourceProceedings of the Water Environment FederationSubjectSession 67: Municipal Wastewater Treatment Processes: Side-Stream Treatment of NRich Sludge Return Liquors – A Bounty of Full-Scale Proven TechnologiesDocument typeConference PaperPublisherWater Environment FederationPrint publication date Jan, 2006ISSN1938-6478SICI1938-6478(20060101)2006:7L.5256;1-DOI10.2175/193864706783763444Volume / Issue2006 / 7Content sourceWEFTECFirst / last page(s)5256 - 5270Copyright2006Word count206

Full scale

Dewatering

10.2175/193864706783763444

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Citations (18)

ChemInform Abstract: Recent (1987‐1993) Developments in Heteropolyacid Catalysts in Acid‐ Catalyzed Reactions and Oxidation Catalysis

ChemInform (1994)

Reinier J. Jansen H.M. van Veldhuizen M.A. Schwegler H. van Bekkum

Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

10.1002/chin.199435301

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Model based evaluation of plant improvement strategies for biological nutrient removal

Water Science & Technology (1999)

H.M. van Veldhuizen Mark C.M. van Loosdrecht F. A. Brandse

An activated sludge model for biological N- and P-removal was developed, which describes anoxic and aerobic P-uptake based on bacterial metabolism. This model was tested in practice on two wastewater treatment plants, which are BCFS®-processes, which contain activated sludge with a high fraction of denitrifying P-removing bacteria (DPB's). The model appeared to be able to give an adequate description of the performance of these treatment plants under different conditions. If the process parameters are well defined almost no calibration of the biokinetic parameters was necessary. In the simulation of Dalfsen wwtp, which has a complex control scheme, it was possible to give an adequate simulation of the control actions and the concentration profiles in a rather simple way, showing that detailed simulation of these controllers was not necessary. With the calibrated model it was possible to analyse bottlenecks and give suggestions for upgrading of the concerned treatments plants. The simulation results were used in decisions on investments.

10.1016/s0273-1223(99)00052-9

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Citations (10)

H.M. van Veldhuizen

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