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Dive into the research topics where H. De Wever is active.

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Featured researches published by H. De Wever.


Bioresource Technology | 2012

Effect of hydrogen and carbon dioxide on carboxylic acids patterns in mixed culture fermentation

D. Arslan; K.J.J. Steinbusch; Ludo Diels; H. De Wever; Cees J.N. Buisman; H.V.M. Hamelers

This study investigated the carboxylate spectrum from mixed culture fermentation of three organic waste streams after supplying 2 bar hydrogen and carbon dioxide or a mixture of these two gases to the headspace. Under any modified headspace, propionate production was ceased and butyrate, caproate and the total carboxylate concentrations were higher than in the reactors with N(2) headspace (control). Production of one major compound was achieved under hydrogen and carbon dioxide mixed headspace after 4 weeks of incubation. Both the highest acetate concentration (17.4 g COD/l) and the highest fraction (87%) were observed in reactors with mixed hydrogen and carbon dioxide headspace independent of the substrate used. In the control reactor, acetate made up maximum 67% of the total products. For other products, the highest concentration and fraction were seldom observed together. Selective butyrate production reaching a 75% fraction was found under the carbon dioxide headspace on the carbohydrate rich waste.


Critical Reviews in Environmental Science and Technology | 2016

Selective short-chain carboxylates production: A review of control mechanisms to direct mixed culture fermentations

Doga Arslan; K.J.J. Steinbusch; Ludo Diels; H.V.M. Hamelers; David P.B.T.B. Strik; Cees J.N. Buisman; H. De Wever

ABSTRACT Anaerobic digestion of organic residual streams can be directed to produce carboxylates such as acetate, propionate, and n-butyrate, which can be either directly used in industry or converted into other valuable compounds. This paper reviews the studies working with mixed culture conversion of organic substrates toward carboxylates. It draws connections between standard fermentation parameters and the carboxylate product concentrations and composition. The use of more concentrated carbohydrate-rich substrates, at longer residence times and at neutral pH ranges, stimulates total acid production. When increasing pH to the neutral range, acetate and propionate fractions are elevated. High propionate concentrations and fractions are infrequently reported and mainly appear on high-protein-containing feedstock. High n-butyrate fraction >70% is usually found when pH < 6, at longer retention times or organic loading rates, under CO2 atmosphere or on substrates with high lactate concentrations. The review concludes with prospects for further developments related to the carboxylate platform.


Bioresource Technology | 2013

Selective carboxylate production by controlling hydrogen, carbon dioxide and substrate concentrations in mixed culture fermentation.

D. Arslan; K.J.J. Steinbusch; Ludo Diels; H. De Wever; H.V.M. Hamelers; Cees J.N. Buisman

This research demonstrated the selective production of n-butyrate from mixed culture by applying 2 bar carbon dioxide into the headspace of batch fermenters or by increasing the initial substrate concentration. The effect of increasing initial substrate concentration was investigated at 8, 13.5 and 23 g COD/L with potato processing waste stream. Within 1 week of incubation, n-butyrate fraction selectively increased up to 83% by applying 2 bar hydrogen or 78% by applying carbon dioxide into the headspace whereas it was only 59% in the control reactor. Although the fraction of n-butyrate was elevated, the concentration remained lower than in the control. Both the highest concentration and fraction of n-butyrate were observed under the highest initial substrate concentration without headspace addition. The concentration was 10 g COD/L with 73% fraction. The operational conditions obtained from batch experiments for selective n-butyrate production were validated in a continuous process.


Water Science and Technology | 2009

Modelling the degradation of micropollutants in wastewater : parameter estimation and application to pilot (laboratory-scale) MBR data in the case of 2,6-NDSA and BTSA

M. Schönerklee; Momtchil Peev; H. De Wever; Thorsten Reemtsma; Stefan Weiss

The paper summarises the definition of an extended biokinetic model dedicated to micropollutant degradation in wastewater treatment and the parameter estimation methodology for this model. Additionally it describes results on experimental parameter estimation for two target micropollutants, naphthalene disulfonate (2,6-NDSA) and benzothiazole sulfonic acid (BTSA). Subsequently the parameterised model is applied to real operational data from two laboratory-scale (MBR) installations. The work presents the full chain of theoretical model development, model analysis and practical application to case study data for micropollutants.


Water Science and Technology | 2006

Closing the water loop in a maltery: reuse tests at pilot-scale.

H. De Wever; W. Boënne; M. Danau; N. Vanderspiegel; K. Hardy; J. Limbos

This paper reports on the potential for water reuse in the malting sector. Core unit of a treatment train to close the water loop was a membrane bioreactor (MBR). We compared three different commercial submerged membranes for their fouling potential in this application and related this to the presence of extracellular polymeric substances (EPS). In a second step, we subjected MBR permeate to reverse osmosis and several (advanced) oxidation processes to evaluate the water quality achieved. Finally we performed a set of water reuse tests with waters obtained through different scenarios. The optimal scenario was then tested in a closed water loop over several malting cycles at pilot scale and the effect on water and malt quality was investigated.


Journal of Membrane Science | 2008

A new method for the evaluation of the reversible and irreversible fouling propensity of MBR mixed liquor

E. Brauns; E. Van Hoof; H. De Wever


Water Science and Technology | 2004

Removal of persistent polar pollutants through improved treatment of wastewater effluents (P-THREE)

Thomas P. Knepper; Damià Barceló; Klaus Lindner; P. Seel; Thorsten Reemtsma; F. Ventura; H. De Wever; E. van der Voet; P. Gehringer; M. Schönerklee


Water Science and Technology | 2004

Comparison of linear alkylbenzene sulfonates removal in conventional activated sludge systems and membrane bioreactors

H. De Wever; S Van Roy; Chris Dotremont; Jutta Müller; Thomas P. Knepper


Water Science and Technology | 2007

Recalcitrant COD degradation by an integrated system of ozonation and membrane bioreactor

K. Gommers; H. De Wever; E. Brauns; K. Peys


Water Science and Technology | 2004

Modelling the degradation of low concentration pollutants in membrane bioreactors

Momtchil Peev; M. Schönerklee; H. De Wever

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E. Brauns

Flemish Institute for Technological Research

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Karolien Vanbroekhoven

Flemish Institute for Technological Research

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Ludo Diels

Flemish Institute for Technological Research

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W. Van Hecke

Flemish Institute for Technological Research

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Cees J.N. Buisman

Wageningen University and Research Centre

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Chris Dotremont

Flemish Institute for Technological Research

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E. Van Hoof

Flemish Institute for Technological Research

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H.V.M. Hamelers

Wageningen University and Research Centre

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K.J.J. Steinbusch

Wageningen University and Research Centre

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Deepak Pant

Flemish Institute for Technological Research

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