H. De Wever
Flemish Institute for Technological Research
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Featured researches published by H. De Wever.
Bioresource Technology | 2012
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
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
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
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
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
E. Brauns; E. Van Hoof; H. De Wever
Water Science and Technology | 2004
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
H. De Wever; S Van Roy; Chris Dotremont; Jutta Müller; Thomas P. Knepper
Water Science and Technology | 2007
K. Gommers; H. De Wever; E. Brauns; K. Peys
Water Science and Technology | 2004
Momtchil Peev; M. Schönerklee; H. De Wever