Search results for: Raf Dewil

Items from 1 to 20 out of 52 results

article

Unraveling the Presence and Positions of Nitrogen Defects in Defective g‐C₃N₄ for Improved Organic Photocatalytic Degradation: Insights from Experiments and Theoretical Calculations

Yong Liu, Xiaochuan Chen, Mohammadreza Kamali, Barbara Rossi, more

Advanced Functional Materials > 34 > 40 > n/a - n/a

In this work, nitrogen‐defective g‐C₃N₄ with different nitrogen defect densities is synthesized for ciprofloxacin photocatalytic degradation. Compared with pristine g‐C₃N₄, g‐C₃N₄ etched with NaBH₄ for 1 h exhibits an approximately ten‐fold increase in the rate constant of ciprofloxacin (CIP) degradation. The combined experimental analysis and theoretical calculations reveal that nitrogen defects...

article

Adsorption of reactive dyes and their mixtures on activated carbon. Kinetics, equilibrium and thermodynamic evaluation

Meriem Kouhail, Zakia Elahmadi, Abbes Benayada, Raf Dewil

Environment Protection Engineering > 2020 > Vol. 46, nr 2 > 5--24

The adsorption of three reactive dyes (Reactive Bezactiv Yellow (RBY), Reactive Bezactiv Blue (RBB) and Reactive Bezactiv (RBR)) on a commercially available activated carbon (CAC) has been evaluated. It was shown that CAC is capable to effectively remove these dyes from a solution. The adsorption increased with higher contact time, adsorbent dose, and initial dye concentration. The data indicated...

article

Effects of process variables and kinetics on the degradation of 2,4-dichlorophenol using advanced reduction processes (ARP)

Xingyue Yu, Deirdre Cabooter, Raf Dewil

Journal of Hazardous Materials > 2018 > 357 > C > 81-88

This study aims at investigating the efficiency and kinetics of 2,4-DCP degradation via advanced reduction processes (ARP). Using UV light as activation method, the highest degradation efficiency of 2,4-DCP was obtained when using sulphite as a reducing agent. The highest degradation efficiency was observed under alkaline conditions (pH = 10.0), for high sulphite dosage and UV intensity, and low 2,4-DCP...

article

Decolorization of reactive azo dyes using a sequential chemical and activated sludge treatment

Ken Meerbergen, Sam Crauwels, Kris A. Willems, Raf Dewil, more

Journal of Bioscience and Bioengineering > 2017 > 124 > 6 > 668-673

Textile wastewater contains high concentrations of organic substances derived from diverse dyes and auxiliary chemicals, some of which are non-biodegradable and/or toxic. Therefore, it is essential that textile wastewater is treated and that these substances are removed before being discharged into the environment. A combination of advanced oxidation processes (AOPs) to obtain partial dye degradation...

article

Environmental management as a pillar for sustainable development

Hrvoje Mikulčić, Neven Duić, Raf Dewil

Journal of Environmental Management > 2017 > 203 > P3 > 867-871

There is a growing concern about how to minimize the impact of human activities on the environment. Already nowadays, in some places adaptation efforts are needed in order to avoid the irreversibility of negative human activities. Due to climate changes, and corresponding environmental and social changes, there is a great need for a more sustainable development of mankind. Over the years, research...

article

Evaluation of the effects of low energetic microwave irradiation on anaerobic digestion

Bert Bastiaens, Rob Van den Broeck, Lise Appels, Raf Dewil

Journal of Environmental Management > 2017 > 202 > P1 > 69-83

The present study investigates the effects of microwave irradiation on the performance of anaerobic digestion processes. A first set of experiments is performed to distinguish the upper limit of the applied energy levels. Secondly, the effects of these treatments on the performance of the digestion process are evaluated in 3 experimental setups: (i) monitoring the acetic acid degradation, (ii) performing...

article

Comparing glow discharge plasma and ultrasound treatment for improving aerobic respiration of activated sludge

Nina Van de Moortel, Rob Van den Broeck, Jan Degrève, Raf Dewil

Water Research > 2017 > 122 > C > 207-215

In this paper, a new and innovative technique, glow discharge plasma, is introduced for the treatment of activated sludge, whereby its effect on sludge solubilization, settleability, floc structure and biomass activity for carbon removal and nitrification is investigated. The obtained results are compared to the use of ultrasound for activated sludge treatment, a technique known for its potential...

article

A pilot-scale coupling of ozonation and biodegradation of 2,4-dichlorophenol-containing wastewater: The effect of biomass acclimation towards chlorophenol and intermediate ozonation products

Pieter Van Aken, Rob Van den Broeck, Jan Degrève, Raf Dewil

Journal of Cleaner Production > 2017 > 161 > C > 1432-1441

The effect of pre-ozonation of a synthetic wastewater spiked with 2,4-dichlorophenol prior to a biological treatment was investigated experimentally by using a pilot-scale bioreactor. The pre-ozonated wastewater was characterized by a brown color, probably due to the formation of typical intermediate products such as quinones or their derivatives. Because also under steady conditions a brown effluent...

article

New perspectives for Advanced Oxidation Processes

Raf Dewil, Dionissios Mantzavinos, Ioannis Poulios, Manuel A. Rodrigo

Journal of Environmental Management > 2017 > 195 > P2 > 93-99

Advanced Oxidation Processes (AOPs) are called to fill the gap between the treatability attained by conventional physico-chemical and biological treatments and the day-to-day more exigent limits fixed by environmental regulations. They are particularly important for the removal of anthropogenic pollutants and for this reason, they have been widely investigated in the last decades and even applied...

article

Selective electrochemical degradation of 4-chlorophenol at a Ti/RuO2-IrO2 anode in chloride rich wastewater

Jonas De Coster, Wouter Vanherck, Lise Appels, Raf Dewil

Journal of Environmental Management > 2017 > 190 > C > 61-71

The electrochemical degradation of 4-chlorophenol (4-CP) in the presence of chlorides by the use of a Ti/RuO₂-IrO₂ anode was investigated under different operational parameters such as applied current density (J) and chloride concentration ([NaCl]). By performing a design of experiments, a model for the removal of 4-chlorophenol under these circumstances was obtained. To investigate matrix effects...

article

Chemo-enzymatic epoxidation of Sapindus mukurossi fatty acids catalyzed with Candida sp. 99–125 lipase in a solvent-free system

Xin Zhang, Xiaohong Wan, Hao Cao, Raf Dewil, more

Industrial Crops and Products > 2017 > 98 > C > 10-18

The non-edible Sapindus mukurossi oil, containing more than 80% unsaturated fatty acids, has potential applications in plastics manufacturing. In this research, a green and economically attractive chemo-enzymatic production of epoxidized fatty acids was performed in the presence of lipase Candida sp. 99–125 and H₂O₂ in different systems. The obtained experimental results demonstrated that the solvent-free...

article

Production of Levulinic Acid and Furfural by Microwave-Assisted Hydrolysis from Model Compounds: Effect of Temperature, Acid Concentration and Reaction Time

Nick Sweygers, Raf Dewil, Lise Appels

Waste and Biomass Valorization > 2018 > 9 > 3 > 343-355

In this study a system for the production of levulinic acid and furfural from lignocellulosic polysaccharides was investigated using cellulose and xylan as model compounds. The goal was to determine the optimum process conditions for a dilute acid hydrolysis of cellulose and xylan to levulinic acid and furfural, respectively. The yields of levulinic acid and furfural were investigated by optimization...

article

The production of bio-energy by microbial (biogas through anaerobic digestion) or thermal (pyrolysis) processes

Jan Baeyens, Lise Appels, Liyu Peng, Raf Dewil

Renewable Energy > 2016 > 96 > PB > 1055

article

Editorial by new Editors-in-Chief

Raf Dewil, Jason Evans, Berrin Tansel

Journal of Environmental Management > 2016 > 172 > C > 127-128

article

Microwave and ultrasound pre-treatments influence microbial community structure and digester performance in anaerobic digestion of waste activated sludge

Maria Westerholm, Sam Crauwels, Maarten Van Geel, Raf Dewil, more

Applied Microbiology and Biotechnology > 2016 > 100 > 12 > 5339-5352

Comparative analyses of bacterial and archaeal community structures and dynamics in three biogas digesters during start-up and subsequent operation using microwaved, ultrasonicated or untreated waste activated sludge were performed based on 454 pyrosequencing datasets of part of 16S ribosomal RNA sequences and quantitative PCR. The pre-treatment increased the solubility, and thus the availability...

article

The effect of ozonation on the toxicity and biodegradability of 2,4-dichlorophenol-containing wastewater

Pieter Van Aken, Rob Van den Broeck, Jan Degrève, Raf Dewil

Chemical Engineering Journal > 2015 > 280 > Complete > 728-736

The ozone degradation of 2,4-dichlorophenol (2,4-DCP), as toxic model pollutant in wastewater, is investigated in the presence of readily biodegradable substrates. Since a successful treatment does not only depend on the elimination of the toxic compound, a proper assessment of the residual toxicity and/or biodegradability of the ozonated wastewater is necessary. Respirometry is used to evaluate the...

article

High-resolution MS and MSn investigation of ozone oxidation products from phenazone-type pharmaceuticals and metabolites

Maxime Favier, Raf Dewil, Kwinten Van Eyck, Ann Van Schepdael, more

Chemosphere > 2015 > 136 > C > 32-41

Phenazone-type pharmaceuticals, such as aminopyrine, metamizole, phenazone and propyphenazone, are widely used analgesics that have been detected in wastewater treatment plant effluents in μgL⁻¹ concentrations. Acetamido antipyrine (AAA) and formyl aminoantipyrine (FAA) – the main metabolites of aminopyrine and metamizole – have also been detected in sub μgL⁻¹ concentrations in environmental water...

article

Hybrid operation of the bio-ethanol fermentation

Qian Kang, Bart Van der Bruggen, Raf Dewil, Jan Baeyens, more

Separation and Purification Technology > 2015 > 149 > Complete > 322-330

Bio-ethanol is a clean and renewable fuel of increasing importance. It is biochemically produced by fermentation of different feedstock in an aqueous broth. Its purification is generally achieved by distillation (till the water/ethanol azeotropic mixture of ∼95wt% ethanol is reached), followed by molecular sieve or membrane dehydration to obtain anhydrous ethanol. Drawbacks of the current production...

article

Energy potential for combustion and anaerobic digestion of biomass from low‐input high‐diversity systems in conservation areas

Koenraad Van Meerbeek, Lise Appels, Raf Dewil, Jonathan Van Beek, more

GCB Bioenergy > 7 > 4 > 888 - 898

In this study, we assessed the potential for bioenergy production of Low‐Input High‐Diversity (LIHD) systems in temperate West‐European conservation areas. A wide range of seminatural ecosystems (wet and dry grasslands, marshes, tall‐herb vegetation and heathlands) was sampled. Because LIHD biomass is often scattered and discontinuously available, we only considered the potential for anaerobic digestion...

article

Siloxane removal and sludge disintegration using thermo-alkaline treatments with air stripping prior to anaerobic sludge digestion

Kazuyuki Oshita, Motochika Fujime, Masaki Takaoka, Takashi Fujimori, more

Energy Conversion and Management > 2015 > 96 > Complete > 384-391

A thermo-alkaline treatment with air stripping was applied before anaerobic sludge digestion for both siloxane removal and sludge disintegration. The treatment was expected to increase the amount of biogas produced and to reduce the amount of siloxane in the gas. Adding sodium hydroxide (NaOH) to the sludge improved the removal of siloxane from the sludge, with approximately 90% of the siloxane removed...

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INFONA - science communication portal

Search results for: Raf Dewil

Unraveling the Presence and Positions of Nitrogen Defects in Defective g‐C₃N₄ for Improved Organic Photocatalytic Degradation: Insights from Experiments and Theoretical Calculations

Adsorption of reactive dyes and their mixtures on activated carbon. Kinetics, equilibrium and thermodynamic evaluation

Effects of process variables and kinetics on the degradation of 2,4-dichlorophenol using advanced reduction processes (ARP)

Decolorization of reactive azo dyes using a sequential chemical and activated sludge treatment

Environmental management as a pillar for sustainable development

Evaluation of the effects of low energetic microwave irradiation on anaerobic digestion

Comparing glow discharge plasma and ultrasound treatment for improving aerobic respiration of activated sludge

A pilot-scale coupling of ozonation and biodegradation of 2,4-dichlorophenol-containing wastewater: The effect of biomass acclimation towards chlorophenol and intermediate ozonation products

New perspectives for Advanced Oxidation Processes

Selective electrochemical degradation of 4-chlorophenol at a Ti/RuO2-IrO2 anode in chloride rich wastewater

Chemo-enzymatic epoxidation of Sapindus mukurossi fatty acids catalyzed with Candida sp. 99–125 lipase in a solvent-free system

Production of Levulinic Acid and Furfural by Microwave-Assisted Hydrolysis from Model Compounds: Effect of Temperature, Acid Concentration and Reaction Time

The production of bio-energy by microbial (biogas through anaerobic digestion) or thermal (pyrolysis) processes

Editorial by new Editors-in-Chief

Microwave and ultrasound pre-treatments influence microbial community structure and digester performance in anaerobic digestion of waste activated sludge

The effect of ozonation on the toxicity and biodegradability of 2,4-dichlorophenol-containing wastewater

High-resolution MS and MSn investigation of ozone oxidation products from phenazone-type pharmaceuticals and metabolites

Hybrid operation of the bio-ethanol fermentation

Energy potential for combustion and anaerobic digestion of biomass from low‐input high‐diversity systems in conservation areas

Siloxane removal and sludge disintegration using thermo-alkaline treatments with air stripping prior to anaerobic sludge digestion

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