References of "Fraikin, Laurent"
     in
Bookmark and Share    
Full Text
Peer Reviewed
See detailEVOLUTION OF SLUDGE INTERNAL STRUCTURE DURING DRYING: EFFECT OF THE CONDITIONING CONDITIONS
Fraikin, Laurent ULg; Pambou, Yvon-Bert; Salmon, Thierry ULg et al

Conference (2017, July 07)

This paper investigated the influence of dual conditioning of waste water treatment sludge on the evolution of sludge internal structure during convective drying. Results showed clearly an impact of ... [more ▼]

This paper investigated the influence of dual conditioning of waste water treatment sludge on the evolution of sludge internal structure during convective drying. Results showed clearly an impact of chemical conditioners on the evolution of the created porosity. For sludge flocculated by single conditioning, a centered porosity delimited by an external crust was shown, while for dual conditioning, a porosity structured in lamellae, was identified. [less ▲]

Detailed reference viewed: 18 (1 ULg)
Full Text
See detailSTUDY OF ACTIVATED SLUDGE DEWATERING : USING BIOBASED COAGULANTS
Fraikin, Laurent ULg; Clermont, Quentin; Salmon, Thierry ULg et al

Poster (2017, July 06)

This paper focuses on the dewatering efficiency of activated sludge from waste water treatment plant using biobased coagulants in addition with classical flocculant and compares the results with those ... [more ▼]

This paper focuses on the dewatering efficiency of activated sludge from waste water treatment plant using biobased coagulants in addition with classical flocculant and compares the results with those obtained with a sole classical coagulant. For this work, a standard compression-expression cell is used and an experimental design is develop to highlight the effect of the biobased coagulants. [less ▲]

Detailed reference viewed: 26 (1 ULg)
Full Text
See detailImpact of conditioning on sludge internal structure evolution during drying
Fraikin, Laurent ULg; Pambou, Yvon Bert; Salmon, Thierry ULg et al

Conference (2017, June 20)

This paper investigated the influence of dual conditioning of waste water treatment sludge on the evolution of sludge internal structure during convective drying. Results showed clearly an impact of ... [more ▼]

This paper investigated the influence of dual conditioning of waste water treatment sludge on the evolution of sludge internal structure during convective drying. Results showed clearly an impact of chemical conditioners on the evolution of the created porosity. For sludge flocculated by single conditioning, a centered porosity delimiting by external crust was shown, while for dual conditioning, a porosity structured in lamellae, was identified. [less ▲]

Detailed reference viewed: 8 (0 ULg)
Full Text
See detailSTUDY ON THE STRUCTURAL EVOLUTION OF SEWAGE SLUDGE DURING CONVECTIVE DRYING
Li, Jie; Fraikin, Laurent ULg; Salmon, Thierry ULg et al

Poster (2017, June 19)

The structure of the sludge sample continues changing during drying as a result of the shrinkage phenomenon. Then the exchange area becomes smaller and the drying rate decreases. The sludge collected in a ... [more ▼]

The structure of the sludge sample continues changing during drying as a result of the shrinkage phenomenon. Then the exchange area becomes smaller and the drying rate decreases. The sludge collected in a wastewater treatment plant (Grosses Battes WWTP, Belgium) was chosen for both lab-scale experiment and pilot-scale experiment. X-ray macrotomography (resolution: 0.36 mm per pixel) and X-ray microtomography (resolution: 41 μm per pixel) were used to explore the structure evolution of the sludge bed and the single extrudate respectively. 2D cross-sections of the sludge bed and the single extrudate were acquired, which supply a convenient way to investigate the evolution of the structure. The results show that the structure of both the sludge bed and the single extrudate distinctly changes during the drying process. [less ▲]

Detailed reference viewed: 13 (0 ULg)
Full Text
See detailDEVELOPMENT OF A MULTISCALE CONVECTIVE LABSCALE DRYER
Fraikin, Laurent ULg; Salmon, Thierry ULg; Léonard, Angélique ULg

Poster (2017, June 19)

The convective drying technology is currently used in many industries but the industrial process is frequently poorly mastered and some design security factors are used. The lack of optimized conception ... [more ▼]

The convective drying technology is currently used in many industries but the industrial process is frequently poorly mastered and some design security factors are used. The lack of optimized conception rules lead to large energy consumptions. In the same perspective, the use of superheated steam as drying fluid expands and requests the improvement of the knowledge about this specific drying process. For this goal, the PEP’s developed a new convective labscale dryer to conduct various studies. This article presents the new dryer called VESAC. [less ▲]

Detailed reference viewed: 36 (0 ULg)
Full Text
Peer Reviewed
See detailDrying recycled fiber rejects in a bench-scale cyclone: Influence of device geometry and operational parameters on drying mechanisms
Grimm, Alejandro; Elustondo, Diego; Mäkelä, Mikko et al

in Fuel Processing Technology (2017), 167

Abstract Significant amounts of waste sludge and rejects are generated by pulp and paper mills, and stricter environmental regulations have made waste handling a global challenge. Thermochemical ... [more ▼]

Abstract Significant amounts of waste sludge and rejects are generated by pulp and paper mills, and stricter environmental regulations have made waste handling a global challenge. Thermochemical conversion of mechanically dewatered by-products is expensive and inefficient due to their high moisture content; therefore drying is a vital unit operation in waste management. This paper reports results from drying of light coarse fiber reject in a bench-scale cyclone that allows changes in geometry. For the sake of comparison, convective fixed-bed drying tests were also performed. The results showed that the drying rate in the cyclone was hundreds of times higher than in the fixed-bed. For cyclone drying, the inlet air velocity was the most important factor in both determining the drying rate and residence time of the material. This led to the hypothesis that grinding of the reject particles due to particle-wall and particle-particle collisions play a crucial role in enhancing the efficiency of heat and mass transfer. In addition to inlet air velocity, cyclone geometry was the main factor that determined particle residence time, as drying air temperature mainly determined drying rate. [less ▲]

Detailed reference viewed: 29 (7 ULg)
Full Text
Peer Reviewed
See detailInfluence of sawdust addition on drying of wastewater sludges: Comparison of structural characteristics
Li, Jie; Plougonven, Erwan ULg; Fraikin, Laurent ULg et al

in Drying Technology (2017), 35(8), 925-932

Detailed reference viewed: 29 (6 ULg)
Full Text
Peer Reviewed
See detailMEASUREMENT OF MOISTURE DIFFUSIVITY BY INVESTIGATION OF SORPTION ISOTHERM AND MODELING MOISTURE TRANSFER OF MORTAR SUBMITED TO CONVECTIVE DRYING
Kahlerras, Loubna ULg; BELHAMRI, Azeddine; Fraikin, Laurent ULg et al

in Proceedings of The 20th International Drying Symposium (IDS 2016) (2016, August 08)

This work reports the results of experimental study concerning convective drying of cement mortar and the influence of water-to cement ratios (W/C) used for the preparation of mortar, on moisture changes ... [more ▼]

This work reports the results of experimental study concerning convective drying of cement mortar and the influence of water-to cement ratios (W/C) used for the preparation of mortar, on moisture changes. The first experimental campaign was a convective dryer; in the purpose to obtain the drying curves of mortar and the influence of water to cement ratios (W/C) on drying kinetics. A second experimental campaign aims to characterize from textural and hydric point of view, the materials, by mean of DVS (dynamic vapor sorption) In order to obtain sorption cycles and identify the moisture diffusivity coefficient of mortar. The pore size distribution is obtained from sorption cycles and completed by MIP. The contribution of each components of the microstructure to the diffusion is studied. Finally X-ray microtomography is used to measuring the moisture content in the internal structure of mortars during drying. [less ▲]

Detailed reference viewed: 41 (9 ULg)
Full Text
Peer Reviewed
See detailConvective drying of cherry tomato: Study of skin effect
Khama, Reda; Aissani, F.; Alkama, R. et al

in Journal of Engineering Science and Technology (2016), 11(3), 443-457

Detailed reference viewed: 29 (4 ULg)
Full Text
Peer Reviewed
See detailExperimental Comparative Study on Lithium Chloride and Calcium Chloride Desiccants
Bouzenada, Saliha ULg; Kaabi, A. N.; Fraikin, Laurent ULg et al

in Procedia Computer Science (2016), 83(718-725),

Detailed reference viewed: 17 (3 ULg)
Full Text
Peer Reviewed
See detailPositive Operations on Wastewater Sludge Drying: Comparison of Back-Mixing and Sawdust Addition
Li, Jie; Plougonven, Erwan ULg; Fraikin, Laurent ULg et al

in Energy & Fuels (2016), 30(4), 3014-3019

Detailed reference viewed: 31 (4 ULg)
Peer Reviewed
See detailConvective drying behavior of sawdust-sludge mixtures in a fixed bed
Li, Jie; Fraikin, Laurent ULg; Salmon, Thierry ULg et al

in Drying Technology (2016), 34(4), 395-402

Detailed reference viewed: 37 (9 ULg)
Peer Reviewed
See detailSludge dewatering and drying: about the difficulty of making experiments with a non-stabilized material
Pambou, Yvon-Bert ULg; Fraikin, Laurent ULg; Salmon, Thierry ULg et al

in Desalination and Water Treatment (2016), 57(30), 13841-13856

Detailed reference viewed: 115 (10 ULg)
Full Text
Peer Reviewed
See detailForced Convective Drying of Wastewater Sludge with Presentation of Exergy Analysis of the Dryer
Bennamoun, Lyes; Fraikin, Laurent ULg; Li, Jie et al

in Chemical Engineering Communications (2016), 203

The main objective is studying the fundamental aspect, by the mean of the drying kinetics, the application of forced convective drying of wastewater sludge with determination of the optimum drying ... [more ▼]

The main objective is studying the fundamental aspect, by the mean of the drying kinetics, the application of forced convective drying of wastewater sludge with determination of the optimum drying conditions. The drying system is composed of two units; small samples of 2.5 g are dried in the first unit and bed of sludge weighting 250 g is dried the second unit. The experiments are performed under air temperatures varying between 80°C and 200°C. The range of the air velocity and its humidity is 1- 2 m/s and 0.005- 0.05 kgwater/kgdry air, respectively. The experiments are performed for two different sludges; activated sludge (AS) and thermalized and digested sludge (TDS). Usually, three main drying phases are observed during drying of bed of sludge. These phases are reduced to only two for small samples. Determination of the influent parameters shows that temperature of the drying air and sludge origin can profoundly influence the drying kinetic of the sludge. The exergy analysis of the two units of the drying system allows selecting 140 °C, 2 m/s, 0.05 kgwater/kgdry air as optimum drying condition with an exergy efficiency reaching 90\%. [less ▲]

Detailed reference viewed: 38 (2 ULg)
Full Text
Peer Reviewed
See detailETUDE DE LA MICROSTRUCTURE DU MORTIER DE CIMENT A TRAVERS LES COURBES DE SORPTION
Kahlerras, Loubna ULg; Belhamri, Azeddine; Fraikin, Laurent ULg et al

in kahlerras, loubna (Ed.) Proceedings du séminaire International sur le Génie Climatique et l’Energétique, SIGCLE’2015 (2015, November 09)

La présente étude se focalise sur l’étude à travers les courbes de sorption de vapeur d’eau du comportement hydrique du mortier de ciment. Les expériences sont effectuées sur trois types de mortiers dont ... [more ▼]

La présente étude se focalise sur l’étude à travers les courbes de sorption de vapeur d’eau du comportement hydrique du mortier de ciment. Les expériences sont effectuées sur trois types de mortiers dont la seule différence est dans le rapport eau/ciment (E/C = 0,4, 0,5 et 0,6) afin d’étudier l’influence de ce rapport sur la microstructure du matériau. La méthode dynamique est utilisée pour l’obtention des isothermes de sorption en utilisant le « DVS (dynamic vapour sorption) Des échantillons en forme de concassât de quelques millimètres de diamètre sont utilisés, l’étude est complété par la porosité à mercure. Deux principaux modes poreux sont déterminés. [less ▲]

Detailed reference viewed: 32 (5 ULg)
Full Text
Peer Reviewed
See detailUSING OF AN EXPERIMENTAL DESIGN TO CHARACTERIZE THE CONVECTIVE DRYING BEHAVIOR OF DIFFERENT SLUDGES
Fraikin, Laurent ULg; Salmon, Thierry ULg; Herbreteau, Benjamin et al

in Drying Technology (2015, August 18), 33(11), 1302-1308

Drying appears as a major step prior to valorization of sludge from wastewater treatment plant. This study uses an experimental design on different sludges to highlight the drying behavior according to ... [more ▼]

Drying appears as a major step prior to valorization of sludge from wastewater treatment plant. This study uses an experimental design on different sludges to highlight the drying behavior according to drying conditions, storage and extrusion. This research is performed with industrial view, but on a single cylinder sample, and focuses on five responds: maximum drying flux, time to reach 95% of dry matter, final volume, critical moisture and slowing-down coefficient. [less ▲]

Detailed reference viewed: 63 (7 ULg)
Full Text
Peer Reviewed
See detailMultiscale structure characterization of sawdust-waste water sludge extrudates dried in a pilot-scale fixed bed
Li, Jie ULg; Plougonven, Erwan ULg; Fraikin, Laurent ULg et al

in Biomass and Bioenergy (2015), 81(0), 98-107

Abstract Convective drying of waste water sludge and sawdust-sludge mixtures in a pilot-scale fixed bed was studied. Drying was performed in a cross-flow convective dryer using 500 g of wet material ... [more ▼]

Abstract Convective drying of waste water sludge and sawdust-sludge mixtures in a pilot-scale fixed bed was studied. Drying was performed in a cross-flow convective dryer using 500 g of wet material extruded through a disk with circular dies 12 mm in diameter. The structure of the bed mainly shows volume shrinkage and crack formation during drying. Several characterization techniques were used over a wide range of scales from nm up to mm. The overall bed structure was imaged with X-ray macrotomography, at a resolution of 0.36 mm per pixel. Single extrudates were scanned with X-ray microtomography, at a resolution of 41 μm per pixel. Pore structure of the dried samples were characterized by mercury porosimetry (7.5 nm < dp < 150 μm). Results show significant structural changes on all scales with increasing amounts of sawdust: shrinkage decreases, crack formation increases, and the pores become larger. This confirms the benefits of sawdust addition for sludge drying applications. [less ▲]

Detailed reference viewed: 30 (10 ULg)
Full Text
Peer Reviewed
See detailOn Water Transfer and Hydraulic Connection Layer During the Convective Drying of Rigid Porous Material
Prime, Noémie; Housni, Z; Fraikin, Laurent ULg et al

in Transport in Porous Media (2015), 106(1), 47-72

The convective drying of a natural porous material, limestone, is investigated in this study, with both experimental and numerical approaches. The first experimental campaign, which focuses on the ... [more ▼]

The convective drying of a natural porous material, limestone, is investigated in this study, with both experimental and numerical approaches. The first experimental campaign, which focuses on the influence of samples’ slenderness, suggests the presence of a hydraulic connection layer between the porous water and the external environment, in spite of the very fine pore structure of the material. This hydraulic transfer enables the fast water evaporation at the beginning of the drying test, when external conditions drive the kinetics. Furthermore, the results show that this layer does not exceed 30 mm deep from the external surface, given the drying conditions of the test. A second experimental campaign aims to analyse, by mean of an X-ray tomography tool, the internal water content during the drying. It confirms that water transfer takes place within the limestone in two distinct stages. The first stage being faster than the second one with a homogeneous desaturation along the sample, it is consistent with the hypothesis of the hydraulic connection layer. Finally, the finite element modelling makes possible to identify the main mechanisms of water transfer, namely liquid convection and vapour diffusion. © 2014, Springer Science+Business Media Dordrecht [less ▲]

Detailed reference viewed: 22 (2 ULg)