References of "Aldric, Jean-Marc"
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See detailPotentialités d’application des technologies biologiques pour la depollution des sols en Wallonie
Aldric, Jean-Marc ULg; Druart, P.; Maesen, Philippe ULg et al

in Journal des Ingénieurs (Le) (2011), 132

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See detailThe use of Macronet resins to recover decalactone produced by Rhodotorula aurantiaca from the culture broth
Alchihab, Mohamed ULg; Aldric, Jean-Marc ULg; Aguedo, Mario ULg et al

in Journal of Industrial Microbiology & Biotechnology (2010), 37(2), 167-172

During the biotransformation of castor oil into -decalactone, R. aurantiaca produced both the lactone form and its precursor (4-hydroxydecanoic acid). After six days of culture, a maximum yield of ... [more ▼]

During the biotransformation of castor oil into -decalactone, R. aurantiaca produced both the lactone form and its precursor (4-hydroxydecanoic acid). After six days of culture, a maximum yield of -decalactone of 6.5 g/l was obtained. The parameters of -decalactone adsorption on three Macronet resins (MN-202, MN-102 and MN-100) were investigated in water. Adsorption isotherms of -decalactone for the three Macronet resins were linear. The trapping of -decalactone produced by R. aurantiaca on these resins was then carried out. -Decalactone was eVectively retained by all the studied Macronet resins. The resin MN-202 trapped -decalactone more eYciently than MN-102 and MN-100. The percentages of -decalactone adsorbed on the resins MN-202, MN-102 and MN-100 were, respectively, 85, 75 and 81%, whereas around 70% of the adsorbed -decalactone was then desorbed. We propose an industrial process that uses Macronet resins to extract -decalactone from culture broth of R. aurantiaca. [less ▲]

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See detailDevelopment of an original approach to evaluate effects of surfactants, biomass and pollutants on the scaling-up of a two-phase partitioning bioreactor
Aldric, Jean-Marc ULg; Gillet, Sébastien ULg; Delvigne, Frank ULg et al

in Journal of Chemical Technology & Biotechnology (2010), 84

BACKGROUND: Two-phase partitioning bioreactors (TPPBs) are considered as a new technology for xenobiotic degradation in gaseous effluents. However, there is still a need for more knowledge on how to ... [more ▼]

BACKGROUND: Two-phase partitioning bioreactors (TPPBs) are considered as a new technology for xenobiotic degradation in gaseous effluents. However, there is still a need for more knowledge on how to design and scale-up TPPBs. The partitioning of the two phases remains a misunderstood way of research. In particular, the impact of pollutant (isopropylbenzene), biomass and surfactant extract needs to be better evaluated. RESULTS:. An adaptated scale-down apparatus has been developed in order to quantify the speed of phase partitioning (SPP) into a plug flow section. Firstly, it was shown that isopropylbenzene (IPB) doesn’t destabilize more significantly the system. Secondly, respectively 0.5 g.L-1 and 0.05 g.L-1 of biomass and surfactant extract, separately or in mixture, were sufficient to ensure the stability of the two-phase system. Finally, a 100 m3 limit of scaling-up was suggested on the basis of the circulation time comparison. CONCLUSION: The scaling-up of an aqueous/silicone-oil TPPB was found to be definitely conceivable when the presence of biotic compounds were considered. However, further considerations are needed to verify our assumptions, in particular by taking into account the velocity field pattern in full-scale bioreactors and reproduce it in lab-scale apparatus. [less ▲]

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See detailRecovery of γ-decalactone produced by Rhodotorula aurantiaca from the culture broth using Macronet resins
Alchihab, Mohamed; Aldric, Jean-Marc ULg; Aguedo, Mario ULg et al

in New Biotechnology (2009, September), 25S

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See detailMise au point d’un réacteur biphasique eau/huile de silicone destiné au traitement des composés organiques volatils hydrophobes au sein des effluents gazeux
Aldric, Jean-Marc ULg

Doctoral thesis (2009)

Recently, a lot of research has been devoted to the study of two-phase partitioning bioreactors (TPPB) as new technology for xenobiotic degradation in gaseous effluents. These reactors involve the use of ... [more ▼]

Recently, a lot of research has been devoted to the study of two-phase partitioning bioreactors (TPPB) as new technology for xenobiotic degradation in gaseous effluents. These reactors involve the use of a second non-aqueous phase to improve the solubility and transfer of hydrophobic compounds. In this work, we have developed a stirred two-phase partitioning bioreactor using silicone oil as second phase. Initially, Rhodococcus erythropolis T 902.1 was selected on the basis of its capacity to metabolize isopropyl-benzene (IPB), used as representative of the benzene-containing compounds. Secondly, the mass transfer of both IPB and oxygen has been considered with relation to their influence on the hydrodynamics of the reactor and the type of silicone oil used. The addition of 10% low viscosity silicone oil (10 cSt) in the reactor does not significantly affect the oxygen transfer rate. The very high solubility of IPB in the silicone oil leads to an enhancement of the driving force term, especially when high proportion of silicone oil are used. However, it is not necessary to use a volume fraction higher than 10% since KLaIPB and KLaO2 decrease sharply at above such proportion. In addition, an optimal concentration appeared to exist for both biotic components, respectively 0,5 g/L and 0,7 g/L for biomass (B) and surfactant extract (SE) when the global mass transfer coefficient (KLa) of oxygen was measured in the TPPB. More specifically, SE improved the interfacial area “a” by decreasing the bubble diameter, while B reduced it at concentrations up to 1 g/L. In contrast, the SE concentration acted negatively on KL, while it was favoured by the B concentration. In term of performances, it was clearly shown that the biodegradation rate is more directly related to the inlet flow of IPB than to the concentration of IPB in the inlet gas. The TPPB was monitored for 38 days to characterise its behaviour under several operational conditions. During an intermittent loading phase (10 h/day), the average elimination capacity remained above 240 g/m3.h for an average IPB inlet load of 390 g/m3. h. Finaly, an original approach was developed using a scale-down bioreactor allowing to reproduce the hydrodynamics encountered under full scale TPPB. It was clearly shown that the IPB affects negatively the scaling-up of the process by increasing the speed of phase partitioning. However, this negative impact was strongly compensated by the presence of biotic compounds stabilizing the two phase system and rendering the scaling-up process feasible. In conclusion, the use of a water-silicone oil TPPB to remove a high inlet load of IPB was successful. The proposed reactor retains a high potential for the biological treatment of gas effluents polluted by hydrophobic aromatic compounds. The suggested process might be applied in the range of concentration and flow where thermal oxidation is too expensive (between 1 and 7 g/Nm3) or when the biofilters are usually limited, i.e. to treat a polluted effluent concentrated with > 1 g/Nm3 at a flow of 90m3/m3.h. [less ▲]

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See detailDevelopment of an original approach to evaluate effects of surfactants, biomass and pollutants on the scaling-up of a two-phase partitioning bioreactor
Aldric, Jean-Marc ULg

(2009)

BACKGROUND: Two-phase partitioning bioreactors (TPPBs) are considered as a new technology for xenobiotic degradation in gaseous effluents. However, there is still a need for more knowledge on how to ... [more ▼]

BACKGROUND: Two-phase partitioning bioreactors (TPPBs) are considered as a new technology for xenobiotic degradation in gaseous effluents. However, there is still a need for more knowledge on how to design and scale-up TPPBs. The partitioning of the two phases remains a misunderstood way of research. In particular, the impact of pollutant (isopropylbenzene), biomass and surfactant extract needs to be better evaluated. RESULTS:. An adaptated scale-down apparatus has been developed in order to quantify the speed of phase partitioning (SPP) into a plug flow section. Firstly, it was shown that isopropylbenzene (IPB) doesn’t destabilize more significantly the system. Secondly, respectively 0.5 g.L-1 and 0.05 g.L-1 of biomass and surfactant extract, separately or in mixture, were sufficient to ensure the stability of the two-phase system. Finally, a 100 m3 limit of scaling-up was suggested on the basis of the circulation time comparison. CONCLUSION: The scaling-up of an aqueous/silicone-oil TPPB was found to be definitely conceivable when the presence of biotic compounds were considered. However, further considerations are needed to verify our assumptions, in particular by taking into account the velocity field pattern in full-scale bioreactors and reproduce it in lab-scale apparatus. [less ▲]

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See detailEffect of surfactants and biomass on the gas/liquid mass transfer in an aqueous-silicone oil two-phase partitioning bioreactor using Rhodococcus erythropolis T902.1 to remove VOCs from gaseous effluents
Aldric, Jean-Marc ULg; Gillet, Sébastien ULg; Delvigne, Frank ULg et al

in Journal of Chemical Technology & Biotechnology (2009), 84

BACKGROUND: The two-phase partitioning bioreactor (TPPB) has become a new strategy in the context of waste gas treatment. However, the impact of biomass and surfactants on gas/liquid (G/L) mass transfer ... [more ▼]

BACKGROUND: The two-phase partitioning bioreactor (TPPB) has become a new strategy in the context of waste gas treatment. However, the impact of biomass and surfactants on gas/liquid (G/L) mass transfer needs to be better evaluated because the impact of these factors on the mass transfer coefficient “ ” and the interfacial area “ ”, respectively, remains misunderstood. RESULTS: Our study showed that, firstly, the surfactant extract produced by Rhodococcus erythropolis reduced the surface hydrophobicity of the biomass. Secondly, an optimal concentration appeared to exist for both of the components, respectively 0.5 g.L-1 and 0.7 g.L-1 for biomass (B) and surfactant extract (SE) when the global mass transfer coefficient ( ) of oxygen was measured in a silicone oil/water TPPB. However, the combination of B and SE was found to induce a negative synergism. In particular, SE improved the interfacial area “ ” by increasing the bubble diameter, while B reduced it as soon as a concentration of 1g.L-1 was exceeded. By contrast, the SE acted negatively on the , while B improved it overall. CONCLUSION: Better consideration is needed of the effect of biotic components in order to understand the phenomenon of G/L mass transfer in a TPPB. The behaviour of biomass growth and surfactants may strongly influence the mathematical models suggested in the literature. [less ▲]

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See detailStudy on mass transfer of isopropylbenzene and oxygen in a two-phase partitioning bioreactor in the presence of silicone oil.
Aldric, Jean-Marc ULg; Lecomte, Jean-Paul; Thonart, Philippe ULg

in Applied Biochemistry and Biotechnology (2009), 153

A two-phase partitioning bioreactor (TPPB) to treat gas effluents polluted by volatile organic compound (VOC) has been developed. In this work, both the mass transfer of isopropylbenzene (IPB) and oxygen ... [more ▼]

A two-phase partitioning bioreactor (TPPB) to treat gas effluents polluted by volatile organic compound (VOC) has been developed. In this work, both the mass transfer of isopropylbenzene (IPB) and oxygen have been considered in relation to their influence on the hydrodynamics of the reactor and the type of silicone oils used as a second phase. The synergistic effect of silicone oil and stirrer speed on the global oxygen mass transfer coefficient (KLa) and gas-hold-up (up to 12%) have been investigated. The addition of 10% of low viscosity silicone oil (10 centistokes) in the reactor does not significantly affect the oxygen transfer rate. The very high solubility of IPB in the silicone oil leads to an enhancement of driving force term, especially for high fraction of silicone oil. However, it does not seem useful to exceed a volume fraction of 10% since KLaIPB decreases sharply at higher proportions of silicone oil. KLaIPB and KLa O2 evolve in the same way with the proportion of silicone oil. These results confirm the potentialities of our bioreactor to improve both the oxygen and pollutant gas transfer in the field of the treatment of gaseous pollutants, even for highly concentrated effluents. [less ▲]

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See detailImprovement of xylanase production by Penicillium canescens 10-10c in solid-state fermentation
Assamoi, antoine; Delvigne, Frank ULg; Aldric, Jean-Marc ULg et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2008)

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See detailPerformance evaluation of an aqueous-silicone oil two-phase partitioning bioreactor using Rhodococcus erythropolis T902.1 to remove VOC from gaseous effluents.
Aldric, Jean-Marc ULg; Thonart, Philippe ULg

in Journal of Chemical Technology & Biotechnology (2008), 83

BACKGROUND: In the framework of biological processes used for waste gas treatment, the impact of the inoculum size on the start-up performance must be better evaluated. Moreover, only few studies have ... [more ▼]

BACKGROUND: In the framework of biological processes used for waste gas treatment, the impact of the inoculum size on the start-up performance must be better evaluated. Moreover, only few studies have studied the behaviour of elimination capacity and biomass viability in a two-phase partitioning bioreactor (TPPB) used for waste gas treatment. Lastly, the impact of ethanol as a cosubstrate remains misunderstood. RESULTS: Firstly, the results show that no benefit of the inoculation with a high cellular density (> 1.5 g.L-1) can be observed on start-up performances. Secondly, the TPPB was monitored during 38 days to characterise its behaviour for several operational conditions. The removal efficiency is kept at 63 % for an inlet concentration of 7g.Nm-3 isopropylbenzene (IPB) and at some times points reaches 92 % during an intermittent loading phase (10 h.day-1), which corresponds to an elimination capacity mean of 4.10-3 g.L-1.min-1 (240g.m-3react.h-1) for an IPB inlet load (IL) mean of 6.19.10-3 g.L-1min.-1 (390 g.m-3.h-1). At continuous IPB loading, the performances of TPPB fall but the biomass acclimation to this operational condition is shorter than five days. The biomass grows to approximately 10 g.L-1 but cellular viability strongly changes during experiment. It can be suggested an endorespiration phenomenon in the bioreactor. In present work, it is also shown a simultaneous degradation of IPB and ethanol suggesting that the ethanol improves the biodegradation without generating an oxygen depletion. CONCLUSION: The TPPB water-silicone oil, with ethanol as cosubstrate allows removing high inlet load of IPB during the 38 days experiment. [less ▲]

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See detailProteolytic Breakdown Of Gliadin By Enterococcus Faecalis Isolated From Tunisian Fermented Dough
M'Hir, S.; Aldric, Jean-Marc ULg; El Mejdoub, Thami ULg et al

in World Journal of Microbiology & Biotechnology (2008), 24(12),

The aim of this work was to select strains with proteolytic activity on wheat gliadin, among lactic acid bacteria, previously isolated from Tunisian fermented wheat dough. Hydrolysis of gliadin, as sole ... [more ▼]

The aim of this work was to select strains with proteolytic activity on wheat gliadin, among lactic acid bacteria, previously isolated from Tunisian fermented wheat dough. Hydrolysis of gliadin, as sole nitrogen source, in an agar medium was visualized by a clear zone surrounding colonies. The increase in absorbance due to gliadin breakdown was measured spectrophotometrically using Ophthaldialdehyde (OPA) on Gliadin Glucose Broth medium. Fermented liquid dough inoculated with individual selected Enterococcus faecalis, showed a decrease of the gliadin concentration from 45 g/kg to 18 g/kg determined by sandwich ELISA test (R-7001). Only the enterococci strains show an hydrolysis of gliadin proteins. Strains showing proteolytic activity are gaining more and more importance in cereal based fermented foods and may help to reduce gliadin involved in coeliac disease. [less ▲]

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See detailThe two-phase water/silicon oil bioreactor prospects in off-gas treatment
Aldric, Jean-Marc ULg; Destain, Jacqueline ULg; Thonart, Philippe ULg

in Applied Biochemistry and Biotechnology (2005), 121(Spring), 707-719

Research was carried out to develop a biphasic biologic reactor able to clean the gas effluents polluted by volatile organic compounds. Initially, Rhodococcus erythropolis T 902.1 was selected on the ... [more ▼]

Research was carried out to develop a biphasic biologic reactor able to clean the gas effluents polluted by volatile organic compounds. Initially, Rhodococcus erythropolis T 902.1 was selected on the basis of its capacity to degrade isopropylbenzene (IPB). The effect of gas flow and IPB concentration on the biodegadation of IPB was evaluated. The results show that the use of silicon oil allows large quantities of IPB to be absorbed within the medium of biologic abatement. On the other hand, the biodegradation rate was directly correlated to the inlet flow of IPB. Thus, the reactor presents interesting opportunities for the biologic treatment of gas effluents. [less ▲]

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See detailTraitement biologique d’un effluent de l’industrie des olives
Alloue; Aldric, Jean-Marc ULg; Destain, Jacqueline ULg et al

in Tribune de l'Eau (La) (2005)

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See detailSTUDY OF SOME FACTORS INFLUENCING BIODEGRADATION OF ISOPROPYLBENZENE BY RHODOCOCCUS ERYTHROPOLIS
Aldric, Jean-Marc ULg; Destain, Jacqueline; Thonart, Philippe ULg

(2003, May 06)

THE PRESENT STUDY EXAMINES THE EFFECT OF VARIOUS FACTORS ON THE BIODEGRADATION OF IPB BY RHODOCOCCUS ERYTHROPOLYS. BY THE IMPLEMENTED PLAN OF PLACKETT AND BURMAN, A POSITIVE EFFECT OF IRON, NEUTRAL pH AND ... [more ▼]

THE PRESENT STUDY EXAMINES THE EFFECT OF VARIOUS FACTORS ON THE BIODEGRADATION OF IPB BY RHODOCOCCUS ERYTHROPOLYS. BY THE IMPLEMENTED PLAN OF PLACKETT AND BURMAN, A POSITIVE EFFECT OF IRON, NEUTRAL pH AND ETHANOL ON THE BIODEGRADATION COULD BE DEMONSTRATED. COMPLEMENTARY EXPERIMENTS IN A BIOREACTOR SHOW THAT ETHANOL, USED AS COSUBSTRATE IN BUFFERED MEDIUM, ALLOWS CELL GROWTH WHILE OPTIMIZING BIODEGRADATION OF IPB. [less ▲]

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