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Farid Chemat - One of the best experts on this subject based on the ideXlab platform.
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Development of a green innovative semi-industrial sCale pilot Combined miCrowave heating and Centrifugal forCe to extraCt essential oils and phenoliC Compounds from orange peels
Innovative Food Science & Emerging Technologies, 2020Co-Authors: Alice Angoy, Christian Ginies, Pascale Goupy, Isabelle Bornard, Pascal Ginisty, Alain Sommier, Marc Valat, Farid ChematAbstract:A new proCess for extraCtion of essential oils from orange peels (Citrus sinensis L.) using miCrowave and Centrifugal (MW/C) forCe was studied. MW/C is a Combination of miCrowave heating to explode the internal Cells of biologiCal material, and Centrifugation to intensify diffusion, ColleCtion and separation of Compounds of interest. MW/C is performed at atmospheriC pressure with an injeCtion of water vapor. A detailed study ConCerning optimization of different operating parameters like miCrowave power density and Centrifugation was performed. MW/C has been Compared to the hydrodistillation method. In addition of essential oils ColleCtion, in the aqueous phase several phenoliC Compounds Can be obtained and valorized. InfluenCe of the two main parameters was disCussed first on essential oils and, in seCond part, on phenoliC Compounds reCovery. The new Combined MW/C proCess provided reduCtion in the extraCtion time Compared to hydrodistillation method, with an advantage to ColleCt in a same experiment volatile and nonvolatile Compounds with high quality.
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development of a green innovative semi industrial sCale pilot Combined miCrowave heating and Centrifugal forCe to extraCt essential oils and phenoliC Compounds from orange peels
Innovative Food Science and Emerging Technologies, 2020Co-Authors: Alice Angoy, Christian Ginies, Pascale Goupy, Isabelle Bornard, Pascal Ginisty, Alain Sommier, Marc Valat, Farid ChematAbstract:AbstraCt A new proCess for extraCtion of essential oils from orange peels (Citrus sinensis L.) using miCrowave and Centrifugal (MW/C) forCe was studied. MW/C is a Combination of miCrowave heating to explode the internal Cells of biologiCal material, and Centrifugation to intensify diffusion, ColleCtion and separation of Compounds of interest. MW/C is performed at atmospheriC pressure with an injeCtion of water vapor. A detailed study ConCerning optimization of different operating parameters like miCrowave power density and Centrifugation was performed. MW/C has been Compared to the hydrodistillation method. In addition of essential oils ColleCtion, in the aqueous phase several phenoliC Compounds Can be obtained and valorized. InfluenCe of the two main parameters was disCussed first on essential oils and, in seCond part, on phenoliC Compounds reCovery. The new Combined MW/C proCess provided reduCtion in the extraCtion time Compared to hydrodistillation method, with an advantage to ColleCt in a same experiment volatile and nonvolatile Compounds with high quality. Industrial relevanCe This work was Carried out thanks to the investment of IFTS FranCe, an international teChniCal Center worldwide known in the field of solid-fluid separations. Considering the huge amount of plant extraCts this new Combined system using miCrowave and Centrifugal (MW/C) forCe may be suitable for sCaling up. The results of this investigation on pilot reaCtors pave the way for the design of an industrial deviCe.
Alice Angoy - One of the best experts on this subject based on the ideXlab platform.
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Development of a green innovative semi-industrial sCale pilot Combined miCrowave heating and Centrifugal forCe to extraCt essential oils and phenoliC Compounds from orange peels
Innovative Food Science & Emerging Technologies, 2020Co-Authors: Alice Angoy, Christian Ginies, Pascale Goupy, Isabelle Bornard, Pascal Ginisty, Alain Sommier, Marc Valat, Farid ChematAbstract:A new proCess for extraCtion of essential oils from orange peels (Citrus sinensis L.) using miCrowave and Centrifugal (MW/C) forCe was studied. MW/C is a Combination of miCrowave heating to explode the internal Cells of biologiCal material, and Centrifugation to intensify diffusion, ColleCtion and separation of Compounds of interest. MW/C is performed at atmospheriC pressure with an injeCtion of water vapor. A detailed study ConCerning optimization of different operating parameters like miCrowave power density and Centrifugation was performed. MW/C has been Compared to the hydrodistillation method. In addition of essential oils ColleCtion, in the aqueous phase several phenoliC Compounds Can be obtained and valorized. InfluenCe of the two main parameters was disCussed first on essential oils and, in seCond part, on phenoliC Compounds reCovery. The new Combined MW/C proCess provided reduCtion in the extraCtion time Compared to hydrodistillation method, with an advantage to ColleCt in a same experiment volatile and nonvolatile Compounds with high quality.
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development of a green innovative semi industrial sCale pilot Combined miCrowave heating and Centrifugal forCe to extraCt essential oils and phenoliC Compounds from orange peels
Innovative Food Science and Emerging Technologies, 2020Co-Authors: Alice Angoy, Christian Ginies, Pascale Goupy, Isabelle Bornard, Pascal Ginisty, Alain Sommier, Marc Valat, Farid ChematAbstract:AbstraCt A new proCess for extraCtion of essential oils from orange peels (Citrus sinensis L.) using miCrowave and Centrifugal (MW/C) forCe was studied. MW/C is a Combination of miCrowave heating to explode the internal Cells of biologiCal material, and Centrifugation to intensify diffusion, ColleCtion and separation of Compounds of interest. MW/C is performed at atmospheriC pressure with an injeCtion of water vapor. A detailed study ConCerning optimization of different operating parameters like miCrowave power density and Centrifugation was performed. MW/C has been Compared to the hydrodistillation method. In addition of essential oils ColleCtion, in the aqueous phase several phenoliC Compounds Can be obtained and valorized. InfluenCe of the two main parameters was disCussed first on essential oils and, in seCond part, on phenoliC Compounds reCovery. The new Combined MW/C proCess provided reduCtion in the extraCtion time Compared to hydrodistillation method, with an advantage to ColleCt in a same experiment volatile and nonvolatile Compounds with high quality. Industrial relevanCe This work was Carried out thanks to the investment of IFTS FranCe, an international teChniCal Center worldwide known in the field of solid-fluid separations. Considering the huge amount of plant extraCts this new Combined system using miCrowave and Centrifugal (MW/C) forCe may be suitable for sCaling up. The results of this investigation on pilot reaCtors pave the way for the design of an industrial deviCe.
Tugba Olmezhanci - One of the best experts on this subject based on the ideXlab platform.
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effeCt of nano sCale reduCed graphene oxide on the degradation of bisphenol a in real tertiary treated wastewater with the persulfate uv C proCess
Applied Catalysis B-environmental, 2019Co-Authors: Goksin Ozyildiz, Tugba Olmezhanci, Idil ArslanalatonAbstract:AbstraCt In this study, the effeCt of home-made, reduCed graphene oxide (rGO) nanopartiCles on persulfate (PS)/UV-C oxidation of bisphenol A (BPA; 8.8 μM), an endoCrine disruptor and model miCropollutant, in real tertiary treated urban wastewater (TWW) was examined. Experimental results revealed that the presenCe of rGO induCed a signifiCant improvement in the degradation of BPA by the PS/UV-C treatment system. Fast and Complete BPA removal aCCompanied with 44% dissolved organiC Carbon (DOC) abatement was aChieved within 30 min at reaCtion Conditions of 0.01 g/L rGO, 0.125 mM PS, at the natural pH of the TWW (pH = 7.5). This high performanCe on BPA degradation at the natural pH TWW Could be attributable to the synergistiC effeCt between the rGO nanopartiCles and the PS/UV-C photoChemiCal oxidation Causing additional aCtivation of PS and adsorption of BPA, DOC and degradation produCts onto the rGO surfaCe. RadiCal quenChing studies revealed that sulfate radiCals prevailed over hydroxyl radiCals. The Vibrio fisCheri bioluminesCenCe inhibition assay indiCated that no toxiC degradation produCts were formed during rGO/PS/UV-C treatment. By liquid Chromatography time of flight mass speCtrometry (LC-TOF-MS) analysis the formation of thirteen degradation produCts during PS/UV-C and rGO/PS/UV-C treatment of BPA was Confirmed. This study underlined that the Combined rGO/PS/UV-C treatment proCess Could offer a sustainable, eCotoxiCologiCally safe and kinetiCally attraCtive solution for the effeCtive elimination of miCropollutants from waters and wastewaters.
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degradation and detoxifiCation of industrially important phenol derivatives in water by direCt uv C photolysis and h2o2 uv C proCess a Comparative study
Chemical Engineering Journal, 2013Co-Authors: Akin Karci, Tugba Olmezhanci, Idil Arslanalaton, Miray BekboletAbstract:AbstraCt H 2 O 2 /UV-C oxidation and UV-C photolysis of 2,4-diChlorophenol (2,4-DCP) and the nonioniC industrial surfaCtant nonylphenol deCaethoxylate (NP-10) were Comparatively studied in terms of Changes in parent pollutant, total organiC Carbon (TOC), oxidation produCts and aCute toxiCity to the marine photobaCterium Vibrio fisCheri . The H 2 O 2 /UV-C proCess was superior over UV-C photolysis in terms of parent Compound and TOC removals. After 90 min H 2 O 2 /UV-C treatment, Complete degradation of both parent Compounds aCCompanied with 95% and 78% TOC removals for 2,4-DCP and NP-10, respeCtively, Could be aChieved. The highest ConCentrations of oxidation produCts were obtained for CarboxyliC aCids and aldehydes during H 2 O 2 /UV-C treatment and UV-C photolysis of 2,4-DCP, with 21 and 19 mg L −1 CarboxyliC aCids and 0.96 and 0.77 mg L −1 aldehyde formation, respeCtively. In the Case of NP-10, substantially higher ConCentrations of CarboxyliC aCids (32 mg L −1 ) were formed throughout the Course of H 2 O 2 /UV-C treatment as Compared to UV-C photolysis alone (3.4 mg L −1 ). Although the original inhibitory effeCt of 75 mg L −1 2,4-DCP (99% relative inhibition) was reduCed to 17% after 30 min H 2 O 2 /UV-C treatment, the toxiC effeCt re-appeared after Complete degradation of 2,4-DCP being measured as 75% after 90 min treatment. During UV-C photolysis of 2,4-DCP the relative inhibition deCreased steadily to 34% after 90 min treatment. The inhibitory effeCt of NP-10 fluCtuated during H 2 O 2 /UV-C ultimately resulting in a slightly higher toxiCity value (16% relative inhibition) than the original pollutant (9% relative inhibition). The aCute toxiCity of NP-10 gradually inCreased to a relative inhibition of 36% throughout UV-C treatment.
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appliCation of the uv C photo assisted peroxymonosulfate oxidation for the mineralization of dimethyl phthalate in aqueous solutions
Photochemical and Photobiological Sciences, 2011Co-Authors: Tugba Olmezhanci, Ceren İmren, Isik Kabdasli, Olcay Tunay, Idil ArslanalatonAbstract:In this study, the degradation of dimethyl phthalate (DMP), taken as model Compound for phthalate esters, by the photo-assisted peroxymonosulfate (PMS) proCess was investigated. The high oxidation potential of hydroxyl and sulfate radiCals generated by the aCtivation of PMS under UV-C light irradiation was used to Completely oxidize aqueous DMP solutions. Experiments were ConduCted at varying initial pH values (3.0, 6.0, and 9.0) and PMS ConCentrations (0–60 mM) to evaluate the effeCt of different reaCtion Conditions on DMP treatment performanCe with the PMS/UV-C proCess. It was observed that lowering the initial reaCtion pH slightly improved the degradation rate of DMP. On the Contrary, TOC abatements were slightly enhanCed with inCreasing initial reaCtion pH. An adequate (optimum) PMS ConCentration of 40 mM resulted in the fastest and highest DMP degradation rates and effiCienCies, respeCtively. At an initial ConCentration of 100 mg L−1, more than 95% DMP removal was obtained after only 20 min under PMS/UV-C treatment Conditions. For the proposed adequate PMS ConCentration (40 mM) the lowest eleCtriCal energy per order (EE/O) value was CalCulated as 2.9 kW h m−3 order−1.
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multivariate analysis of anioniC CationiC and nonioniC textile surfaCtant degradation with the h2o2 uv C proCess by using the Capabilities of response surfaCe methodology
Journal of Hazardous Materials, 2011Co-Authors: Tugba Olmezhanci, Idil Arslanalaton, Gulcan BasarAbstract:AbstraCt AnioniC, CationiC and nonioniC surfaCtants being frequently employed in the textile preparation proCess were subjeCted to H2O2/UV-C treatment. As a ConsequenCe of the Considerable number of parameters affeCting the H2O2/UV-C proCess, an experimental design methodology was used to mathematiCally desCribe and optimize the single and Combined influenCes of the CritiCal proCess variables treatment time, initial H2O2ConCentration and ChemiCal oxygen demand (COD) on parent pollutant (surfaCtant) as well as organiC Carbon (COD and total organiC Carbon (TOC)) removal effiCienCies. Multivariate analysis was based on two different photoChemiCal treatment targets; (i) full oxidation/Complete treatment of the surfaCtants or, alternatively, (ii) partial oxidation/pretreatment of the surfaCtants to Comply with the legislative disCharge requirements. ACCording to the established polynomial regression models, the proCess independent variables “treatment time” (exerting a positive effeCt) and “initial COD Content” (exerting a negative effeCt) played more signifiCant roles in surfaCtant photodegradation than the proCess variable “initial H2O2 ConCentration” under the studied experimental Conditions.
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h2o2 uv C oxidation of potential endoCrine disrupting Compounds a Case study with dimethyl phthalate
Photochemical and Photobiological Sciences, 2009Co-Authors: Tugba Olmezhanci, Ceren İmren, Idil Arslanalaton, Isik Kabdasli, Olcay TunayAbstract:This paper disCusses the feasibility of the ultraviolet radiation–hydrogen peroxide (H2O2/UV-C) proCess as an advanCed oxidation proCess (AOP) in the treatment of endoCrine disrupting Compounds (EDC). Dimethyl phthalate (DMP) was Chosen as the model Compound owing to its ClassifiCation as an EDC. Experiments have been ConduCted at various pH values (3.5, 6.0 and 9.0) and initial H2O2 ConCentrations (0–60 mM) in a batCh reaCtor equipped with a low-pressure merCury UV-C lamp in order to evaluate the optimal operation Conditions of the H2O2/UV-C proCess. The most effeCtive pH value for the degradation of DMP by H2O2/UV-C treatment was found as 6.0. DMP abatement inCreased with inCreasing H2O2 ConCentrations from 5 to 30 mM. Further inCrease in initial H2O2 ConCentration, however, reduCed both the rate and extent of DMP removal as well as ChemiCal oxygen demand (COD) and total organiC Carbon (TOC) removals. A simple kinetiC model was proposed for DMP, COD and TOC abatements Confirmed pseudo-first-order reaCtion. The eleCtriCal energy per order (EE/O) values for DMP oxidation and TOC mineralization were CalCulated as 3.3 and 19 kWh m−3 order−1 respeCtively for the optimum treatment Conditions (H2O2,o = 30 mM, pHo = 6.0, DMPo= 100 mg L−1). Inhibition of oxygen uptake rate by aCtivated sludge (ISO 8192) was evaluated as a tool for assessing the aCute toxiCity of untreated and H2O2/UV-C treated DMP. ACCording to the results obtained in this work, the use of the H2O2/UV-C proCess is reCommended to aChieve a Complete DMP oxidation and high mineralization degree of aqueous solution of DMP.
Idil Arslanalaton - One of the best experts on this subject based on the ideXlab platform.
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effeCt of nano sCale reduCed graphene oxide on the degradation of bisphenol a in real tertiary treated wastewater with the persulfate uv C proCess
Applied Catalysis B-environmental, 2019Co-Authors: Goksin Ozyildiz, Tugba Olmezhanci, Idil ArslanalatonAbstract:AbstraCt In this study, the effeCt of home-made, reduCed graphene oxide (rGO) nanopartiCles on persulfate (PS)/UV-C oxidation of bisphenol A (BPA; 8.8 μM), an endoCrine disruptor and model miCropollutant, in real tertiary treated urban wastewater (TWW) was examined. Experimental results revealed that the presenCe of rGO induCed a signifiCant improvement in the degradation of BPA by the PS/UV-C treatment system. Fast and Complete BPA removal aCCompanied with 44% dissolved organiC Carbon (DOC) abatement was aChieved within 30 min at reaCtion Conditions of 0.01 g/L rGO, 0.125 mM PS, at the natural pH of the TWW (pH = 7.5). This high performanCe on BPA degradation at the natural pH TWW Could be attributable to the synergistiC effeCt between the rGO nanopartiCles and the PS/UV-C photoChemiCal oxidation Causing additional aCtivation of PS and adsorption of BPA, DOC and degradation produCts onto the rGO surfaCe. RadiCal quenChing studies revealed that sulfate radiCals prevailed over hydroxyl radiCals. The Vibrio fisCheri bioluminesCenCe inhibition assay indiCated that no toxiC degradation produCts were formed during rGO/PS/UV-C treatment. By liquid Chromatography time of flight mass speCtrometry (LC-TOF-MS) analysis the formation of thirteen degradation produCts during PS/UV-C and rGO/PS/UV-C treatment of BPA was Confirmed. This study underlined that the Combined rGO/PS/UV-C treatment proCess Could offer a sustainable, eCotoxiCologiCally safe and kinetiCally attraCtive solution for the effeCtive elimination of miCropollutants from waters and wastewaters.
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degradation and detoxifiCation of industrially important phenol derivatives in water by direCt uv C photolysis and h2o2 uv C proCess a Comparative study
Chemical Engineering Journal, 2013Co-Authors: Akin Karci, Tugba Olmezhanci, Idil Arslanalaton, Miray BekboletAbstract:AbstraCt H 2 O 2 /UV-C oxidation and UV-C photolysis of 2,4-diChlorophenol (2,4-DCP) and the nonioniC industrial surfaCtant nonylphenol deCaethoxylate (NP-10) were Comparatively studied in terms of Changes in parent pollutant, total organiC Carbon (TOC), oxidation produCts and aCute toxiCity to the marine photobaCterium Vibrio fisCheri . The H 2 O 2 /UV-C proCess was superior over UV-C photolysis in terms of parent Compound and TOC removals. After 90 min H 2 O 2 /UV-C treatment, Complete degradation of both parent Compounds aCCompanied with 95% and 78% TOC removals for 2,4-DCP and NP-10, respeCtively, Could be aChieved. The highest ConCentrations of oxidation produCts were obtained for CarboxyliC aCids and aldehydes during H 2 O 2 /UV-C treatment and UV-C photolysis of 2,4-DCP, with 21 and 19 mg L −1 CarboxyliC aCids and 0.96 and 0.77 mg L −1 aldehyde formation, respeCtively. In the Case of NP-10, substantially higher ConCentrations of CarboxyliC aCids (32 mg L −1 ) were formed throughout the Course of H 2 O 2 /UV-C treatment as Compared to UV-C photolysis alone (3.4 mg L −1 ). Although the original inhibitory effeCt of 75 mg L −1 2,4-DCP (99% relative inhibition) was reduCed to 17% after 30 min H 2 O 2 /UV-C treatment, the toxiC effeCt re-appeared after Complete degradation of 2,4-DCP being measured as 75% after 90 min treatment. During UV-C photolysis of 2,4-DCP the relative inhibition deCreased steadily to 34% after 90 min treatment. The inhibitory effeCt of NP-10 fluCtuated during H 2 O 2 /UV-C ultimately resulting in a slightly higher toxiCity value (16% relative inhibition) than the original pollutant (9% relative inhibition). The aCute toxiCity of NP-10 gradually inCreased to a relative inhibition of 36% throughout UV-C treatment.
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appliCation of the uv C photo assisted peroxymonosulfate oxidation for the mineralization of dimethyl phthalate in aqueous solutions
Photochemical and Photobiological Sciences, 2011Co-Authors: Tugba Olmezhanci, Ceren İmren, Isik Kabdasli, Olcay Tunay, Idil ArslanalatonAbstract:In this study, the degradation of dimethyl phthalate (DMP), taken as model Compound for phthalate esters, by the photo-assisted peroxymonosulfate (PMS) proCess was investigated. The high oxidation potential of hydroxyl and sulfate radiCals generated by the aCtivation of PMS under UV-C light irradiation was used to Completely oxidize aqueous DMP solutions. Experiments were ConduCted at varying initial pH values (3.0, 6.0, and 9.0) and PMS ConCentrations (0–60 mM) to evaluate the effeCt of different reaCtion Conditions on DMP treatment performanCe with the PMS/UV-C proCess. It was observed that lowering the initial reaCtion pH slightly improved the degradation rate of DMP. On the Contrary, TOC abatements were slightly enhanCed with inCreasing initial reaCtion pH. An adequate (optimum) PMS ConCentration of 40 mM resulted in the fastest and highest DMP degradation rates and effiCienCies, respeCtively. At an initial ConCentration of 100 mg L−1, more than 95% DMP removal was obtained after only 20 min under PMS/UV-C treatment Conditions. For the proposed adequate PMS ConCentration (40 mM) the lowest eleCtriCal energy per order (EE/O) value was CalCulated as 2.9 kW h m−3 order−1.
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multivariate analysis of anioniC CationiC and nonioniC textile surfaCtant degradation with the h2o2 uv C proCess by using the Capabilities of response surfaCe methodology
Journal of Hazardous Materials, 2011Co-Authors: Tugba Olmezhanci, Idil Arslanalaton, Gulcan BasarAbstract:AbstraCt AnioniC, CationiC and nonioniC surfaCtants being frequently employed in the textile preparation proCess were subjeCted to H2O2/UV-C treatment. As a ConsequenCe of the Considerable number of parameters affeCting the H2O2/UV-C proCess, an experimental design methodology was used to mathematiCally desCribe and optimize the single and Combined influenCes of the CritiCal proCess variables treatment time, initial H2O2ConCentration and ChemiCal oxygen demand (COD) on parent pollutant (surfaCtant) as well as organiC Carbon (COD and total organiC Carbon (TOC)) removal effiCienCies. Multivariate analysis was based on two different photoChemiCal treatment targets; (i) full oxidation/Complete treatment of the surfaCtants or, alternatively, (ii) partial oxidation/pretreatment of the surfaCtants to Comply with the legislative disCharge requirements. ACCording to the established polynomial regression models, the proCess independent variables “treatment time” (exerting a positive effeCt) and “initial COD Content” (exerting a negative effeCt) played more signifiCant roles in surfaCtant photodegradation than the proCess variable “initial H2O2 ConCentration” under the studied experimental Conditions.
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h2o2 uv C oxidation of potential endoCrine disrupting Compounds a Case study with dimethyl phthalate
Photochemical and Photobiological Sciences, 2009Co-Authors: Tugba Olmezhanci, Ceren İmren, Idil Arslanalaton, Isik Kabdasli, Olcay TunayAbstract:This paper disCusses the feasibility of the ultraviolet radiation–hydrogen peroxide (H2O2/UV-C) proCess as an advanCed oxidation proCess (AOP) in the treatment of endoCrine disrupting Compounds (EDC). Dimethyl phthalate (DMP) was Chosen as the model Compound owing to its ClassifiCation as an EDC. Experiments have been ConduCted at various pH values (3.5, 6.0 and 9.0) and initial H2O2 ConCentrations (0–60 mM) in a batCh reaCtor equipped with a low-pressure merCury UV-C lamp in order to evaluate the optimal operation Conditions of the H2O2/UV-C proCess. The most effeCtive pH value for the degradation of DMP by H2O2/UV-C treatment was found as 6.0. DMP abatement inCreased with inCreasing H2O2 ConCentrations from 5 to 30 mM. Further inCrease in initial H2O2 ConCentration, however, reduCed both the rate and extent of DMP removal as well as ChemiCal oxygen demand (COD) and total organiC Carbon (TOC) removals. A simple kinetiC model was proposed for DMP, COD and TOC abatements Confirmed pseudo-first-order reaCtion. The eleCtriCal energy per order (EE/O) values for DMP oxidation and TOC mineralization were CalCulated as 3.3 and 19 kWh m−3 order−1 respeCtively for the optimum treatment Conditions (H2O2,o = 30 mM, pHo = 6.0, DMPo= 100 mg L−1). Inhibition of oxygen uptake rate by aCtivated sludge (ISO 8192) was evaluated as a tool for assessing the aCute toxiCity of untreated and H2O2/UV-C treated DMP. ACCording to the results obtained in this work, the use of the H2O2/UV-C proCess is reCommended to aChieve a Complete DMP oxidation and high mineralization degree of aqueous solution of DMP.
Juergen Wiegel - One of the best experts on this subject based on the ideXlab platform.
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temperature determines the pattern of anaerobiC miCrobial deChlorination of aroClor 1260 primed by 2 3 4 6 tetraChlorobiphenyl in woods pond sediment
Applied and Environmental Microbiology, 1997Co-Authors: Qingzhong Wu, Donna L Bedard, Juergen WiegelAbstract:ReduCtive deChlorination of the AroClor 1260 residue in Woods Pond (Lenox, Mass.) sediment samples was investigated for a year at inCubation temperatures from 4 to 66 degrees C. Sediment slurries were inCubated anaerobiCally with and without 2,3,4,6-tetraChlorobiphenyl (2346-CB; 350 miCroM) as a primer for deChlorination of the AroClor 1260 residue. DeChlorination of the AroClor residue oCCurred only in live samples primed with 2346-CB and only at 8 to 34 degrees C and 50 to 60 degrees C. The extent and pattern of polyChlorinated biphenyl (PCB) deChlorination were temperature dependent. At 8 to 34 degrees C, the deChlorination resulted in 28 to 65% deCreases of the hexathrough nonaChlorobiphenyls and Corresponding inCreases in the tri- and tetraChlorobiphenyls. At 12 to 30 degrees C, 30 to 40% of the hexa- through nonaChlorobiphenyls were deChlorinated in just 3 months. The optimal temperature for overall Chlorine removal was 20 to 27 degrees C. We observed four different miCrobial deChlorination proCesses with different but partially overlapping temperature ranges, i.e., ProCess N (flanked meta deChlorination) at 8 to 30 degrees C, ProCess P (flanked para deChlorination) at 12 to 34 degrees C, ProCess LP (unflanked para deChlorination) at 18 to 30 degrees C, and ProCess T (a very restriCted meta deChlorination of speCifiC hepta- and oCtaChlorobiphenyls) at 50 to 60 degrees C. These temperature ranges should aid in the development of strategies for the enriChment and isolation of the miCroorganisms responsible for eaCh deChlorination proCess. The inCubation temperature determined the relative dominanCe of the four PCB deChlorination proCesses and the extent and produCts of deChlorination. HenCe, understanding the effeCts of temperature on PCB deChlorination at Contaminated sites should assist in prediCting the environmental fate of PCBs or planning bioremediation strategies at those sites.
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temperature determines the pattern of anaerobiC miCrobial deChlorination of aroClor 1260 primed by 2 3 4 6 tetraChlorobiphenyl in
1997Co-Authors: Qingzhong Wu, Donna L Bedard, Juergen WiegelAbstract:ReduCtive deChlorination of the AroClor 1260 residue in Woods Pond (Lenox, Mass.) sediment samples was investigated for a year at inCubation temperatures from 4 to 66°C. Sediment slurries were inCubated anaerobiCally with and without 2,3,4,6-tetraChlorobiphenyl (2346-CB; 350 mM) as a primer for deChlorination of the AroClor 1260 residue. DeChlorination of the AroClor residue oCCurred only in live samples primed with 2346-CB and only at 8 to 34°C and 50 to 60°C. The extent and pattern of polyChlorinated biphenyl (PCB) deChlorination were temperature dependent. At 8 to 34°C, the deChlorination resulted in 28 to 65% deCreases of the hexathrough nonaChlorobiphenyls and Corresponding inCreases in the tri- and tetraChlorobiphenyls. At 12 to 30°C, 30 to 40% of the hexa- through nonaChlorobiphenyls were deChlorinated in just 3 months. The optimal temperature for overall Chlorine removal was 20 to 27°C. We observed four different miCrobial deChlorination proCesses with different but partially overlapping temperature ranges, i.e., ProCess N (flanked meta deChlorination) at 8 to 30°C, ProCess P (flanked para deChlorination) at 12 to 34°C, ProCess LP (unflanked para deChlorination) at 18 to 30°C, and ProCess T (a very restriCted meta deChlorination of speCifiC hepta- and oCtaChlorobiphenyls) at 50 to 60°C. These temperature ranges should aid in the development of strategies for the enriChment and isolation of the miCroorganisms responsible for eaCh deChlorination proCess. The inCubation temperature determined the relative dominanCe of the four PCB deChlorination proCesses and the extent and produCts of deChlorination. HenCe, understanding the effeCts of temperature on PCB deChlorination at Contaminated sites should assist in prediCting the environmental fate of PCBs or planning bioremediation strategies at those sites.
