64 research outputs found
Procédés intégrés pour l'élimination des polluants organiques persistants : lavages de sol et procédés d'oxydation avancée électrochimiques combinés à un possible post-traitement biologique
Soils contaminated by hydrophobic organic pollutants like polycyclic aromatic hydrocarbons (PAHs) are a common concern since they are extremely difficult to remove and their potential toxicological impacts are significant. As an alternative to traditional thermal or physical treatments, soil washing and soil flushing processes appear to be conceivable and efficient approaches, especially for higher level of pollution. However, the treatment of highly loaded soil washing/flushing solutions is another challenge to overcome. In that way, a new integrated approach is suggested: soil washing/flushing processes combined to an electrochemical advanced oxidation process (EAOP) in a combination with a recirculation loop (to save extracting agents) and/or a biological post-treatment step (to minimize energy cost).Extraction efficiency of the extracting agent like hydroxypropyl-beta-cyclodextrin (HPCD) is compared to the traditional non-ionic surfactant Tween 80 in synthetic and real soil washing solutions. A new simple fluorescent sensitive and selective quantification method is developed to monitor Tween 80 oxidation. Two EAOPs were compared: electro-Fenton (EF) and anodic oxidation (AO). Platinum (Pt) (in EF process) and boron doped diamond (BDD) (in both treatment) anodes are the respective electrodes employed to recycle effluents and to consider a biological post-treatment, respectively. Regarding the extracting agent recovery, the biodegradability evolution of effluent and the energy consumption (in kWh (kgTOC)-1) during EAOP, HPCD is more advantageous than Tween 80. However, in terms of extraction efficiency, costs of extracting agents and impact on soil respirometry, Tween 80 is much more efficient. By considering all these advantages and drawbacks, Tween 80 could still appear to be the best optionLes sols contaminĂ©s par les polluants organiques hydrophobes tels que les Hydrocarbures Aromatiques Polycycliques (HAPs) constituent un problĂšme majeur puisqu'ils sont difficilement Ă©liminĂ©s et leurs impacts toxicologiques restent significatifs. Comme alternative aux procĂ©dĂ©s thermiques et physiques traditionnels, les procĂ©dĂ©s de lavages de sol in situ et ex situ apparaissent ĂȘtre une solution envisageable et efficace et particuliĂšrement pour les fortes pollutions. Cependant, le traitement des solutions fortement chargĂ©es de lavages de sol est une autre barriĂšre Ă surmonter. Une nouvelle approche combinĂ©e est proposĂ©e pour rĂ©pondre Ă ce problĂšme: les procĂ©dĂ©s de lavages de sol in situ/ex situ combinĂ©s Ă un ProcĂ©dĂ© Electrochimique d'Oxydation AvancĂ©e Electrochimique (PEOA) avec possibilitĂ© de recirculer l'effluent (pour rĂ©utiliser l'agent extractant) et/ou de combiner avec un post-traitement biologique (pour minimiser le coĂ»t Ă©nergĂ©tique).L'efficacitĂ© d'extraction de l'agent extractant tel que l'hydroxypropyl-beta-cyclodextrine (HPCD) est comparĂ© au traditionnel tensioactif non-ionique dĂ©nommĂ© Tween 80, dans les solutions synthĂ©tiques et rĂ©elles de lavages de sol. Une nouvelle mĂ©thode sensible d'analyse du Tween 80, basĂ©e sur la fluorescence, est dĂ©veloppĂ©e pour suivre l'oxydation du Tween 80. Deux PEOAs sont comparĂ©s : l'Ă©lectro-Fenton (EF) et l'oxydation anodique (OA). Les anodes de platine (Pt) (dans le procĂ©dĂ© EF) et de diamant dopĂ©s au bore (BDD) (dans les deux procĂ©dĂ©s) sont respectivement utilisĂ©es pour Ă©tudier la recirculation des effluents et la possibilitĂ© d'une combinaison avec un post-traitement biologique. Concernant la rĂ©utilisation des agents extractants, l'Ă©volution de la biodĂ©gradabilitĂ© des solutions et l'Ă©nergie consommĂ©e (en kWh (kg COT)-1) pendant les PEAOs testĂ©s, l'HPCD est trouvĂ©e ĂȘtre plus avantageuse que le Tween 80. En revanche, en terme d'efficacitĂ© d'extraction, de coĂ»t des agents extractants et d'impact sur la respiromĂ©trie du sol, le Tween 80 paraĂźt ĂȘtre plus avantageux. En prenant en compte tous ces avantages et inconvĂ©nients, le Tween 80 pourrait ĂȘtre retenu comme la meilleure solutio
Procédés intégrés pour l'élimination des polluants organiques persistants (lavages de sol et procédés d'oxydation avancée électrochimiques combinés à un possible post-traitement biologique)
Les sols contaminĂ©s par les polluants organiques hydrophobes tels que les Hydrocarbures Aromatiques Polycycliques (HAPs) constituent un problĂšme majeur puisqu'ils sont difficilement Ă©liminĂ©s et leurs impacts toxicologiques restent significatifs. Comme alternative aux procĂ©dĂ©s thermiques et physiques traditionnels, les procĂ©dĂ©s de lavages de sol in situ et ex situ apparaissent ĂȘtre une solution envisageable et efficace et particuliĂšrement pour les fortes pollutions. Cependant, le traitement des solutions fortement chargĂ©es de lavages de sol est une autre barriĂšre Ă surmonter. Une nouvelle approche combinĂ©e est proposĂ©e pour rĂ©pondre Ă ce problĂšme: les procĂ©dĂ©s de lavages de sol in situ/ex situ combinĂ©s Ă un ProcĂ©dĂ© Electrochimique d'Oxydation AvancĂ©e Electrochimique (PEOA) avec possibilitĂ© de recirculer l'effluent (pour rĂ©utiliser l'agent extractant) et/ou de combiner avec un post-traitement biologique (pour minimiser le coĂ»t Ă©nergĂ©tique).L'efficacitĂ© d'extraction de l'agent extractant tel que l'hydroxypropyl-beta-cyclodextrine (HPCD) est comparĂ© au traditionnel tensioactif non-ionique dĂ©nommĂ© Tween 80, dans les solutions synthĂ©tiques et rĂ©elles de lavages de sol. Une nouvelle mĂ©thode sensible d'analyse du Tween 80, basĂ©e sur la fluorescence, est dĂ©veloppĂ©e pour suivre l'oxydation du Tween 80. Deux PEOAs sont comparĂ©s : l'Ă©lectro-Fenton (EF) et l'oxydation anodique (OA). Les anodes de platine (Pt) (dans le procĂ©dĂ© EF) et de diamant dopĂ©s au bore (BDD) (dans les deux procĂ©dĂ©s) sont respectivement utilisĂ©es pour Ă©tudier la recirculation des effluents et la possibilitĂ© d'une combinaison avec un post-traitement biologique. Concernant la rĂ©utilisation des agents extractants, l'Ă©volution de la biodĂ©gradabilitĂ© des solutions et l'Ă©nergie consommĂ©e (en kWh (kg COT)-1) pendant les PEAOs testĂ©s, l'HPCD est trouvĂ©e ĂȘtre plus avantageuse que le Tween 80. En revanche, en terme d'efficacitĂ© d'extraction, de coĂ»t des agents extractants et d'impact sur la respiromĂ©trie du sol, le Tween 80 paraĂźt ĂȘtre plus avantageux. En prenant en compte tous ces avantages et inconvĂ©nients, le Tween 80 pourrait ĂȘtre retenu comme la meilleure solutionSoils contaminated by hydrophobic organic pollutants like polycyclic aromatic hydrocarbons (PAHs) are a common concern since they are extremely difficult to remove and their potential toxicological impacts are significant. As an alternative to traditional thermal or physical treatments, soil washing and soil flushing processes appear to be conceivable and efficient approaches, especially for higher level of pollution. However, the treatment of highly loaded soil washing/flushing solutions is another challenge to overcome. In that way, a new integrated approach is suggested: soil washing/flushing processes combined to an electrochemical advanced oxidation process (EAOP) in a combination with a recirculation loop (to save extracting agents) and/or a biological post-treatment step (to minimize energy cost).Extraction efficiency of the extracting agent like hydroxypropyl-beta-cyclodextrin (HPCD) is compared to the traditional non-ionic surfactant Tween 80 in synthetic and real soil washing solutions. A new simple fluorescent sensitive and selective quantification method is developed to monitor Tween 80 oxidation. Two EAOPs were compared: electro-Fenton (EF) and anodic oxidation (AO). Platinum (Pt) (in EF process) and boron doped diamond (BDD) (in both treatment) anodes are the respective electrodes employed to recycle effluents and to consider a biological post-treatment, respectively. Regarding the extracting agent recovery, the biodegradability evolution of effluent and the energy consumption (in kWh (kgTOC)-1) during EAOP, HPCD is more advantageous than Tween 80. However, in terms of extraction efficiency, costs of extracting agents and impact on soil respirometry, Tween 80 is much more efficient. By considering all these advantages and drawbacks, Tween 80 could still appear to be the best optionPARIS-EST-UniversitĂ© (770839901) / SudocSudocFranceF
Advanced electrochemical wastewater treatment combined to CO2 conversion â Towards zero energy purification
Description sur l'historique de la collaboration dans le cadre du projet CNRS-NSFC avec l'université de Nankai (Chine
Traitement des eaux par procĂ©dĂ©s dâoxydation avancĂ©e - Oxydation anodique
International audienc
Elimination of pharmaceutics from municipal wastewater by nanofiltration coupled to electrochemical advanced oxidation process as complementary treatment
International audienc
An unprecedented route of âąOH radical reactivity: ipso-substitution with perhalogenocarbon compounds
International audienceHydroxyl radical (âąOH) is ubiquitous in the environment and in metabolism. It is one of the most powerful oxidants and can react instantaneously with surrounding chemicals. Currently, three attack modes of âąOH have been identified: hydrogen atom abstraction, addition to unsaturated bond and electron transfer. Perhalogenocarbon compounds such as CCl4 are therefore supposed to be recalcitrant to âąOH as suggested by numerous authors due to the absence of both hydrogen atom(s) and unsaturated bond(s). Here, we report for the first time a fourth attack mode of âąOH through ipso-substitution of the halogen atom. This breakthrough offers new scientific insight for understanding the mechanisms of âąOH oxidation in the related research areas of research. It is especially a great progress in organic contaminants removal from water. In this study, CCl4 is successfully degraded and mineralized in aqueous media using a green and efficient electrocatalytical production of homogeneous and heterogeneous âąOH. Maximum degradation rate of 0.298âŻminâ1 and mineralization yield of 82% were reached. This opens up new possibilities of emerging water pollutants elimination such as fluorosurfactants
Influence of Soil Washing on Iron Mobilization and Other Metals/Metalloids and Their Impacts on Biodegradability Enhancement during an Aqueous Advanced Electrochemical Treatment.
International audienc
Advanced ElectroâOxidation with BoronâDoped Diamond for Acetaminophen Removal from Real Wastewater in a Microfluidic Reactor: Kinetics and MassâTransfer Studies
International audienc
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