Caractérisation de l’effet d’un traitement au peroxyde d’hydrogène sur une boue. Application à la réduction de la production de boue

作者: Misael Murillo Murillo

DOI:

关键词: One shotSolubilizationContext (language use)Particulate organic matterActivated sludge systemIndustrial scaleForestryChemistryReduction ratioEconomic analysis

摘要: Dans le contexte actuel, les voies d’elimination des boues issues du traitement eaux usees sont soumises a contraintes multiples, notamment sociales, sanitaires et reglementaires. Des procedes couples, associant differentes technologies aux biologiques conventionnels, actuellement l’etude pour reduire cette production. Les d’oxydation chimiques, en particulier l’ozonation, semblent engendrer un taux de reduction la production (RPB) eleve. L’utilisation peroxyde d’hydrogene n’a ete que peu etudiee vis cet objectif alors qu’il presente priori certain nombre d’avantages par rapport l’ozone. Cette etude vise caracteriser analyser l’effet (H2O2) sur matiere d’une boue ainsi performances couplage d’un reacteur peroxydation systeme activee.En ferme, l’action H2O2 conduit solubilisation organique particulaire (mesuree comme COP) eleve qui depend temperature, entre 60°C 95°C. Plus 85% COP digerees est solubilise 95°C contre 20% une activee. A 95°C, nous avons varie conditions operatoires (pH initial, mode d’ajout , rajout Fe2+ catalyseur) afin determiner favorables tout maximisant l’efficacite d’action H2O2. Ces : pH initial 8, ponctuel T= L’ajout fer pas d’effet visible Le matieres minerales faible. De maniere surprenante, consommation toujours constant quel soit d’avancement reaction l’ensemble mises jeu. Une reactions competitives, autres existe donc. Etant donne nombreuses complexes envisageables avec H2O2, seules hypotheses mecanismes ont proposees. Le biologique-traitement chimique mis œuvre reacteurs ouverts. La caracterisation lors combine H2O2-traitement biologique permis constater RPB reproductible 50% reference dose 0,45gH2O2/gMVS non produites. mineralisation observee confirmant resultats precedents. Un modele existant adapte representer l’evolution variables procede combine. Avec ce concentrations DCO l’effluent MVS bassin d’activation correctement representees. Il sera necessaire neanmoins valider d’autres doses L’analyse economique montre cout produites utilisant prohibitif compte tenu actuel l’elimination boues. optimisation d’H2O2 utilisee, temperature travail mais aussi couts d’investissement avant d’envisager l’echelle industrielle In the current context, elimination ways of sludge resulting from wastewater treatment are subjected to social, sanitary and lawful constraints. Coupled processes, associating several conventional biological currently studied reduce this The chemical processes oxidation, in particular ozonization, seem generate high ratio (RSP). Concerning objective, hydrogen peroxide only was little whereas it presents some advantages compared ozone. aim study is characterization analysis effect on matter, as well coupling peroxidation system an activated system. action closed reactor, leads rate solubilization particulate organic matter (measured Particulate Organic Carbon) which depends tested between More than POC digested solubilized at for sludge. At operating (initial pH, addition Fe 2+ like catalyst) were varied order determine favorable solubilization, maximizing effectiveness action. These are: 8 one shot. iron has not effectiveness. mineral observed. Surprisingly, consumption always whatever all conditions. Thus, reactions, competitive exists. Hypotheses mechanisms proposed, given many possible complex with chemical- treatments by carried out open reactors. time combined biological-H2O2 made observe reproducible RSP amount 0,45gH2O2/gVSS. mineralization observed confirming preceding results. An existing model adapted represent evolution processes. With COD effluent VSS basin activation correctly represented. Nevertheless, will be necessary validate other amounts economic process shows that cost produced using prohibitive taking into account optimization used, but also capital costs consider industrial scale

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