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Rezumat

ndeprtarea compuilor organici refractari din ape uzate nc reprezintunsubiect deinteres, cercetrile fiind concentrate pe identificarea unor procedee care

s fie eficiente att din punct de vedere tehnic ct i din punct de vedere economic.Astfel, combinarea unei prime etape de oxidare avansat, n care compuii inialsunt transformai n compui cu biodegradabilitate mare, cu o a doua etap deepurare biologic pare a fi o soluie eficient pentru rezolvarea acestei probleme.Optimizarea acestui procedeu de epurare impune un studiu amnunit alintermediarilor formai n etapa de oxidare avansat n scopul identificriimecanismelor de degradare a compuilor iniiali i a timpilor optimi de iradiere. nacestsens, n lucrarea de fa sunt prezentate rezultatele experimentale o binute cu privire la identificarea intermediarilor i amecanismelor de degradare a 2,4-

diclorfenolului din soluii apoase n procese de oxidare fotocatalitic utiliznddrept catalizator TiO2 depus pe suport de titan. Rezultateleobinute indic trei posibile mecanisme de degradare i anume mecanismul2-clorhidrochinonei,mecanismul 3,5-diclorcatecholuluii mecanismul4-clorfenolului. Aceste rezultatesunt n concordan cu rezultatele experimentale obinute n cadrul unor studiianterioare de epurare biologic efectuate pe soluii apoase de 2,4-diclorfenolrezultate la diferii timpi de iradiere n procesul fotocatalitic indicnd faptul cintermediarii formai sun uor biodegradabili i astfel uor de ndeprtat n etapa depurare biologic.

Abstract

Removal of refractory organic compounds from wastewater still representsan interesting topic, the research being focused on identifying some techniques thato be efficient from both technical and economic standpoint. Thus, combining of first-stage of advanced oxidation, in which the initial compounds are convertedinto compounds of higher biodegradability, with a second-stage of biologicaltreatment, appears to be an effective solution to this problem. Optimizing of thitreatment technique requires a detailed study of the intermediates formed in thfirst-stage of advanced oxidation in order to identify the degradation mechanismof initial compounds and the optimal times of irradiation. In this respect, the pape presents the experimental results regarding the identification of intermediates anmechanisms of degradation of 2,4-dichlorophenol in aqueous solutions during th process of photocatalytic oxidation using TiO2 as catalyst supported on titanium.

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The results indicate three possible mechanisms of degradation, namely themechanism of 2-chlorohydroquinone, the mechanism of 3,5-dichlorocatechol, anthe mechanism of 4-chlorophenol. These results are in good agreement with theexperimental results obtained in earlier studies regarding the biological treatmen

of 2,4-dichlorophenol at different times of irradiation, indicating that the resultedintermediates are readily biodegradable and therefore easily removed in thesecond-stage of biological treatment.