title: Impact of ultrasound application on oxidative desulphurization of diesel fuel and on treatment of resulting wastewater.
abstract: The ultrasound-assisted oxidative desulphurization (UAOD) process of diesel fuel has gained growing attention due to the strict regulation of sulphur content in the fuel. The goal of the present study was to investigate the impact of ultrasound (US) application for oxidative desulphurization (ODS) of hydrocarbon fuels and for the subsequent treatment of produced wastewater, since sonochemical processes are a new and interesting area of research with wide application in the field of environmental engineering. For that purpose, the model diesel fuel with initial sulphur concentration of 1220-3976 mg l(-1) was used for ODS and UAOD tests, and hydrogen peroxide/acetic acid was applied as the oxidant/catalyst system, respectively. The comparison of the process performance revealed that US significantly reduced the oxidation reaction time. The conversions of dibenzothiophene during 30 min of ODS and UAOD tests were 36% and 87%, respectively. Moreover, subsequent extraction with acetonitrile resulted in the final sulphur removal of 96.5%. The obtained results clearly indicated that UAOD process is beneficial for effective sulphur removal from the model diesel fuel. Furthermore, subsequent experiments included the application of the sono-Fenton process for resulting wastewater treatment. Monitoring of dibenzothiophene sulphone concentration and total organic carbon during the sono-Fenton treatment of wastewater revealed the decrease of 70-75% and 53-66%, respectively. The hypothesis on the possibility of degradation of dibenzothiophene sulphone by •OH radicals was confirmed by observed generation of benzoic acid and aliphatic carboxylic acids during experiments. Accordingly, the wastewater was purified to a satisfactory degree, enabling the reuse of treated water.
authors.affiliation: a Department of Measurements and Process Control , University of Zagreb , Zagreb , Croatia.
authors.forename: Dunja
authors.initials: D
authors.lastname: Margeta
authors.affiliation: b Department of Polymer Engineering and Organic Chemical Technology , University of Zagreb , Zagreb , Croatia.
authors.forename: Ivana
authors.initials: I
authors.lastname: Grčić
authors.affiliation: b Department of Polymer Engineering and Organic Chemical Technology , University of Zagreb , Zagreb , Croatia.
authors.forename: Sanja
authors.initials: S
authors.lastname: Papić
authors.affiliation: c Petroleum and Petrochemical Department , University of Zagreb , Zagreb , Croatia.
authors.forename: Katica
authors.initials: K
authors.lastname: Sertić-Bionda
authors.affiliation: d Department of Industrial Ecology, Faculty of Chemical Engineering and Technology , University of Zagreb , Zagreb , Croatia.
authors.forename: Lucija
authors.initials: L
authors.lastname: Foglar
mesh_terms: D005742:Gasoline / Q000032:analysis* / Q000528:radiation effects*; D010084:Oxidation-Reduction; D013010:Sonication; D013455:Sulfur / Q000737:chemistry*; D062065:Wastewater / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D005742:Gasoline; D013455:Sulfur; D062065:Wastewater
keywords: Fenton process; Sono-Fenton process; dibenzothiophene; ultrasound-assisted oxidative desulphurization; wastewater