title: Migration of PAHs in food industry sludge to the air during removal by UV and TiO2.
abstract: This study was conducted to investigate the evaporation ratios of polycyclic aromatic hydrocarbons (PAHs) from the food industry treatment sludge. Five PAH compounds having different ring numbers were targeted. The effects of temperature, UV and TiO2 on PAH evaporation were also studied. All applications were performed in a specially designed apparatus. The air in the apparatus was vacuumed to collect the evaporated PAHs on the PUF cartridges. Then, these PUF cartridges were extracted for determination of PAHs. The PAH concentrations were measured by a gas-chromatography mass-spectrometer (GC-MS). 91% of the initial ∑5 PAHs in the sludge was evaporated into the air at the end of the UV application. However, this value decreased to 21% when UV was not employed. Initial and final PAH levels in the sludge were measured to determine the removed PAHs which refer to the addition of degraded and evaporated PAHs. The results indicated that the UV-TiO2 application at high temperatures was considered an appropriate PAH removal method because it restricted the evaporation of PAHs while it removed high levels of PAHs. PAHs were mainly removed from the sludge by degradation rather than evaporation with this application.
authors.affiliation: Department of Environmental Engineering, Faculty of Engineering, Uludag University, 16059 Nilüfer, Bursa, Turkey. Electronic address: geker@uludag.edu.tr.
authors.forename: Gizem
authors.initials: G
authors.lastname: Karaca
authors.affiliation: Department of Environmental Engineering, Faculty of Engineering, Uludag University, 16059 Nilüfer, Bursa, Turkey. Electronic address: tasdemir@uludag.edu.tr.
authors.forename: Yücel
authors.initials: Y
authors.lastname: Tasdemir
mesh_terms: D000393:Air Pollutants / Q000032:analysis / Q000737:chemistry*; D019649:Food Industry; D007220:Industrial Waste / Q000032:analysis*; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*; D014466:Ultraviolet Rays; D014865:Waste Disposal, Fluid / Q000379:methods*
chemical_list: D000393:Air Pollutants; D007220:Industrial Waste; D011084:Polycyclic Aromatic Hydrocarbons; C009495:titanium dioxide; D014025:Titanium
keywords: Evaporation; Photo-catalyst; Temperature; Treatment sludge