Photocatalytic degradation of actual textile industrial wastewater in aqueous suspensions of polycrystalline TiO2.
Heterogeneous photocatalytic oxidation of contaminants present in wastewater produced by a textile industry was carried out. The samples were withdrawn from the plant before and after a traditional biological treatment. The effluents were named A and A' (before the biological treatment), B and B' (after the biological treatment). Polycrystalline TiO2 (Degussa P25) was used as the catalyst in a batch photoreactor with immersed lamp. An almost complete decolorization was observed after about 0.5 divided by 1 hours for both kinds of effluents, but the decrease of the total organic carbon (TOC) concentration occurred more slowly. The influence of some chemical oxidants, i.e. ozone, hydrogen peroxide and peroxydisulfate on the photo-oxidation rate was also investigated. After addition of H2O2 or S2O8(2-) TOC decreased more quickly only for B and B'. The runs performed by using O3 as bubbling gas showed a mineralization rate higher than that observed in the presence of O2.
Augugliaro
Vincenzo
V
Dipartimento di Ingegneria Chimica dei Processi e dei Materiali, Università di Palermo, Viale delle Scienze 90128 Palermo, Italy.
Ciardelli
Gianluca
G
Corsi
Leopoldo
L
García-López
Elisa
E
Loddo
Vittorio
V
Marcí
Giuseppe
G
Palmisano
Leonardo
L
Schiavello
Mario
M
D002384:Catalysis; D004396:Coloring Agents; D006861:Hydrogen Peroxide / Q000737:chemistry; D007220:Industrial Waste; D010126:Ozone / Q000737:chemistry; D010777:Photochemistry; D013783:Textile Industry; D014025:Titanium / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical; D018508:Water Purification / Q000379:methods*
D004396:Coloring Agents; D007220:Industrial Waste; D014874:Water Pollutants, Chemical; C009495:titanium dioxide; D010126:Ozone; D006861:Hydrogen Peroxide; D014025:Titanium