Solar photocatalytic treatment of landfill leachate using a solid mineral by-product as a catalyst.
The treatment of municipal solid waste landfill leachate in a pilot plant made up of solar compound parabolic collectors, using a solid industrial titanium by-product (WTiO(2)) containing TiO(2) and Fe(III) as a photocatalyst, was investigated. In the study evidence was found showing that the degradation performed with WTiO(2) was mainly due to the Fe provided by this by-product, instead of TiO(2). However, although TiO(2) had very little effect by itself, a synergistic effect was observed between Fe and TiO(2). The application of WTiO(2), which produced coupled photo-Fenton and heterogeneous catalysis reactions, achieved a surprisingly high depuration level (86% of COD removal), higher than that reached by photo-Fenton using commercial FeSO(4) (43%) in the same conditions. After the oxidation process the biodegradability and toxicity of the landfill leachate were studied. The results showed that the leachate biodegradability was substantially increased, at least in the first stages of the process, and again that WTiO(2) was more efficient than FeSO(4) in terms of increasing biodegradability.
Departamento de Ingeniería Química y Ambiental, Escuela Técnica Superior de Ingeniería, Universidad de Sevilla, Camino de los Descubrimientos s/n, 41092 Sevilla, Spain.
Rodrigo
R
Poblete
Lucia
L
Prieto-Rodríguez
Isabel
I
Oller
Manuel I
MI
Maldonado
Sixto
S
Malato
Emilia
E
Otal
Luis F
LF
Vilches
Constantino
C
Fernández-Pereira
D002384:Catalysis; D006861:Hydrogen Peroxide / Q000737:chemistry; D007220:Industrial Waste; D007501:Iron / Q000737:chemistry; D008903:Minerals / Q000737:chemistry*; D055668:Photochemical Processes; D012037:Refuse Disposal / Q000379:methods*; D012722:Sewage / Q000737:chemistry; D014025:Titanium / Q000737:chemistry; D018675:Toxicity Tests; D014466:Ultraviolet Rays
C045076:Fenton's reagent; D007220:Industrial Waste; D008903:Minerals; D012722:Sewage; C009495:titanium dioxide; D006861:Hydrogen Peroxide; D014025:Titanium; D007501:Iron