Abstract
Heterogeneous UV-photocatalytic process has been studied as tertiary treatment of real municipal wastewater. Wastewater photocatalytic treatment was carried out using several materials previously developed as photocatalysts: volcanic ashes and nanostructured titania supported over volcanic ashes. Both material activities in particles were compared with Degussa TiO2 (powder). Photocatalyst amount influence was studied by varying it between 2 and 10 g L−1. Wastewater decontamination process was evaluated measuring the chemical oxygen demand evolution with phototreatment time in order to choose the best photocatalytic material and its optimal operation concentration. Moreover, the photocatalytic results obtained were compared with those obtained from photolysis and adsorption studies in wastewater using the same operation conditions. In addition, analyses of main wastewater parameters were made in order to evaluate the complete water decontamination process. Possibility of using photocatalysts in particles shows the main advantage of continuous photocatalyst separation from the water effluent once the decontamination process has finished. Good photocatalytic activities were observed, and it allows to conclude that heterogeneous photocatalysis is an effective method for municipal wastewater treatment, achieving water disinfection and phosphates removal.
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References
Bekbölet M (1997) Photocatalytic bactericidal activity of TiO2 in aqueous suspensions of E. Coli. Water Sci Technol 35:95–100
Borges ME, Alvarez-Galván MC, Esparza P, Medina E, Martín-Zarza P, Fierro JLG (2008) Ti-containing volcanic ash as photocatalyst for degradation of phenol. Energy Environ Sci 1:364–369
Chuan X-Y, Hirano M, Inagaki M (2004) Preparation and photocatalytic performance of anatase-mounted natural porous silica, pumice, by hydrolysis under hydrothermal conditions. Appl Catal B 51:255–260
Esparza P, Borges ME, Díaz L, Álvarez-Galván MC, Fierro JLG (2010) Photodegradation of dye pollutants using new nanostructured titania supported on volcanic ashes. Appl Catal A 388:7–14
Fernández P, Blanco J, Sichel C, Malato S (2005) Water disinfection by solar photocatalysis using compound parabolic collectors. Catal Today 101:345–352
Kerzhentsev M, Guillard C, Herrmann JM, Pichat P (1996) Photocatalytic pollutant removal in water at room temperature: case study of the total degradation of the insecticide fenitrothion (phosphorothioic acid O, O-dimethyl-O- (3-methyl-4-nitro-phenyl) ester). Catal Today 27:215–220
Kositzi M, Poulios I, Malato S, Caceres J, Campos A (2004) Solar photocatalytic treatment of synthetic municipal wastewater. Water Res 38:1147–1154
Kuwahara Y, Yamashita H (2011) Efficient photocatalytic degradation of organics diluted in water and air using TiO2 designed with zeolites and mesoporous silica materials. J Mater Chem 21:2407–2416
Li XZ, Zhang M, Chua H (1999) Disinfection of municipal wastewater by sensitized photooxidation. Water Sci Technol 33:111–118
Li Y, Chen J, Liu J, Ma M, Chen W, Li L (2010) Activated carbon supported TiO2-photocatalysis doped with Fe ions for continuous treatment of dye wastewater in a dynamic reactor. J Environ Sci 22:1290–1296
Litter MI, Quici N (2010) Photochemical advanced oxidation processes for water and wastewater treatment. Rec Pat Eng 4:217–241
Lydakis-Simantiris A, Riga D, Katsivela E, Mantzavinos D, Xekoukoulotakis NP (2010) Disinfection of spring water and secondary treated municipal wastewater by TiO2 photocatalysis. Desalination 250:351–355
Mangalampalli V, Sharma P, Sadanandam G, Ratnamala A, Kumari VD, Subrahmanyam M (2009) An efficient and novel porous nanosilica supported TiO2 photocatalyst for pesticide degradation using solar light. J Hazard Mater 171:626–633
Peng Y-H, Huang G-F, Huang W-Q (2012) Visible-light absorption and photocatalytic activity of Cr-doped TiO2 nanocrystal films. Adv Powder Technol 23:8–12
Robert D, Malato S (2001) Solar photocatalysis: a clean process for water detoxification. Sci Total Environ 291:85–97
Soutsas K, Karayannis V, Poulios I, Riga A, Ntampegliotis K, Spiliotis X, Papapolymerou G (2010) Decolorization and degradation of reactive azo dyes via heterogeneous photocatalytic processes. Desalination 250:345–350
Van Grieken R, Marugán J, Sordo C, Martínez P, Pablos C (2009) Photocatalytic inactivation of bacteria in water using suspended and immobilized silver-TiO2. Appl Catal B Environ 93:112–118
Wong CL, Tan YN, Mohamed AR (2011) A review on the formation of titania nanotube photocatalysts by hydrothermal treatment. J Environ Manage 92:1669–1680
Wu RJ, Chen CC, Lu CS, Hsu PY, Chen MH (2010) Phorate degradation by TiO2 photocatalysis: parameter and reaction pathway investigations. Desalination 250:869–875
Bahadur N, Jain K, Srivastava AK, Govind, Gakhar R, Haranath D, Dulat MS (2010) Effect of nominal doping of Ag and Ni on the crystalline structure and photo-catalytic properties of mesoporous titania. Mater Chem Phys 124:600–608
Zhang L, He D, Jiang P (2009) MnO2-doped anatase TiO2—an excellent photocatalyst for degradation of organic contaminants in aqueous solution. Catal Commun 10:1414–1416
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Borges, M.E., Hernández, T. & Esparza, P. Photocatalysis as a potential tertiary treatment of urban wastewater: new photocatalytic materials. Clean Techn Environ Policy 16, 431–436 (2014). https://doi.org/10.1007/s10098-013-0637-z
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DOI: https://doi.org/10.1007/s10098-013-0637-z