Polishing of water treated by a biological process with heterogeneous photocatalysis
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Data
2010-04-20
Autores
Giovanni, Giovana [UNESP]
Valente, José Pedro Serra [UNESP]
Padilha, Pedro Magalhães [UNESP]
Jorge, Sônia Maria Alves [UNESP]
Saeki, Margarida Juri [UNESP]
Florentino, Ariovaldo de Oliveira [UNESP]
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Resumo
Effluent from a vegetal extraction plant situated in the region of Botucatu, state of São Paulo, Brazil was treated by combining a biological process and heterogeneous photocatalysis. The biologically pretreated effluent was polished by heterogeneous photocatalysis on a laboratory scale, using TiO2 in suspension as catalyst. The heterogeneous photocatalysis experiments were carried out with natural pH (~7.5) and pH adjusted to 3 and 4. An analysis was made to ascertain how the addition of potassium persulfate inhibited the recombination of the e-/h+ pair and incremented the generation of hydroxyl radicals. Coagulation-flocculation to remove the catalyst in suspension reduced the effluent 's initial turbidity of more than 4000 NTU to 2 NTU in 30 min. The photocatalysis reduced the sample 's initial TOC (Total Organic Carbon) from about 40 mg L-1 (in O2 demand) to approximately 3 mg L-1 in 180 min, rapidly removing the odors from the sample and disinfecting the water.
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Heterogeneous photocatalysis, Vegetal extraction, Coagulation-flocculation, TiO2, Combined process, Biological treatment
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Journal of Applied Sciences, v. 10, n. 9, p. 731-737, 2010.