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Journal of Applied Sciences
  Year: 2010 | Volume: 10 | Issue: 9 | Page No.: 731-737
DOI: 10.3923/jas.2010.731.737
 
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Polishing of Water Treated by a Biological Process with Heterogeneous Photocatalysis

G. Giovanni, Jose Pedro S. Valente, Pedro M. Padilha, Sonia M.A. Jorge, Margarida J. Saeki and Ariovaldo O. Florentino

Abstract:
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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How to cite this article:

G. Giovanni, Jose Pedro S. Valente, Pedro M. Padilha, Sonia M.A. Jorge, Margarida J. Saeki and Ariovaldo O. Florentino, 2010. Polishing of Water Treated by a Biological Process with Heterogeneous Photocatalysis. Journal of Applied Sciences, 10: 731-737.

DOI: 10.3923/jas.2010.731.737

URL: https://scialert.net/abstract/?doi=jas.2010.731.737

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