Catalytic Ozonation Using Fe 2+ in the Treatment of Dairy Effluent in a Semi-Batch Process with Recycle

This work describes the treatment of dairy industry effluent using catalytic ozonation with Fe 2+ as its catalyst in a semi-batch process with recycle. A fractional factorial design 24 -1 was used with a reduction percentage of total organic carbon (TOCred) as response. Optimal conditions were obtai...

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Bibliographic Details
Published in:Journal of the Brazilian Chemical Society 2015-07, Vol.26 (7), p.1509-1519
Main Authors: Messias, Raquel A., Izário Filho, Hélcio José, Ferreira, Guilherme A., Silva, Otávio A., Siqueira, Adriano F., Alcântara, Marco A. K.
Format: Article
Language:eng ; por
Subjects:
CHEMISTRY, MULTIDISCIPLINARY
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Summary:This work describes the treatment of dairy industry effluent using catalytic ozonation with Fe 2+ as its catalyst in a semi-batch process with recycle. A fractional factorial design 24 -1 was used with a reduction percentage of total organic carbon (TOCred) as response. Optimal conditions were obtained by the reaction time of 30 min, ozonator power of 35 W, O 2 flow rate of 0.125 L min -1 , Fe 2+ concentration of 1.0 g L -1 and pH 4.0 for a 2 L raw effluent. TOCred of 64.03% represents a decrease in concentration from 473.0 to 170.1 mg L -1 , with an estimate cost of US$ 0.03 L -1 effluent. The treatment performed was not sufficient to discharge it directly on surface water; however, significant reduction of TOCred, among physical and chemical characteristics makes a better product to be proceeded into a biological treatment.
ISSN:0103-5053
1678-4790
DOI:10.5935/0103-5053.20150120