Catalytic Ozonation Using Fe²⁺ in the Treatment of Dairy Effluent in a Semi-Batch Process with Recycle

AUTOR(ES)

Messias, Raquel A., I. Filho, Hélcio J., Ferreira, Guilherme A., Silva, Otávio A., Siqueira, Adriano F., Alcântara, Marco A. K.

FONTE

J. Braz. Chem. Soc.

DATA DE PUBLICAÇÃO

2015-07

RESUMO

This work describes the treatment of dairy industry effluent using catalytic ozonation with Fe²⁺ 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, O₂ flow rate of 0.125 L min^-1, Fe²⁺ 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^-1effluent. 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.

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