Catalytic Ozonation Using Fe²⁺ 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 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...