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Plot of the ETA (η) values versus the input parameter values for tannery wastewater (pH1 = 3.0, pH2 = 9.0, K2FeO4(1) = 0.400 g/L, K2FeO4(2) = 1.200 g/L, Time(1) = 3.00 min, Time(2) = 9.00 min). The Envifer® dose was calculated based on pure K2FeO4. The dotted lines give the mean ± 2 × MS Error).
