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Table 5

Different parameter levels and responses for each experiment in the steepest ascent method

Stepx1x2ξ1ξ2y (COD removal efficiency) (%)
PredictedExperimental
Origin 0.00 0.00 12.50 7.00 67.80 65.85 
Origin + Δ 0.50 − 0.74 1.25 − 1.48 … … 
Origin + 2Δ 0.50 − 0.74 13.75 5.52 74.43 79.36 
Origin + 3Δ 1.00 − 1.48 15.00 4.04 81.07 84.65 
Origin + 3Δ 1.50 − 2.22 16.25 2.56 87.70 … 
… 1.35 − 2.00 15.88 3.00 85.72 82.53 
Stepx1x2ξ1ξ2y (COD removal efficiency) (%)
PredictedExperimental
Origin 0.00 0.00 12.50 7.00 67.80 65.85 
Origin + Δ 0.50 − 0.74 1.25 − 1.48 … … 
Origin + 2Δ 0.50 − 0.74 13.75 5.52 74.43 79.36 
Origin + 3Δ 1.00 − 1.48 15.00 4.04 81.07 84.65 
Origin + 3Δ 1.50 − 2.22 16.25 2.56 87.70 … 
… 1.35 − 2.00 15.88 3.00 85.72 82.53 
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