Optimization of iron electrocoagulation parameters for enhanced turbidity and chemical oxygen demand removal from laundry greywater.

Additionally, the quadratic term X 1 2 and interaction term X 1 X 2 were included due to their marginal significance (F-values of 4.53 and 4.46, p-values of 0.0529 and 0.0547, respectively), reflecting their potential impact on the model.

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Equation ( 2 ) includes only those terms that were found to be significant, very significant, or marginally significant based on their p-values and F-values (Table 6 ).

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