Arsenic Removal from Natural Groundwater by Electrocoagulation Using Response Surface Methodology

Figure 9

(a) Contour surface plot and (b) response surface, showing the interactive effect of feedwater flow rate 𝑄 (0.25–1.00 L min⁻¹) and current density 𝑖 (5–20 A m⁻²) on the total potential drop 𝑈 measured in the EC reactor. (c) Contour surface plot and (d) response surface, showing the interactive effect between the independent variables, feedwater flow rate 𝑄 (0.25–1.00 L min⁻¹), and current density 𝑖 (5–20 A m⁻²) on the treatment time 𝑡 required to achieve an As concentration of 10 μg L⁻¹ during the EC process. (e) Surface contour plot and (f) surface response, showing the interactive effect of the independent variables, feedwater flow rate 𝑄 (0.25–1.00 L min⁻¹), and current density 𝑖 (5–20 A m⁻²) on energy consumption 𝐸 during the EC process.

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