Pollutant Removal from Wastewater at Different Stages of the Tanning Process by Electrocoagulation

Figure 4

Removal efficiency of COD for an EC process with (a) Fe electrode and (b) Al electrode. Conditions: pH 7.0; S2 (tanning), S3 (retanning), and S4 (mixture) wastewater; electrolysis time = 60 min.

(a)

(b)