![]() When the system was used to treat actual plating wastewater, 92.1% of Ni-EDTA was removed and 88.7% was recovered. When the electrolyte Na 2SO 4 concentration, current density and initial Ni-EDTA concentration were 0.2 mol/L, 16 mA/cm mg/L, respectively, 99.0% of Ni-EDTA was removed after 32 h. The stable structure of Ni-EDTA can be destroyed by H + produced by the bipolar membrane to obtain free Ni 2+, which can combine with OH − produced by the bipolar membrane to form Ni(OH) 2. In this study, a bipolar membrane electrodialysis system was used to recover Ni in the form of Ni(OH) 2 from plating wastewater containing Ni–ethylenediaminetetraacetic acid (Ni-EDTA) without adding chemical reagents. It is difficult to remove this Ni using traditional chemical precipitation technology. ![]() Ni is often present in plating wastewater as a complexing state. ![]()
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