Treatment of Ni-EDTA containing wastewater by electrocoagulation using iron scraps packed-bed anode.

摘要: The unique electrocoagulator proposed in this study is highly efficient at removing Ni-EDTA, providing a potential remediation option for wastewater containing lower concentrations of Ni-EDTA (Ni ≤ 10 mg L−1). In the electrocoagulation (EC) system, cylindrical graphite was used as cathode, and packed-bed formed from iron scraps an anode. results showed that removal increased with application current favoured acidic conditions. We also found scrap anode superior its treatment ability specific energy consumption (SECS) compared rod addition, packed density temperature had large influence on (ECS). Over 94.3% Ni 95.8% TOC were removed when conducting EC applied 0.5 A, initial pH 3, air-purged rate 0.2 L min−1, 400 kg m−3 313 K time 30 min. SEM analysis indicated area after EC. XRD flocs produced during revealed hematite (α-Fe2O3) magnetite (Fe3O4) main by-products under aerobic anoxic conditions, respectively. A kinetic demonstrated followed first-order model parameters. Moreover, efficiency real essentially consistent synthetic wastewater.