Abstract
The application of electrocoagulation (EC) and electroflotation (EF) was investigated for the treatment of poultry slaughterhouse wastewater in a bench scale unit cell electrolyzer with different EC-to-EF ratios at current densities of 3, 9, and 15 mA cm−2. The EC-to-EF ratio was controlled by current reversal using aluminum and graphite electrodes. The electrochemical treatment showed satisfactory removal efficiencies for Al coagulant loads greater than 51.8 mg L−1. The 4/5 EC to EF ratio (69.1 mg L−1 Al and 32.2 NmL L−1 additional EF gas) and 3/5 (51.8 mg L−1 Al/64 NmL L−1 additional EF gas) presented the best results for the removal of COD (76–85%), color (93–99%), and turbidity (95–99%), with the additional benefit of reducing the electrode consumption and sludge disposal costs proportionally to the EC-to-EF ratio. The effects of the EC-to-EF ratio and the current density on efficiency of the electrochemical treatment for the removal of COD, apparent color, turbidity, TSS, TSD, and NH3-N were discussed in the light of the physicochemical and electrochemical processes underlying the removal mechanism for each parameter. In particular, the blow-off mechanism seems to play an important role in the NH3-N removal, whereas indirect electrooxidation mechanism accounts for a fraction of the soluble COD removal for the electrodes configuration used in the treatment.
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Paulista, L.O., Presumido, P.H., Theodoro, J.D.P. et al. Efficiency analysis of the electrocoagulation and electroflotation treatment of poultry slaughterhouse wastewater using aluminum and graphite anodes. Environ Sci Pollut Res 25, 19790–19800 (2018). https://doi.org/10.1007/s11356-018-2184-y
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DOI: https://doi.org/10.1007/s11356-018-2184-y