Departamento de Engenharia Ambiental, Universidade Tecnológica Federal do Paraná - Campus Londrina, Av. dos Pioneiros 3131, Londrina, PR, 86036-370, Brazil.
Departamento de Química, Universidade Tecnológica Federal do Paraná - Campus Londrina, Av. dos Pioneiros 3131, Londrina, PR, 86036-370, Brazil.
Environ Sci Pollut Res Int. 2018 Jul;25(20):19790-19800. doi: 10.1007/s11356-018-2184-y. Epub 2018 May 8.
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. 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. The 4/5 EC to EF ratio (69.1 mg L Al and 32.2 NmL L additional EF gas) and 3/5 (51.8 mg L Al/64 NmL L 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 NH-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 NH-N removal, whereas indirect electrooxidation mechanism accounts for a fraction of the soluble COD removal for the electrodes configuration used in the treatment.
采用电凝聚（EC）和电浮选（EF）技术，在电流密度为 3、9 和 15 mA/cm 的实验室规模单元电解槽中，用不同的 EC 与 EF 比值处理家禽屠宰废水。EC 与 EF 的比值通过电流反转用铝和石墨电极来控制。电化学处理对 Al 混凝剂负荷大于 51.8 mg/L 的去除效率较高。4/5 的 EC 与 EF 比值（69.1 mg/L Al 和 32.2 NmL/L 外加 EF 气体）和 3/5（51.8 mg/L Al/64 NmL/L 外加 EF 气体）对 COD（76-85%）、颜色（93-99%）和浊度（95-99%）的去除效果最佳，同时还能相应地降低电极消耗和污泥处置成本，与 EC 与 EF 的比值成比例。根据每种参数去除机制背后的物理化学和电化学过程，讨论了 EC 与 EF 比值和电流密度对电化学处理去除 COD、表观颜色、浊度、TSS、TSD 和 NH-N 效率的影响。特别是吹脱机制似乎在 NH-N 去除中起着重要作用，而对于所用电极配置的可溶性 COD 去除，间接电氧化机制占一定比例。
