The agitation was a significant factor for achieving the high performance of electrocoagulation (EC) system. The different agitations of stirring and aeration were implied to the hybrid EC system with the aim of maximizing the industrial wastewater treatment in a short electrolytic time. The coolant wastewater from an aluminum product industry was represented as industrial wastewater in this work. The hybrid stirring-aeration EC system obtained a lower COD removal rather than the stirring EC system and the aeration EC system. Although the aeration can cause the increasing COD removal due to complete circulation and effective coagulant of Fe(OH)3 formation, however the combination of aeration and stirring negatively affected the EC performance. The possible reason was that the excessive agitation led to a rapid mixing of the solution, then the coagulants and pollutants obtained insufficient time to form as flocs to precipitate. The best EC performance was observed in the aeration EC system, and followed by stirring EC system, control system (without agitations) and the stirring-aeration EC system respectively in the short electrolytic time of 15 min. In addition, all EC systems could reach the excellent COD removal of 90% when the electrolytic time was sufficient (e.g., 45 min for the stirring-aeration EC system). Furthermore, the decreasing number of electrodes was affected on the COD removal efficiency, whereas the NaCl additive was insignificantly effected.

中文翻译：

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磁力搅拌曝气对实际工业处理电凝性能的评价

搅拌是实现电凝 (EC) 系统高性能的重要因素。混合 EC 系统暗示了搅拌和曝气的不同搅拌方式，目的是在较短的电解时间内最大限度地处理工业废水。本工作以铝制品行业的冷却液废水为工业废水。混合搅拌-曝气 EC 系统获得的 COD 去除率低于搅拌 EC 系统和曝气 EC 系统。尽管由于完全循环和 Fe(OH)3 形成的有效混凝剂，曝气可导致 COD 去除增加，但曝气和搅拌的结合对 EC 性能产生负面影响。可能的原因是过度搅拌导致溶液快速混合，然后凝结剂和污染物没有足够的时间形成絮凝物沉淀。在 15 min 的短电解时间内观察到最好的 EC 性能在曝气 EC 系统中，其次是搅拌 EC 系统、控制系统（无搅拌）和搅拌曝气 EC 系统。此外，当电解时间足够时（如搅拌曝气 EC 系统为 45 分钟），所有 EC 系统都可以达到 90% 的优异 COD 去除率。此外，电极数量的减少对 COD 去除效率有影响，而 NaCl 添加剂的影响不显着。控制系统（无搅拌）和搅拌曝气 EC 系统分别在 15 分钟的短电解时间。此外，当电解时间足够时（如搅拌曝气 EC 系统为 45 分钟），所有 EC 系统都可以达到 90% 的优异 COD 去除率。此外，电极数量的减少对 COD 去除效率有影响，而 NaCl 添加剂的影响不显着。控制系统（无搅拌）和搅拌曝气 EC 系统分别在 15 分钟的短电解时间。此外，当电解时间足够时（如搅拌曝气 EC 系统为 45 分钟），所有 EC 系统都可以达到 90% 的优异 COD 去除率。此外，电极数量的减少对 COD 去除效率有影响，而 NaCl 添加剂的影响不显着。