Naturally occurring arsenic enrichment in groundwater poses a huge threat to human health. Air cathode electrocoagulation (ACEC) has recently been proposed to enhance As(III) oxidation and lower energy consumption. In this study, ACEC, EC/O₂ and EC/N₂ were evaluated with different current densities from 1 to 8 mA/cm² to investigate the effect on As(III) removal in different redox environments. Current density had no appreciable effect on arsenic removal efficiency given the same charge in ACEC because the concentration ratio of Fe/H₂O₂ under different current densities remained stable. However, in EC/O₂ and EC/N₂, As(III) removal was inhibited at higher current densities (4–8 mA/cm²), likely because more Fe(II) competed with As(III) for the oxidant, leading to less effective oxidation of As(III). In all EC systems, the ·OH units generated per power consumption reached the highest value at the lowest current density. Compared with other EC systems, the ACEC system showed lower energy consumption at all current densities due to the low energy consumption of the electrode reaction and more free radical generation. A lower current density saved more energy at the expense of time, showing the trade-off relationship between energy consumption and removal time. The operation costs for As(III) removal under optimal conditions were calculated as 0.028 $/m³ for ACEC, 0.030 $/m³ for EC/O₂, and 0.085 $/m³ for EC/N₂

地下水中天然存在的砷富集对人类健康构成了巨大威胁。最近已提出空气阴极电凝（ACEC）以增强As（III）的氧化并降低能耗。在这项研究中，以1至8 mA / cm ^2的不同电流密度评估了ACEC，EC / O ₂和EC / N ₂，以研究在不同氧化还原环境中对去除As（III）的影响。由于在不同电流密度下，Fe / H ₂ O ₂的浓度比保持稳定，因此在ACEC中相同的电荷下，电流密度对砷的去除效率没有明显影响。但是，在EC / O ₂和EC / N _2中，在较高的电流密度（4–8 mA / cm ²）下，As（III）的去除受到抑制，这可能是因为更多的Fe（II）与As（III）竞争了氧化剂，导致As（III）的有效氧化作用降低。在所有EC系统中，每单位功耗产生的·OH单位在最低电流密度下达到最高值。与其他EC系统相比，ACEC系统在所有电流密度下均显示出较低的能量消耗，这是由于电极反应的能量消耗较低且自由基产生更多。较低的电流密度以时间为代价节省了更多的能量，这表明了能耗与清除时间之间的权衡关系。操作对As（III）的去除最佳条件下的成本计算为0.028 $ /米³为ACEC，0.030 $ /米³EC / O _2的价格为0.085 $ / m ³，EC / N _2的价格为0.085 $ / m ³