The performance of an electrochemical reduction process was investigated for the treatment Cr(VI)-containing electroplating wastewater using a continuous-flow scrap iron packed column as an sacrificial anode. The effects of the key operating parameters including hydraulic retention time (HRT), current supply ratio (CSR), and inlet Cr(VI) concentration were systematically studied. With a fixed CSR of 106%, the HRT has no impact on Cr(VI) removal, but energy consumption increased with decreasing HRT. A complete Cr(VI) removal was obtained with a final ORP of approximately −100 mV. Increasing the inlet Cr(VI) concentration caused an inefficient removal efficiency of Cr(VI) with an increases in ORP. In contrast, Cr(VI) removal remained virtually unchanged, but ORP was dramatically decreased, when the influent Cr(VI) concentration decreased. Continuous and complete Cr(VI) reduction via electrochemical reactions can be achieved by the ORP range of −200 to −100 mV. The operating cost using continuous flow treatments with HRT of 60 min required less than batch reactor treatment around 40–57%.

使用连续流动的废铁填充柱作为牺牲阳极，研究了电化学还原工艺处理含六价铬电镀废水的性能。系统地研究了包括水力停留时间 (HRT)、电流供应比 (CSR) 和入口 Cr(VI) 浓度在内的关键操作参数的影响。在固定的 CSR 为 106% 的情况下，HRT 对 Cr(VI) 的去除没有影响，但能耗随着 HRT 的降低而增加。以大约 -100 mV 的最终 ORP 获得了完全的 Cr(VI) 去除。随着 ORP 的增加，增加入口 Cr(VI) 浓度会导致 Cr(VI) 的去除效率低下。相比之下，当进水 Cr(VI) 浓度降低时，Cr(VI) 去除率几乎保持不变，但 ORP 显着降低。通过 -200 至 -100 mV 的 ORP 范围，可以通过电化学反应实现连续和完全的 Cr(VI) 还原。使用 HRT 为 60 分钟的连续流处理所需的运行成本比间歇式反应器处理少约 40-57%。