In this study, an electrochemical–adsorption (ECA) system was constructed by packing iron particles and zeolites between electrodes to simultaneously remove nitrate and its by-products without excessive active chloride accumulation. Response surface methodology (RSM) with Box–Behnken design (BBD) was applied to investigate the effects of independent variables (iron particle, zeolite and current density) and their interaction on the system performance, also determining its optimum working state. The optimal conditions for the amount of iron particles (19.74 g) and zeolites (28.19 g) as well as the current density (18.72 mA/cm²) resulted in a high nitrate removal efficiency of 95% and merely a little ammonia accumulation. Polarized iron particles could provide more reactive sites and increase mass transfer efficiency, thus promoted nitrate reduction and decreased energy consumption. Synergistic effects of electrolysis and zeolite adsorption accelerated ammonium removal by increasing the rate of ion directional migration. The system having low operation costs and no secondary pollution appeared to be an advisable enhancing strategy for removing nitrate and by-products.

在这项研究中，通过在电极之间堆积铁颗粒和沸石来构建电化学吸附（ECA）系统，以同时去除硝酸盐及其副产物，而不会过多地积聚活性氯。采用Box–Behnken设计（BBD）的响应面方法（RSM）来研究自变量（铁颗粒，沸石和电流密度）的影响及其对系统性能的影响，并确定其最佳工作状态。铁颗粒（19.74 g）和沸石（28.19 g）以及电流密度（18.72 mA / cm ²）的最佳条件）导致95％的高硝酸盐去除效率和仅少量的氨积累。极化的铁颗粒可以提供更多的反应性位点并提高传质效率，从而促进硝酸盐的还原并降低能耗。电解和沸石吸附的协同作用通过增加离子定向迁移的速率来加速铵的去除。具有低运行成本且无二次污染的系统似乎是去除硝酸盐和副产物的可取的增强策略。