Reverse osmosis concentrate (ROC) from wastewater reclamation has posed significant disposal challenges due to its highly concentrated NH₃-N, chloride ion and bio-refractory organics, and developing technologies for their removal are essential. Herein, we developed an efficient electrochemical system to remove total nitrogen and dissolved organic compound (DOC) simultaneously mediated by chlorine radical (Cl•), which is generated by activation of chloride ion existing in ROC on an inexpensive, three-dimensional Co₃O₄ nanowires. Results showed that the total nitrogen and total organic carbon removal were 98.2% and 56.9% in 60 min for synthetic ROC with 56 mg/L of NH₃-N and 20 mg/L of DOC. The utilization of Co₃O₄ nanowires enhanced NH₃-N degradation by 2.58 times compared with Co₃O₄ nanoplates, which were 1.69 and 17.5 times these of RuO₂ and Pt. We found that structural Co³⁺/Co²⁺ acts as cyclic catalysis to produce Cl• via single-electron transfer, which convert NH₃-N to N₂ and lead to faster DOC degradation. This architecture provides abundant catalytic sites and sufficient accessibility of reactants. Small amount of nitrate generated by oxidation of NH₃-N was further reduced to N₂ on Pd-Cu/NF cathode. These findings provide new insights for utilization of waste Cl^– and development of novel electrochemical system for ROC disposal.

来自废水回收的反渗透浓缩液 (ROC) 因其高浓度的 NH ₃ -N、氯离子和生物难降解有机物而带来了巨大的处理挑战，因此开发去除它们的技术至关重要。在此，我们开发了一种有效的电化学系统，可同时去除由氯自由基 (Cl•) 介导的总氮和溶解有机化合物 (DOC)，氯自由基是通过在廉价的三维 Co ₃ O上激活 ROC 中存在的氯离子而产生的。 ₄纳米线。结果表明，NH ₃ -N  56 mg/L、20  毫克/升 DOC。与Co _{3 O 4 纳米片相比，Co 3} O _4纳米线_的使用增强了NH ₃ -N降解2.58倍，分别是RuO ₂和Pt的1.69倍和17.5倍。我们发现结构Co ³⁺ /Co ²⁺作为循环催化通过单电子转移产生Cl•，将NH ₃ -N 转化为N ₂并导致更快的DOC 降解。这种结构提供了丰富的催化位点和足够的反应物可及性。_{NH 3} -N氧化生成的少量硝酸盐进一步还原为N ₂在 Pd-Cu/NF 阴极上。^{这些发现为废物 Cl的}利用和开发用于 ROC 处理的新型电化学系统提供了新的见解。