The membrane concentrate from landfill leachate has great potential risks of the environmental pollution. The aim of this study was to investigate the structure effect of stacked electro-Fenton (EF) reactor on the nanofiltration (NF) concentrate treatment from landfill leachate. The stacked EF reactor was constructed with a carbon-PTFE gas diffusion cathode and an IrO₂-Ta₂O₅ anode with different electrode spacings (i.e., 2, 5, 10, and 40 mm) and electrode pairs (i.e., 1, 3, 6, and 9). Results showed that smaller electrode spacing and more electrode pairs in the stacked EF reactor improved the COD removal in the NF concentrate treatment. The specific energy consumption decreased with smaller electrode spacing but increased with more electrode pairs. Under the current density of 15 mA∙cm^-2, Fe²⁺ dosage of 560 mg∙L^-1, the stacked EF reactor with 9 electrode pairs and the electrode spacing of 2 mm removed 71 ± 6% of the total COD in the NF concentrate within 6 h and the specific energy consumption was 207 ± 20 kWh∙kg COD^-1. The COD removal was kept stable in the stacked EF reactor within 3 cycles of operation. Three-dimensional fluorescence spectroscopic and gas chromatographic mass spectrometric analysis showed that humic acids and aromatic proteins were efficiently degraded in the EF process and large amount of aromatic hydrocarbons was detected in the treated NF concentrate. Our stacked EF reactor could be used to treat leachate concentrates with effectively degradation of the refractory organic pollutants.

垃圾渗滤液中的膜浓缩物具有很大的潜在环境污染风险。这项研究的目的是研究堆放式电子芬顿（EF）反应器对垃圾渗滤液中纳滤（NF）精矿处理的结构效果。堆叠式EF反应器由碳-PTFE气体扩散阴极和IrO ₂ -Ta ₂ O _5构成具有不同电极间距（即2、5、10和40 mm）和电极对（即1、3、6和9）的阳极。结果表明，堆叠式EF反应器中较小的电极间距和更多的电极对可改善NF浓缩液处理中的COD去除率。比能量消耗随着电极间距的减小而减小，但随着电极对的增加而增大。在电流密度为15 mA∙cm ^-2，Fe ²⁺剂量为560 mg∙L ^{-1的情况下}，带有9对电极且电极间距为2 mm的堆叠式EF反应器去除了COD的71±6％ NF在6小时内浓缩，单位能耗为207±20 kWh∙kg COD ^-1。在3个操作周期内，堆叠式EF反应器中的COD去除量保持稳定。三维荧光光谱和气相色谱质谱分析表明，在EF过程中，腐殖酸和芳族蛋白质被有效降解，并且在处理过的NF浓缩物中检测到大量的芳烃。我们的堆叠式EF反应器可以有效地降解难处理的有机污染物，用于处理沥滤液精矿。