A novel boron-doped diamond (BDD) flow-through cell was used to evaluate the electrochemical oxidation of perfluoroalkyl acids (PFAAs) in landfill leachates. Six different leachates with a concentration of individual PFAAs in the range of 10² − 10⁴ ng/L were treated. The performance of the flow-through cell was assessed and compared with synthetic solutions for the oxidation of two representative PFAAs: perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS). Subsequently, the effect of current density and the variability of leachates composition was investigated for the electrochemical oxidation of PFAAs in real landfill leachates. Non-detect levels and >90% degradation was reached for PFOS and PFOA after 2 h of treatment for all leachates tested. Decreasing trends for perfluoroheptanoic acid (PFHpA), perfluorohexanoic acid (PFHxA), and perfluorohexanesulphonic acid (PFHxS), and increasing trends for perfluoropentanoic (PFPeA), perfluorobutanoic (PFBA), and perfluorobutanesulphonic acid (PFBS) were observed. The total PFAAs removal ranged from −138.6 to 73.5%. Correlations between the composition of the leachates and PFAAs removal percentages were determined. Overall, the results show the potential of electrochemical oxidation to oxidize PFAAs present in high strength water such as landfill leachates.

一种新型掺硼金刚石 (BDD) 流通池用于评估垃圾渗滤液中全氟烷基酸 (PFAA) 的电化学氧化。六种不同的浸出液，各 PFAA 的浓度范围为 10 ²  − 10 ⁴ng/L 进行处理。对流通池的性能进行了评估，并与氧化两种代表性 PFAA 的合成溶液进行了比较：全氟辛酸 (PFOA) 和全氟辛烷磺酸 (PFOS)。随后，研究了电流密度和渗滤液成分变化对实际垃圾渗滤液中 PFAA 电化学氧化的影响。对所有测试的渗滤液进行 2 小时处理后，全氟辛烷磺酸和全氟辛酸达到了非检测水平和 >90% 的降解。观察到全氟庚酸 (PFHpA)、全氟己酸 (PFHxA) 和全氟己烷磺酸 (PFHxS) 呈下降趋势，全氟戊酸 (PFP​​eA)、全氟丁酸 (PFBA) 和全氟丁磺酸 (PFBS) 呈上升趋势。PFAAs 的总去除率从 -138.6% 到 73.5% 不等。确定了渗滤液的组成与 PFAA 去除百分比之间的相关性。总体而言，结果表明电化学氧化有可能氧化存在于垃圾渗滤液等高浓度水中的 PFAA。