In this study, the effect of ageing on the performance and fouling mechanisms in the ultrafiltration of landfill leachates using titania-zirconia (ZrO₂-TiO₂) tubular membrane was thoroughly studied. Results revealed that the maturation of the leachate has a positive effect on its ultrafiltration, with a twofold higher final permeability compared with the young one. This is the result of the higher organic load, particularly that corresponding to proteins and carbohydrates, of the young leachate.

Resistance-in-series analysis demonstrated that the loss of permeability was mainly due to reversible fouling, caused by cake filtration. Either irrecoverable or irreversible fouling were scarce and not conditioned by the stage of maturation of the leachate. Chemical oxygen demand (COD) rejection for the mature leachate varied with volume concentration ratio (VCR) following an approximately sigmoidal shape, from an initial value of 18.5% to a final one of 49.6%, with the faster increase at VCR ranging from 1.2 to 1.7, due to the permeation of fatty acids by the ultrafiltration (UF) membrane. On the other hand, COD rejection remained approximately constant at 48% during the ultrafiltration of the young leachate, which can be attributed to the presence of higher molecular weight compounds in its composition.

在这项研究中，彻底研究了老化对使用二氧化钛-氧化锆（ZrO ₂ -TiO ₂）管膜超滤垃圾渗滤液的性能和结垢机理的影响。结果表明，渗滤液的成熟对其超滤具有积极作用，其最终渗透率是年轻渗滤液的两倍。这是年轻的渗滤液较高的有机负荷（尤其是与蛋白质和碳水化合物相对应的有机负荷）的结果。

串联电阻分析表明，渗透性的损失主要是由于滤饼过滤引起的可逆结垢。不可修复的或不可逆的污垢是稀缺的，并且不受浸出液成熟阶段的限制。成熟渗滤液的化学需氧量（COD）排放随体积浓度比（VCR）呈近似S形变化，从初始值的18.5％到最终值的49.6％，VCR的增加更快，范围为1.2至1.7，由于脂肪酸被超滤（UF）膜渗透。另一方面，在年轻渗滤液的超滤过程中，COD截留率大致保持恒定在48％，这可以归因于其组成中存在较高分子量的化合物。