Abstract In this work, the effect of the operation parameters (crossflow, pressure and temperature) on the individual fouling mechanisms of a RO membrane used for the purification of tertiary-treated OMW is addressed. The knowledge beforehand of the possible fouling mechanisms and the adoption of adequate operating conditions accordingly is key for the control of fouling and the steady performance of the membrane plant. The build-up of a gel layer was found to be dominant from the middle to the final moments of the membrane filtration. However, in the initial filtration periods a different mechanism, the blocking of the surface defects of the membrane, and the contribution of concentration polarization (38.6%) on the boundary region of the membrane, occurred as well before the definite build-up of the cake or gel layer. By applying medium pressure (25–15 bar), the intermediate blocking mechanism was reduced, and the formation of a cake or gel layer over the membrane skin predominated, a less strong form of fouling, whereas the increment of the crossflow (2.5–5.0 m s −1 ) reduced the gel layer formation (K gl ) by 77.1%. Upon the adopted conditions, the stable operation of the membrane regarding the rejection efficiency (COD rejection 97.5–99.1%) and flux (~ 24–32 L h −1 m −2 ) allowed to obtain a final purified effluent compatible for irrigation.

中文翻译：

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反渗透膜净化预处理橄榄厂废水中的污垢模型，采用自适应横流阻塞机制

摘要 在这项工作中，操作参数（错流、压力和温度）对用于三级处理的 OMW 净化的 RO 膜的各个污染机制的影响得到了解决。事先了解可能的结垢机制并相应地采用适当的操作条件是控制结垢和膜设备稳定性能的关键。发现凝胶层的积聚在膜过滤的中间到最后时刻占主导地位。然而，在初始过滤阶段，一种不同的机制，膜表面缺陷的阻塞，以及膜边界区域的浓差极化（38.6%）的贡献，也发生在膜的明确积聚之前。蛋糕或凝胶层。通过施加中等压力（25-15 巴），中间阻塞机制被减少，并且在膜皮上形成的滤饼或凝胶层占主导地位，这是一种不太强烈的污垢形式，而横流的增加（2.5-5.0 ms -1 ) 使凝胶层形成 (K gl ) 减少了 77.1%。在采用的条件下，膜在截留率（COD 截留率 97.5-99.1%）和通量（~ 24-32 L h -1 m -2 ）方面的稳定运行允许获得与灌溉相容的最终净化出水。