Water reclamation and reuse are economically and environmentally important issues for industries. Costly and ineffective treatments such as coagulation, flocculation, and/or biological treatment are the most widely used technologies for these processes. The aim of this paper is to study membrane separation to treat biodiesel wastewater as an alternative. To achieve this goal, two commercial nanofiltration membranes were used to treat medium-high strength wastewater. An Inopor Nano tubular ceramic membrane was used in a cross-flow module and a NF99HF Alfa Laval polymeric flat sheet membrane was used in a dead-end filtration cell. Wastewaters were prepared and treated with these membranes achieving maximum fluxes of permeate of 53.1 L h^-1 m^-2 for the ceramic membrane and 12.2 L h^-1 m^-2 for the polymeric membrane at 20 bar and 30 °C. The results shows a chemical oxygen demand retention between 80-85% were obtained for both membranes, while the retention of ionic species due to changes in electrical conductivity was 76-89%. Transmembrane pressure, organic load, hydraulic permeability, cross-flow velocity, wastewater characterization and fouling resistance-in-series analysis were also made and analyzed in detail in order to explore the actual use of nanofiltration.

水的回收和再利用对于工业而言在经济和环境方面都是重要的问题。诸如凝结，絮凝和/或生物处理之类的昂贵且无效的处理是用于这些过程的最广泛使用的技术。本文的目的是研究膜分离以替代生物柴油废水。为了实现这一目标，使用了两种工业纳滤膜来处理中高强度废水。Inopor纳米管状陶瓷膜用于错流模块，而NF99HF阿法拉伐聚合物平板膜用于无端过滤池。制备废水并用这些膜处理，陶瓷膜的最大透过水量为53.1 L h ^-1  m ^-2，而陶瓷膜的最大透过量为12.2 L h聚合物膜在20 bar和30°C时为^-1  m ^-2。结果表明，两种膜均获得80-85％的化学需氧量，而由于电导率变化而产生的离子种类的保留率为76-89％。还进行了跨膜压力，有机负荷，水力渗透率，错流速度，废水表征和抗结垢性串联分析，以探索纳米过滤的实际应用。