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Decentralized greywater treatment is gaining increasing recognition as an alternative for natural water supplies. Laundry wastewater in relatively large amounts of greywater is considered as a valuable resource with high reuse potential. However, organic pollutants with low molecular weights (e.g., anionic surfactants) that originate from laundry additives should be effectively removed. Because anionic surfactants are widely used to produce detergents, the retention of sodium dodecylbenzene sulphonate (SDBS; a typical anionic surfactant in laundry wastewater) was evaluated with a bench-scale ceramic ultrafiltration (UF) membrane filtration system. The results demonstrate that SDBS can be successfully retained with a ceramic UF membrane with a nominal pore size of 1 kDa (~4.0 nm) by carefully controlling several operating parameters. The dynamic phase changes of the surfactant that depend on its …