1. Introduction
Ultraviolet (UV) light exposure is one of the disinfection options in water treatment plants, wastewater treatment plants and wastewater reclamation facilities for reuse [1], [2] and [3]. In practice, UV disinfection may serve alone or in combination with other unit processes. Combination of UV with membrane filtration is good because, when UV precedes membrane, the UV can suppress biofouling in the subsequent membrane system [4], [5], [6], [7] and [8]. Meanwhile, if UV follows membrane filtration, the UV can serve as one of the multi-barriers to make the whole system more robust, such as that adopted in the NEWater project in Singapore [9].