Comparison of RO and NF in wastewater reclamation
Currently, water reuse and reclamation are considered as an essential technology available for alternative water resources with respect to non-potable as well as potable uses. Therefore, lots of studies have been developing various technologies for water reuse, reclamation, and desalination to producing the more reliable and higher quality reclaimed/reused water. In addition, there are several practical plants to reuse the secondary effluent of wastewater around the world. Among them, membrane filtration process is recognized as one of effective technologies for wastewater reuse/reclamation due to its great performance, especially for inorganic/organic micropollutants and wastewater effluent organic matter (EfOM) removal. Even though high quality water production of membrane technology, reused water from membrane filtration is still used in non-potable use such as agricultural, industrial and recreation water and in indirect potable use. Thus, reliability and safety of reclaimed/reused water should be guaranteed by establishing database of reused water quality and system optimization for a direct potable use. In this study, both RO and NF membranes were evaluated by pilot-scale system for wastewater reuse in direct potable use. The objectives of this study are 1) to evaluate the membrane performances including treated water quality and water production as well as membrane fouling, 2) to provide the database of reclaimed water quality for potable application, and 3) to optimize the membrane system in terms of membrane selection as well as system maintenance. Through this study, membrane filtration for wastewater reclamation can be evaluated as a novel process with respect to efficiency, safety, and economical aspect.