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water treatment plantsediment filters for waterSeparation devices in NF Given that NF system exhibits properties between those of ultrafiltration (UF) and reverse osmosis (RO), both cost and dimension of bit play crucial role in NF rejection mechanism. It has described NF as a charged UF system whereas referred it as low-pressure RO system. Nonetheless, NF has advantages of lower operating pressure compared to RO, and also higher natural being rejected compared to UF. For the colloids and also large molecules, physical sieving would be the leading denial device whereas for the ions and also lower molecular weight materials, remedy diffusion device as well as charge impact of membrane layers play the significant duty in separation process. The NF rejection system is identified into following five actions:Moistened surface water connects with the system via hydrogen bonding and the molecules which develop the hydrogen bonding with the membrane layer could be transported. Special sorption/Capillary denial– membrane layer is heterogeneous and micro porous, and also electrostatic repulsion occurs because of different electrostatic constants of remedy and also membrane layer.