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For the colloids and huge molecules, physical sieving would be the leading denial mechanism whereas for the ions as well as lower molecular weight materials, solution diffusion system as well as fee impact of membrane layers play the significant role in separation process. The NF being rejected system is classified into following 5 steps:Wetted surface area water associates with the system through hydrogen bonding and the molecules which create the hydrogen bonding with the membrane layer could be delivered. Preferential sorption/Capillary rejection– membrane layer is heterogeneous as well as micro permeable, and also electrostatic repulsion happens because of various electrostatic constants of solution and membrane. Service diffusion– NF system is uniform as well as non-porous, and solute as well as solvent liquify in the energetic layer of the membrane and the transportation of the solvent takes place because of the diffusion with the layer. Billed capillary– electrical dual layer in the pores figures out denial. Ions of exact same cost as that of membrane layer are brought in as well as counter-ions are declined as a result of the streaming capacity.