Comparison of treatment efficiency of submerged nanofiltration membrane bioreactors using celulose treacetate and polyamide membrane

This study evaluates the performance of nanofiltration membrane bioreactor (NF MBR) systems C I D using cellulose triacetate (CA) and polyamide (PA) membranes. The results indicated that both NF membranes could produce high quality permeate in the submerged NF MBR system. In addition, hollow W 0 fiber CA membranes exhibited the capability of higher permeate productivity than PA membranes. However to obtain high quality permeate for a long-term operation, CA membranes should be maintained using an C 4 appropriate method, such as chlorine disinfection, in order to control the membrane biodegradation. The results demonstrated that PA membranes were capable of producing higher quality permeate for a long period than CA membranes. In order to enhance the practicability of PA membranes in submerged NF MBR systems, it is required that the membranes should have the lowest possible intrinsic salt rejection.