Abstract:
Membranes has been received a great deal of attention as an alternative that can be
used for the purification of dye complex wastewater streams. Asymmetric NF
membrane meets the necessary standards caused by the capability to retain ions as
well as relatively small organic molecules from an aqueous solution. Asymmetric NF
membrane was developed to evaluate the efficiency of asymmetric NF membrane for
dye removal application. Asymmetric NF membranes were developed by the dry/wet
phase inversion method from casting solutions containing 23% Polysulfone (PSf) as
polymer and N-methyl-2 pyrrolidone (NMP) as solvent using a semi automated
electrically controlled casting machine. Membrane had been fabricated at the three
different of shear rate (353.9 s-1, 232.6 s-1 ). Pure water flux was
measured before the membranes were characterized in term of salt rejection and
theoretical approach. The morphology of the membranes were observed by using
Scanning Electron Microscopy (SEM) for identifying of the membrane structure
Membrane performance have been measured by employing five aqueous solution of
Reactive Black 5 with concentration of 100 mg/I to 500 mg/I. Operating pressure in
the range 2 bars to 10 bars were applied. According to the experimental result of pure
water flux and applied Steric Hindrance Pore model, the highest shear rate gives the
best performance of membrane. In the investigation on effect of dyes concentration,
flux was decreased when increasing RBS concentration. Flux decline was happen
during the time caused by fouling. RB 5 rejection proportionally increased with the
RBS concentration. Donnan effect became a dominant in this separation process.
Application of dye removal exceeding 90% of dyes will promise advanced treatment
option for pollution control in dye complex wastewater streams.
