(651c) A Novel Reverse Osmosis Membrane with PAMAM/TMC for Effective Oily Saline Water Separation

Oily and saline wastewater
is a significant waste stream generated in association with oil and gas
production, the direct discharge of which will pollute the environment and impair
people's health. Conventional polymer membranes suffer from low flux and
serious fouling when used for treating oily and saline wastewater. Reported
herein is the fabrication of a novel reverse osmosis membrane (PAMAM/TMC RO
membrane) prepared with Ethylenediamine cored poly(amidoamine)(PAMAM) dendrimer and trimesoyl
chloride(TMC) by interfacial polymerization on the PSf
ultrafiltration membrane. A smooth and hydrophilic skin layer was constructed
on the substrate PSf membrane and endows the
composite membrane with an antifouling performance. In separation of the stable
oily and saline water emulsion with an oil droplet size about 300nm, the
rejection of oil droplet and NaCl was about 99% and 89.3% respectively, and the
water flux was about 18.39 L/(m²•h). After running for 24h, the flux
only decreased about 3%, the rejection rate of oil and salt maintain 98% and
88%, exhibiting an excellent ability to resist oil pollution. Further
investigation demonstrated its outstanding performance to resist chlorine, acid
and alkali environment. Finally, it is believed that such membrane has great potential
for practical applications.