Recovery of PVA Using Polyethersulfone (PES) Hollow Fiber Ultrafiltration Membranes: Part II: Effect of Carboxymethyl Cellulose (CMC) Concentration


Polyethersulfone (PES) hollow fiber ultrafiltration (UF) membrane with the molecularweight cut-off (MWCO) 20,000 was used for the recovery of polyvinyl alcohol (PVA) fromthe simulated wastewater. An attempt to study the effect of carboxymethyl cellulose assynthetic warp sizing agents on the PVA recovery was investigated in this case.Experimental results shown that PVA concentration in the retentate of PES hollow fibermembrane were lower with addition of carboxymethyl cellulose (CMC) in PVA solution.Besides, higher trans-membrane pressure from 1.0 to 2.1 bars, solution temperature 50-75℃,and feed velocity 0.16-0.32 m/s, improved the PVA recovery in two different PVA solutions.PES hollow fiber ultrafiltration process was efficient for PVA recovery from the simulatedwastewater using PVA solution with low carboxymethyl cellulose (CMC) concentration assynthetic warp sizing agents.