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Membrane Water Treatment
  Volume 7, Number 3, May 2016 , pages 241-255

Arsenic removal from drinking water by direct contact membrane distillation
Ali Zoungrana, İsmail H. Zengin, Harun Elcik, Dilara Yeşilırmak, Doğan Karadağ and Mehmet Çakmakci

    The enantiomeric and racemic effects of tartaric acid (TA) on the properties of polysulfone (PSn) ultrafiltration membranes were studied in terms of morphology and hydrophilicity (HPCT) of membrane. Asymmetric membranes were prepared by direct blending of polyvinyl pyrrolidone (PVP) with D-TA and DL-TA in membrane casting solution. FTIR analysis was done for the confirmation of the reaction of PVP and TA in blended membranes and plain PSn membranes. Scanning electron microscope (SEM), field emission scanning electron microscope (FESEM) and atomic force microscopy (AFM) were used for analyzing the morphology and structure of the resulting membranes. The membranes were characterized in terms of pure water flux (PWF), hydraulic permeability and HPCT. PWF increased from 52 L/m2h to 79.9 L/m2h for plain and D-TA containing PSn membrane, respectively. Water contact angle also found to be decreased from 68° to 55°. In Additionally, permeation and rejection behavior of prepared membranes was studied by bovine serum albumin (BSA) solution. A considerable increase in BSA flux (from 19.1 L/m2h for plain membrane to 32.1 L/m2h for D-TA containing membrane) was observed. FESEM images affirm that the pore size of the membranes decreases and the membrane permeability increases from 0.16 to 0.32 by the addition of D-TA in the membrane. D-TA increases the HPCT whereas; DL-TA decreases the HPCT of PSn membrane. PVP (average molecular weight of 40000 Da) with D-TA (1 wt%) gave best performance among all the membranes for each parameter.
Key Words
    arsenic removal; contaminated water; hydrophobic membrane; membrane distillation
Environmental Engineering, Yildiz Technical University, Davutpasa Kampus 34220 Esenler Istanbul, Turkey.

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