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Solvent Resistant Polyimide Nanofiltration Membranes for Water Purification and Wastewater Management
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| Author:
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, B.VENKATA SWAMY, N.KUNDANA, B.SIREESHA, J.RENUKA, KIRAN KUMAR GANTA, VENKATA RAMANA JEEDI
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| Abstract:
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Solvent resistant Polyimide (P-84) asymmetric nanofiltration (NF) membranes were synthesized by phase inversion technique using mixed solvent system to treat dairy industrial effluent. These indigenous membranes were characterized by fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetric analysis (TGA) and scanning electron microscopy (SEM) to elucidate intermolecular interactions, crystallinity, thermal stability, surface and cross-sectional morphologies of the membrane, respectively. The influence of various parameters such as flux and rejection of total dissolved solids (TDS), chemical oxygen demand (COD) and biochemical oxygen demand (BOD) were studied and compared with cellulose acetate (CA) NF membranes. SEM analysis revealed that the surface of the synthesized membranes contained pores of squire area with diameter ranging from 0.97 nm for P-84 and 0.65 nm for CA membrane. Flux values of 17 L m-2 h-1 for P-84 and 14.8 L m-2 h-1 for CA were observed at a constant feed pressure of 20 kg cm-2. TDS, COD and BOD rejections were found to be 50%, 81.11% and 44% for P-84 and while in case of CA membranes the values were on the higher side at 81.33%, 83.33% and 72%, respectively. Separation performance proved to be strongly influenced by the choice of solvent systems used in membrane casting. An economic evaluation of commercial NF system with P-84 membrane shows potential for economical treatment of the dairy effluent with long membrane life due to high solvent resistance along with adequate mechanical and thermal stability in the harsh effluent medium.
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| Keyword:
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Polyimide, Dairy industrial effluent, Nano filtration, Flux, Economic evaluation.
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| EOI:
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-
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| DOI:
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https://doi.org/10.31838/ijpr/2020.SP3.077
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| Download:
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