Suresh K, Nambikkattu J, Kaleekkal NJ, Lawrence K D. Custom-designed 3D printed feed spacers and TFN membranes with MIL-101(Fe) for water recovery by forward osmosis.
Environ Technol 2023:1-31. [PMID:
37368861 DOI:
10.1080/09593330.2023.2231142]
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Abstract
ABSTRACTIn this work, a dual-pronged approach- (i) novel thin-film nanocomposite polyether sulfone (PES) membrane with MIL-101 (Fe) and (ii) 3D printed spacers were explored to enhance water recovery by forward osmosis. The concentration of PES, pore former, draw solution, and MIL-101(Fe) was optimized for maximum pure water flux (PWF) and minimum specific reverse solute flux (SRSF). The best membrane exhibited a PWF of 7.52 Lm-2h-1 and an SRSF of 0.33 ± 0.03 gL-1 using 1.5 M NaCl. The M22 membrane with the diamond-type spacer demonstrated a PWF of 2.53 Lm-2h-1 and SRF of 0.75 gL-1. The novel spacer design imparted significant turbulence to the feed flow and a lower foulant resistance of 1.3 m-1 as compared to the ladder type (1.5 m-1) or commercial spacer (1.7 m-1). This arrangement could recover 19% pure water within 12 h of operation (98% oil rejection) with a ∼ 94% flux recovery after water wash.
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