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. 2020 Feb 19;27(13):15488–15497. doi: 10.1007/s11356-020-08021-x

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© The Author(s) 2020

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Fig. 6 — a Performance tests for the TNFS membranes in terms of oil rejection and water flux with different oils and b oil concentrations in permeates, which are lower than US environmental discharge standards of 42 ppm