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A Nanofiltration Decision Tool for Potable Reuse: A New Rejection Model for Recalcitrant CECs

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ABSTRACT: 

Effluent samples from three water resource recovery facilities (WRRFs) were individually characterized for presence and concentration of 94 different chemicals of emerging concern (CECs), using analytical methods with reporting limits in the low-parts-per-trillion. Following CEC analysis, each sample was subjected to dead-end, pressurized membrane filtration with either a nanofiltration (NF) or reverse osmosis (RO) membrane. The majority of the measured CECs were rejected by both membranes by 1-log removal (90%) or greater. However, nine of the 94 CECs had average rejection rates by the NF membrane less than 90%. A multilevel, multivariable model was developed to predict the probable rejection coefficients of CECs with the studied NF membrane. The resulting Quantitative Molecular Properties Model (QMPM) predicted the NF rejection of CECs based on size, ionic charge, and hydrophobicity. The model parameters that successfully predicted NF rejection in bench testing were log (Kow/Kaw) and the polar surface area of the CEC molecule.
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Keywords: chemicals of emerging concern; nanofiltration; potable reuse; reverse osmosis

Document Type: Research Article

Publication date: 01 November 2017

This article was made available online on 12 May 2017 as a Fast Track article with title: "A nanofiltration decision tool for potable reuse: A new rejection model for recalcitrant CECs".

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  • Water Environment Research (WER) is published monthly, including an annual Literature Review. A subscription to WER includes access to the latest content back to 1992, as well as access to fast track articles. An individual subscription is valid for 12 months from month of purchase.

    Water Environment Research (WER) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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