Online monitoring of <i>N</i>-nitrosodimethylamine for the removal assurance of 1,4-dioxane and other trace organic compounds by reverse osmosis

Fujioka, Takahiro; Kodamatani, Hitoshi; Takeuchi, Haruka; Tanaka, Hiroaki; Nghiem, Long D.

doi:10.1039/c8ew00271a

Cited by 14 publications

(14 citation statements)

References 40 publications

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“…An equilibrium time of 12 h was allowed before feed and permeate samples were collected for further analysis using an ultraperformance liquid chromatograph with double mass spectra (UPLC-MS/MS, Waters ACQUITY) . According to the literature, the equilibrium time ensures stable rejection performance (e.g., by eliminating the potential effect of TrOC sorption by the membrane). − The rejection of each TrOC was determined based on the measured feed ( C f ) and permeate ( C p ) concentrations (eq ) using three different membrane samples.…”

Section: Materials and Methodsmentioning

confidence: 99%

Mechanistic Insights into the Role of Polydopamine Interlayer toward Improved Separation Performance of Polyamide Nanofiltration Membranes

Yang

Wang

Guo

et al. 2020

Environ. Sci. Technol.

165

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Interlayered thin-film nanocomposite membranes (TFNi) are an emerging type of membranes with great potential to overcome the permeability–selectivity upper bound of conventional thin-film composite (TFC) nanofiltration and reverse osmosis membranes. However, the exact roles of the interlayer and the corresponding mechanisms leading to enhanced separation performance of TFNi membranes remain poorly understood. This study reports a polydopamine (PDA)-intercalated TFNi nanofiltration membrane (PA-PSF2, PDA coating time of 2 h) that possessed nearly an order of magnitude higher water permeance (14.8 ± 0.4 Lm–2 h–1 bar–1) than the control TFC membrane (PA-PFS0, 2.4 ± 0.5 Lm–2 h–1 bar–1). The TFNi membrane further showed enhanced rejection toward a wide range of inorganic salts and small organic molecules (including antibiotics and endocrine disruptors). Detailed mechanistic investigation reveals that the membrane separation performance was enhanced due to both the direct “gutter” effect of the PDA interlayer and its indirect effects resulting from enhanced polyamide formation on the PDA-coated substrate, with the “gutter” effect playing a more dominant role. This study provides a mechanistic and comprehensive framework for the future development of TFNi membranes.

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Section: Materials and Methodsmentioning

confidence: 99%

Mechanistic Insights into the Role of Polydopamine Interlayer toward Improved Separation Performance of Polyamide Nanofiltration Membranes

Yang

Wang

Guo

et al. 2020

Environ. Sci. Technol.

165

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“…197 No interference is observed in the direct injection of reverse osmosis permeate, which has allowed this method to be used for online near real-time monitoring of NDMA in wastewater treated by reverse osmosis at pilot scale. 198 The method has been validated for the detection of four nitrosamines in several recycled water matrices 199 and performs comparably to SPE-GC−MS/MS methods. 197 However, although the sensitivity is impressive when detecting NDMA, NMEA, N-nitrosomorpholine (NMOR), and N-nitrosopyrrolidine (NPYR), the method's performance detecting NDEA and NPIP is disappointing (LODs > 15 ng/L).…”

Section: ■ Detection and Sensing Of N-nitrosaminesmentioning

confidence: 99%

“…Interference from hypochlorite, commonly found in reclaimed wastewater, could be eliminated by brief pretreatment of the sample with ascorbic acid, and interference from residuals in ultrafiltration-treated wastewater could be controlled by reducing the injection volume to 20 μL while still achieving a method detection limit of 2 ng/L for NDMA . No interference is observed in the direct injection of reverse osmosis permeate, which has allowed this method to be used for online near real-time monitoring of NDMA in wastewater treated by reverse osmosis at pilot scale . The method has been validated for the detection of four nitrosamines in several recycled water matrices and performs comparably to SPE-GC–MS/MS methods .…”

Section: Detection and Sensing Of N-nitrosaminesmentioning

confidence: 99%

An Organic Chemist’s Guide to N-Nitrosamines: Their Structure, Reactivity, and Role as Contaminants

2021

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N-Nitrosamines are a class of compounds notorious both for the potent carcinogenicity of many of its members and for their widespread occurrence throughout the human environment, from air and water to our diets and drugs. Considerable effort has been dedicated to understanding Nnitrosamines as contaminants, and methods for their prevention, remediation, and detection are ongoing challenges. Understanding the chemistry of N-nitrosamines will be key to addressing these challenges. To facilitate such understanding, we focus in this Perspective on the structure, reactivity, and synthetic applications of N-nitrosamines with an emphasis on alkyl N-nitrosamines. The role of Nnitrosamines as water contaminants and the methods for their detection are also discussed.N-Nitrosamines (or simply "nitrosamines") are a class of compounds sharing the general structure 1 (Chart 1), where

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“…N ‐Nitrosodimethylamine (NDMA) has been identified as a probable human carcinogen through the methylation of DNA (Schäfer et al, 2010). NDMA can form as a disinfection byproduct and is often present in water above the detection limit but below 10 ng/L (Fujioka, Kodamatani, Takeuchi, Tanaka, & Nghiem, 2018). However, the highest concentrations of NDMA are produced during chloramination and ozonation (up to 280 ng/L) (Kosaka, Asami, Konno, Oya, & Kunikane, 2009).…”

Section: Introductionmentioning

confidence: 99%

“…Steric hindrance and hydrophobic interactions between solutes and NF/RO membrane polymers strongly influence the rejection of uncharged organic solutes (Bhattacharjee, Sharma, & Bhattacharya, 1996; Breitner et al, 2019; Ghoufi, Dražević, & Szymczyk, 2017; Wang, Mo, Mahendra, & Hoek, 2014). Most studies report higher rejection of negatively charged organic solutes due to electrostatic repulsion between negatively charged membranes and organic solutes (Fujioka et al, 2018). Rejection of surrogate indicators, such as boron (Breitner, Howe, & Minakata, 2018) and NDMA by RO membranes, was successfully used to predict the rejection of trace organic solutes.…”

Section: Introductionmentioning

confidence: 99%

How permeable could a reverse osmosis membrane be if it was specifically developed for uncharged organic solute rejection?

Wang

McVerry

et al. 2020

AWWA Water Science

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Here, we present both experimental data and modeling results of the removal of four different polar organic solutes by six different commercial nanofiltration (NF) and reverse osmosis (RO) membranes in a natural groundwater matrix. These results are significant for two reasons. First, three of the polar organic solutes are contaminants commonly found in both drinking water aquifers and municipal wastewaters and, hence, are particularly relevant to the protection of public health in drinking water production and potable reuse applications. Second, our membrane transport model can be used (1) to understand the fundamental mechanism governing uncharged, polar organic solute rejection and (2) to make forward predictions about how one might alter NF/RO membrane chemistry and structure to achieve a desired level of rejection. Perhaps a disappointing conclusion is that, for uncharged, polar organic solutes, the only obvious means of improving rejection is to reduce pore size, increase barrier layer thickness, and/or decrease barrier layer porosity, all of which reduce water permeability and energy efficiency. However disappointing this conclusion may be, we believe the fundamental insights that can be derived from this work are significant and important for the drinking water and water reuse scientific communities.

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Online monitoring of N-nitrosodimethylamine for the removal assurance of 1,4-dioxane and other trace organic compounds by reverse osmosis

Abstract: Online monitoring of N-nitrosodimethylamine (NDMA) during reverse osmosis (RO) treatment was effective in ensuring the removal of trace organic chemicals, particularly 1,4-dioxane.

Cited by 14 publications

References 40 publications

Mechanistic Insights into the Role of Polydopamine Interlayer toward Improved Separation Performance of Polyamide Nanofiltration Membranes

Mechanistic Insights into the Role of Polydopamine Interlayer toward Improved Separation Performance of Polyamide Nanofiltration Membranes

An Organic Chemist’s Guide to N-Nitrosamines: Their Structure, Reactivity, and Role as Contaminants

How permeable could a reverse osmosis membrane be if it was specifically developed for uncharged organic solute rejection?

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