High concentrations of dissolved organic nitrogen and N-nitrosodimethylamine precursors in effluent from biological nutrient removal process with low dissolved oxygen conditions

Liao, Kewei; Ma, Sijia; Liu, Caifeng; Hu, Haidong; Wang, Jinfeng; Wu, Bing

doi:10.1016/j.watres.2022.118336

Cited by 22 publications

(17 citation statements)

References 53 publications

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“…There are confounding reports in the literature concerning correlations between NDMA FP and nitrogen-related parameters. Some researchers observed a positive correlation between DON and NDMA formation, − while others reported weak relationships between NDMA formation and nitrogen-related parameters. ,, In the present study, a positive correlation between NDMA UFC and DN concentration was observed, which suggests that the DN concentration is a potential surrogate for NDMA precursors released into the rivers sampled in this study. When high NDMA UFC concentrations were detected in July 2020, January 2021, and February 2021, high DN concentrations were also observed.…”

Section: Discussionmentioning

confidence: 99%

Spatiotemporal Variability in N-Nitrosodimethylamine Precursor Levels in a Watershed Impacted by Agricultural Activities and Municipal Wastewater Discharges and Effects of Lime Softening

Li,

Arnold,

Hozalski

2023

Environ. Sci. Technol.

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The Crow River, a tributary of the Mississippi River in Minnesota, U.S.A., that is impacted by agricultural activities and municipal wastewater discharges, was sampled approximately monthly at 12 locations over 18 months to investigate temporal and spatial variations in N-nitrosodimethylamine (NDMA) precursor levels. NDMA precursors were quantified primarily by measuring NDMA formed under the low chloramine dose uniform formation conditions protocol (NDMAUFC) and occasionally using the high dose formation potential protocol (NDMAFP). Raw water NDMAUFC concentrations (2.2 to 128 ng/L) exhibited substantial temporal variation but relatively little spatial variation. An increase in NDMAUFC was observed for 126 of 169 water samples after lime-softening treatment. A kinetic model indicates that under chloramine-limited UFC test conditions, the increase in NDMAUFC can be attributed to a decrease in competition between precursors and natural organic matter (NOM) for chloramines and reduced interactions of precursors with NOM. NDMAUFC concentrations correlated positively with dissolved nitrogen concentration (ρ = 0.44, p < 0.01) when excluding the spring snowmelt period and negatively correlated with dissolved organic carbon concentration (ρ = −0.47, p < 0.01). Overall, NDMA precursor levels were highly dynamic and strongly affected by lime-softening treatment.

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Section: Discussionmentioning

confidence: 99%

Spatiotemporal Variability in N-Nitrosodimethylamine Precursor Levels in a Watershed Impacted by Agricultural Activities and Municipal Wastewater Discharges and Effects of Lime Softening

Li,

Arnold,

Hozalski

2023

Environ. Sci. Technol.

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“…The corresponding sections in Text S4 show details of statistical analysis clearly in terms of the following: (1) DOS molecular accumulation and rank abundance curves were calculated following Kellerman et al, 23 and identification of produced, shared, and removed molecules follows our previous research. 26 (2) Calculations involving microbes followed Zhou et al, 27 including indicator species, microbial co-occurrence networks of OTUs, and network properties (i.e., degree, betweenness centrality, within-module connectivity, among-modules connectivity of each node); based on within-module and among-module connectivity, nodes in networks were categorized into peripheral nodes, connectors, module hubs, and network hubs. (3) Spearman correlations were evaluated between indicator species and DOS, and structural equation modeling (SEM) by partial leastsquares path modeling approach (PLS-PM) was conducted to quantify their links.…”

Section: Discussionmentioning

confidence: 99%

Microbial Transformation of Dissolved Organic Sulfur during the Oxic Process in 47 Full-Scale Municipal Wastewater Treatment Plants

Liu

Liao

Wang

et al. 2023

Environ. Sci. Technol.

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Dissolved organic sulfur (DOS) is a significant part of effluent organic matter of wastewater treatment plants (WWTPs) and poses a potential ecological risk for receiving waters. However, the oxic process is a critical unit of biological wastewater treatment for microorganisms performing organic matter removal, wherein DOS transformation and its mechanism are poorly understood. This study investigated the transformation of DOS during the oxic process in 47 full-scale municipal WWTPs across China from molecular and microbial aspects. Surprisingly, evident differences in DOS variations (ΔDOS) separated sampled WWTPs into two groups: 28 WWTPs with decreased DOS concentrations in effluents (ΔDOS < 0) and 19 WWTPs with increased DOS (ΔDOS > 0). These two groups also presented differences in DOS molecular characteristics: higher nitrogen/carbon (N/C) ratios (0.030) and more peptide-like DOS (8.2%) occurred in WWTPs with ΔDOS > 0, implying that peptide-like DOS generated from microbes contributed to increased DOS in effluents. Specific microbe–DOS correlations (Spearman correlation, p < 0.05) indicated that increased effluent DOS might be explained by peptide-like DOS preferentially being produced during copiotrophic bacterial growth and accumulating due to less active cofactor metabolisms. Considering the potential environmental issues accompanying DOS discharge from WWTPs with ΔDOS > 0, our study highlights the importance of focusing on the transformation and control of DOS in the oxic process.

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“…At high altitudes, DO is more significant than at low levels. The more organic contaminants contaminate the water, the more oxygen is consumed to break down these molecules, reducing the water's dissolved oxygen level [19]. Variations in dissolved oxygen spatial distribution are assumed to be directly connected to anthropogenic activities along the river.…”

Section: Discussionmentioning

confidence: 99%

Spatial and temporal distribution of dissolved oxygen in the Ciliwung River, DKI Jakarta Province

Aprilia,

Effendi,

Hariyadi

2023

IOP Conf. Ser.: Earth Environ. Sci.

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The Ciliwung River is one of the main streams that pass Jakarta. This river flows through the city’s center and passes many villages, highly inhabited homes, and slums, necessitating special attention to the Ciliwung River’s water quality. Because dissolved oxygen is essential for aquatic life, it is the most critical measure of freshwater quality. This study aimed to analyze the spatial and temporal distribution of dissolved oxygen in the Ciliwung River in DKI Jakarta Province. Water quality was monitored during the rainy (February and June 2021) and the dry seasons (August and September 2021). The study area comprised 18 observation sites along the Ciliwung River in DKI Jakarta. Spatially, in Central and North Jakarta, the dissolved oxygen content of the Ciliwung River is relatively low. Temporarily, the dissolved oxygen concentration was somewhat more significant during the rainy season, but statistical testing revealed no statistically significant difference between the rainy and dry seasons.

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High concentrations of dissolved organic nitrogen and N-nitrosodimethylamine precursors in effluent from biological nutrient removal process with low dissolved oxygen conditions

Cited by 22 publications

References 53 publications

Spatiotemporal Variability in N-Nitrosodimethylamine Precursor Levels in a Watershed Impacted by Agricultural Activities and Municipal Wastewater Discharges and Effects of Lime Softening

Spatiotemporal Variability in N-Nitrosodimethylamine Precursor Levels in a Watershed Impacted by Agricultural Activities and Municipal Wastewater Discharges and Effects of Lime Softening

Microbial Transformation of Dissolved Organic Sulfur during the Oxic Process in 47 Full-Scale Municipal Wastewater Treatment Plants

Spatial and temporal distribution of dissolved oxygen in the Ciliwung River, DKI Jakarta Province

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