Temperature control on wastewater and downstream nitrous oxide emissions in an urbanized river system

Chun, Yewon; Do-Hee, Kim; Hattori, Shohei; Toyoda, Sakae; Yoshida, Naohiro; Huh, Jinhee; Lim, Ju Hee; Park, Ji‐Hyung

doi:10.1016/j.watres.2020.116417

Cited by 22 publications

(2 citation statements)

References 42 publications

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“…were not clear but one of the potential reasons could be the influence by tidal cycles: high tide during the sampling time (salinity was 0.17 instead of 0) may have reversed the water flow and measurements in aquatic systems associated with WWTPs (not included in Dong et al, 2023) to assess the global impact of WWTPs on aquatic N2O concentrations or emissions (McElroy et al, 1978;Hemond and Duran, 1989;Toyoda et al, 2009;Beaulieu et al, 2010;Rosamond et al, 2012;Chun et al, 2020;Masuda et al, 2021;Masuda et al, 2018;Dylla, 2019). WWTP effluents or water downstream of the WWTPs contain some of the highest N2O concentrations and fluxes observed in the aquatic system (Table 1 and Supplementary Figure 6).…”

Section: Impact Of Wastewater Treatment Plants On N2o Concentrations ...mentioning

confidence: 99%

Variable contribution of wastewater treatment plant effluents to nitrous oxide emission

Tang,

Talbott,

Jones

et al. 2024

Preprint

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Abstract. Nitrous oxide (N2O), a potent greenhouse gas and ozone-destroying agent, is produced during nitrogen transformations in both natural and human-constructed environments. Wastewater treatment plants (WWTPs) produce and emit N2O into the atmosphere during the nitrogen removal process. However, the impact of WWTPs on N2O emissions in downstream aquatic systems remains poorly constrained. By measuring N2O concentrations at a monthly resolution over a year in the Potomac River Estuary, a tributary of Chesapeake Bay in the eastern United States, we found a strong seasonal variation in N2O concentrations and fluxes: N2O concentrations were larger in fall and winter but the flux was larger in summer and fall. Observations at multiple stations across the Potomac River Estuary revealed hotspots of N2O emissions downstream of WWTPs. N2O concentrations were higher at stations downstream of WWTPs compared to other stations (median: 21.2 nM vs 16.2 nM) despite the similar concentration of dissolved inorganic nitrogen, suggesting the direct discharge of N2O from WWTPs into the aquatic system or a higher N2O production yield in waters influenced by WWTPs. Since wastewater production has increased substantially with the growing population and is projected to continue to rise, accurately accounting for N2O emissions downstream of the WWTPs would better constrain the global N2O emissions. Efficient N2O removal, in addition to dissolved nitrogen removal, should be an essential part of water quality control in WWTPs.

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Section: Impact Of Wastewater Treatment Plants On N2o Concentrations ...mentioning

confidence: 99%

Variable contribution of wastewater treatment plant effluents to nitrous oxide emission

Tang,

Talbott,

Jones

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

“…Thus, point sources seemed not to be the cause for the elevated N 2 O concentrations. However, discharge of WWTPs can potentially be important sources of N 2 O (Beaulieu et al, 2010;Chun et al, 2020;Brown et al, 2022), and the effect of wastewater input on N 2 O concentrations and emissions may change with altered river discharge, water temperature, and riverine nitrogen loads in the future.…”

Section: Hamburg Port: N 2 O Production In Spring and Summermentioning

confidence: 99%

Seasonal variability of nitrous oxide concentrations and emissions in a temperate estuary

Schulz,

Sanders,

Voynova

et al. 2023

Biogeosciences

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Abstract. Nitrous oxide (N2O) is a greenhouse gas, with a global warming potential 298 times that of carbon dioxide. Estuaries can be sources of N2O, but their emission estimates have significant uncertainties due to limited data availability and high spatiotemporal variability. We investigated the spatial and seasonal variability of dissolved N2O and its emissions along the Elbe Estuary (Germany), a well-mixed temperate estuary with high nutrient loading from agriculture. During nine research cruises performed between 2017 and 2022, we measured dissolved N2O concentrations, as well as dissolved nutrient and oxygen concentrations along the estuary, and calculated N2O saturations, flux densities, and emissions. We found that the estuary was a year-round source of N2O, with the highest emissions in winter when dissolved inorganic nitrogen (DIN) loads and wind speeds are high. However, in spring and summer, N2O saturations and emissions did not decrease alongside lower riverine nitrogen loads, suggesting that estuarine in situ N2O production is an important source of N2O. We identified two hotspot areas of N2O production: the Port of Hamburg, a major port region, and the mesohaline estuary near the maximum turbidity zone (MTZ). N2O production was fueled by the decomposition of riverine organic matter in the Hamburg Port and by marine organic matter in the MTZ. A comparison with previous measurements in the Elbe Estuary revealed that N2O saturation did not decrease alongside the decrease in DIN concentrations after a significant improvement of water quality in the 1990s that allowed for phytoplankton growth to re-establish in the river and estuary. The overarching control of phytoplankton growth on organic matter and, subsequently, on N2O production highlights the fact that eutrophication and elevated agricultural nutrient input can increase N2O emissions in estuaries.

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The Bacterial Microbiome of the Coral Skeleton Algal Symbiont Ostreobium Shows Preferential Associations and Signatures of Phylosymbiosis

et al. 2023

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Ostreobium, the major algal symbiont of the coral skeleton, remains understudied despite extensive research on the coral holobiont. The enclosed nature of the coral skeleton might reduce the dispersal and exposure of residing bacteria to the outside environment, allowing stronger associations with the algae. Here, we describe the bacterial communities associated with cultured strains of 5 Ostreobium clades using 16S rRNA sequencing. We shed light on their likely physical associations by comparative analysis of three datasets generated to capture (1) all algae associated bacteria, (2) enriched tightly attached and potential intracellular bacteria, and (3) bacteria in spent media. Our data showed that while some bacteria may be loosely attached, some tend to be tightly attached or potentially intracellular. Although colonised with diverse bacteria, Ostreobium preferentially associated with 34 bacterial taxa revealing a core microbiome. These bacteria include known nitrogen cyclers, polysaccharide degraders, sulphate reducers, antimicrobial compound producers, methylotrophs, and vitamin B12 producers. By analysing co-occurrence networks of 16S rRNA datasets from Porites lutea and Paragoniastrea australensis skeleton samples, we show that the Ostreobium-bacterial associations present in the cultures are likely to also occur in their natural environment. Finally, our data show significant congruence between the Ostreobium phylogeny and the community composition of its tightly associated microbiome, largely due to the phylosymbiotic signal originating from the core bacterial taxa. This study offers insight into the Ostreobium microbiome and reveals preferential associations that warrant further testing from functional and evolutionary perspectives.

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Temperature control on wastewater and downstream nitrous oxide emissions in an urbanized river system

Cited by 22 publications

References 42 publications

Variable contribution of wastewater treatment plant effluents to nitrous oxide emission

Variable contribution of wastewater treatment plant effluents to nitrous oxide emission

Seasonal variability of nitrous oxide concentrations and emissions in a temperate estuary

The Bacterial Microbiome of the Coral Skeleton Algal Symbiont Ostreobium Shows Preferential Associations and Signatures of Phylosymbiosis

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