Evidence for Assimilatory Nitrate Reduction as a Previously Overlooked Pathway of Reactive Nitrogen Transformation in Estuarine Suspended Particulate Matter

Environmental Science & Technology, Journal Year: 2022, Volume and Issue: 56(20), P. 14852 - 14866

Published: Sept. 13, 2022

Suspended particulate matter (SPM) contributes to the loss of reactive nitrogen (Nr) in estuarine ecosystems. Although denitrification and anaerobic ammonium oxidation SPM compensate for current imbalance global (N) inputs sinks, it is largely unclear whether other pathways Nr transformation exist SPM. Here, we combined stable isotope measurements with metagenomics metatranscriptomics verify occurrence dissimilatory nitrate reduction (DNRA) Pearl River Estuary (PRE). Surprisingly, conventional functional genes DNRA (nirBD) were abundant highly expressed SPM, which was inconsistent a low potential rate. Through taxonomic comparative genomic analyses, demonstrated that nitrite reductase (NirBD) conjunction assimilatory (NasA) performed (ANR) diverse alpha- gamma-proteobacterial lineages identified as key active heterotrophic ANR bacteria. Moreover, predicted have relative higher than survey across PRE spanning 65 km. Collectively, this study characterizes previously overlooked pathway mediated by bacteria has important implications our understanding N cycling estuaries.

Language: Английский

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Effects of Coal Mining Activities on the Changes in Microbial Community and Geochemical Characteristics in Different Functional Zones of a Deep Underground Coal Mine

Water, Journal Year: 2024, Volume and Issue: 16(13), P. 1836 - 1836

Published: June 27, 2024

For deep underground coal mining ecosystems, research on microbial communities and geochemical characteristics of sediments in different functional zones is lacking, resulting the knowledge zone-level mine water pollution prevention control being narrow. In this study, we surveyed distinctions five typical a representative North China coalfield, Xinjulong mine. The data indicated that compounds showed distinguishing features each zone. community richness diversity were ranked as follows: surface > rock roadways sumps ≥ goafs. Canonical Correlation Analysis (CCA), Spearman correlation co-occurrence network analysis demonstrated sensitive closely related to hydrochemical processes. distribution was not only nutrient elements (i.e., C, S, P N), but also redox-sensitive substances Fe As). When it comes control, central are With increase goaf closure time, total nitrogen (TN), organic carbon (TOC) sulfur (TS) decreased, As, phosphorus (TP) gradually increased, characteristic pollutant SO42− concentration samples decreased. Additionally, sulfate-reducing bacteria (SRB) had relatively higher proportions goafs, suggesting goafs able purify themselves. practical engineering, situ injection technology used expel oxygen create an anaerobic environment can be implemented enhance SRB reducing sulfate Meanwhile, because discharge generally discharges leaves sediment underground, pollutants transferred by strengthening relevant reactions including heavy metal solidification stabilization function bacteria.

Language: Английский

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AQDS-mediated dissimilatory reduction of iron (hydr)oxides induces the formation of large grain vivianite: A new insight for phosphorus pollution control in sediment

Journal of Cleaner Production, Journal Year: 2023, Volume and Issue: 419, P. 138217 - 138217

Published: July 24, 2023

Language: Английский

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Nutrients in overlying water affect the environmental behavior of heavy metals in coastal sediments

Environmental Research, Journal Year: 2023, Volume and Issue: 238, P. 117135 - 117135

Published: Sept. 13, 2023

Language: Английский

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Arsenic distribution and partitioning in multiple media in a typical catchment in the Qinghai-Tibetan plateau: A comparison between freshwater and saltwater lakes

Environmental Research, Journal Year: 2024, Volume and Issue: 246, P. 118132 - 118132

Published: Jan. 11, 2024

Language: Английский

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Distribution and speciation of arsenic in seasonally stratified reservoirs: Implications for biotransformation mechanisms governing interannual variability

The Science of The Total Environment, Journal Year: 2021, Volume and Issue: 806, P. 150925 - 150925

Published: Oct. 14, 2021

Language: Английский

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Understanding the Heavy Metal Pollution Pattern in Sediments of a Typical Small- and Medium-Sized Reservoir in China

International Journal of Environmental Research and Public Health, Journal Year: 2022, Volume and Issue: 20(1), P. 708 - 708

Published: Dec. 30, 2022

Heavy metal pollution in sediments is a common environmental issue small- and medium-sized reservoirs not only China but also worldwide; however, few interpretations of the pattern exist. Based on analyses accumulation characteristics, ecological risks, source apportionments eight heavy metals (As, Cd, Cr, Cu, Hg, Pb, Ni, Zn) sediments, we derived paradigm to describe typical Tongjiqiao Reservoir. The results showed high levels As pollutants surface upper sediment layers pre-dam area. Additionally, As, Pb peaked middle inflow area, indicating risk these areas. positive matrix factorization implied that industrial, agricultural, transportation activities were main sources metals. exhibited three distinct stages: low contamination, rapid pollution, control. This explains process will provide scientific guidance for realizing green sustainable operation development reservoir.

Language: Английский

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Carbon‑sulfur coupling in a seasonally hypoxic, high-sulfate reservoir in SW China: Evidence from stable C S isotopes and sulfate-reducing bacteria

The Science of The Total Environment, Journal Year: 2022, Volume and Issue: 828, P. 154537 - 154537

Published: March 12, 2022

Language: Английский

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Potential of bioaugmentation of heavy metal contaminated soils in the Zambian Copperbelt using autochthonous filamentous fungi

Frontiers in Microbiology, Journal Year: 2022, Volume and Issue: 13

Published: Dec. 1, 2022

There is great potential to remediate heavy metal contaminated environments through bioaugmentation with filamentous fungi. However, these fungi have been poorly investigated in most developing countries, such as Zambia. Therefore, the present study aimed at isolating indigenous from soil and explore their for use bioaugmentation. The conventional streak plate method was used isolate metal-contaminated soil. Filamentous fungal isolates were identified using morphological molecular techniques. radial growth diameter technique evaluate tolerance of abundant highly tolerant fungi, Aspergillus transmontanensis, Cladosporium cladosporioides, Geotrichum candidum species, bioremediate samples uncontaminated sample being employed a control. A maximum index (TI) between 0.7 11.0 observed A. G. while C. cladosporioides displayed TI 0.2 1.2 presence 1,000 ppm Cu, Co, Fe, Mn, Zn. interspecific interaction analyzed determine compatibility among isolates. Our results showed mutual intermingling three evaluated which confirms common influence biomineralization metals soils. Maximum bio-removal capacities after 90 days 72% 99.8% 60.6% 82.2% 100% both Pb This has demonstrated resistant autochthonous contamination problem.

Language: Английский

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Stormwater Suspended Solids and Pollutant Concentrations in an Urban Stream

Water Air & Soil Pollution, Journal Year: 2023, Volume and Issue: 234(9)

Published: Sept. 1, 2023

Abstract The chemical and ecological quality of small rivers or streams is not normally classified, but any urban stormwater discharges will result in their impairment. To assist understanding the resulting applied environmental stress to benthic communities, empirical relationships between in-stream suspended solids metal pollutants, initially identified by principal component analysis, are explored using data from a urbanised upland catchment. When amalgamated individual storms, correlation for each pollutant with obtained, starting very strongly, decreasing order Fe > Al Mn Pb Cr Zn Cu Ni. Comparison pollutant/solids correlations storms is, some metals, excellent, differing intercepts and/or gradients can be obtained an storms. practice assessing based on event mean concentrations longer-term averages across several storm events may conceal strong exemplifying impact variable catchment characteristics conditions; Cd Be poorly correlated likely affected changes background pollution levels. analysis covariance also highlights significant difference certain specific which calls into question validity combined storm-event datasets. here enable determination loads heavy metals useful developing water assessments.

Language: Английский

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