Nitrogen removal in freshwater sediments of riparian zone: N-loss pathways and environmental controls

Frontiers in Microbiology, Год журнала: 2023, Номер 14

Опубликована: Авг. 17, 2023

The riparian zone is an important location of nitrogen removal in the terrestrial and aquatic ecosystems. Many studies have focused on efficiency one or two processes zone, less attention has been paid to interaction different transformation impact situ environmental conditions. molecular biotechnology, microcosm culture experiments 15N stable isotope tracing techniques were used this research at Weinan section Wei River, reveal mechanism with multi-layer lithologic structure. results showed that rate was 4.14-35.19 μmol·N·kg-1·h-1. Denitrification, dissimilatory reduction ammonium (DNRA) anaerobic oxidation (anammox) jointly achieved natural attenuation process denitrification dominant (accounting for 59.6%). High dissolved organic nitrate ratio (DOC:NO3-) would promote denitrification, but when NO3- content than 0.06 mg/kg, DNRA occur preference denitrification. Furthermore, abundances functional genes (norB, nirS, nrfA) anammox bacterial 16S rRNA gene similar distribution patterns corresponding rates. Sedimentary NOX-, Fe(II), carbon (DOC) microbial abundance main factors affecting zone. Fe (II) promoted through dependent ferrous under mediation, DOC promotes enhancing effect. study can be management prevention control global pollution.

Язык: Английский

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Distribution and risk assessment of antibiotics under water level fluctuation in the riparian zone of the Hanjiang River

Ecotoxicology and Environmental Safety, Год журнала: 2023, Номер 256, С. 114833 - 114833

Опубликована: Март 28, 2023

The riparian zone (RZ) is an important region connecting surface water and groundwater, it has widely been acknowledged for its pollutant buffering capacity. However, the decontaminating effect of RZ on trace organic compounds such as antibiotics received little attention. This study explored distribution 21 4 sulfonamide metabolites in river groundwater lower reaches Hanjiang River. diffusion exchange contaminants between riverbanks under influence conservancy projects (Xinglong Dam Yangtze-Hanjiang Water Diversion Project) were investigated. Macrolide prevalent (62.5-100%) samples (42.9-80.4%). Ofloxacin chlortetracycline detected with highest concentrations (12.2 ng L-1) (9.3 respectively. Higher levels observed spring winter than other seasons. river-groundwater interaction a certain interception antibiotics, especially near riverbanks. Redox sensitive element Fe2+ showed significantly positive correlations some tetracycline macrolide (p < 0.05), thus migration mechanism condition redox change should be investigated further. Environmental risks posed by assessed algae, daphnids, fish groundwater. Only clarithromycin presented medium risk to algae (0.1 RQ 1), rest low (RQ 0.1). Nevertheless, range may further extended interactions water. Accurate understanding antibiotic transport critical developing management strategies aimed at reducing pollution load watershed.

Язык: Английский

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Sources and fate of nitrate in the unsaturated zone in an alluvial-lacustrine plain

Journal of Hazardous Materials, Год журнала: 2025, Номер 490, С. 137721 - 137721

Опубликована: Фев. 24, 2025

Язык: Английский

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Seasonal freeze-thaw significantly alters the distinct aquifers solute transport, microbial community assembly patterns, and molecular ecological networks in the hyporheic zone

Water Research, Год журнала: 2025, Номер unknown, С. 123555 - 123555

Опубликована: Март 1, 2025

Язык: Английский

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Fe(III) oxyhydroxides mediated electron transfer from thiols to O2 for hydroxyl radical production

Chemical Geology, Год журнала: 2024, Номер 648, С. 121962 - 121962

Опубликована: Янв. 26, 2024

Язык: Английский

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ROS production upon groundwater oxygenation: Implications of oxidative capacity during groundwater abstraction and discharging

Journal of Hydrology, Год журнала: 2023, Номер 620, С. 129551 - 129551

Опубликована: Апрель 22, 2023

Язык: Английский

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The effects of colloidal Fe and Mn on P distribution in groundwater system of Jianghan Plain, China

The Science of The Total Environment, Год журнала: 2022, Номер 854, С. 158739 - 158739

Опубликована: Сен. 13, 2022

Язык: Английский

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Mechanism of reactive co-transport of Fe2+ and antibiotics in hyporheic zone simulated by quartz sand column

Journal of Hydrology, Год журнала: 2023, Номер 621, С. 129641 - 129641

Опубликована: Май 15, 2023

Язык: Английский

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A sand tank experimental study of distribution, migration and transformation mechanism of iron and phosphorus species under redox fluctuation in a simulated riparian zone

Journal of Hydrology, Год журнала: 2023, Номер 625, С. 130032 - 130032

Опубликована: Авг. 24, 2023

Язык: Английский

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Reactive migration mechanism of Fe2+ and As3+ during groundwater discharge into river water: Insight from sand column experiments

Journal of Hydrology, Год журнала: 2023, Номер 625, С. 130033 - 130033

Опубликована: Авг. 30, 2023

Язык: Английский

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