Water, Год журнала: 2025, Номер 17(9), С. 1241 - 1241

Опубликована: Апрель 22, 2025

Nitrate is the most prevalent inorganic pollutant in aquatic environments, posing a significant threat to human health and ecological environment, especially lakes groundwater, which are located high agricultural activity intensity areas. In order reveal sources of nitrogen pollution this study transformation mechanism interaction zone between groundwater has become an important foundation for prevention control. The coupling effect biogeochemical processes nitrate iron been pointed out be widely present various water environments recent years. However, impact minerals on reduction lake–groundwater high-salinity environment still remains uncertain. Based sediment chemistry characteristics Chagan Lake–groundwater northeastern China (groundwater TDS: 420~530 mg/L, Na+: 180~200 Cl−: 15~20 mg/L lake 470~500 210~240 71.40~87.09 mg/L), simulated relative oxidizing open system conditions reducing closed investigate hematite siderite effects microbial behavior. results indicated that both promoted system, whereas only system. Microbial community analysis significantly functional bacterial proliferation restructured composition by serving as electron donors/acceptors. systems, addition preferentially enriched Geobacter (denitrification, +15% abundance) Burkholderiales (DNRA, +12% abundance), while fostered distinct iron-carbon coupled metabolic network through Sphingomonas enrichment (+48% secretes organic acids enhance dissolution. These shifts accelerated Fe(II)/Fe(III) cycling rates 37% achieved efficient removal via combined denitrification DNRA pathways. Notably, with amendment demonstrated highest efficiency (80.6%). This reveals play critical role regulating pathways within salinized interfaces, thereby influencing microbially mediated redox processes.

Язык: Английский