Sewage Vertical Infiltration Introduced Polygenic Multipollutants into Groundwater DOI Open Access
Yihan Dong, Yifan Han, Xu Han

et al.

Water, Journal Year: 2024, Volume and Issue: 16(16), P. 2305 - 2305

Published: Aug. 16, 2024

With the increasing environmental impacts of human activities, problem polygenic multipollutants in groundwater has attracted attention researchers. Identifying hydrobiogeochemical characteristics surface sewage that replenishes is crucial to addressing this problem. The input into leads not only mechanical superposition pollutants but also formation secondary pollutant types. evolution influenced by aquifer characteristics, carbon sources, microbial abundance, etc. Therefore, study took a leakage point Northwest China as research object, carried out controlled laboratory experiment on impact discharge groundwater, and, combined with long-term field monitoring results, determined main processes and their pollutants. results showed redox environment gradient change pH were identified most critical controlling factors. In oxidative during early stage vertical infiltration, carries substantial amount NH4+, which oxidized form NO3−. As O2 consumed, reduction intensifies, NO3−, Mn (IV), Fe(III) minerals are successively reduced. Compared natural conditions rainwater reaction rates intensities various reactions significantly increase infiltration. However, there notable difference between NO3− reduction, large CO2 rapidly generated. Excessive dissolves produce H+, promoting acidic dissolution (II) generation Mn2+. Sewage provides higher load, enhancing stimulating activity dissimilatory nitrate ammonium, exhibits contribution reduction. This portion converted from NH4+ being reduced back retained reducing denitrification’s capacity remove important implications for pollution management remediation, particularly monitored attenuation.

Language: Английский

Surface water infiltration and sediment degradation shaping dissolved organic matter in groundwater related to chronic kidney disease of unknown etiology DOI

Xianjiang Zeng,

Wei He,

Qiutong Shi

et al.

Journal of Hydrology, Journal Year: 2025, Volume and Issue: 652, P. 132699 - 132699

Published: Jan. 12, 2025

Language: Английский

Citations

0
Electrochemistry and Molecular Compositions Reflect Electron Shuttling of Dissolved Organic Matter in High Arsenic Groundwater DOI
Xiaojun Feng, Yao Li,

Jianyi Jin

et al.

Environmental Science & Technology, Journal Year: 2025, Volume and Issue: unknown

Published: April 21, 2025

Little is known about the electron shuttle ability of dissolved organic matter (DOM) and its effects on arsenic (As) mobilization, which makes underlying mechanism groundwater As enrichment elusive. In this study, both electrochemical properties molecular compositions DOM in high were quantified Hetao Basin, China. We found that, along flow path, average electron-transferring capacity (ETC) DOM, including capacities electron-accepting electron-donating, continuously increased from 2.85 to 3.59 mmole-/gC with concentrations. The increasing ETC reflected an increase DOM. Furthermore, was mainly attributed recalcitrant compounds especially CHOS CHONS formulas highly unsaturated structures oxygen (HUSHO) CHO CHON aromatic (AS). significantly positive correlation between concentration indicated that promoted through shuttling for inducing reductive dissolution As-containing Fe(III) oxide minerals, further supported by our culture experiments showing goethite more reduced [133 μM Fe(II)] presence a higher (3.35 mmole-/gC) as than [65.2 relatively lower (2.41 mmole-/gC). Our study highlights AS have ability, promoting groundwater.

Language: Английский

Citations

0
Sewage Vertical Infiltration Introduced Polygenic Multipollutants into Groundwater DOI Open Access
Yihan Dong, Yifan Han, Xu Han

et al.

Water, Journal Year: 2024, Volume and Issue: 16(16), P. 2305 - 2305

Published: Aug. 16, 2024

With the increasing environmental impacts of human activities, problem polygenic multipollutants in groundwater has attracted attention researchers. Identifying hydrobiogeochemical characteristics surface sewage that replenishes is crucial to addressing this problem. The input into leads not only mechanical superposition pollutants but also formation secondary pollutant types. evolution influenced by aquifer characteristics, carbon sources, microbial abundance, etc. Therefore, study took a leakage point Northwest China as research object, carried out controlled laboratory experiment on impact discharge groundwater, and, combined with long-term field monitoring results, determined main processes and their pollutants. results showed redox environment gradient change pH were identified most critical controlling factors. In oxidative during early stage vertical infiltration, carries substantial amount NH4+, which oxidized form NO3−. As O2 consumed, reduction intensifies, NO3−, Mn (IV), Fe(III) minerals are successively reduced. Compared natural conditions rainwater reaction rates intensities various reactions significantly increase infiltration. However, there notable difference between NO3− reduction, large CO2 rapidly generated. Excessive dissolves produce H+, promoting acidic dissolution (II) generation Mn2+. Sewage provides higher load, enhancing stimulating activity dissimilatory nitrate ammonium, exhibits contribution reduction. This portion converted from NH4+ being reduced back retained reducing denitrification’s capacity remove important implications for pollution management remediation, particularly monitored attenuation.

Language: Английский

Citations

0