Production of Reactive Oxygen Species during Redox Manipulation and Its Potential Impacts on Activated Sludge Wastewater Treatment Processes

Environmental Science & Technology, Год журнала: 2024, Номер unknown

Опубликована: Дек. 17, 2024

Reactive oxygen species (ROS) are ubiquitous in redox-fluctuating environments, exerting profound impacts on biogeochemical cycles. However, whether ROS can be generated during redox manipulation activated sludge wastewater treatment processes (AS-WTPs) and the underlying remain largely unknown. This study demonstrates that production is AS-WTPs due to frequency capacity of depend operating modes. The anaerobic/oxic continuous-flow reactor showed persistent generation (0.8-2.1 μM instantaneous H

Язык: Английский

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Critical Roles of Low-Molecular-Weight Organic Acid in Enhancing Hydroxyl Radical Production by Ferrous Oxidation on γ-Al2O3 Mineral Surface

Water Research, Год журнала: 2024, Номер 261, С. 122052 - 122052

Опубликована: Июль 5, 2024

Язык: Английский

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Fast On-Site Speciation and High Spatial Resolution Imaging of Labile Arsenic in Freshwater and Sediment Using the DGT-SERS Sensor

Analytical Chemistry, Год журнала: 2024, Номер 96(44), С. 17486 - 17495

Опубликована: Окт. 9, 2024

Diffusive gradients in thin films (DGT) technique is renowned for situ passive sampling but not rapid on-site analysis, whereas surface-enhanced Raman spectroscopy (SERS) excels ultrasensitive detection limited by substrate contamination from complex matrices. Here, a hierarchical nanostructure of silver (Ag) mirror-supported large Ag nanoparticles (∼120 nm) was grown polyacrylamide hydrogel with restricted pore size (PAM/Ag mirror/AgNPs) to serve as both the DGT binding phase and SERS substrate. The exhibited maximum electric field enhancement factor 9.9 × 108 signal relative standard error 4.8%. Using DGT-SERS sensor, As(III) As(V) freshwater were simultaneously detected at limits 0.9 0.8 μg L–1, respectively, applicable across wide range environmental conditions. effectively mitigated interfacial reduction caused humic acid excluding it plasmonic hotspots through exclusion diffusive layer. analysis sample requires only 2 s using portable spectrometer without device disassembly. More importantly, captured first two-dimensional image one micron scale resolution, revealing their spatially supplementary distribution patterns sediment-water interface. This study paves way next-generation speciation imaging application environments.

Язык: Английский

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Freezing-Induced Redistribution of Fe(II) Species within Clay Minerals for Nonlinear Variations in Hydroxyl Radical Yield and Contaminant Degradation

Journal of Earth Science, Год журнала: 2025, Номер unknown

Опубликована: Март 3, 2025

Язык: Английский

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Mechanisms of reactive intermediates formation in saline-alkali agricultural waters

Water Research, Год журнала: 2025, Номер unknown, С. 123540 - 123540

Опубликована: Март 1, 2025

Язык: Английский

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Fate of microplastics in soil-water systems: View from free radicals driven by global climate change

Ecotoxicology and Environmental Safety, Год журнала: 2025, Номер 295, С. 118138 - 118138

Опубликована: Апрель 1, 2025

Microplastics are ubiquitously distributed and persistently present in soil-water systems, posing potential ecological health risks worldwide. Free radicals highly reactive particularly at soil-water-air interface. The dynamic changes of free sensitive to environmental conditions may greatly impact the fate microplastics. However, pathways, reaction kinetics, or transformation products microplastic degradation by systems remains unclear. Climate change alters physical chemical environment this can directly affect microplastics, indirectly influence it altering generation species radicals. Here, we summarized analyzed fluctuations (such as superoxide radicals, hydrogen peroxide, peroxyl hydroxyl radicals) on microplastics their derivants. We also discussed how driven climate By integrating aspects such change, radical chemistry, pollution, work delineates critical issues pollution exacerbated condition changes. In response existing challenges deficiencies current research, feasible countermeasures proposed. This offers valuable insights for future research predicting controlling ecotoxicity caused associated with global change.

Язык: Английский

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Superoxide radical production and influencing factors in leaf biofilms of different submerged macrophytes: Field sampling experiments in a rural pond

Journal of environmental chemical engineering, Год журнала: 2025, Номер unknown, С. 116573 - 116573

Опубликована: Апрель 1, 2025

Язык: Английский

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Hydroxyl radicals produced from oxidation of ferrous sulfides promote mobilization of mercuric sulfide in soil–water system

Water Research, Год журнала: 2025, Номер unknown, С. 123625 - 123625

Опубликована: Апрель 1, 2025

Язык: Английский

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Hotspot regions of reactive oxygen species production and their environmental impacts in periodically flooded soil environments: A review

Critical Reviews in Environmental Science and Technology, Год журнала: 2025, Номер unknown, С. 1 - 26

Опубликована: Апрель 26, 2025

Язык: Английский

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Carbon Isotope Fractionation of Dissolved Organic Matter Due to ^•OH-Based Oxidation

Environmental Science & Technology, Год журнала: 2025, Номер unknown

Опубликована: Май 2, 2025

•OH-based oxidation plays a crucial role in dissolved organic matter (DOM) transformation and carbon flux, whereas quantifying the contribution of this pathway remains challenging. Here we combined concentration with isotope analysis DOM its generated CO2 to quantify oxidation. Results showed that 13C enrichment factors (ε values) were -8.1‰ -8.9‰ for benzene ring aromatic compounds, -4.2‰ -28.9‰ lower-molecular-weight acids, -13.0‰ from sediment. The fractionation sediment reflects average ε value humic substances acids. These values more negative than those photochemical microbial processes, enabling identification mechanisms. Using an end-member mix model, found proportion mineralization total emission ranged 20.9% 39.8% 100 g/L by 5-20 mM H2O2 under pH-neutral condition within 2 h was only 2% air same conditions. We also inorganic degassing contributed greatly during This study presents new isotope-based tool quantitatively assess DOM.

Язык: Английский

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