Dissolved organic matter processing and photoreactivity in a wastewater treatment constructed wetland

The Science of the Total Environment
Arpit SardanaTarek N Aziz

Abstract

Constructed wetlands have the capacity to degrade a host of contaminants of emerging concern through photodegradation via sunlight produced reactive oxygen species. Dissolved organic matter (DOM) is a critical intermediary in photodegradation as it influences the production of reactive oxygen species. In this study, the photochemical behavior of DOM of wastewater treated in constructed wetlands was characterized. Whole water samples and fractionated DOM were characterized using SUVA254, spectral slope ratios, excitation emission matrix fluorescence spectroscopy (EEMs), and proton nuclear magnetic resonance (1H NMR). Photoreactivity was assessed by measuring formation rates and steady state concentrations of hydroxyl radical (•OH), singlet oxygen (1O2), and the triplet excited states of DOM (3DOM⁎). The effluent was observed to transition from a microbially sourced protein-like DOM to a terrestrial DOM with higher aromaticity. Size exclusion chromatography revealed an 18% increase in larger molecular weight fractions of vegetated wetland effluent DOM. Additionally, wetland effluent DOM was observed to have a 32% increase in the aromatic region of 1H NMR spectra as compared to untreated wastewater. 1H NMR analysis also indicated ...Continue Reading

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Citations

Jul 25, 2020·Water Environment Research : a Research Publication of the Water Environment Federation·Bo LiuChein-Chi Chang
Sep 9, 2020·The Science of the Total Environment·Yongkun K WangXiaochang C Wang
Jun 15, 2021·Journal of Environmental Management·Hengfeng ZhangMawuli Dzakpasu
Jul 8, 2021·Environmental Science. Processes & Impacts·Sarah B PartanenKristopher McNeill

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