Quantification of seasonal photo-induced formation of reactive intermediates in a municipal sewage lagoon upon sunlight exposure.

  title={Quantification of seasonal photo-induced formation of reactive intermediates in a municipal sewage lagoon upon sunlight exposure.},
  author={Yufei Wang and Linhua Fan and Oliver A. H. Jones and Felicity A Roddick},
  journal={The Science of the total environment},
Photochemically produced reactive oxygen species in wastewater lagoons upon sunlight exposure are important in the attenuation of emerging contaminants (ECs). The production of reactive radicals in wastewater lagoons depends on both environmental factors and the composition of effluent organic matter (EfOM) in the wastewater. Knowing the steady state concentrations of these reactive species produced in a particular lagoon wastewater is critical to the prediction of the persistence and… 
2 Citations
Photodegradation of emerging contaminants in a sunlit wastewater lagoon, seasonal measurements, environmental impacts and modelling
The seasonal sunlight-induced photodegradation of seven emerging contaminants (ECs) in a municipal wastewater treatment lagoon was examined in a lab-scale study over a year. There were obvious
Effect of chlorination on the characteristics of effluent organic matter and the phototransformation of sulfamethoxazole in secondary wastewater.
Investigation of effects of chlorination on the characteristics of EfOM, and its impact on the phototransformation of sulfamethoxazaole (SMX) provides new insights into the photochemical properties of chlorinated Efom in the aquatic environments and its roles in the degradation of antibiotics and other trace-level pharmaceuticals.


Role of effluent organic matter in the photochemical degradation of compounds of wastewater origin.
Compound degradation rate constants normalized to the rate of light absorption by water correlated with E2/E3 ratios may hold promise to predict indirect compound photodegradation rates for various effluent mixing ratios.
Quantifying photo-production of triplet excited states and singlet oxygen from effluent organic matter.
Results indicate that 2,4,6-trimethylphenol samples nearly all of the triplets in EfOM that have sufficient energy to produce 1O2, which may not be the case for NOM.
Phototransformation of wastewater-derived trace organic contaminants in open-water unit process treatment wetlands.
Results suggest that during summer, open-water cells that receive a million gallons of water per day can achieve 90% removal of most compounds in an area of about 15 ha, and transformation rates were strongly affected by pH.
Dissolved organic matter processing and photoreactivity in a wastewater treatment constructed wetland.
The photochemical behavior of DOM of wastewater treated in constructed wetlands was characterized and the effluent was observed to transition from a microbially sourced protein-like DOM to a terrestrial DOM with higher aromaticity.
Triplet photochemistry of effluent and natural organic matter in whole water and isolates from effluent-receiving rivers.
It is suggested that effluent contributions of up to 25% (v/v) to river systems have a negligible influence on photochemical production of 3OM* and 1O2 apparently because of quenching of triplet DOM by EfOM.
Sunlight-induced transformation of sulfadiazine and sulfamethoxazole in surface waters and wastewater effluents.
Both sulfonamides were found to undergo direct and indirect phototransformation, with contributions of excited triplet states of DOM and of effluent organic matter (EfOM) and possibly of hydroxyl radical and other unidentified reactive species.
Singlet oxygen formation from wastewater organic matter.
Making use of easily measurable absorbance values, a model for the prediction of (1)O2 steady-state concentrations is proposed, which explores the correlations between the photosensitizing properties of WWOM and optical characteristics (e.g., absorbance, E2:E3 ratio).
Sources and sinks of hydroxyl radicals upon irradiation of natural water samples.
Substantial DOM photolability was observed upon irradiation of nitrate-rich groundwater, mainly due to the elevated *OH generation rate, and evidence was also obtained of the photoformation of potentially toxic and/or mutagenic nitroaromatic compounds upon irradation of natural lake water and groundwater samples, proportionally to the nitrate levels.
Photosensitized degradation of caffeine: role of fulvic acids and nitrate.
Study of the photolysis of caffeine in solutions of fulvic acid isolated from Suwannee River, GA and Old Woman Creek Natural Estuarine Research Reserve with different chemical amendments suggests that an oxygen dependent long-lived radical e.g., peroxyl radicals plays an important role in the degradation of caffeine at lower initial concentration.
Pesticide photolysis in prairie potholes: probing photosensitized processes.
  • Teng Zeng, W. Arnold
  • Environmental Science, Medicine
    Environmental science & technology
  • 2013
Results from this study underscore the role of DOM as photosensitizer in limiting the persistence of pesticides in prairie wetlands through photochemical reactions.