Photolysis and advanced oxidation treatment of estrogenic chemicals in tap water and treated sewage
DOI:
https://doi.org/10.15626/Eco-Tech.2007.089Keywords:
photolysis, estrogens, Electrical Energy per Order, AOP.Abstract
The removal efficiency by photolysis and advanced oxidation (AOP) of some estrogenic
compounds was investigated in tap water and biologically treated sewage. The compounds
investigated included parabens, industrial phenols, sunscreen chemicals and steroid estrogens.
Treatment experiments were performed using a UV lamp optimized for photochemical
treatment in a flow through set-up. The effect of different concentrations of H2O2 and
difference between tap water and treated sewage was investigated for all compounds.
The treatment effectiveness is evaluated based on the Electrical Energy per Order (EEO) (unit
kWh/111e3
), which is defined as the electrical energy consumed per unit volume of water treated
required for 90 % removal of the investigated compound.
It was found that the removal efficiency was better in tap water than in wastewater which is
due to the shadow effect from the inorganic and organic substance in the wastewater. Further,
it was found that the removal of all the compounds was dependent of the UV dose for both
treatment methods. The energy required for 90% removal of the compounds was between 28
kWh/111e3 ± 2.9 (butylparaben) and 1.2 kWh/ 111e3 (estrone) for the UY treatment. The AOP
results in a more unifom1 value of EEO, which is between 8. 7 kWh/m3 (bisphenol A and
benzophenone-7) and 1.8 kWh/m3 ( I 7a-ethynyl estradiol).
The removal at different concentration of H2O2 was investigated and it was found that
removal effectiveness increased with concentration until 60 mg/L, but decreased at I 00 mg/L,
which may be caused by H2O2 scavenging the HO'-radicals.
Metrics
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Copyright (c) 2007 Kamilla Hansen, Henrik R. Andersen, Tobias Hey, Anna Ledin
This work is licensed under a Creative Commons Attribution 4.0 International License.
