Micropollutants as internal probe compounds to assess UV fluence and hydroxyl radical exposure in UV/H2O2 treatment
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Autor:innen
Wünsch, Robin
Mayer, Carina
Plattner, Julia
Wülser, Richard
Gebhardt, Jens
Hübner, Uwe
Canonica, Silvio
von Gunten, Urs
Autor:in (Körperschaft)
Publikationsdatum
18.02.2021
Typ der Arbeit
Studiengang
Typ
01A - Beitrag in wissenschaftlicher Zeitschrift
Herausgeber:innen
Herausgeber:in (Körperschaft)
Betreuer:in
Übergeordnetes Werk
Water Research
Themenheft
DOI der Originalpublikation
Link
Reihe / Serie
Reihennummer
Jahrgang / Band
195
Ausgabe / Nummer
Seiten / Dauer
Patentnummer
Verlag / Herausgebende Institution
Elsevier
Verlagsort / Veranstaltungsort
Auflage
Version
Programmiersprache
Abtretungsempfänger:in
Praxispartner:in/Auftraggeber:in
Zusammenfassung
Organic micropollutants (MPs) are increasingly detected in water resources, which can be a concern for
human health and the aquatic environment. Ultraviolet (UV) radiation based advanced oxidation pro-
cesses (AOP) such as low-pressure mercury vapor arc lamp UV/H2O2 can be applied to abate these MPs.
During UV/H2O2 treatment, MPs are abated primarily by photolysis and reactions with hydroxyl radicals
(•OH), which are produced in situ from H2O2 photolysis. Here, a model is presented that calculates the
applied UV fluence (Hcalc) and the •OH exposure (CT•OH,calc) from the abatement of two selected MPs,
which act as internal probe compounds. Quantification of the UV fluence and hydroxyl radical exposure
was generally accurate when a UV susceptible and a UV resistant probe compound were selected, and
both were abated at least by 50 %, e.g., iopamidol and 5-methyl-1H-benzotriazole. Based on these key
parameters a model was developed to predict the abatement of other MPs. The prediction of abatement
was verified in various waters (sand filtrates of rivers Rhine and Wiese, and a tertiary wastewater efflu-
ent) and at different scales (laboratory experiments, pilot plant). The accuracy to predict the abatement of
other MPs was typically within ±20 % of the respective measured abatement. The model was further as-
sessed for its ability to estimate unknown rate constants for direct photolysis (kUV,MP) and reactions with
•OH (k•OH,MP). In most cases, the estimated rate constants agreed well with published values, considering
the uncertainty of kinetic data determined in laboratory experiments. A sensitivity analysis revealed that
in typical water treatment applications, the precision of kinetic parameters (kUV,MP for UV susceptible and
k•OH,MP for UV resistant probe compounds) have the strongest impact on the model’s accuracy
Schlagwörter
OH-radical exposure, UV/H2O2 AOP in-situ probe compounds, Water treatment, Sensitivity analysis, Kinetic modeling
Fachgebiet (DDC)
Veranstaltung
Startdatum der Ausstellung
Enddatum der Ausstellung
Startdatum der Konferenz
Enddatum der Konferenz
Datum der letzten Prüfung
ISBN
ISSN
0043-1354
1879-2448
1879-2448
Sprache
Englisch
Während FHNW Zugehörigkeit erstellt
Ja
Publikationsstatus
Veröffentlicht
Begutachtung
Peer-Review der ganzen Publikation
Open Access-Status
Hybrid
Lizenz
Zitation
WÜNSCH, Robin, Carina MAYER, Julia PLATTNER, Fabienne EUGSTER, Richard WÜLSER, Jens GEBHARDT, Uwe HÜBNER, Silvio CANONICA, Urs VON GUNTEN und Thomas WINTGENS, 2021. Micropollutants as internal probe compounds to assess UV fluence and hydroxyl radical exposure in UV/H2O2 treatment. Water Research. 18 Februar 2021. Bd. 195. DOI 10.1016/j.watres.2021.116940. Verfügbar unter: https://doi.org/10.1016/j.watres.2021.116940