Die Umweltchemikerin Joanna Houska ist für Ihre Doktorarbeit von der Deutschen Wasserchemischen Gesellschaft ausgezeichnet worden. Houska hat an der Eawag und EPFL geforscht und sowohl theoretisch als auch mit Experimenten aufgezeigt, wie die oxidative Behandlung von Wasser mit Ozon oder Chlor effizienter eingesetzt werden kann, wenn genauer bekannt ist, welche organischen Stoffe im zu behandelnden Wasser gelöst sind.
«Die Arbeit ist ein Meilenstein für ein besseres Verständnis der Rolle von gelöstem organischem Material bei der oxidativen Wasseraufbereitung», sagt Joanna Houskas Betreuer, Urs von Gunten. Er ist Professor an der EPFL und leitet am Wasserforschungsinstitut Eawag die Gruppe für Trinkwasserchemie. Houska verfüge, so von Gunten, über «eine enorme Fähigkeit, komplexe wissenschaftliche Fragestellungen theoretisch und experimentell zu bearbeiten und Probleme mit grosser Unabhängigkeit erfolgreich zu lösen.» In ihren Experimenten, aber auch mit Modellieren habe die Forscherin spannende neue Daten produziert und interpretiert, die zur Verbesserung der oxidativen Wasseraufbereitung eingesetzt werden können.
Ineffizient und gefährlich ohne genaue Analyse
Wo liegt denn das Problem? Werden Chlor oder Ozon zur Desinfektion/Oxidation von Wasser eingesetzt, ist das Hauptziel, Krankheitskeime und Mikroverunreinigungen unschädlich zu machen. Aber der grösste Teil der Oxidationsmittel reagiert mit Wassermatrixbestandteilen wie dem gelösten organischen Material. Das verringert nicht nur die Effizienz der Verfahren, sondern kann im dümmsten Fall zur Bildung von toxischen Nebenprodukten führen. Also sollte man möglichst genau wissen, was im zu behandelnden Wasser gelöst ist, um die Oxidation effizient zu machen. Hier hat Forscherin Houska mit ihren Studien eingesetzt, denn bisher wurden dafür hauptsächlich Summenparameter verwendet, abgeleitet zum Beispiel aus der UV-Absorption. In ihrer Dissertation hat sie deshalb erst Methoden entwickelt, um die Konzentration von relevanten Verbindungen zu messen. Anschliessend hat sie diese charakterisiert und bewertet, ob und wie stark sie problematische Nebenprodukte bilden können. Und schliesslich hat sie über die Sauerstoffisotope im Wasserstoffperoxid aufgedeckt, wie die heiklen Vorläufersubstanzen voneinander unterschieden werden können. Interessant ist ausserdem, dass Houska ihre Forschung nicht nur auf die Desinfektion/Oxidation von Wasser, das als Trinkwasser genutzt wird, beschränkt hat. Vielmehr hat sie auch auf einer Kläranlage die Bildung von Ozonungs-Nebenprodukten und deren anschliessenden Abbau in der biologischen Nachbehandlung von gereinigtem Abwasser verfolgt.
Erstmals in die Schweiz
Der Promotionspreis auf dem Gebiet der Wasserchemie wird seit 1992 verliehen und ist mit 1500 Euro dotiert. 2024 geht er zum ersten Mal in die Schweiz. Was Joanna Houska mit dem Batzen machen wird, weiss sie schon: «Mein Fahrrad benötigt dringend ein Upgrade, deshalb wird das Preisgeld am ehesten darin investiert». Sie arbeitet inzwischen in der Umweltabteilung bei Roche im Bereich Abwasser und Gewässerschutz.
Titelbild: Joanna Houska bei der Preisübergabe mit Prof. Thomas Ternes an der Jahrestagung der Wasserchemischen Gesellschaft in Limburg (D) (Foto: Nina Hermes, BfG)
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title => protected'Oxidant-reactive carbonous moieties in dissolved organic matter: selective q uantification by oxidative titration using chlorine dioxide and ozone' (145 chars)
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categories => protected'dissolved organic matter; oxidative titration; chlorine dioxide; ozone; elec tron-donating capacity; molecular tagging; electron-rich moieties; phenols; oxidation byproducts' (172 chars)
description => protected'The application of oxidants for disinfection or micropollutant abatement dur ing drinking water and wastewater treatment is accompanied by oxidation of m atrix components such as dissolved organic matter (DOM). To improve predicti ons of the efficiency of oxidation processes and the formation of oxidation products, methods to determine concentrations of oxidant-reactive phenolic, olefinic or amine-type DOM moieties are critical.<br />Here, a novel selecti ve oxidative titration approach is presented, which is based on reaction kin etics of oxidation reactions towards certain DOM moieties. Phenolic moieties were determined by oxidative titration with ClO<sub>2</sub> and O<sub>3</su b> for five DOM isolates and two secondary wastewater effluent samples. The determined concentrations of phenolic moieties correlated with the electron- donating capacity (EDC) and the formation of inorganic ClO<sub>2</sub>-bypro ducts (HOCl, ClO<sub>2</sub><sup>−</sup>, ClO<sub>3</sub><sup>−</sup>). ClO<sub>2</sub>-byproduct yields from phenol and DOM isolates and changes du e to the application of molecular tagging for phenols revealed a better unde rstanding of oxidant-reactive structures within DOM.<br />Overall, oxidative titrations with ClO<sub>2</sub> and O<sub>3</sub> provide a novel and promi sing tool to quantify oxidant-reactive moieties in complex mixtures such as DOM and can be expanded to other matrices or oxidants.' (1422 chars)
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title => protected'Ozonation of lake water and wastewater: identification of carbonous and nitr ogenous carbonyl-containing oxidation byproducts by non-target screening' (148 chars)
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categories => protected'high resolution mass spectrometry; ozonation; carbonyl compounds; dissolved organic matter; lake water; wastewater; phenols' (123 chars)
description => protected'Ozonation of drinking water and wastewater is accompanied by the formation o f disinfection byproducts (DBPs) such as low molecular weight aldehydes and ketones from the reactions of ozone with dissolved organic matter (DOM). By applying a recently developed non-target workflow, 178 carbonous and nitroge nous carbonyl compounds were detected during bench-scale ozonation of two la ke waters and three secondary wastewater effluent samples and full-scale ozo nation of secondary treated wastewater effluent. An overlapping subset of ca rbonyl compounds (20%) was detected in all water types. Moreover, wastewater effluents showed a significantly higher fraction of <em>N</em>-containing c arbonyl compounds (30%) compared to lake water (17%). All carbonyl compounds can be classified in 5 main formation trends as a function of increasing sp ecific ozone doses. Formation trends upon ozonation and comparison of result s in presence and absence of the <sup>•</sup>OH radical scavenger DMSO in combination with kinetic and mechanistic information allowed to elucidate po tential carbonyl structures. A link between the detected carbonyl compounds and their precursors was established by ozonating six model compounds (pheno l, 4-ethylphenol, 4-methoxyphenol, sorbic acid, 3-buten-2-ol and acetylaceto ne). About one third of the detected carbonous carbonyl compounds detected i n real waters was also detected by ozonating model compounds.<br />Evaluatio n of the non-target analysis data revealed the identity of 15 carbonyl compo unds, including hydroxylated aldehydes and ketones (e.g. hydroxyacetone, con fidence level (CL) = 1), unsaturated dicarbonyls (e.g. acrolein, CL = 1; 2-butene-1,4-dial, CL = 1; 4-oxobut-2-enoic acid, CL = 2) and also a ni trogen-containing carbonyl compound (2-oxo-propanamide, CL =1).<br />Overall , this study shows the formation of versatile carbonous and nitrogenous carb onyl compounds upon ozonation involving ozone and <sup>•</sup>OH reactions . Carbonyl compounds wit...' (2196 chars)
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authors => protected'Houska, J.; Stocco, L.; Hofstetter, T. B.; Gunten, U. von' (87 chars)
title => protected'Hydrogen peroxide formation during ozonation of olefins and phenol: mechanis tic insights from oxygen isotope signatures' (119 chars)
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description => protected'Mitigation of undesired byproducts from ozonation of dissolved organic matte r (DOM) such as aldehydes and ketones is currently hampered by limited knowl edge of their precursors and formation pathways. Here, the stable oxygen iso tope composition of H<sub>2</sub>O<sub>2</sub> formed simultaneously with th ese byproducts was studied to determine if it can reveal this missing inform ation. A newly developed procedure, which quantitatively transforms H<sub>2< /sub>O<sub>2</sub> to O<sub>2</sub> for subsequent <sup>18</sup>O/<sup>16</s up>O ratio analysis, was used to determine the δ<sup>18</sup>O of H<sub>2</ sub>O<sub>2</sub> generated from ozonated model compounds (olefins and pheno l, pH 3-8). A constant enrichment of <sup>18</sup>O in H<sub>2</sub>O<sub>2< /sub> with a δ<sup>18</sup>O value of ∼59‰ implies that <sup>16</sup>O- <sup>16</sup>O bonds are cleaved preferentially in the intermediate Criegee ozonide, which is commonly formed from olefins. H<sub>2</sub>O<sub>2</sub> f rom the ozonation of acrylic acid and phenol at pH 7 resulted in lower <sup> 18</sup>O enrichment (δ<sup>18</sup>O = 47-49‰). For acrylic acid, enhanc ement of one of the two pathways followed by a carbonyl-H<sub>2</sub>O<sub>2 </sub> equilibrium was responsible for the smaller δ<sup>18</sup>O of H<sub >2</sub>O<sub>2</sub>. During phenol ozonation at pH 7, various competing re actions leading to H<sub>2</sub>O<sub>2</sub> via an intermediate ozone addu ct are hypothesized to cause lower δ<sup>18</sup>O in H<sub>2</sub>O<sub>2< /sub>. These insights provide a first step toward supporting pH-dependent H< sub>2</sub>O<sub>2</sub> precursor elucidation in DOM.' (1650 chars)
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title => protected'Formation of carbonyl compounds during ozonation of lake water and wastewate r: development of a non-target screening method and quantification of target compounds' (162 chars)
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description => protected'Ozonation of natural waters is typically associated with the formation of ca rbonyl compounds (aldehydes, ketones and ketoacids), a main class of organic disinfection byproducts (DBPs). However, the detection of carbonyl compound s in water and wastewater is challenged by multiple difficulties inherent to their physicochemical properties. A non-target screening method involving t he derivatisation of carbonyl compounds with <em>p</em>-toluenesulfonylhydra zine (TSH) followed by their analysis using liquid chromatography coupled to electrospray ionisation high-resolution mass spectrometry (LC-ESI-HRMS) and an advanced non-target screening and data processing workflow was developed . The workflow was applied to investigate the formation of carbonyl compound s during ozonation of different water types including lake water, aqueous so lutions containing Suwannee River Fulvic acid (SRFA), and wastewater. A high er sensitivity for most target carbonyl compounds was achieved compared to p revious derivatisation methods. Moreover, the method allowed the identificat ion of known and unknown carbonyl compounds. 8 out of 17 target carbonyl com pounds were consistently detected above limits of quantification (LOQs) in m ost ozonated samples. Generally, the concentrations of the 8 detected target compounds decreased in the order: formaldehyde > acetaldehyde > glyox ylic acid > pyruvic acid > glutaraldehyde > 2,3-butanedione > gl yoxal > 1-acetyl-1-cyclohexene. The DOC concentration-normalised formatio n of carbonyl compounds during ozonation was higher in wastewater and SRFA-c ontaining water than in lake water. The specific ozone doses and the type of the dissolved organic matter (DOM) played a predominant role for the extent of formation of carbonyl compounds. Five formation trends were distinguishe d for different carbonyl compounds. Some compounds were produced continuousl y upon ozonation even at high ozone doses, while others reached a maximum co ncentration at a certain...' (2551 chars)
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Oxidant-reactive carbonous moieties in dissolved organic matter: selective quantification by oxidative titration using chlorine dioxide and ozone
The application of oxidants for disinfection or micropollutant abatement during drinking water and wastewater treatment is accompanied by oxidation of matrix components such as dissolved organic matter (DOM). To improve predictions of the efficiency of oxidation processes and the formation of oxidation products, methods to determine concentrations of oxidant-reactive phenolic, olefinic or amine-type DOM moieties are critical. Here, a novel selective oxidative titration approach is presented, which is based on reaction kinetics of oxidation reactions towards certain DOM moieties. Phenolic moieties were determined by oxidative titration with ClO2 and O3 for five DOM isolates and two secondary wastewater effluent samples. The determined concentrations of phenolic moieties correlated with the electron-donating capacity (EDC) and the formation of inorganic ClO2-byproducts (HOCl, ClO2−, ClO3−). ClO2-byproduct yields from phenol and DOM isolates and changes due to the application of molecular tagging for phenols revealed a better understanding of oxidant-reactive structures within DOM. Overall, oxidative titrations with ClO2 and O3 provide a novel and promising tool to quantify oxidant-reactive moieties in complex mixtures such as DOM and can be expanded to other matrices or oxidants.
Houska, J.; Salhi, E.; Walpen, N.; von Gunten, U. (2021) Oxidant-reactive carbonous moieties in dissolved organic matter: selective quantification by oxidative titration using chlorine dioxide and ozone, Water Research, 207, 117790 (11 pp.), doi:10.1016/j.watres.2021.117790, Institutional Repository
Ozonation of lake water and wastewater: identification of carbonous and nitrogenous carbonyl-containing oxidation byproducts by non-target screening
Ozonation of drinking water and wastewater is accompanied by the formation of disinfection byproducts (DBPs) such as low molecular weight aldehydes and ketones from the reactions of ozone with dissolved organic matter (DOM). By applying a recently developed non-target workflow, 178 carbonous and nitrogenous carbonyl compounds were detected during bench-scale ozonation of two lake waters and three secondary wastewater effluent samples and full-scale ozonation of secondary treated wastewater effluent. An overlapping subset of carbonyl compounds (20%) was detected in all water types. Moreover, wastewater effluents showed a significantly higher fraction of N-containing carbonyl compounds (30%) compared to lake water (17%). All carbonyl compounds can be classified in 5 main formation trends as a function of increasing specific ozone doses. Formation trends upon ozonation and comparison of results in presence and absence of the •OH radical scavenger DMSO in combination with kinetic and mechanistic information allowed to elucidate potential carbonyl structures. A link between the detected carbonyl compounds and their precursors was established by ozonating six model compounds (phenol, 4-ethylphenol, 4-methoxyphenol, sorbic acid, 3-buten-2-ol and acetylacetone). About one third of the detected carbonous carbonyl compounds detected in real waters was also detected by ozonating model compounds. Evaluation of the non-target analysis data revealed the identity of 15 carbonyl compounds, including hydroxylated aldehydes and ketones (e.g. hydroxyacetone, confidence level (CL) = 1), unsaturated dicarbonyls (e.g. acrolein, CL = 1; 2-butene-1,4-dial, CL = 1; 4-oxobut-2-enoic acid, CL = 2) and also a nitrogen-containing carbonyl compound (2-oxo-propanamide, CL =1). Overall, this study shows the formation of versatile carbonous and nitrogenous carbonyl compounds upon ozonation involving ozone and •OH reactions. Carbonyl compounds with unknown toxicity might be formed, and it could be demonstrated that acrolein, malondialdehyde, methyl glyoxal, 2-butene-1,4-dial and 4-oxo-pentenal are degraded during biological post-treatment.
Houska, J.; Manasfi, T.; Gebhardt, I.; von Gunten, U. (2023) Ozonation of lake water and wastewater: identification of carbonous and nitrogenous carbonyl-containing oxidation byproducts by non-target screening, Water Research, 232, 119484 (17 pp.), doi:10.1016/j.watres.2022.119484, Institutional Repository
Hydrogen peroxide formation during ozonation of olefins and phenol: mechanistic insights from oxygen isotope signatures
Mitigation of undesired byproducts from ozonation of dissolved organic matter (DOM) such as aldehydes and ketones is currently hampered by limited knowledge of their precursors and formation pathways. Here, the stable oxygen isotope composition of H2O2 formed simultaneously with these byproducts was studied to determine if it can reveal this missing information. A newly developed procedure, which quantitatively transforms H2O2 to O2 for subsequent 18O/16O ratio analysis, was used to determine the δ18O of H2O2 generated from ozonated model compounds (olefins and phenol, pH 3-8). A constant enrichment of 18O in H2O2 with a δ18O value of ∼59‰ implies that 16O-16O bonds are cleaved preferentially in the intermediate Criegee ozonide, which is commonly formed from olefins. H2O2 from the ozonation of acrylic acid and phenol at pH 7 resulted in lower 18O enrichment (δ18O = 47-49‰). For acrylic acid, enhancement of one of the two pathways followed by a carbonyl-H2O2 equilibrium was responsible for the smaller δ18O of H2O2. During phenol ozonation at pH 7, various competing reactions leading to H2O2 via an intermediate ozone adduct are hypothesized to cause lower δ18O in H2O2. These insights provide a first step toward supporting pH-dependent H2O2 precursor elucidation in DOM.
Houska, J.; Stocco, L.; Hofstetter, T. B.; Gunten, U. von (2023) Hydrogen peroxide formation during ozonation of olefins and phenol: mechanistic insights from oxygen isotope signatures, Environmental Science and Technology, 57, 18950-18959, doi:10.1021/acs.est.3c00788, Institutional Repository
Formation of carbonyl compounds during ozonation of lake water and wastewater: development of a non-target screening method and quantification of target compounds
Ozonation of natural waters is typically associated with the formation of carbonyl compounds (aldehydes, ketones and ketoacids), a main class of organic disinfection byproducts (DBPs). However, the detection of carbonyl compounds in water and wastewater is challenged by multiple difficulties inherent to their physicochemical properties. A non-target screening method involving the derivatisation of carbonyl compounds with p-toluenesulfonylhydrazine (TSH) followed by their analysis using liquid chromatography coupled to electrospray ionisation high-resolution mass spectrometry (LC-ESI-HRMS) and an advanced non-target screening and data processing workflow was developed. The workflow was applied to investigate the formation of carbonyl compounds during ozonation of different water types including lake water, aqueous solutions containing Suwannee River Fulvic acid (SRFA), and wastewater. A higher sensitivity for most target carbonyl compounds was achieved compared to previous derivatisation methods. Moreover, the method allowed the identification of known and unknown carbonyl compounds. 8 out of 17 target carbonyl compounds were consistently detected above limits of quantification (LOQs) in most ozonated samples. Generally, the concentrations of the 8 detected target compounds decreased in the order: formaldehyde > acetaldehyde > glyoxylic acid > pyruvic acid > glutaraldehyde > 2,3-butanedione > glyoxal > 1-acetyl-1-cyclohexene. The DOC concentration-normalised formation of carbonyl compounds during ozonation was higher in wastewater and SRFA-containing water than in lake water. The specific ozone doses and the type of the dissolved organic matter (DOM) played a predominant role for the extent of formation of carbonyl compounds. Five formation trends were distinguished for different carbonyl compounds. Some compounds were produced continuously upon ozonation even at high ozone doses, while others reached a maximum concentration at a certain ozone dose above which they decreased. Concentrations of target and peak areas of non-target carbonyl compounds during full-scale ozonation at a wastewater treatment plant showed an increase as a function of the specific ozone dose (sum of 8 target compounds ∼ 280 µg/L at 1 mgO3/mgC), followed by a significant decrease after biological sand filtration (> 64-94% abatement for the different compounds). This highlights the biodegradability of target and non-target carbonyl compounds and the importance of biological post-treatment.
Manasfi, T.; Houska, J.; Gebhardt, I.; von Gunten, U. (2023) Formation of carbonyl compounds during ozonation of lake water and wastewater: development of a non-target screening method and quantification of target compounds, Water Research, 237, 119751 (14 pp.), doi:10.1016/j.watres.2023.119751, Institutional Repository
