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Urs von Gunten

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Publications associées (155)

Combination of UV absorbance and electron donating capacity to assess degradation of micropollutants and formation of bromate during ozonation of wastewater effluents

Urs von Gunten

In this study, the changes in UV absorbance at 254 nm (UVA(254)) and electron donating capacity (EDC) were investigated as surrogate indicators for assessing removal of micropollutants and bromate formation during ozonation of wastewater effluents. To meas ...

Elsevier2015

Photosensitizing and Inhibitory Effects of Ozonated Dissolved Organic Matter on Triplet-Induced Contaminant Transformation

Silvio Canonica, Urs von Gunten

Dissolved organic matter (DOM) is both a promoter and an inhibitor of triplet-induced organic contaminant oxidation. This dual role was systematically investigated through photochemical experiments with three types of DOM of terrestrial and aquatic origins ...

American Chemical Society2015

Comparison of a novel extraction-based colorimetric (ABTS) method with membrane introduction mass spectrometry (MIMS): Trichloramine dynamics in pool water (vol 58, pg 258, 2014)

Silvio Canonica, Urs von Gunten

Elsevier2015

Tracking N-nitrosodimethylamine formation during water disinfection processes by multi-element isotope fractionation analysis

Urs von Gunten, Stephanie Spahr

Amer Chemical Soc2014

Oxidative treatment of bromide-containing waters: Formation of bromine and its reactions with inorganic and organic compounds - A critical review

Urs von Gunten, Saskia Gisela Zimmermann-Steffens, Michèle Bernadette Heeb

Bromide (Br-) is present in all water sources at concentrations ranging from similar to 10 to >1000 mu g L-1 in fresh waters and about 67 mg L-1 in seawater. During oxidative water treatment bromide is oxidized to hypobromous acid/hypobromite (HOBr/OBr-) a ...

Elsevier2014

Emerging risks from ballast water treatment: The run-up to the International Ballast Water Management Convention

Urs von Gunten

Uptake and discharge of ballast water by ocean-going ships contribute to the worldwide spread of aquatic invasive species, with negative impacts on the environment, economies, and public health. The International Ballast Water Management Convention aims at ...

Elsevier2014

Reaction of Ferrate(VI) with ABTS and Self-Decay of Ferrate(VI): Kinetics and Mechanisms

Urs von Gunten, Yun Ho Lee

Reactions of ferrate(VI) during water treatment generate perferryl(V) or ferryl(IV) as primary intermediates. To better understand the fate of perferryl(V) or ferryl(IV) during ferrate(VI) oxidation, this study investigates the kinetics, products, and mech ...

Amer Chemical Soc2014

Column studies to assess the effects of climate variables on redox processes during riverbank filtration

Janet Gordon Hering, Urs von Gunten

Riverbank filtration is an established technique used world-wide to produce clean drinking water in a reliable and cost-efficient way. This practice is, however, facing new challenges posed by climate change, as already observed during past heat waves with ...

Elsevier2014

Toxicity evaluation of synthetic waters based on Br-Cl-I-THMs formation during the chlorine/ammonia process

Urs von Gunten

Amer Chemical Soc2014

NOM degradation during river infiltration: Effects of the climate variables temperature and discharge

Janet Gordon Hering, Urs von Gunten

Most peri-alpine shallow aquifers fed by rivers are oxic and the drinking water derived by riverbank filtration is generally of excellent quality. However, observations during past heat waves suggest that water quality may be affected by climate change due ...

Pergamon-Elsevier Science Ltd2013

Advanced oxidation processes for the degradation of CCL3 compounds: Assessment of the toxicity of transformation products

Silvio Canonica, Kristin Schirmer, Urs von Gunten

Amer Chemical Soc2013

Dissolved organic matter as a photosensitizer and an inhibitor of triplet-induced transformation of water contaminants

Silvio Canonica, Urs von Gunten

Amer Chemical Soc2013

Formation of N-nitrosamines from chlorination and chloramination of molecular weight fractions of natural organic matter

Urs von Gunten, Ina Kristiana

N-Nitrosamines are a class of disinfection by-products (DBPs) that have been reported to be more toxic than the most commonly detected and regulated DBPs. Only a few studies investigating the formation of N-nitrosamines from disinfection of natural waters ...

Elsevier2013

Ozonation of iodide-containing waters: Selective oxidation of iodide to iodate with simultaneous minimization of bromate and I-THMs

Urs von Gunten

The presence of iodinated disinfection by-products (I-DBPs) in drinking water poses a potential health concern since it has been shown that I-DBPs are generally more genotoxic and cytotoxic than their chlorinated and brominated analogs. I-DBPs are formed d ...

Elsevier2013

Oxidation of dissolved organic matter with ozone, chlorine, and chlorine dioxide: Effects on optical and antioxidant properties

Silvio Canonica, Urs von Gunten

Amer Chemical Soc2013

Enhanced N-nitrosamine formation in pool water by UV irradiation of chlorinated secondary amines in the presence of monochloramine

Silvio Canonica, Urs von Gunten, Minju Lee

N-Nitrosamines, in particular N-nitrosodimethylamine (NDMA), are carcinogens, which occur as chlorine disinfection by-products (DBPs) in swimming pools and hot tubs. UV treatment is a commonly used technique in swimming pools for disinfection and DBP atten ...

Elsevier2013

Benzotriazoles: Reactivity toward UV-C light and the hydroxyl radical, and removal by the UV/H2O2 process

Silvio Canonica, Urs von Gunten

Amer Chemical Soc2013

Elimination of Micropollutants during Post-Treatment of Hospital Wastewater with Powdered Activated Carbon, Ozone, and UV

Hansruedi Siegrist, Urs von Gunten

A pilot-scale hospital wastewater treatment plant consisting of a primary clarifier, membrane bioreactor, and five post-treatment technologies including ozone (O-3), O-3/H2O2, powdered activated carbon (PAC), and low pressure UV light with and without TiO2 ...

American Chemical Society2013

Prediction of Micropollutant Elimination during Ozonation of Municipal Wastewater Effluents: Use of Kinetic and Water Specific Information

Urs von Gunten, Minju Lee, Yun Ho Lee

Ozonation, is effective in improving the quality of, municipal wastewater effluents by eliminating organic micropollutants. Nevertheless, ozone process design is still limited by (i) the large number of structurally diverse micropollutants and (ii) the var ...

American Chemical Society2013

Chemical Oxidation of Dissolved Organic Matter by Chlorine Dioxide, Chlorine, And Ozone: Effects on Its Optical and Antioxidant Properties

Silvio Canonica, Urs von Gunten

In water treatment dissolved organic matter (DOM) is typically the major sink for chemical oxidants. The resulting changes in DOM, such as its optical properties have been measured to follow the oxidation processes. However, such measurements contain only ...

Amer Chemical Soc2013

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