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Tamar Kohn

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Publications associées (102)

A modeling approach to estimate the solar disinfection of viral indicator organisms in waste stabilization ponds and surface waters

Michael Jon Mattle, Tamar Kohn

Sunlight is known to be a pertinent factor governing the infectivity of waterborne viruses in the environment. Sunlight inactivates viruses via endogenous inactivation (promoted by absorption of UVB sunlight by the virus) and exogenous processes (promoted ...

Elsevier2016

Genetic, structural and phenotypic properties of MS2 coliphage with resistance to ClO2 disinfection

Virginie Bachmann, Tamar Kohn, Qingxia Zhong, Petr Leiman, Sergey Nazarov, Anna Carratala Ripolles, Laura Piccinini, Ricardo Cesar Guerrero Ferreira

Common water disinfectants like chlorine have been reported to select for resistant viruses, yet little attention has been devoted to characterizing disinfection resistance. Here, we investigated the resistance of MS2 coliphage to inactivation by chlorine ...

Amer Chemical Soc2016

Bacteria inactivation during the drying of struvite fertilizers produced from stored urine

Loïc Decrey, Manfred Schoger, Tamar Kohn, Simon Schindelholz, Kai Udert

Human urine can be processed into market-attractive fertilizers like struvite; however, concerns regarding the microbial safety of such products remain. The present study evaluated the inactivation of in situ heterotrophs, total bacteria as observed by flo ...

Amer Chemical Soc2016

Ammonia as an in-situ sanitizer: influence of virus genome type on inactivation

Loïc Decrey, Tamar Kohn, Shinobu Kazama

Treatment of human excreta and animal manure (HEAM) is key in controlling the spread of persistent enteric pathogens such as viruses. The extent of virus inactivation during HEAM storage and treatment appeared to vary with virus genome type, though the rea ...

American Society for Microbiology2016

Solar disinfection (SODIS) of viruses in PET bottles

Michael Jon Mattle, Tamar Kohn, Alex Dionisio Calado, Anna Carratala Ripolles

Solar disinfection of drinking water in PET bottles (SODIS) is a simple point-of-use technique efficient for the inactivation of many bacterial pathogens. In contrast, the efficiency of SODIS toward viruses is not well known. In this work, we studied the i ...

American Society for Microbiology2016

Super-fine powdered activated carbon (SPAC) for efficient removal of micropollutants from wastewater treatment plant effluent

Florence Bonvin, Tamar Kohn, Livia Jost, Léa Cécile Randin

In an effort to mitigate the discharge of micropollutants to surface waters, adsorption of micropollutants onto powdered activated carbon (PAC) after conventional wastewater treatment has been identified as a promising technology for enhanced removal of ph ...

Elsevier2016

Viruses at solid-water interfaces: A systematic assessment of interactions driving adsorption

Anne Thérèse Sigstam, Tamar Kohn, Antonius Magdi Hakeem Armanious, Dominik Refardt, Meret Aeppli

Adsorption to solid-water interfaces is a major process governing the fate of waterborne viruses in natural and engineered systems. The relative contributions of different interaction forces to adsorption and their dependence on the physicochemical propert ...

Amer Chemical Soc2016

Inactivation kinetics and mechanisms of viral and bacterial pathogen surrogates during urine nitrification

Tamar Kohn, Ariane Schertenleib, Kai Udert

This paper assesses the inactivation performance and mechanisms in urine nitrification reactors using bacteria and bacteriophages as surrogates for human pathogens. Two parallel continuous-flow moving bed biofilm reactors (MBBRs) were operated over a two-m ...

Royal Soc Chemistry2015

Technologies for the treatment of source-separated urine in the eThekwini Municipality

Bastian Etter, Tamar Kohn, Kai Udert, Linda Strande

In recent years, a large number of urine-diverting dehydration toilets (UDDTs) have been installed in eThekwini to ensure access to adequate sanitation. The initial purpose of these toilets was to facilitate faeces drying, while the urine was diverted into ...

2015

Pathogens and pharmaceuticals in source-separated urine in eThekwini, South Africa

Tamar Kohn, Kai Udert, Linda Strande, Christa McArdell

In eThekwini, South Africa, the production of agricultural fertilizers from human urine collected from urine-diverting dry toilets is being evaluated at a municipality scale as a way to help finance a decentralized, dry sanitation system. The present study ...

Elsevier2015

A conceptual model and experimental framework to determine the contributions of direct and indirect photoreactions to the solar disinfection of MS2, phiX174 and adenovirus

Michael Jon Mattle, Tamar Kohn

Sunlight inactivates waterborne viruses via direct (absorption of sunlight by the virus) and indirect processes (adsorption of sunlight by external chromophores, which subsequently generate reactive species) processes. While the mechanisms underlying these ...

Amer Chemical Soc2015

Ammonia as an in-situ sanitizer: inactivation kinetics and mechanisms of the ssRNA virus MS2 by NH3

Loïc Decrey, Tamar Kohn, Shinobu Kazama, Kai Udert

Sanitizing human and animal waste (e.g., urine, fecal sludge or grey water) is a critical step in reducing the spread of disease and ensuring microbially safe reuse of waste materials. Viruses are particularly persistent pathogens and can be transmitted th ...

2015

Spatial extent and ecotoxicological risk assessment of a micropollutant-contaminated wastewater plume in Lake Geneva

Florence Bonvin, Jeremy Samuel Arey, Tamar Kohn, Auréline Grange, Lorenzo Martelletti, Rebecca Rutler, Yosef Akhtman

In this study, the spatial extent of a wastewater-influenced water mass originating from a wastewater treatment plant outlet in Vidy Bay (Lake Geneva) was monitored by two manned submersibles from June to August 2011. The main goal was to assess whether mi ...

Springer Verlag2014

UVC inactivation of dsDNA and ssRNA viruses in water: UV fluences and a qPCR-based approach to evaluate decay on viral infectivity

Tamar Kohn, Anna Carratala Ripolles

Disinfection by low-pressure monochromatic ultraviolet (UVC) radiation (253.7 nm) became an important technique to sanitize drinking water and also wastewater in tertiary treatments. In order to prevent the transmission of waterborne viral diseases, the an ...

Springer2014

On the cause of the tailing phenomenon during virus disinfection by chlorine dioxide

Anne Thérèse Sigstam, Tamar Kohn, Moritz Brennecke, Qingxia Zhong, Andreas Rohatschek

This study investigates the mechanisms underlying the deviation from Chick-Watson kinetics, namely a tailing curve, during the disinfection of viruses by chlorine dioxide (ClO2). Tailing has been previously reported, but is typically attributed to the deca ...

Elsevier2014

Direct effects of dominant winds on residence and travel times in the wide and open lacustrine embayment: Vidy Bay (Lake Geneva, Switzerland)

Ulrich Lemmin, Florence Bonvin, David Andrew Barry, Tamar Kohn, Roham Bakhtyar, Amir Mehdi Razmi

Numerical simulations were carried out to determine the residence (or flushing) time of water in Vidy Bay (north shore of Lake Geneva) for different meteorological conditions. A hydrodynamic model (Delft3DFLOW) was applied to simulate the flow field in the ...

Springer Verlag2014

Subtle differences in virus composition affect disinfection kinetics and mechanisms

Anne Thérèse Sigstam, Michele Cascella, Tamar Kohn, Brian Pecson, Krista Rule Wigginton

Viral disinfection kinetics have been studied in depth, but the molecular-level inactivation mechanisms are not understood. Consequently, it is difficult to predict the disinfection behavior of non-culturable viruses, even when related, culturable viruses ...

American Society for Microbiology2013

Inactivation of human adenovirus by UV and singlet oxygen as examined by quantitative protein mass spectrometry

Tamar Kohn, Florence Armand, Romain Hamelin, Franziska Sara Bosshard

Amer Chemical Soc2013

Mechanisms of Human Adenovirus Inactivation by Sunlight and UVC Light as Examined by Quantitative PCR and Quantitative Proteomics

Tamar Kohn, Florence Armand, Romain Hamelin, Franziska Sara Bosshard

Human adenoviruses (HAdV) are important pathogens in both industrialized and developing nations. HAdV has been shown to be relatively resistant to monochromatic UVC. Polychromatic UVC, in contrast, is a more effective means of disinfection, presumably due ...

American Society for Microbiology2013

Virus removal and inactivation by iron (hydr)oxide-mediated Fenton-like processes under sunlight and in the dark

Tamar Kohn, Jessica Ivana Nieto Juarez

Advanced oxidation processes (AOPs) have emerged as a promising alternative to conventional disinfection methods to control microbial water quality, yet little is known about the fate of viruses in such processes. In this study, we investigated the fate of ...

Royal Society of Chemistry2013

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