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Concept

Coagulation-floculation

Publications associées (19)

Effect of wastewater treatment and environmental exposure on an enterovirus population

Odile Marie Clotilde Hervás de Nalda-Larivé

The presence of viruses in recreational water can present a risk for human health and wastewater effluent is a source of virus in the environment. Their persistence in the environment influences their probability to find a new host. Studies have shown that ...

EPFL2022

The effect of different organic substrates on the microbial communities of aerobic granular wastewater treatment sludge

Aline Sondra Adler

Aerobic granular sludge (AGS) is a promising alternative wastewater treatment to the conven- tional activated sludge system, allowing space and energy savings. This process is particularly suited for biological phosphorus removal, avoiding use of coagulant ...

EPFL2019

Behavior of NDMA precursors at 21 full-scale water treatment facilities

Urs von Gunten

A source-to-tap evaluation of the origin and fate of chloramination N-nitrosodimethylamine (NDMA) precursors at 21 full-scale drinking water plants was conducted. Upstream wastewater discharges accounted for (on a median basis) similar to 16 ng L-1 NDMA fo ...

ROYAL SOC CHEMISTRY2018

Micropollutant degradation, bacterial inactivation and regrowth risk in wastewater effluents: Influence of the secondary (pre)treatment on the efficiency of Advanced Oxidation Processes

César Pulgarin, Luiz Felippe De Alencastro, Stefanos Giannakis, Dominique Grandjean

In this work, disinfection by 5 Advanced Oxidation Processes was preceded by 3 different secondary treatment systems present in the wastewater treatment plant of Vidy, Lausanne (Switzerland). 5 AOPs after two biological treatment methods (conventional acti ...

Elsevier2016

Formation of N-nitrosodimethylamine during water disinfection with chloramine : insights into reaction mechanisms from isotope fractionation analyses

Stephanie Spahr

Disinfection processes such as chlorination, chloramination, and ozonation are a crucial measure to provide safe drinking water because they effectively inactivate pathogenic microorganisms. However, these processes can also lead to the formation of harmfu ...

EPFL2016

Correlation between flocculation and adsorption of cationic polyacrylamides on precipitated calcium carbonate

Jutta Christine Wandrey, David Hunkeler, Hamideh Ahmadloo

The study of each stage of the flocculation process is essential to better understand and predict flocculation mechanisms. The adsorption of cationic polyacrylamide derivatives (C-PAM) onto precipitated calcium carbonate (PCC) has been investigated systema ...

Inst Chemical Engineers2015

Molecular Mechanism of Flocculation Self-Recognition in Yeast and Its Role in Mating and Survival

Sandor Kasas, Livan Bladimir Alonso Sarduy

We studied the flocculation mechanism at the molecular level by determining the atomic structures of N-Flo1p and N-Lg-Flo1p in complex with their ligands. We show that they have similar ligand binding mechanisms but distinct carbohydrate specificities and ...

American Society for Microbiology2015

Effect of advanced oxidation processes on the micropollutants and the effluent organic matter contained in municipal wastewater previously treated by three different secondary methods

César Pulgarin, Luiz Felippe De Alencastro, Dominique Grandjean, Stefanos Giannakis

In this study, wastewater from the output of three different secondary treatment facilities (Activated Sludge, Moving Bed Bioreactor and Coagulation-Flocculation) present in the municipal wastewater treatment plant of Vidy, Lausanne (Switzerland), was furt ...

Elsevier2015

Coupling between high-frequency ultrasound and solar photo-Fenton at pilot scale for the treatment of organic contaminants: An initial approach

César Pulgarin, Stefanos Papoutsakis

This study aims to evaluate the performance of a novel pilot-scale coupled system consisting of a high frequency ultrasonic reactor (400 kHz) and a compound parabolic collector (CPC). The benefits of the concurrent application of ultrasound and the photo-F ...

Elsevier2015

An experimental design methodology to evaluate the importance of different parameters on flocculation by polyelectrolytes

Jutta Christine Wandrey, David Hunkeler, Hamideh Ahmadloo

Aggregation of particles is fundamental for improving the performance of many solid/liquid processes. Aggregation can be induced by different means, and one of the most common is based on the addition of polymeric additives, namely polyelectrolytes. In thi ...

Elsevier Science Sa2013

Model-based automated testing of critical PLC programs

Simon Bliudze, Jean-Charles Tournier

Testing of critical PLC (Programmable Logic Controller) programs remains a challenging task for control system engineers as it can rarely be automated. This paper proposes a model-based approach which uses the BIP (Behavior, Interactions and Priorities) fr ...

IEEE2013

Structure sensitivity of selective acetylene hydrogenation over the catalysts with shape-controlled palladium nanoparticles

Lioubov Kiwi, Rocio Micaela Crespo Quesada, Artur Elterovich Yarulin

The structure sensitivity of acetylene hydrogenation on catalysts with controlled shape of palladium nanoparticles was studied. Palladium particles of cubic (Pd-cub), cuboctahedral (Pd-co) and octahedral (Pd-oct) shapes were obtained by a colloidal method. ...

SP MAIK Nauka/Interperiodica, Springer2012

Solution viscosity and flocculation characteristics of linear polymeric flocculants in various media

Jutta Christine Wandrey, David Hunkeler

Rheological characteristics of linear copolymers of acrylamide (AM) and acryloyloxyethyltrimethyl ammonium chloride (Q9), differing in molar mass and chemical composition, have been studied in distilled water (DW) and industrial water (IW) obtained from a ...

2011

Flocculation by Cationic Polyelectrolytes: Relating Efficiency with Polyelectrolyte Characteristics

Jutta Christine Wandrey, David Hunkeler

A series of acrylamide/dimethylaminoethylacrylate methyl chloride copolymers (AM-co-DMAEA) was evaluated as flocculants for model Precipitated Calcium Carbonate (FCC) in distilled water. These cationic polyelectrolytes (PEL) differed by their AM/DMAEA rati ...

Wiley-Blackwell2010

Inactivation of MS2 coliphage in Fenton and Fenton-like systems: role of transition metals, hydrogen peroxide and sunlight

Tamar Kohn, Andrzej Sienkiewicz, Jessica Ivana Nieto Juarez

The inactivation of coliphage MS2 by iron- and copper-catalyzed Fenton systems was studied to assess the importance of this process for virus inactivation in natural systems and during water treatment by advanced oxidation processes. The influence of H2O2 ...

American Chemical Society2010

Recyclage des eaux usées en irrigation : potentiel fertilisant, risques sanitaires et impacts sur la qualité des sols

The present study takes place in Ouagadougou (Burkina Faso), a typical Sub-Saharan city where water shortage and food crisis necessitate wastewater reuse in urban agriculture. Different issues linked to this practice were studied in two components separate ...

EPFL2009

Design approach for the improvement of the economic and environmental performances of potable water supply

François Vince

Triggered by the Kyoto Protocol and by the aggravation of freshwater scarcity, environmental impacts should soon become key decision criteria for the planning of potable water supply projects, especially when advanced systems such as seawater desalination ...

EPFL2008

Développement et validation de méthodes dosimétriques en ligne pour le traitement du cancer de la prostate

Valéry-Olivier Zilio

Currently, the treatment of prostate cancer under open MRI at the University of Geneva Hospital, applying high dose rate (HDR) brachytherapy, involves three main steps : needle implantation, dosimetric calculations and irradiation. As such, there is no pre ...

EPFL2005

Coagulants of Moringa Oleifera Lam. seeds : purification & characterisation

Stephan Dörries

Water has been declared a human right by the United Nations, thus urging countries who have ratified the International Covenant on Economic, Social and Cultural Rights to ensure supply with drinking water for their populations1. However, supply of drinking ...

EPFL2005