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Vandœuvre-lès-Nancy, France

Pallares A.,University of Strasbourg | Fischer S.,UBERTONE | France X.,GEMCEA | Pons M.N.,CNRS Reactions and Process Engineering Laboratory | Schmitt P.,University of Strasbourg
Flow Measurement and Instrumentation | Year: 2015

This paper focuses on the use of the raw acoustical turbidity and velocity data as a flow online monitoring tool. Its aim is to demonstrate that, with adequate instrumental settings, interesting results can directly be seen on the raw data. As illustration, some experimental results on a combined acoustic turbidity and velocity analysis on a river are shown. It demonstrates the great potential of the acoustic measurements in sediment transport studies by the combined information on velocity and turbidity. Another application is the study of a wastewater collector inlet for which the comparison with standard measurement methods is possible. The acoustic turbidity raw data can easily be used for qualitative suspended solids concentration studies. It is also shown that more accurate results on the water height can be obtained through the acoustic turbidity. © 2015.

Battaglia P.,GEMCEA | Pons M.N.,University of Lorraine | Petit M.,GEMCEA | France X.,GEMCEA
Techniques - Sciences - Methodes | Year: 2010

Local authorities have the willingness to improve their small urban streams. This goes together with legal requirements including the European Water Framework Directive (2006/60/CE), which requires the European member countries to reach a good ecological water quality by 2015. Because of the major and multiple issues in living urban areas, and the restrictions associated with land availability, the diagnosis phase is a central requirement. A diagnosis methodology specifically adapted to urban streams has been developed. It can be divided into two levels, the first one being a simple inventory, inexpensive in terms of material, transposable to any other suburban stream, and requiring little material and support, while the second level is complementary to the first one, aiming at high impact sites, and requires more significant technical and financial supports, as well as a longer investigation period. The main investigated domains are: physical environment, hydrology, water and biological qualities.

Bouarab A.,CNRS Reactions and Process Engineering Laboratory | Bouarab A.,Veolia | Baudin-Bizien I.,Veolia | France X.,GEMCEA | And 2 more authors.
IFAC Proceedings Volumes (IFAC-PapersOnline) | Year: 2014

The efficiency of an in-line stormwater physic-chemical treatment system combining sand removal, flocculation-coagulation and subsequent settling has been assessed by simulation. Such a system is designed to both reduce the discharge of pollution during storm events in receiving water bodies and to avoid disturbances on the downstream wastewater treatment plant. The stormwater treatment model, based on an existing system, is combined to the Benchmark Simulation Model 2 wastewater treatment plant. It is demonstrated that such a stormwater treatment system can improve the wastewater treatment plant performance by reducing the violations of the effluent quality constraints, but that such improvement is mostly due to a hydraulic effect. © IFAC.

Pasquini L.,University of Lorraine | Munoz J.-F.,Nancy Laboratory for Hydrology | Rimlinger N.,Nancy Laboratory for Hydrology | Dauchy X.,Nancy Laboratory for Hydrology | And 3 more authors.
Chemical Papers | Year: 2013

Everyday domestic activity is a significant source of water pollution. The presence of six household micropollutants in an urban wastewater treatment plant (WWTP) was assessed in wastewater and sludge. A multi-target analytical method was developed for the quantification of ibuprofen, erythromycin, ofloxacin, 4-nonylphenol, 5-chloro-2-(2,4-dichlorophenoxy)phenol (triclosan), and sucralose. The micropollutants were extracted from the liquid and solid phases and their concentrations were determined by LC-MS/MS. The efficiency of micropollutants' removal within a conventional activated sludge process was assessed. From 50 % to 90 % of ibuprofen and erythromycin was removed from the wastewater liquid phase. Their removal can be attributed to biological degradation as they were not found adsorbed on the outlet sludge. Ofloxacin and triclosan were removed from the liquid phase with similar efficiencies; however, they were adsorbed on the sludge, so it was not possible to determine their removal mechanism (whether biodegradation or displacement to solid phase/sequestration). Sucralose was not removed from wastewater (3 μg L -1 in inlet and outlet liquid phase) and not adsorbed on the sludge. 4-Nonylphenol concentrations were sometimes higher in the WWTP outlet water; this may relate to the degradation of alkylphenol ethoxylates in the wastewater treatment process. 4-Nonylphenol was always present in the outlet sludge. © 2013 Institute of Chemistry, Slovak Academy of Sciences.

Joannis C.,Laboratoire Central des Ponts et Chaussees | Ruban G.,Laboratoire Central des Ponts et Chaussees | Aumond M.,Laboratoire Central des Ponts et Chaussees | Bertrand-Krajewski J.-L.,INSA Lyon | And 4 more authors.
Techniques - Sciences - Methodes | Year: 2010

This paper presents possible objectives for turbidity monitoring in sewerage, and provides details on key issues for getting reliable and accurate turbidity measurements. It relies on the experience gathered during their field work by four French research teams. The topics considered here are the choice of a sensor, calibration procedures, the choice of a measuring site, different in situ implementation modes, sampling strategy, maintenance and uncertainty assessment. A brief description of a few case studies follow up this overview.

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