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Publications (30)
Cette étude porte sur une technologie de densification des boues appliquée à un procédé à boues activées continue. Par la combinaison d'une sélection microbienne (zone anaérobie) et physique (extraction sélective par hydrocyclones), cette technologie permet de générer une proportion significative de biomasse sous forme granulaire, améliorant ainsi...
Au sein des filières de traitement des eaux usées utilisant le procédé conventionnel à boues activées, les propriétés de décantation des boues au sein du clarificateur secondaire sont susceptibles d’être dégradées, notamment lors de phénomènes de prolifération de bactéries filamenteuses. Cette étude vise à caractériser la décantation de boues obten...
Conventional activated sludge (CAS) and densified sludge obtained using hydro-cyclone selective wasting were compared at a full-scale water resources recovery facility. The densified tested sludge, containing around 30–50% of aerobic granules, showed enhanced settleability with low and stable sludge volume index (SVI) compared to CAS, which suffere...
Environmental water monitoring requires the estimation of the suspended solids load. In this paper, we compare the concentration range accessible through three different techniques: optical turbidity, acoustic backscattering and the newly in-lab developed time resolved optical turbidity. We focus on their comparison on measurements made in the labo...
Knowledge on Suspended Sediment Concentration (SSC) leads to a better understanding of sediment transport dynamics, which is of main interest to understand river geomorphology or handle the wastewater regulation and treatment. For this purpose, optical and acoustic turbidity are both used to monitor continuously the suspended solids content in wate...
The suspended sediment concentration (SSC) is a key element for water quality monitoring. Optical turbidity is already widely used as SSC indicator and acoustic backscattering devices are still under investigation. Recent observations on a wastewater network showed huge differences between the behaviour of optical and acoustic turbidity according t...
The knowledge of sediment transport characteristics is an important issue in terms of sewer and surface water management. In order to monitor these phenomena in sewage, the Suspended Solids Concentration (SSC) is usually measured either by ad hoc analysis on samples or by optical turbidity which is the most commonly used continuous measurement tech...
In order to monitor these phenomena, the Suspended Solids Concentration is usually measured either by ad hoc analyzes on samples or continuously by optical turbidity. We compared these conventional techniques to explain, in terms of particle presence, the variations of real time acoustic turbidity. The Ultrasonic Doppler Velocity Profiler (UVP) als...
Sediment transport, either in natural environment or in sewer systems is of main interest to understand river geomorphology or handle the wastewater regulation and treatment. Knowledge on Suspended Sediment Concentration (SSC) and size distribution leads to a better understanding of sediment transport dynamics. In a wide range of rivers and sewer n...
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...
This paper focuses on the use of acoustic turbidity as an online monitoring tool. Some experimental results on river and sewer network are shown. The river data analysis demonstrates the great potential of the acoustic measurements in sediment transport studies. The sewer data shows different application as suspended sediments concentration or wate...
The potential of the acoustic measurement is currently not sufficiently exploited in the context of the monitoring of urban wastewater. The decomposition of the acoustic signal indicates that the acoustic turbidity is sensitive to the nature of the suspended particles and their concentrations. So the acoustic characteristics (form function and tota...
This paper presents a collaborative study of the Universities of Strasbourg and Hokkaido with the support of Ubertone. Its goal is to analyze and understand the ultrasound wave behavior at the water-air boundary. Measurements with an Ubertone UB-Flow profiler have been done for different water height and discharge configurations on a flume of 16 me...
This work describes the ultrasound approach for measuring settling velocities of wastewaters. The method is tuned starch particles, good representatives of the organic matter in wastewater. A comparison of starch settling velocity and real wastewater settling velocity obtained by ultrasounds with the same measurements obtained by the standard proto...
Wastewater regulation and treatment is still a major concern in planetary pollution management. Some pollutants, referred to as particulate matter, consist of very small particles just suspended in the water. Various techniques are used for the suspended particles survey. Few of them are able to provide real-time data. The development of new, real...
Apres un rappel sur l'effet Doppler, les principes courants de mesure de vitesse utilisant les ondes ultrasonores seront rapidement presentes. Cet article se focalisera ensuite sur la methode de mesure utilisant les ondes ultrasonores pulsees, qui presente notamment l'avantage de pouvoir mesurer un profil de vitesses. Plusieurs techniques d'estimat...
In the frame of a technological research and innovation network in water and environment technologies (RITEAU, Réseau de Recherche et d'Innovation Technologique Eau et Environnement), our research group, in collaboration with industrial partners and other research institutions, has been in charge of the development of a suitable flowmeter: an ultra...
After a short description of the Doppler effect, common principles usedfor velocity measurements by ultra-sound will be explained. Afterwards, thispaper will focus on the pulsed beam method which allows velocity profilecharacterization. Several estimation techniques might be used to extract thevelocity information from the raw data. Distinction is...
Modern sewer systems are subject to increasingly stringent water policy laws. For wastewater management, important parameters are flow rates and pollutant loads conveyed in sewers. Precise knowledge of pollutant fluxes thus requires a better assessment of both the velocity and suspended matter fields. The aim of our work is an experimental characte...
In all measurement techniques one seeks accuracy and precision. In ultrasonic Doppler velocimetry, those qualities strongly depend on signal to noise ratio of the Doppler signal and on the performance of the velocity estimator. The most widely used estimation method in ultrasonic coherent Doppler velocimetry is the pulse pair method. Its success is...
L'un des problèmes rencontrés en gestion des eaux usées est la mesure des flux de
polluants. Dans le cadre d’un projet RITEAU, l’IMFS développe un fluxmètre en
collaboration avec les industriels IRH Environnement et ULTRAFLUX, le laboratoire
CRAN et l’ENGEES. L’objectif de l’étude est de développer un dispositif ultrasonore
en réseau d’eau pour la...
L'un des problèmes rencontrés en gestion des eaux usées est la mesure des flux de polluants. Dans le cadre dun projet RITEAU, débuté en juillet 2003, lIMFS développe un fluxmètre en collaboration avec les industriels IRH Environnement et ULTRAFLUX, le laboratoire CRAN et lENGEES. Lobjectif de létude est de développer un dispositif ultrasonore...
A major concern in waste water management is the real time pollutant flow measurement and identification. Traditional acoustic instruments only allow mean velocity or flow measurement. Concentration of solid pollutants, namely suspended sediments, is obtained through dessication of water samples. In the frame of a technological research and innovat...
Real-time sewer networks survey becomes a major key in wastewater regulation. Needs for continuous and precise information, especially in wastewater discharge, increase in importance. In the frame of a technological research and innovation network in water and environment technologies (RITEAU), our research group, in collaboration with industrial p...
Wastewater regulation and treatment is still a major concern in planetary pollution management. Some pollutants, referred to as particulate matter, consist of very small particles just suspended in the water. Various techniques are used for the suspended particles survey. Few of them are able to provide real-time data. The development of new, real...
Coherent ultrasonic Doppler velocimeters provide precise and accurate measurements of velocity profiles in many applications. However, these instruments suffer from the well known range-velocity ambiguity, making this kind of instruments not well suited for velocity measurements in channels of several meters depth and water velocities of some meter...
Nous présentons dans cet article un algorithme pour la mesure des profils de vitesse dans un écoulement chargé par lutilisation dondes ultrasonores pulsées. La méthode employée se base sur lestimation de la différence du temps daller-retour de londe émise dune période démission à lautre par intercorrélation des signaux fenêtrés correspondan...
