Papers by Veronique Bonnelye
Aqua, May 1, 1998
This paper reviews the various methods available for removing planktonic microalgae (microstraini... more This paper reviews the various methods available for removing planktonic microalgae (microstraining, direct ®ltration, sedimentation,¯otation, polishing using ozonation and granular activated carbon [O 3 +GAC], membrane ®ltration), and discusses their comparative eectiveness, optimisation and limitations. Also described are the treatments considered most eective in the removal of odorous and/or toxic metabolites. In each case French technology and its worldwide applications are compared to those documented in the literature. The article concludes with recommendations on the most appropriate processes for treating eutrophic waters.
Journal of Water Supply: Research and Technology—AQUA, 1998
This paper reviews the various methods available for removing planktonic microalgae (microstraini... more This paper reviews the various methods available for removing planktonic microalgae (microstraining, direct ®ltration, sedimentation,¯otation, polishing using ozonation and granular activated carbon [O 3 +GAC], membrane ®ltration), and discusses their comparative eectiveness, optimisation and limitations. Also described are the treatments considered most eective in the removal of odorous and/or toxic metabolites. In each case French technology and its worldwide applications are compared to those documented in the literature. The article concludes with recommendations on the most appropriate processes for treating eutrophic waters.
Elimination des algues planctoniques : efficacité des filières modernes de traitement
La presence d'algues planctoniques dans les reseaux de distribution peut etre a l'origine... more La presence d'algues planctoniques dans les reseaux de distribution peut etre a l'origine de la degradation de la qualite de l'eau. Leur elimination necessite la mise en oeuvre de techniques separatives classiques. Le bon rendement de ces techniques separatives depend toutefois de l'optimisation de la coagulation et de la mise en oeuvre d'une preoxydation. Plusieurs exemples d'installations pilotes et industrielles temoignent de l'efficacite de la prechloration au point critique. Sur certaines qualites d'eau brute, l'utilisation du chlore peut conduire a la formation de sous-produits organochlores. La concentration de ces produits peut depasser les recommandations OMS et etre a l'origine de gouts et d'odeurs dans les eaux traitees. La prechloration tend maintenant a etre supprimee si la qualite de l'eau le permet. Dans le cas des eaux eutrophes, une preoxydation doit etre maintenue en permanence. Dans ce cas, un oxydant de substitution...
Desalination, 2008
Ultrafiltration (UF) and microfiltration (MF) are theoretically the best pre-treatment upstream r... more Ultrafiltration (UF) and microfiltration (MF) are theoretically the best pre-treatment upstream reverse osmosis, removing from the feed water most of the potential elements responsible of desalinating membranes fouling such as particles, turbidity, bacteria and large molecular weight organic maters. Those clarification membranes reduce also significantly the silt density index below 3 (100%) [1-6] and generally below 2. Many papers present results about the efficiency of UF/MF regarding clarification efficiency. UF/MF can be an economical option for RO pre-treatment. Several evaluations of the cost of UF/MF upstream RO demonstrate the interest of this pre-treatment technology on average to bad water qualities, compared to a double filtration steps conventional pre-treatment. In that case, and on a long-term operation basis, the treatment line is economically viable [7]. However, UF/MF remains more costly than a single filtration on mono or multimedia filter: UF/MF is not economically applicable on the best water quality to pre-treat. Nevertheless, UF/MF technology has some limits. If this technology is economically viable on average to bad water qualities, UF/MF direct filtration can overpass the technical limits of the process, generating the need of frequent cleanings. In that case, the RO fouling is moved upstream to the pre-treatment stage. Moreover, the clarification membranes, with cut off generally higher than 100,000 kd, do not remove the smaller organic matter molecules responsible of the biofouling development on RO membranes. In this situation, it is very difficult to demonstrate the real technical advantage of UF/MF on the RO operation, since this demonstration needs a longterm study (more than one year depending on the application) with side-by-side technologies to compare, and the results appear to be site specific. Solution of this double problem, UF/MF fouling on average to bad surface seawater and biodegradable organic matters removal, can be found in the treatment line, enhancing the UF/MF treatment by adding a precoagulation/settling of flotation. The benefits of this association of technologies are multiples, as it was developed for the treatment on surface water one decade ago for drinking water production. Moreover, the benefit of the coagulation/separation on the design (filtration flux) and operation (frequency of cleaning, membrane life duration) can significantly improve the economical balance of the process. It also allows a definitive advantage *Corresponding author.
A device for the clarification of water, and method of implementing
Of the Same Membrane Filter Cleaning Method and System for Carrying Out
Water clarification apparatus and method of operation
The present invention relates to a water clarification device comprising a flotation zone (c), a ... more The present invention relates to a water clarification device comprising a flotation zone (c), a membrane filtration zone (e) and extraction means (d), the flotation zone (c) and the membrane filtration zone (e) having a common partition wall (P), the common partition wall (P) comprising in its lower part an opening (o) allowing direct passage of the water float toward the filtration zone (e), this which leads to a supply of water membranes float upwards as well filtration phase and in phase backwashing.
Acid Mine Drainage : Case Study of One of the Largest Copper Mine Sites in the World
Mining operations are often a very intensive water user. Improving water efficiency is a critical... more Mining operations are often a very intensive water user. Improving water efficiency is a critical objective of the industry to keep operations sustainable while reducing the environmental impact. El Teniente site, a copper mine located in Chile is currently equipped with a cobalt removal water treatment plant before discharge to the environment. Some extensive pilot tests were conducted using softening, ultrafiltration and reverse osmosis for further reducing the effluent sulphate concentration. The results show stable operation of the two-stage membrane process with and without pre-softening. Additional tests on the reverse osmosis brine were successfully conducted to post-precipitation the super-saturated gypsum and further reduce the concentration of sulphate.
Water Desalination Plant Using Reverse Osmosis
Procede de nettoyage de membranes de filtration, et installation pour la mise en oeuvre de ce procede
Procede de nettoyage de membranes de filtration en fibres creuses a peau interne, comprenant les ... more Procede de nettoyage de membranes de filtration en fibres creuses a peau interne, comprenant les etapes consistant a : vider le compartiment concentrat pour evacuer le liquide a filtrer qu'il contient et les matieres en suspension, puis effectuer un retro-lavage par passage de liquide du compartiment permeat vers le compartiment concentrat au travers des membranes pour decoller et evacuer les impuretes deposees sur celles-ci tout en faisant circuler un gaz dans le concentrat. Des pulsations du gaz et/ou du liquide de retro-lavage sont provoquees par des moyens de commande (5,5a; 7, 7a) pendant au moins une phase du retro-lavage.
Process for cleaning filtration membranes, and installation for carrying out this method
Effluent treatment plant, and method of clarification and filtration using this installation
Process for treating water loaded with organic matter
Procede et installation avec pulsation de liquide et/ou gaz lors du retro-lavage de membrane de filtration
Procede de nettoyage de membranes de filtration en fibres creuses o peau interne, comprenant les ... more Procede de nettoyage de membranes de filtration en fibres creuses o peau interne, comprenant les etapes consistant a : vider le compartiment concentrat pour evacuer le liquide a filtrer qu'il contient et les matieres en suspension, puis effectuer un retro-lavage par passage de liquide du compartiment permeat vers le compartiment concentrat au travers des membranes pour decoller et evacuer les impuretes deposees sur celles-ci tout en faisant circuler un gaz dans le concentrat. Des pulsations du gaz et/ou du liquide de retro-lavage sont provoquees par des moyens de commande (5,5a; 7, 7a) pendant au moins une phase du retro-lavage.
Procede et dispositif pour la mise en contact de l'ozone dans des fluides a traiter, notamment de l'eau
Procede pour la mise en contact de l'ozone dans des fluides, notamment de l'eau, en vue d... more Procede pour la mise en contact de l'ozone dans des fluides, notamment de l'eau, en vue de leur traitement par l'ozone, mettant en oeuvre un ozoneur (14) et un appareil de dissolution de l'ozone (21) dans le fluide a traiter du type reacteur a flux piston en regime liquide monophasique, tel qu'un tube en U, caracterise en ce qu'il consiste a injecter du gaz ozone sous pression, produit par ledit ozoneur (14), dans un courant de fluide a traiter, cette injection etant realisee de maniere a obtenir des microbulles de gaz.
Installation of water desalination by reverse osmosis
Reverse osmosis water desalination plant, comprising a reverse osmosis (TP) membrane unit, at lea... more Reverse osmosis water desalination plant, comprising a reverse osmosis (TP) membrane unit, at least one high pressure pump (HP), an energy recovery unit (SRE) capable of transferring the pressure of the concentrate exiting from the membrane unit to a portion of the water to be treated, sensors of various operating parameters, in particular pressure, flow rate, temperature, salinity level, provided at appropriate locations, and control loops for the different adjustable elements remain at a set value; the plant comprises a secondary regulation (D) comprising calculation means (26) programmed to determine, from the operating conditions of the installation provided by the sensors, a combination of set values for: the flow rate of the pump high pressure, the rate of mixing of the energy recuperator, and the conversion rate, a combination that makes it possible to minimize the energy consumption of the high pressure pump.
Wasserklärvorrichtung and implementation process
Apparatus water clarification and method of making
Device water clarification comprising a flotation zone (c), an area of membrane filtration (e) ... more Device water clarification comprising a flotation zone (c), an area of membrane filtration (e) and extraction means (d), wherein the flotation zone (c) and the area of membrane filtration (e) common partition (p), characterized in that: - a wall (n) separates a mixing zone (b) of the flotation zone (c), - elements of flow rate (r) are positioned at the base of the flotation zone (c) - the common partition (p) comprises at its bottom an opening (o) allowing a direct passage of the flotation water, collected under the elements of flow rate toward the filtration zone (e ), which leads to a feed of the membranes with flotation water from the bottom up both in the filtration phase and backwash phase.
Desalin Water Treat, 2009
Nanofiltration (NF) is an alternative for micropollutant and organic matter removal. Some importa... more Nanofiltration (NF) is an alternative for micropollutant and organic matter removal. Some important aspects must be taken into account in the design and the operation (e.g., biofouling). The Vegi 2000 plant with a total production capacity of 110,000 m 3 /d is the largest NF plant built by Degrémont. Commissioning was scheduled for end of 2008. The first feedback of the plant commissioning of the plant is presented. The choice of the treatment line was linked to pilot tests carried out from 2000 to 2005. The aim was to better understand water quality problems and to compare several alternatives for the treatment; the best dissolved organic carbon (DOC) and especially biodegradable DOC reduction was targeted. Pilots were installed at the Eupen drinking water treatment plant. Ozonation coupled with granular activated carbon (GAC) absorption was tested, and different membrane alternatives were also considered (microfiltration/ultrafiltration) (MF/UF), UF + powderedactivated carbon (PAC), NF). NF was tested with Toray, Hydranautics and Dow membranes and focused on Dow membranes. The first feedback of NF will be presented in the future.
Process for Disinfecting a Filtration Works for Pretreatment of Saltwater, and Installation for the Implementation Thereof
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Papers by Veronique Bonnelye