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| Cordier, Clemence; Stavrakakis, Christophe; Sauvade, Patrick; Coelho, Franz; Moulin, Philippe. |
| Among all the techniques studied to overcome fouling generated in dead-end filtration, the injection of air during backwashes proved to be the most effective. Indeed, shear stress engendered by the two-phase flow enhanced particle removal on membrane surface. This work aims to study the injection of air to drain the membranes before backwash. Firstly, the efficiency of this backwash procedure was evaluated during the ultrafiltration of seawater on a semi industrial pilot plant using different operating conditions. Then, the treatment of seawater, doped with oyster gametes to simulate the filtration of shellfish hatchery effluents, was performed to confirm the hydraulic performance of the air backwash. Indeed, the release of gametes, expulsed by exotic... |
| Tipo: Text |
Palavras-chave: Ultrafiltration; Air backwash; Efficiency; Viability of organic matter; Shellfish hatchery effluents. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00451/56270/57842.pdf |
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| Cordier, Clémence; Guyomard, Killian; Stavrakakis, Christophe; Sauvade, Patrick; Coelho, Franz; Moulin, Philippe. |
| The culture of microalgae is important for the production and maintenance of bivalves. One of the major challenges is to maintain the reliability of microalgae forages over the long term. The aim of this work is to use Ultrafiltered (UF) seawater to cultivate them. Thus, cultures in a volume of 300 L of 2 species of microalgae Tetraselmis and T-isochrysis, were monitored in UF water (membrane pore size: 20 nm) and in sea water usually used on the Ifremer mollusk experimental platform of Bouin (France) (Prefiltration, 3 filtrations and 2 UV). The major result is the securing of microlagae cultures with the absence of parasites in all cultures supplied with ultrafiltered water, unlike analyses of the various control cultures. In the case of T-isochrysis, 3... |
| Tipo: Text |
Palavras-chave: Microalgae; Ultrafiltration; Water Purification; Shellfish Production. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00630/74182/73785.pdf |
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| Cordier, C; Eljaddi, Tarik; Ibouroihim, Nadjim; Stavrakakis, Christophe; Sauvade, Patrick; Coelho, Franz; Moulin, Philippe. |
| The main objective of this paper is to study the effect of new air backwash on dead-end ultrafiltration of seawater with a pilot at semi-industrial scale (20 m3/day). To control membrane fouling, two different backwashes were used to clean the membrane: classical backwash (CB) and new air backwash (AB) that consists of injecting air into the membrane module before a classical backwash. To evaluate the efficiency of AB and CB, a resistance in series model was used to calculate each resistance: membrane (Rm), reversible (Rrev) and irreversible (Rirr). The variation of the seawater quality was considered by integrating the turbidity variation versus time. The results indicate clearly that AB was more performant than CB and frequency of AB/CB cycles was... |
| Tipo: Text |
Palavras-chave: Ultrafiltration; Seawater treatment; Air backwash; Fouling control. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00625/73682/73146.pdf |
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| Cordier, Clémence; Stavrakakis, Christophe; Morga, Benjamin; Degrémont, Lionel; Voulgaris, Alexandra; Bacchi, Alessia; Sauvade, Patrick; Coelho, Franz; Moulin, Philippe. |
| Among water treatment processes, ultrafiltration is known to be efficient for the elimination of micro-organisms (bacteria and viruses). In this study, two pathogens were targeted, a bacterium, Vibrio aestuarianus and a virus, OsHV-1, with the objective to produce high quality water from seawater, in the case of shellfish productions. The retention of those microorganisms by ultrafiltration was evaluated at labscale. In the case of OsHV-1, the protection of oysters was validated by in vivo experiments using oysters spat and larvae, both stages being highly susceptible to the virus. The oysters raised using contaminated seawater which was then subsequently treated by ultrafiltration, had similar mortality to the negative controls. In the case of V.... |
| Tipo: Text |
Palavras-chave: Ultrafiltration; Biosecurisation; Pathogen retention; Sea water; OsHV-1; Shellfish production. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00634/74576/74466.pdf |
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| Cordier, Clemence; Charpin, Lisa; Stavrakakis, Christophe; Papin, Mathias; Guyomard, Killian; Sauvade, Patrick; Coelho, Franz; Moulin, Philippe. |
| Shellfish profession is jeopardized by water quality problem that concerns inlet, with the need to protect the animals from pathogens contaminations, and effluents potentially harmful for the environment with the presence of pathogens, nutrients or organic matter. In this study, ultrafiltration was tested to answer these issues. The objective of the work was two-fold: (i) treat a real effluent from an oyster breeding, the pilot had to continuously face a water containing organic matter and pathogens and (ii) use ultrafiltered water to feed an oyster spat. The process was proved to be efficient in terms of total suspended solids (TSS) and bacterial retention, and especially for Vibrio bacteria, some of whom are potentially harmful for shells. The... |
| Tipo: Text |
Palavras-chave: Ultrafiltration; Aquaculture; Shellfish effluent; Spat protection. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00478/58951/61539.pdf |
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| Cordier, Clémence; Stavrakakis, Christophe; Dupuy, Beatrice; Papin, Mathias; Sauvade, Patrick; Coelho, Franz; Moulin, Philippe. |
| Triploid oysters are favoured by the aquaculture industry because of their sterility, which results in two advantages: a faster growth than natural oysters and a constant quality throughout all the year, which is attractive for consumers. In France, these oysters are mainly produced by mating natural and tetraploid oysters whose production poses a risk for marine environmental biodiversity if biological material is released into the environment. Therefore, effluents from farms which could produce those kinds of oysters must be treated. The objective of this work was to treat shellfish hatchery effluents by ultrafiltration. The retention of gametes by the membrane, was validated for different scenario, 5 log removals were obtained, and their viability was... |
| Tipo: Text |
Palavras-chave: Ultrafiltration; Hatchery effluents; Oyster gametes removal; Marine biodiversity. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00472/58333/60886.pdf |
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| Cordier, Clémence; Voulgaris, Alexandra; Stavrakakis, Christophe; Sauvade, Patrick; Coelho, Franz; Moulin, Philippe. |
| The process of ultrafiltration (UF) of natural seawater often encounters the problems of variation in water quality and coastal blooms. To validate the feasibility of UF in shellfish farms, this study compared the hydraulic performance and pollutant removal efficiency of the UF process with those of the commonly used treatments that combine several filtration steps with UV disinfection. The comparison was conducted in the cases of natural seawater and a coastal bloom. Given that the UF process encountered this specific pollution, this study evaluated the filtration performance of the UF process and the retention of total suspended solids (TSS), bacteria, phytoplankton, and zooplankton. A real coastal bloom was considered in the case study of an... |
| Tipo: Text |
Palavras-chave: Ultrafiltration; Environmental safety; Aquaculture; Shellfish culture; Coastal bloom. |
| Ano: 2021 |
URL: https://archimer.ifremer.fr/doc/00684/79658/82422.pdf |
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