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| Registros recuperados: 41 | |
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| Martins Okechukwu Isikwue; Dept of Agric & Environmental Engineering, University of Agriculture, Makurdi, Nigeria; Jeremiah A. Ato; Dept of Agric & Environmental Engineering, Univ. of Agric Makurdi; Isaac T. Ayua; Agric. & Environmental Engineering, Univ. of Agriculture Makurdi. |
| An affordable potable water treatment unit was designed and constructed. The components were coagulation unit, sedimentation unit, slow sand filter unit, utraviolet unit and the storage unit. Filtrate from the chamber was compared with International acceptable standards. The result showed that the treatment chamber proved effective and can produce at least 100 litres of portable water per day. The physical and chemical parameters monitored were reduced to the acceptable limit by WHO (World Health Organisation), NAFDAC(National Agency for Food and Drug Administration and Control) Nigeria and Nigerian Standard for Drinking Water Quality (NSDWQ). However, coliform was not totally removed but the count was reduced by 99.4%. |
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Palavras-chave: Land and Water Management; Water Quality; Raw water; Filtration; Treatment; Potable water; Domestic usage. |
| Ano: 2015 |
URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2872 |
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| Bello,Antonio Roberto Crystal; Angelis,Dejanira de Franceschi; Domingos,Roberto Naves. |
| Processes like ultrasound, chlorination and filtration-adsorption were compared to eliminate microorganisms and to adjust established parameters of public drinking water. A mini water treatment plant (WTP-CB), in pilot scale, was projected and built to evaluate each process influence as: decontamination, coagulation-flocculation, sedimentation and filtration. Total and fecal coliforms, Escherichia coli and heterotrophic bacteria and physic/chemical parameters were quantified from water. Ultrasound, chlorination and filtration-adsorption were efficient to inactivate and/or eliminate bacteria. Ultrasound decontamination in addition to coagulation-flocculation, sedimentation and filtration, could be considered as an alternative treatment water solution where... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Water; Filtration; Microorganisms; Ultrasound; Chlorination. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132005000600009 |
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| Haure, Joel; Baud, Jean-pierre; Bougrier, Serge. |
| Introducing new species for shellfish farming is essential for expanding farmers' markets and for minimising the pathological risks that endangers professional marine aquaculture activities, which traditionally rely on only one species. Ifremer's Aquaculture and Pathological Genetics (GAP) laboratory participates in the mollusc genetics network (REGEMO). Since 1989, this network has been carrying out a selection programme for resistance or tolerance to Bonamia ostreae in European flat oysters (Ostrea edulis) to revitalize cultivation of this species on a national level. |
| Tipo: Text |
Palavras-chave: Température; Oxygène; Filtration; Ostrea edulis; Allométrie. |
| Ano: 1997 |
URL: http://archimer.ifremer.fr/doc/1997/acte-3254.pdf |
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| Waeles, Mathieu; Cotte, Laura; Pernet-coudrier, Benoit; Chavagnac, V.; Cathalot, Cecile; Leleu, T.; Laes-huon, Agathe; Perhirin, Antoine; Riso, R. D.; Sarradin, Pierre-marie. |
| Deep-sea hydrothermal venting is now recognized as a major source of iron (Fe), an essential trace element that controls marine productivity. However, the reactions occurring during dispersal from buoyant plumes to neutrally buoyant hydrothermal plumes are still poorly constrained. Here we report for the first time on the dissolved-particulate partition of Fe after in situ filtration at the early stage of mixing at different hydrothermal discharges, i.e., Lucky Strike (37 degrees N), TAG (26 degrees N), and Snakepit (23 degrees N) on the Mid-Atlantic Ridge. We found that hydrothermal iron is almost completely preserved (>90%) in the dissolved fraction, arguing for low iron-bearing sulfide precipitation of iron in basalt-hosted systems with low Fe:H2S... |
| Tipo: Text |
Palavras-chave: Hydrothermal; Iron; Sulfide; Venting; Filtration; Precipitation. |
| Ano: 2017 |
URL: https://archimer.ifremer.fr/doc/00388/49944/50522.pdf |
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| Raillard, Olivier; Soletchnik, Patrick; Heral, Maurice; Prou, Jean; Bougrier, Serge; Razet, Daniel; Geairon, Philippe; Barille, Laurent; Guezennec, Loïc. |
| Les expérimentations on continu sur le site du Chapus au centre du bassin de Marennes-Oléron pendant le mois de mai 1991 et d'octobre 1991 ont permis de préciser la filtration des huîtres en fonction de la variabilité de la charge particulaire. Ces nouveaux résultats permettent d'affiner les modèles de croissance des huîtres. Un nouveau modèle de croissance phytoplanctonique permet de démontrer la sensibilité du bassin de Marennes-Oléron aux apports de nitrates provenant de la Charente, et leur impact sur la croissance des huîtres. L'étude des caractéristiques mécaniques des vases et des biodépôts ainsi que l'étude de l'agitation (houle et clapots, permet de modifier et de préciser les formulations d'un nouveau modèle de transport particulaire représentant... |
| Tipo: Text |
Palavras-chave: Séries en continu; Filtration; Crassostrea gigas; Modèle phytoplanctonique; Sédiment; Modèle de transport particulaire; Bassin de Marennes Oléron. |
| Ano: 1992 |
URL: http://archimer.ifremer.fr/doc/00048/15907/13335.pdf |
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| His, Edouard. |
| L'introduction d'une nouvelle espèce en ostréiculture donne souvent lieu à des débats passionnés dans les milieux ostréicoles. Un exemple est donné par Charles Martin, parqueur du Bassin d'Arcachon, dans son ouvrage "Agriculteur de la mer"; il rapporte les mesures restrictives qu'avait entraînées l'introduction de l'huître portugaise à Arcachon au début du 20ème siècle. Un des arguments avancés pour expliquer les réticences était celui de la "concurrence vitale" et de la compétition sur le plan nutritionnel (filtration) entre C. angulata et Ostrea edulis: cette dernière espèce était alors seule exploitée dans le bassin. Il fallut attendre l'épizootie de 1920, qui anéantit presque totalement l'huître plate, pour que la portugaise soit définitivement admise. |
| Tipo: Text |
Palavras-chave: Ostréiculture; Crassostrea gigas; Crassostrea angulata; Filtration; Bassin Arcachon; Gironde. |
| Ano: 1970 |
URL: http://archimer.ifremer.fr/doc/00009/11978/8682.pdf |
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| Lotfi-kalahroodi, Elaheh; Pierson-wickmann, Anne-catherine; Guénet, Hélène; Rouxel, Olivier; Ponzevera, Emmanuel; Bouhnik-lecoz, Martine; Vantelon, Delphine; Dia, Aliou; Davranche, Mélanie. |
| Colloids have been recognized as key vectors of pollutants in aqueous environment. Amongst them, those formed by iron (Fe) and organic matter (OM) are of major importance due to their ubiquity in the surface environment and strong affinity for metals. In the recent years, Fe stable isotopes have been increasingly used to elucidate the sources and biogeochemical cycling of Fe in Earth's surface environments. In this study, we aim to elucidate (i) the possible Fe isotopic signature resulting from the Fe/OM colloid formation and (ii) the mechanisms involved in the development of such isotopic signature. For this purpose, Fe-OM associations were synthesized through binding and titration experiments. Various pH levels were used in order to study the isotope... |
| Tipo: Text |
Palavras-chave: Filtration; Size fractionation; Isotope fractionation; Colloidal; Dissolved; Fe isotopes. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00480/59174/61811.pdf |
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| Soletchnik, Patrick; Heral, Maurice; Razet, Daniel; Bougrier, Serge; Geairon, Philippe. |
| Ecophysiological study was conducted on the japanese oyster (Crassostrea gigas) reared in Marennes-Oléron bay (France), during May 1992. Most of the somatic growth of the oyster occured during that month. The measurements were achieved from a removable laboratory stated in Le Chapus for 3 days at different tide level (coefficient of 49, 57, and 88). The food conditions were monitored through a computer with a continuous record of the turbidity during aIl the tidal cycle. In spite of an important variation between the food conditions in mean seston load, from 13,5 to 54,6 mg/!, the available organic matter ranged from 3 to 4,9 mg/l. The rate of organic matter in the water ranged 22 % to 9 %. The organic selection efficiency was significantly higher for the... |
| Tipo: Text |
Palavras-chave: Energetic budget; Selection efficiency; Filtration; Crassostrea gigas; Budget énergétique; Sélection; Consommation; Crassostrea gigas. |
| Ano: 1993 |
URL: http://archimer.ifremer.fr/doc/1993/acte-3068.pdf |
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| Pernet, Fabrice; Lugue, Klervi; Petton, Bruno. |
| Competition between organisms interfere in host and pathogen dynamics in ways that are difficult to predict. By one side, competitors can reduce the food supply and cause nutritional stress. Such stress could further modulate the susceptibility to infection by altering immune response or metabolic rate of the host. Alternatively, competitors may trap pathogens before they reach the focal host, and therefore reduce, enhance, or have no effect on infection according to the competitor's susceptibility to the infection. To better understand how competition influences host and pathogen interactions, we experimentally assessed the relative importance of competition for pathogens and resources on the severity of a viral disease infecting the Pacific oyster... |
| Tipo: Text |
Palavras-chave: Competition; Crassostrea gigas; Disease ecology; Filtration; Ostreid herpesvirus 1; Pathogen. |
| Ano: 2021 |
URL: https://archimer.ifremer.fr/doc/00692/80375/83493.pdf |
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| Fouche, Dominique; Boiron, Philippe. |
| On constate actuellement une profusion d'appareils d'aération en vente sur le marché. En même temps, il apparaît nécessaire pour les professionnels de la conchyliculture de s'équiper convenablement pour éviter l'apparition de mortalités en bassins de finition. Ceci impose donc la mise en place de suivis d'efficacité des différents systèmes utilisés, dans les conditions de travail de la profession en ce qui concerne le stockage des mollusques bivalves. Les premiers résultats permettent de classer quatre systèmes en terme d'efficacité, mais ne permettent pas encore de proposer des rythmes d'utilisation journaliers en toutes saisons. D'autres études en cours répondront à ce problème. Des résultats des mesures effectuées sur l'eau et sur les mollusques, il se... |
| Tipo: Text |
Palavras-chave: Aérateurs; Crassostrea gigas; Bassin de finition; Respiration; Filtration. |
| Ano: 1992 |
URL: http://archimer.ifremer.fr/doc/00423/53401/54273.pdf |
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| Registros recuperados: 41 | |
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