| Titre : | Assessment of the Relationships between microbial indicator levels in sediment and associated water columns in receiving waters | | Type de document : | texte imprimé | | Auteurs : | Anne-Sophie Merot ; jean-Marie Mouchel, Responsable de stage | | Editeur : | Paris : Ecole Nationale des Ponts et Chaussées (ENPC) | | Année de publication : | 1996 | | Importance : | 39 p., biblio | | Note générale : | DEA Sciences et Techniques de l'Environnement | | Langues : | Anglais (eng) | | Catégories : | Autres descripteurs
Bacterie ; MATIERE EN SUSPENSION ; EFFLUENT D'EPURATION
Thésaurus Agrovoc
Virus ; Sédimentation ; Analyse de l'eau
| | Résumé : | The constructed wetlands were shown to produce efficient removal of bacterial indicators. However, studies suggested that the indicators don't really die-off, but instead accumulate in bottom sediments. The mechanisms involved include attachment of the bacteria to suspended solids, sedimentation. They are dependent on the effluent flow. Within the sediment the bacteria can survive because they encounnter more favourable chemical and biological micro-environments. Because the inflow provides constantly additional concentrations, the sediment thus might become a reservoir of bacterial indicators and viruses. Therefore, they can constitute e health hazard by increasing the level of indicators in the outflow as the bed gets older, or whenever heavy rainfalls occur.The project consisted in settling methods in order to investigate coliform reservoirs within the wetlands sediments. Adsorption of latoratory cultures of bacteria to wetlands solids was tested in
centrifugation experiments. | | Type de document : | Mémoire | | Permalien de la notice : | https://infodoc.agroparistech.fr/index.php?lvl=notice_display&id=111050 |
Assessment of the Relationships between microbial indicator levels in sediment and associated water columns in receiving waters [texte imprimé] / Anne-Sophie Merot ; jean-Marie Mouchel, Responsable de stage . - Paris (FR) : Ecole Nationale des Ponts et Chaussées (ENPC), 1996 . - 39 p., biblio. DEA Sciences et Techniques de l'Environnement Langues : Anglais ( eng) | Catégories : | Autres descripteurs
Bacterie ; MATIERE EN SUSPENSION ; EFFLUENT D'EPURATION
Thésaurus Agrovoc
Virus ; Sédimentation ; Analyse de l'eau
| | Résumé : | The constructed wetlands were shown to produce efficient removal of bacterial indicators. However, studies suggested that the indicators don't really die-off, but instead accumulate in bottom sediments. The mechanisms involved include attachment of the bacteria to suspended solids, sedimentation. They are dependent on the effluent flow. Within the sediment the bacteria can survive because they encounnter more favourable chemical and biological micro-environments. Because the inflow provides constantly additional concentrations, the sediment thus might become a reservoir of bacterial indicators and viruses. Therefore, they can constitute e health hazard by increasing the level of indicators in the outflow as the bed gets older, or whenever heavy rainfalls occur.The project consisted in settling methods in order to investigate coliform reservoirs within the wetlands sediments. Adsorption of latoratory cultures of bacteria to wetlands solids was tested in
centrifugation experiments. | | Type de document : | Mémoire | | Permalien de la notice : | https://infodoc.agroparistech.fr/index.php?lvl=notice_display&id=111050 |
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