Dépouillements

Reed bed systems for sludge treatment: case studies in Italy / G. Masciandaro in Water Science and Technology, Vol. 72 n° 7 (du 1 octobre au 14 octobre 2015)

Public ISBD [article]  in Water Science and Technology > Vol. 72 n° 7 (du 1 octobre au 14 octobre 2015) . - 1043-1050 Titre : Reed bed systems for sludge treatment: case studies in Italy Type de document : texte imprimé Auteurs : G. Masciandaro, Auteur ; R. Iannelli, Auteur ; M. Chiarugi, Auteur ; E. Peruzzi, Auteur Année de publication : 2015 Article en page(s) : 1043-1050 Langues : Anglais (eng) Catégories : RAMEAU Boues d'épuration ; Métaux lourds -- Aspect de l'environnement Thésaurus Agrovoc Pollution de l'eau Résumé : In recent years, reed bed systems (RBSs) have been widely considered as a valid technology for sludge treatment. In this study are presented results about sludge stabilization occurring within beds in four RBSs, situated in Tuscany (Italy). The results showed that stabilization of the sludge over time occurred in all RBSs, as shown by the low content of water-soluble carbon and dehydrogenase activity, which measures indirectly the overall microbial metabolism, and by the re-synthesis of humic-like matter highlighted by the pyrolytic indices of mineralization and humification. Results about heavy metal fractionation, an appropriate technique to estimate the heavy metal bioavailability and sludge biotoxicity, showed that the process of sludge stabilization occurring in RBSs retains metals in fractions related to the stabilized organic matter, making metals less bioavailable. Moreover, the concentrations of various toxic organic compounds were below the limit of concentration suggested by the European Union's Working Document on Sludge, for land application. The effectiveness of the stabilization processes in RBs was hence clearly proven by the results that measured mineralization and humification processes, and by the low levels of bioavailable heavy metals and toxic organic compounds in stabilized sludges. Type de document : Article Permalien de la notice : https://infodoc.agroparistech.fr/index.php?lvl=notice_display&id=182479 [article] Reed bed systems for sludge treatment: case studies in Italy [texte imprimé] / G. Masciandaro, Auteur ; R. Iannelli, Auteur ; M. Chiarugi, Auteur ; E. Peruzzi, Auteur . - 2015 . - 1043-1050. Langues : Anglais (eng) in Water Science and Technology > Vol. 72 n° 7 (du 1 octobre au 14 octobre 2015) . - 1043-1050 Catégories : RAMEAU Boues d'épuration ; Métaux lourds -- Aspect de l'environnement Thésaurus Agrovoc Pollution de l'eau Résumé : In recent years, reed bed systems (RBSs) have been widely considered as a valid technology for sludge treatment. In this study are presented results about sludge stabilization occurring within beds in four RBSs, situated in Tuscany (Italy). The results showed that stabilization of the sludge over time occurred in all RBSs, as shown by the low content of water-soluble carbon and dehydrogenase activity, which measures indirectly the overall microbial metabolism, and by the re-synthesis of humic-like matter highlighted by the pyrolytic indices of mineralization and humification. Results about heavy metal fractionation, an appropriate technique to estimate the heavy metal bioavailability and sludge biotoxicity, showed that the process of sludge stabilization occurring in RBSs retains metals in fractions related to the stabilized organic matter, making metals less bioavailable. Moreover, the concentrations of various toxic organic compounds were below the limit of concentration suggested by the European Union's Working Document on Sludge, for land application. The effectiveness of the stabilization processes in RBs was hence clearly proven by the results that measured mineralization and humification processes, and by the low levels of bioavailable heavy metals and toxic organic compounds in stabilized sludges. Type de document : Article Permalien de la notice : https://infodoc.agroparistech.fr/index.php?lvl=notice_display&id=182479

Catchment delineation and morphometric analysis using geographical information system / Manoj Kumar in Water Science and Technology, Vol. 72 n° 7 (du 1 octobre au 14 octobre 2015)

Public ISBD [article]  in Water Science and Technology > Vol. 72 n° 7 (du 1 octobre au 14 octobre 2015) . - 1168-1175 Titre : Catchment delineation and morphometric analysis using geographical information system Type de document : texte imprimé Auteurs : Manoj Kumar, Auteur ; Rohitashw Kumar, Auteur ; P.K. Singh, Auteur ; Manjeet Singh, Auteur ; K.K. Yadav, Auteur ; H.K. Mittal, Auteur Année de publication : 2015 Article en page(s) : 1168-1175 Langues : Anglais (eng) Catégories : Thésaurus Agrovoc Système d'information géographique ; Bassin versant ; Hydrologie Résumé : The geographical information system (GIS) has emerged as an efficient tool in delineation of drainage patterns of watershed planning and management. The morphometric parameters of basins can address linear, areal and relief aspects. The study deals with the integrated watershed management of Baliya micro-watersheds, located in the Udaipur district of Rajasthan, India. Morphometric analysis in hydrological investigation is an important aspect and it is inevitable in the development and management of drainage basins. The determination of linear, areal and relief parameters indicate fairly good significance. The low value of the bifurcation ratio of 4.19 revealed that the drainage pattern has not been distorted by structural disturbance. The high value of the elongation ratio (0.68) compared to the circulatory ratio (0.27) indicates an elongated shape of the watershed. The high value of drainage density (5.39 km/km2) and stream frequency (12.32) shows that the region has impermeable subsoil material under poor vegetative cover with a low relief factor. The morphometric parameters of relief ratio (0.041) and relative relief (0.99%) show that the watershed can be treated using GIS techniques to determine the morphometric presence of dendritic drainage pattern, with a view to selecting the soil and water conservation measures and water harvesting. Type de document : Article Permalien de la notice : https://infodoc.agroparistech.fr/index.php?lvl=notice_display&id=182480 [article] Catchment delineation and morphometric analysis using geographical information system [texte imprimé] / Manoj Kumar, Auteur ; Rohitashw Kumar, Auteur ; P.K. Singh, Auteur ; Manjeet Singh, Auteur ; K.K. Yadav, Auteur ; H.K. Mittal, Auteur . - 2015 . - 1168-1175. Langues : Anglais (eng) in Water Science and Technology > Vol. 72 n° 7 (du 1 octobre au 14 octobre 2015) . - 1168-1175 Catégories : Thésaurus Agrovoc Système d'information géographique ; Bassin versant ; Hydrologie Résumé : The geographical information system (GIS) has emerged as an efficient tool in delineation of drainage patterns of watershed planning and management. The morphometric parameters of basins can address linear, areal and relief aspects. The study deals with the integrated watershed management of Baliya micro-watersheds, located in the Udaipur district of Rajasthan, India. Morphometric analysis in hydrological investigation is an important aspect and it is inevitable in the development and management of drainage basins. The determination of linear, areal and relief parameters indicate fairly good significance. The low value of the bifurcation ratio of 4.19 revealed that the drainage pattern has not been distorted by structural disturbance. The high value of the elongation ratio (0.68) compared to the circulatory ratio (0.27) indicates an elongated shape of the watershed. The high value of drainage density (5.39 km/km2) and stream frequency (12.32) shows that the region has impermeable subsoil material under poor vegetative cover with a low relief factor. The morphometric parameters of relief ratio (0.041) and relative relief (0.99%) show that the watershed can be treated using GIS techniques to determine the morphometric presence of dendritic drainage pattern, with a view to selecting the soil and water conservation measures and water harvesting. Type de document : Article Permalien de la notice : https://infodoc.agroparistech.fr/index.php?lvl=notice_display&id=182480

Cause and effect oriented sewer degradation evaluation to support scheduled inspection planning / D. Fuchs-Hanusch in Water Science and Technology, Vol. 72 n° 7 (du 1 octobre au 14 octobre 2015)

Public ISBD [article]  in Water Science and Technology > Vol. 72 n° 7 (du 1 octobre au 14 octobre 2015) . - 1176-1183 Titre : Cause and effect oriented sewer degradation evaluation to support scheduled inspection planning Type de document : texte imprimé Auteurs : D. Fuchs-Hanusch, Auteur ; M. Günther, Auteur ; M. Möderl, Auteur ; D. Muschalla, Auteur Année de publication : 2015 Article en page(s) : 1176-1183 Langues : Anglais (eng) Catégories : RAMEAU Eaux souterraines ; Égouts ; Services publics Thésaurus Agrovoc Traitement des eaux usées Résumé : Managing the subsurface urban infrastructure, while facing limited budgets, is one of the main challenges wastewater utilities currently face. In this context targeted planning of inspection and maintenance measures plays a crucial role. This paper introduces a cause and effect oriented sewer degradation evaluation approach to support decisions on inspection frequencies and priorities. Therefore, the application of logistic regression models, to predict the probability of failure categories as an alternative to the prediction of sewer condition classes, was introduced. We assume that analysing the negative effects resulting from different failure categories in extension to a condition class-based planning approach offers new possibilities for targeted inspection planning. In addition, a cross validation process was described to allow for a more accurate prediction of sewer degradation. The described approach was applied to an Austrian sewer system. The results show that the failure category-based regression models perform better than the conventional condition class-oriented models. The results of the failure category predictions are presented with respect to negative effects the failure may have on the hydraulic performance of the system. Finally, suggestions are given for how this performance-oriented sewer section evaluation can support scheduled inspection planning. Type de document : Article Permalien de la notice : https://infodoc.agroparistech.fr/index.php?lvl=notice_display&id=182481 [article] Cause and effect oriented sewer degradation evaluation to support scheduled inspection planning [texte imprimé] / D. Fuchs-Hanusch, Auteur ; M. Günther, Auteur ; M. Möderl, Auteur ; D. Muschalla, Auteur . - 2015 . - 1176-1183. Langues : Anglais (eng) in Water Science and Technology > Vol. 72 n° 7 (du 1 octobre au 14 octobre 2015) . - 1176-1183 Catégories : RAMEAU Eaux souterraines ; Égouts ; Services publics Thésaurus Agrovoc Traitement des eaux usées Résumé : Managing the subsurface urban infrastructure, while facing limited budgets, is one of the main challenges wastewater utilities currently face. In this context targeted planning of inspection and maintenance measures plays a crucial role. This paper introduces a cause and effect oriented sewer degradation evaluation approach to support decisions on inspection frequencies and priorities. Therefore, the application of logistic regression models, to predict the probability of failure categories as an alternative to the prediction of sewer condition classes, was introduced. We assume that analysing the negative effects resulting from different failure categories in extension to a condition class-based planning approach offers new possibilities for targeted inspection planning. In addition, a cross validation process was described to allow for a more accurate prediction of sewer degradation. The described approach was applied to an Austrian sewer system. The results show that the failure category-based regression models perform better than the conventional condition class-oriented models. The results of the failure category predictions are presented with respect to negative effects the failure may have on the hydraulic performance of the system. Finally, suggestions are given for how this performance-oriented sewer section evaluation can support scheduled inspection planning. Type de document : Article Permalien de la notice : https://infodoc.agroparistech.fr/index.php?lvl=notice_display&id=182481