Search results for "déchet"
showing 10 items of 13 documents
Chemical and dimensional evolution of cationic ions exchange resins in cement pastes
2013
Ion exchange resins (IERs) are widely used by the nuclear industry to decontaminate radioactive effluents. After use they are usually encapsulated in cementitious materials. However, the solidified waste forms can exhibit a strong expansion, possibly leading to cracking. Its origin is not well understood as well as the conditions when it occurs.In this work, the interactions between cationic resins in the Na+ or Ca2+ form and tricalcium silicate (C3S), Portland cement (CEM I) or Blastfurnace slag cement (CEM III/C) are investigated at an early age in order to gain a better understanding of the expansion process.The results show that during the hydration of a paste of C3S or CEM I containing…
Revelation of aroma potential of grape pomace and spent coffee ground by the use of microbial glycosidases.
2021
The food industry is evolving and tends to reduce its environmental impact, to control its waste and to valorise all of its production. Grapes and coffee are among the main agricultural products in the world and not all of the byproducts resulting from their processing are still valued today. New ways of valorisation are seeked in order to limit production losses. Yet, these byproducts are rich in glycosides, the amount of which may be from two to five times greater than that of the free volatile compounds. Grape pomace and spent coffee ground could be used to naturally produce volatile compounds from their glycosides. These volatile compounds could be useful in the production of cosmetics,…
La microbiologie moléculaire environnementale : historique, limites et potentialités
2017
prod 2017-237c INRA EA BIOmE; Résumé de la brochure : Dans une société où il devient urgent de réduire l'empreinte environnementale des activités humaines, la première étape est de pouvoir faire un diagnostic de la qualité de notre environnement et des différentes matrices le constituant (eau, sol, atmosphère, déchets). Les microorganismes, de par leur petite taille, leur énorme diversité taxonomique et génétique, leur réactivité aux perturbations ainsi que par leur forte implication dans les cycles biogéochimiques gérant les flux de matière et d'énergie, sont des candidats incontournables pour élaborer ce diagnostic. Ceci est d'autant plus vrai que depuis une vingtaine d'années les fortes …
Développement d'un procédé électrochimique pour le recyclage du néodyme à partir de déchets électroniques
2018
Neodymium belongs to the lanthanide’s serie of the period system and is the key component of the permanent magnets Nd2Fe14B which are implemented in electronic devices and “green” technologies like wind turbines or electric cars and bicycles. Nowadays, only one percent of the neodymium in electronic scraps is recycled. Due to the geopolitical considerations and a strong increase of the use of permanent magnets, there is an impoverishment of the raw material resources leading to an instable market.Since some decades, few recycling processes have been developed on a lab scale without any upscaling to the industrial scale. The existing processes have several drawbacks like multiple steps to ob…
Co-production of Hydrogen and Methane From the Organic Fraction of Municipal Solid Waste in a Pilot Scale Dark Fermenter and Methanogenic Biofilm Rea…
2018
The co-production of biohydrogen and methane from the organic fraction of municipal solid waste was investigated using a two-stage AD system, composed of a pilot scale dark fermenter (DF) and a continuous methanogenic biofilm reactor. From the DF process, a biohydrogen yield of 41.7 (± 2.3) ml H2/gVSadded was achieved. The liquid DF effluent (DFE) was rich in short chain volatile fatty acids, i.e., mainly acetic and butyric acid. The DFE was valorized by producing methane in the methanogenic biofilm reactor. Two methanogenic biofilm reactors were used to assess the biotic and abiotic role of the DFE on the performance of the reactors. Regardless of the different DFE feeding (i.e., biotic an…
Elaboration et caractérisation d’une structure composite (sable et déchets plastiques recyclés) : Amélioration de la résistance par des charges en ar…
2018
This project aims at conceiving(designing) one paves with plastic waste got back in the discharges and with mixture of sand and gravel. This pavement that must be of use to the realization of pavements and public highways, must thus be capable of answering the technical conditions of its use. However, the fabrication method and the used material(equipment) must be rather simple to allow its fast handling by little qualified workers and a low(weak) production cost to be economically competitive. Pavements will thus be tested to identify their performance at the same time mechanical and physical then used on life-size to understand(include) their ageing because of their wear. Finally, an equi…
Apport de matières organiques exogènes en agriculture: indicateur de potentialité de stockage de carbone dans les sols et définition de classes de di…
2007
CT3; absent
Are control of extracellular acid-base balance and regulation of skeleton genes linked to resistance to ocean acidification in adult sea urchins?
2020
SCOPUS: ar.j
Soil DNA evidence for altered microbial diversity after long-term application of municipal wastewater
2010
International audience; Water resources constitute a social, agricultural and economic problem in most countries of the southern Mediterranean Basin. Alternative strategies have been developed such as the reuse of municipal wastewater for irrigation in agriculture. Despite numerous advantages for soil fertility and crop productivity, recycling wastewater in soils also has several ecotoxicological and sanitary problems. Few investigations have assessed the risk by evaluating the impact of wastewater irrigation on soil microbes. Here, we report for the first time the short- and long-term effects of treated municipal wastewater irrigation on the density and genetic structure of bacterial and f…
La microbiologie moléculaire au service du diagnostic environnemental
2017
Ouvrage de vulgarisation professionnelle INRA EA BIOmE; National audience; Dans une société où il devient urgent de réduire l'empreinte environnementale des activités humaines, la première étape est de pouvoir faire un diagnostic de la qualité de notre environnement et des différentes matrices le constituant (eau, sol, atmosphère, déchets). Les microorganismes, de par leur petite taille, leur énorme diversité taxonomique et génétique, leur réactivité aux perturbations ainsi que par leur forte implication dans les cycles biogéochimiques gérant les flux de matière et d'énergie, sont des candidats incontournables pour élaborer ce diagnostic. Ceci est d'autant plus vrai que depuis une vingtaine…