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Rozprawy doktorskie na temat "Déchets organiques – Recyclage – Nouvelle-Calédonie"
Klein, Perrine. "Dynamique du nickel, chrome, cuivre et zinc : du processus de compostage à l'épandage des matières fertilisantes d'origine résiduaire (MAFOR) dans des agrosystèmes de Nouvelle-Calédonie". Electronic Thesis or Diss., Nouvelle Calédonie, 2023. http://www.theses.fr/2023NCAL0004.
Pełny tekst źródłaRecycling waste-derived fertilizers (mafor) by returning them to the soil is a key practice for preserving soil organicmatter stocks while ensuring agricultural production. In New Caledonia, soils and mafor can contain high concentrationsof metallic elements (ME), notably nickel (Ni) and chromium (Cr). Copper (Cu) and zinc (Zn) are classically present inmafor. The aim of this thesis was to clarify the origin and behavior of Ni, Cr, Cu and Zn, from the production of compostfrom green waste and sewage sludge, to its use in agriculture. First, the results obtained on the compost showed thegeogenic nature of Cr and Ni, as opposed to the anthropogenic origin of Cu and Zn. The composting process doubled therapidly mobilizable Cr reservoir. Secondly, monitoring the application of compost on two contrasting soils showed thatmobilizable reservoirs depend on ME considered and soil type. Finally, the fate of available and mobilizable MEs wasstudied in an orchard with different fertilization and soil management practices. Agro-ecological practices appeared toimpact the transfer of MEs to orange trees, with facilitated uptake of (1) Ni, Cu and Zn when leguminous were cocultivated,and (2) Cr when straw was used. In the short term, the addition of compost has not resulted in any transfer of ME to the fruit. However, there is still a need for further research into the fate of MEs, with a view to establishing a local regulatory framework for the recovery of mafor
Garel, Claire. "De la phytoextraction en Nouvelle-Calédonie aux Eco-Mn : étude structurale de catalyseurs biosourcés et innovants". Thesis, Montpellier, 2017. http://www.theses.fr/2017MONTT185.
Pełny tekst źródłaMineral resources are running out, ores are hardly accessible, and ores processing damage the environment. In New-Caledonia, nickel ores mining requires to remove all the upper layers of the ground, leading to open-cast mines subjected to erosion, which threaten the environment and the biodiversity of the archipelago. Although mining ores exploitation is important for the economy of New-Caledonia, the ecological remediation of mining areas through the restoration of a vegetation cover, are necessary.ChimEco laboratory has demonstrated that it is possible to reintroduce pioneering endemic plant species, which are resistant to climate conditions and accumulate manganese, to restore New-Caledonian mining sites. These accumulating plants extract Mn from the ground to their aerial parts: it is called phytoextraction. Besides, ChimEco laboratory puts forward a new scientific and economic valorisation of phytoremediation efforts in New-Caledonia. Indeed, an innovative process has been developed to recycle metallic elements from manganese enriched biomass into innovative and polymetallic catalysts for organic synthesis. This new process is called Ecocatalysis. Ecocatalysts enriched in manganese, Eco-Mn, have demonstrated interesting and promising catalytic activities in several reactions.Regarding the good results achieved by ChimEco in ecology and in chemistry with accumulating plants and resulting Eco-Mn, it is necessary to better and precisely characterise Eco-Mn catalysts, by considering them as innovative materials, in order to understand and foresee their catalytic activity. This PhD work belongs within this context.Several analyses have been performed to characterise Eco-Mn catalysts. First, ICP-MS enables to identify metallic composition of Eco-Mn. Besides, XRD analyses highlight the presence of complex crystallized manganese salts, like K3NaMnCl6. Finally, X-ray absorption spectroscopy enables us to study the nature of manganese species which compose Eco-Mn catalysts, and to understand the oxidation states of Mn and Fe. Moreover, acid properties of Eco-Mn were demonstrated thanks to the study of a cyclic acetal rearrangement and infra-red spectroscopy of adsorbed pyridine. All these analyses were performed in order to determine first the composition of Eco-Mn catalysts, and secondly to highlight their physico-chemical properties, their oxidation state and their acid properties. Furthermore, this study also enable us to better understand the different steps of the ecocatalysts production process. Finally, synthetic catalysts were also produced and analysed in the same conditions as Eco-Mn, in order to bring out the specificities of Eco-Mn
Velayoudon, Prescilia. "Valorisation de biodéchets pour la restauration de sites dégradés de Nouvelle-Calédonie". Electronic Thesis or Diss., Nouvelle Calédonie, 2015. http://www.theses.fr/2015NCAL0004.
Pełny tekst źródłaBiowaste like biosolids or poultry can be used for organic amendment of soils. In New Caledonia, the demographic development involves an increase in waste production and the management of these ones is highly important for local authorities. On the other hand, there are numerous degraded sites issued from mining activity. In particular mining sites after exploitation, characterized by an ultramafic substratum, and industrial sites The objective of this thesis consists to bring data on biowaste valorization (sewage sludge and poultry) for degraded sites restoration. Three kind of degraded sites are selected: a not-reorganized ferralsol, a ferralsol reorganized by the mining activity and an industrial site. From these independent studies, we try to evaluate the opportunity of revegetalization from the seed bank of the original soil, or vegetalized a site free of original soil by plantations. On these 3 sites, it was followed the biometric, chemical variables of the vegetal species and chemical and physico-chemical variables of the substrata. The results are encouraging, with positive effects on plant growth. The biosolids quantity should be modulating according to the objectives to obtain between plant production and specific diversity. The low bioavailability of the ETM seems to be favorable to the biowaste manuring of these specific substrata for the rehabilitation of the degraded sites
Molnar, Nathalie. "Impact des effluents de la crevetticulture sur la dynamique de la matière organique benthique et leurs implications sur les processus biogéochimiques dans une mangrove (Nouvelle-Calédonie)". Paris, Muséum national d'histoire naturelle, 2012. http://www.theses.fr/2012MNHN0002.
Pełny tekst źródłaIn New Caledonia, the mangrove is used as a buffer zone between the shrimp farms and the lagoon, in order that the mangrove acts as a biofilter that would allow the treatment of the organic load of effluents. While the impacts of effluents on surface water in the mangroves are relatively well understood, their effects on the benthic compartment, at both geochemical and biological, remained largely unknown. The objective of this thesis was to understand the ability of the mangrove to process the effluent in its substrate. A dual problematic was defined, understanding the processes of mineralization of organic matter below different mangrove stands, and monitoring the effluent in a spatiotemporal way, using molecular and isotopic tools. Sampling was conducted during a year in order to cover the cycle of the farm, as well as seasonal variations, in two mangroves, one receiving effluents from a shrimp farm, and the other serving as control area. The MO contained in the effluent is dispersed homogeneously in the mangroves by the tides, some is deposited and is subjected to decay processes, but some is exported from the ecosystem, the mangroves cannot buffer the entire organic load. The zonation of mangrove clearly plays a key role in the natural treatment of effluents. Due to the organic nature of its substrate, and the fact that it is daily swept by tides, the Rhizophora stand appears as a zone of preferential dispersion of effluents. Its functioning does not appear altered by the effluent discharge. As for Avicennia stand, despite the amount of MO which is deposited, the substrate does not switch to anoxia due to intense bioturbation resulting from the density of crabs and the physiological activity of the root system, which are both boosted by the contribution of effluents. However, it may not be used as a discharge area because of the modification of the sedimentation and consequently of the immersion time, which governs the zonation of the ecosystem
Velayoudon, Prescilia. "Valorisation de biodéchets pour la restauration de sites dégradés de Nouvelle-Calédonie". Thesis, Nouvelle Calédonie, 2015. http://www.theses.fr/2015NCAL0004/document.
Pełny tekst źródłaBiowaste like biosolids or poultry can be used for organic amendment of soils. In New Caledonia, the demographic development involves an increase in waste production and the management of these ones is highly important for local authorities. On the other hand, there are numerous degraded sites issued from mining activity. In particular mining sites after exploitation, characterized by an ultramafic substratum, and industrial sites The objective of this thesis consists to bring data on biowaste valorization (sewage sludge and poultry) for degraded sites restoration. Three kind of degraded sites are selected: a not-reorganized ferralsol, a ferralsol reorganized by the mining activity and an industrial site. From these independent studies, we try to evaluate the opportunity of revegetalization from the seed bank of the original soil, or vegetalized a site free of original soil by plantations. On these 3 sites, it was followed the biometric, chemical variables of the vegetal species and chemical and physico-chemical variables of the substrata. The results are encouraging, with positive effects on plant growth. The biosolids quantity should be modulating according to the objectives to obtain between plant production and specific diversity. The low bioavailability of the ETM seems to be favorable to the biowaste manuring of these specific substrata for the rehabilitation of the degraded sites