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Academic literature on the topic 'Co-Produits végétaux'
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Journal articles on the topic "Co-Produits végétaux"
KANOUO DJOUSSE, Boris Merlain, Cybelle Francine Djiokeng Nguiffo, Martin Lekeufack, Edna Buhnyuy Visiy, Sibelle Mouaffo Tsague, and Giles Raoul Meli Lontsi. "Potential of biochars from agricultural residues in domestic wastewater treatment using vertical flow filters vegetated with Echinochloa pyramidalis." Environnement, Ingénierie & Développement Vol. 88 EID (November 13, 2023). http://dx.doi.org/10.46298/eid.2023.11095.
Full textDUMONT, Bertrand, Marc BENOIT, Sophie CHAUVAT, Sylvie COURNUT, Guillaume MARTIN, Pierre MISCHLER, and Marie-Angelina MAGNE. "Durabilité des exploitations d'élevage multi-espèces en France et en Europe : bénéfices observés, freins et leviers pour leur déploiement." INRAE Productions Animales 36, no. 1 (May 5, 2023). http://dx.doi.org/10.20870/productions-animales.2023.36.1.7516.
Full textDissertations / Theses on the topic "Co-Produits végétaux"
Hollestelle, Charlotte. "Valorisation de co-produits végétaux de l'industrie agro-alimentaire pour la stabilisation d'émulsions Clean-Label." Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASB007.
Full textThe valorization of vegetal by-products from the agri-food industry, in the form of crude powders (untouched by chemical modification), offers a promising alternative to conventional emulsifiers, aligning with the increasing consumer demand for Clean-Label products while advancing sustainability goals to reduce food waste. This study aims to investigate and assess the potential of vegetal by-product powders as a renewable source of unprocessed ingredients for stabilizing emulsions. The evaluation process involves three main phases: 1) initial screening to identify three co-products representing major biomass categories; 2) Multi-scale mechanistic study of emulsion stabilization mechanisms by vegetal powders with a focus on the structuring of hybrid oil-water interfaces; and 3) a multi-criteria modeling approach to correlate desired emulsion properties with key formulation and processing parameters. The findings underscore the inherent synergy between soluble and insoluble fractions, emphasizing the significance of valorizing by-products in their unprocessed state. Hypotheses regarding emulsion structuring were proposed after decoupling and quantifying the effects of composition and process factors. Formulation aid tools were developed to design tailor-made emulsions using a reverse engineering approach. The thesis introduces a unique method of heterogeneity engineering to promote the sustainable use of unrefined ingredients for emulsion stabilization
Galvan, D'Alessandro Leandro. "Eco-procédés pour la récupération sélective d’antioxydants à partir d’Aronia melanocarpa et ses co-produits." Thesis, Lille 1, 2013. http://www.theses.fr/2013LIL10134/document.
Full textThe Black Chokeberry fruits are one of the richest sources in phenolic antioxidant compounds, particularly in anthocyanins. The influence of the main operating parameters on the kinetics and yields of anthocyanins and total polyphenols extraction with ultrasound assistance was studied. The extraction kinetics was described by equations based on the Peleg’s model. The development of a global model (including time, temperature, solvent composition and ultrasound power) was proposed as a tool for optimizing the conditions of antioxidants extraction. After preliminary studies of on extract enrichment using different solid supports, Amberlite XAD7HP macroporous resins was chosen as the most suitable for the adsorption of antioxidants molecules from aronia. Finally, a new ecological integrated extraction-adsorption process was proposed for the selective recovery of antioxidant molecules. This process enabled to extract antioxidant substances and to simultaneously purify the extracts, which led to enrichments by more than 15 times of anthocyanins content in the extracts. Process feasibility on a semi-pilot scale of this new integrated process was demonstrated
Tabet, Karim. "Valorisation de co-produits agro-industriels pour la production de charbons actifs végétaux : Applications à la décoloration de sirops de sucres et au traitement des eaux." Compiègne, 2003. http://www.theses.fr/2003COMP1481.
Full textThe main objective of this work is the valorization and the minimization of agro-industrial byproducts of straw and bran for the manufacture of activated carbon (AC). After a lab-scale optimization allowing the selection of the activation/carbonization parameters, we have produced effective AC and specified the influence of the operating conditions on their porous structure. We used TGA to establish the role of the chemical agent in the development of porosity. While manufactliring AC in a pilot scale furnace, we established that the pyrolysis gases are essential to obtain well-developed porosity AC, and showed that CO2 is directly responsible for the development of porosity. Lastly, we established that sugar decolorization depends on the volume of the mesopores ranging between 4 nm and 12 Dm. By testing our AC in water treatment, we showed that the pesticides adsorption capacities are related to the microporous volume
Bruniaux, Pauline. "Développement de nouveaux ingrédients santé issus de la fermentation de coproduits de la filière chicorée." Electronic Thesis or Diss., Université de Lille (2022-....), 2024. http://www.theses.fr/2024ULILR062.
Full textChicories (Cichorium intybus), such as endive and industrial chicory, are primarily cultivated in the Hauts-de-France region. These plants offer numerous health benefits, including antidiabetic, anti-inflammatory, hepatoprotective, antioxidant, and prebiotic properties. These activities are attributed to compounds such as inulin, polyphenols, and sesquiterpene lactones. Chicory production generates over 400,000 tons of co-products annually, which are usually intended for animal feed. To better valorize these co-products, lactic fermentation presents an interesting approach. Indeed, lactic acid bacteria possess enzymes capable of degrading plant matrices, thereby improving their bioactivities. The aim of this doctoral project is to develop a health ingredient from the lactic fermentation of chicory co-products. The first axis focused on developing a fermentation process for chicory co-products using Lactobacillus strains from the VF Bioscience collection or from the endive microbiota. The strain/co-product combinations, fermentation conditions, and optimization of Lactobacillus growth were studied. Additionally, the antioxidant, hepatoprotective, and anti-inflammatory activities of the fermentation products were evaluated through biochemical and cellular assays. The second axis focused on studying the impact of gastrointestinal digestion and the passage through the intestinal barrier on the activities of the fermentation products, as well as their characterization at each stage of the process. To do this, the fermentation products were digested in vitro and exposed to a co-culture of Caco-2 and HT29-MTX cells grown on inserts to simulate the intestinal barrier. Antioxidant, hepatoprotective, and anti-inflammatory activities were then evaluated on various cell lines. This project demonstrated that the lactic fermentation of chicory co-products enhances some of their bioactivities and that these activities are minimally affected by gastrointestinal digestion
Yammine, Sami. "Extraction des molécules à haute valeur ajoutée par eau sous critique et fractionnement par procédés membranaires : Valorisation des co-produits de la vigne et du vin par des procédés éco-innovants." Thesis, Bordeaux, 2016. http://www.theses.fr/2016BORD0056/document.
Full textThis work has dealt with extraction of natural substances from winery by-products using "green" processes such as extraction by subcritical water and purification by membrane processes. These processes are an alternative to solvent extraction traditionally used in the natural products industry. Main part of the work was done on different grape pomace, extraction was optimized and compared in terms of yield, chemical composition, and antioxidant activity of extracts. Dunkelfelder extracts exhibited the strongest antioxidant activity and comparison of chemical compositions of the different extracts indicated. Furthermore this Dunkelfelder grape pomace was used as model in order to optimize the different process parameters such as temperature, pressure and hydraulic retention time. After the subcritical water extraction, extracts produced were found to be rich in several families of molecules. An essential purification step of target compounds prior to industrial use was indispensable. Coupling the subcritical water with membrane processes offers an innovative solution for the purification of these extracts. Thereby, the extract was assayed in a cross-flow apparatus against eleven membranes of ultrafiltration (100 to 2 kDa) and nine membranes of nanofiltration (1000 to 150 Da). The monitoring of the process was carried out by determining performance parameters and retention coefficients of different families of macro and micromolecules. The results obtained have demonstrated that the use of membrane technologies could bring innovative changes in the recovery of bioactive compounds for future industries
Bouchikhi, Aurélie. "Contribution à la formulation d’un béton végétal structurel à base cimentaire incorporant des co-produits / déchets de bois." Thesis, Ecole nationale supérieure Mines-Télécom Lille Douai, 2019. http://www.theses.fr/2019MTLD0009.
Full textThe construction industry produces a high amount of greenhouse gases. In order to reduce the impact of materials on the environment, a lot of researches are focused on the study of different alternatives to limit the exhaustion of resources, the energy consumption and the rejection of polluting compounds. In this context, bio-based concrete seem to be a serious alternative to traditional concrete, with a lower carbon footprint.The aim of this industrial thesis, supported by the company ALKERN, leader in France and in Belgium for precast concrete products, is to contribute to the formulation of structural green concrete incorporating co-products / wood waste with an environmental impact lower than the Naturbloc®, a block already available on the market. This last product is made of wood aggregates mineralized and then introduced in a cementitious matrix.This work is divided into three parts. Firstly, the control wood (untreated) and reference wood (mineralized) were characterized. Then, alternative treatments to replace cement coating of wood were tested and characterized, especially in terms of water uptake and ability to leach or hold the extractives present in vegetables back. Their compatibility with a cementitious matrix was also evaluated. The study highlights the fact that the nature of the substrate has an influence on the results and on the interaction between aggregates and cementitious paste.Finally, treated wood was introduced into a cementitious matrix and in an alternative matrix with a lower environmental impact. The latter was obtained either by change of the binder or by use of additives in bio-based concrete. All the results show the existence of a direct link between physico-chemical properties of aggregates and mechanical performances of concrete
Brouard, Yoann. "Caractérisation et optimisation d'un composite biosource pour l'habitat." Thesis, Tours, 2018. http://www.theses.fr/2018TOUR4024.
Full textThe purpose of this study was to compare hygrothermal acoustical and mechanical properties ot different materials based on vegetal aggregates and clay in order to characterize the performances of different biocomposites to provide building insulation solutions with a view to valorizing agricultural waste. We first analyzed the raw materials in order to get the density, thermal and hydric properties of the vegetal aggregates in one hand and the mineralogy and gravimetric data of the selected crude earth in the other hand. Thermal behavior of earth:vegetal aggregates mixes have been investigated at different humidity rates and different density ranges. Additionally, hydric properties have been measured to produce sorption and desorption curves and moisture buffer values (MBV) in one hand and capillarity of both aggregates and biocomposites on the other hand. One of the main interests of this study is to confirm that a wide range of locally produced vegetal byproducts could be used as - bioaggregates for concretes. Local biomaterials industries could therefore emerge depending on the locally available resources at country scale
Rosa, Latapie Séverine. "Modélisation et optimisation des performances thermiques des matériaux bio et géosourcés par approche multi-échelle : apport à la valorisation d'une large gamme de co-produits agricoles." Electronic Thesis or Diss., Université de Toulouse (2023-....), 2024. http://www.theses.fr/2024TLSES152.
Full textThe challenges of the 21st century require energy and environmental issues to be central concerns for society. The building sector, one of the most environmentally-impacting, must seize this opportunity to ensure a rapid, relevant and sustainable transition. The use of bio- and geo-based building materials allows improvements in indoor comfort and energy efficiency to be achieved, while reducing the building environmental impact. Hemp concrete is a promising alternative which has been developing for several years. However, many agricultural by-products - other than hemp shives - can be used in construction materials. Moreover, they are widely available thanks to the various local crops (sunflower, rapeseed, flax, etc.). Nevertheless, numerous obstacles explain the delicate insurability of these eco-materials, which currently limits their large-scale use for distributed insulation. Their complex behavior, when subjected to temperature and relative humidity variations, is probably one of the main obstacles to be overcome. The aim of this thesis work is therefore to gain a better understanding of the physical phenomena involved in these materials, to model them and to propose models for predicting their thermal behavior. It is mainly based on analytical homogenization techniques (Mori Tanaka and Double Inclusion) allowing the variability of thermal conductivity to be taken into account under use conditions. By considering a strategic scale, the plant particle one, it is possible to extend the approach to a wide range of agricultural co-products. The proposed multi-scale analysis enables the thermo-hygric behavior of these eco-materials to be predicted and optimized even before the manufacturing stage, and as a support for experimental work. This research is expected to encourage the emergence of local economies based on healthy, efficient and environmentally-friendly construction materials. They represent strategic levers in the reduction of greenhouse gas emissions targeted by the Green Pact for Europe between now and 2030