Valorisation des coques d’anacarde par pyrolyse au Bénin

Godjo, Thierry; Tagutchou, Jean-Philippe; Naquin, Pascale; Gourdon, Rémy

doi:10.4267/dechets-sciences-techniques.3282

Cited by 12 publications

(10 citation statements)

References 3 publications

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“…They use unsustainable energy sources such as wood and butane gas at excessive costs, leading them to resort to cashew shells as fuel in the processing chain, in particular for the embrittlement of nuts, cooking with steaming and drying almonds (Thiombiano et al, 2011). Godjo et al ( 2015) showed cashew nut shells burning causes significant damage to environment and human health. Cashew nut consists of hard woody shell containing liquid (Cashew Nut Shell Liquid CNSL).…”

Section: Introductionmentioning

confidence: 99%

Influence of Inoculums Source and Pretreatment on Biogas Production from Cashew Nut Shells (Anacardium occidentale)

Nikiema¹,

Sawadogo²,

Somda³

et al. 2021

IJEAB

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Section: Introductionmentioning

confidence: 99%

Influence of Inoculums Source and Pretreatment on Biogas Production from Cashew Nut Shells (Anacardium occidentale)

Nikiema¹,

Sawadogo²,

Somda³

et al. 2021

IJEAB

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“…Due to its hydrophilic nature, it can quickly reabsorb moisture from the atmosphere, resulting in an irreversible water absorption that ranges from 5 to 10% depending on the species (FAO, 1985). In addition, the lowest moisture content obtained in the Casamance kiln could be explained by the quality of carbonization, which is faster and more uniform in this type of kiln, due to better air circulation in the combustion chamber, than in the two other types of kilns (Júnior et al, 2015;GIZ-HERA, 2020).…”

Section: Variability Of Moisture Contentmentioning

confidence: 86%

“…The ash content was quantified in accordance with the NF EN 14775 (AFNOR, 2010c) which requires that the crucibles be placed in the muffle furnace at 750 °C for 6 h. The fixed carbon content is derived after determining the moisture content of the charcoal, the volatile matter index and the ash content. All weights were taken with an accuracy of 0.01 g. The moisture content and chemical components were calculated based on the dry mass of the charcoal (Godjo et al, 2015).…”

Section: Chemical Composition Of Charcoalmentioning

confidence: 99%

Carbonization techniques and wood species influence quality attributes of charcoals produced from industrial sawmill residues in Eastern Cameroon

et al. 2020

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Cameroon harvests a considerable volume of round wood each year, only a small part of which is used for manufactured products. In recent decades, various charcoal-making initiatives have emerged around industrial timber-processing units, particularly in the eastern region, in order to develop a market for residual biomass. However, the undifferentiated use of these residues obtained from different species often results in products with varying energy potential that are not always appreciated by consumers. Moreover, the physical and chemical characteristics of the charcoal produced are unknown, as are the factors that influence its quality. The aim of this study was to assess the variability of the physical and chemical properties of charcoal produced from industrial sawmill residues in the eastern region of Cameroon using different carbonisation techniques. Three wood species, Ayous, Frake and Movingui, and three types of kilns (traditional, improved traditional and Casamance system) were used. For each species, three bundles of five pieces of wood each were prepared, with an initial moisture content ranging from 28% to 36%. The physical and chemical properties determined were moisture content, apparent density, volatile matter content, fixed carbon content, ash content and Higher Heating Value (HHV). Our results showed that the charcoal properties varied depending on the wood species and types of kilns used. Movingui, with the highest density (0.73 g/cm3), produced charcoal with the lowest moisture content (4.03%) and the highest apparent density (0.42 g/cm3). The lowest volatile matter content (20.32%), the lowest ash content (1.27%) and the highest fixed carbon content (74.95%) were also obtained with this species. All these values were obtained with Movingui charcoal produced with the Casamance system. However, the highest HHV (32.51 MJ/kg) was obtained with charcoal from Ayous, also produced with the Casamance system. On comparing the three charcoaling systems used, the Casamance model yielded the best physical and chemical charcoal properties. All the charcoals studied complied with FAO standards for cooking fuel. The highest HHV obtained with charcoal from Ayous hardwood shows its ability to release large amounts of thermal energy during combustion. Keywords: Charcoal, carbonization technologies, eastern Cameroon, physicochemical properties, industrial sawmills wastes.

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“…In 2017, about 4.5 million metric tonnes (MMT) was generated globally, with Nigeria generating about 0.1 MMT [19]. From 2.5 MMT of cashew nuts generation, about 1.825 MMT of waste is obtained [20]. However, it is worrisome to observe that this material is usually discarded as waste, causing environmental problems.…”

Section: Introductionmentioning

confidence: 99%

Optimising the Workability and Strength of Concrete Modified with Anacardium Occidentale Nutshell Ash

Oyebisi

Ede

Owamah

et al. 2021

Fibers

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Strength failure persists both in structural and mechanical analysis. One of its prominent characteristics is the adequate provision for parameters that minimise or maximise strength objectives while satisfying boundary conditions. The previous optimisation of concrete strength usually neglects mix design mechanisms induced by optimisation. Recent efforts to accurately optimise the concrete compressive strength have factored in some of these mechanisms. However, optimising concrete strength modified with high silica and alumina precursors, and crucial mix design factors are rare. Consequently, this paper optimised the concrete workability and strength, incorporating binding, water/binder ratio, binder/aggregate ratio, and curing mechanisms using the Box–Behnken design approach (BBDA). A waste material, anacardium occidentale (cashew) nutshell ash, was valorised and used at 5, 10, and 15 wt.% of cement. The composites were made, cured and tested at 14–90 d. The results revealed a high precision between the experimental slump and the optimisation slump at 97% R2. In addition, a 5% increase in compressive strength was obtained compared with the target compressive strength. Besides, the correlation between the model equation obtained from this study and predictions of previous studies via BBDA yielded a strong relationship.

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Valorisation des coques d’anacarde par pyrolyse au Bénin

Abstract: RÉSUMÉ Face aux difficultés d'accès à l'énergie et de gestion des déchets issus de la transformation des noix d'anacarde au Bénin, les coques stockées dans les usines de transformation sont directement utilisées comme combustibles. Elles sont ainsi brûlées dans des fours

Cited by 12 publications

References 3 publications

Influence of Inoculums Source and Pretreatment on Biogas Production from Cashew Nut Shells (Anacardium occidentale)

Influence of Inoculums Source and Pretreatment on Biogas Production from Cashew Nut Shells (Anacardium occidentale)

Carbonization techniques and wood species influence quality attributes of charcoals produced from industrial sawmill residues in Eastern Cameroon

Optimising the Workability and Strength of Concrete Modified with Anacardium Occidentale Nutshell Ash

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