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Biomass Conversion and Biorefinery

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27.03.2021 | Original Article

Statistical optimization of mixed peanut shell and Khat (Catha edulis) stem carbonization process for molasses enhanced cold and low-pressure pelletization

verfasst von: Birhan Gebregziabher, Shimelis Kebede Kassahun, Zebene Kiflie

Erschienen in: Biomass Conversion and Biorefinery | Ausgabe 6/2023

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Abstract

In Ethiopia, the agricultural residues Khat (Catha edulis) stem and peanut or groundnut (Arachis hypogaea) shell are dumped in large quantities as solid waste posing significant environmental problems. This study was aimed at utilizing a mixture of these agricultural residues by combination of carbonization and cold pelleting technique. Response surface methodology (RSM) statistical experimental design was used to optimize the carbonization condition. Carbonization temperature, time, and biomass mix composition expressed as percent by weight of peanut shell (w/w %) were selected as the experimental parameters. The calorific value and charcoal yield of carbonized samples were examined as experimental responses. Based on the analysis of variance, carbonization temperature and biomass mix ratio were found significant study parameters, which affected the calorific value as well as charcoal yield. The interaction effects of the selected parameters well fitted with the second-order quadratic model equation. The optimum values of the influencing parameters were found to be at carbonization temperature of 402 °C, carbonization time of 97 min, and mix composition of 70 w/w % for maximum calorific value of 25.28 MJ/kg and charcoal yield of 41.84%. Furthermore, the mixed carbonized biomass prepared at the optimum condition was used for pellet preparation using the molasses-enhanced cold pelletization process. Results show that the density, calorific value, and mechanical strength of the pellet samples were significantly improved due to the addition of molasses as a binder.

Vorheriger Artikel Char production with high-energy value and standardized properties from two types of biomass

Nächster Artikel Chrysophyllum albidum stem bark extract coated tillite adsorbent for the uptake of Cr(VI): thermodynamic, kinetic, isotherm, and reusability

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Titel: Statistical optimization of mixed peanut shell and Khat (Catha edulis) stem carbonization process for molasses enhanced cold and low-pressure pelletization
verfasst von: Birhan Gebregziabher
Shimelis Kebede Kassahun
Zebene Kiflie
Publikationsdatum: 27.03.2021
Verlag: Springer Berlin Heidelberg
Erschienen in: Biomass Conversion and Biorefinery / Ausgabe 6/2023
Print ISSN: 2190-6815
Elektronische ISSN: 2190-6823
DOI: https://doi.org/10.1007/s13399-021-01446-5

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