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Waste to wealth-recovery of total dietary fibers from waste peel: a generalized model for predicting operating parameters

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Abstract

Dietary fibers (DF) are separated by different methods, of which the dry processing method is relatively unexplored. For the first time, a dry process (elutriator) is reported to be used to recover DF from fruit peel. In this study, an elutriator was designed to separate DF from sweet lime peel (SLP) powder. Separated product was analyzed for total dietary fiber (TDF), and micrographs were taken using scanning electron microscopy (SEM) to understand the surface morphology. Effect of particle size and terminal velocity on the separation of DF was studied. Physical properties that are deterministic in the efficient separation of DF by dry separation methods are particle bulk density, equivalent spherical diameter, sphericity, and terminal velocities of fibers. Further, particle size, terminal velocity, and other operating parameters were optimized using Response Surface Methodology (RSM). By using an elutriator, the concentration of TDF increased from 62.15 to 82.26%. RSM models applied successfully for TDF and yield. A relationship between independent parameters like air velocity, particle size, and dependent parameters like yield and TDF recovered was developed. The generalized relationship was validated on SLP and predicted air velocity of 2.04 m/s and particle size 926.85 micron, which is found to meet experimental results as the best conditions to operate elutriator. A general model to predict air velocity to separate DF for the given peel waste based on particle bulk density, equivalent spherical diameter, and sphericity is proposed and validated.

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Funding

This study is carried out with financial support from the Department of Science and Technology (DST) of India (DST-SP/YO/039/2017).

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  1. Department of Chemical Engineering, Visvesvaraya National Institute of Technology, Nagpur, India

    Vishal V. Khanpit, Sachin A. Mandavgane & Sonali P. Tajane

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  1. Vishal V. Khanpit
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  2. Sachin A. Mandavgane
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  3. Sonali P. Tajane
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Correspondence to Sonali P. Tajane.

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Khanpit, V.V., Mandavgane, S.A. & Tajane, S.P. Waste to wealth-recovery of total dietary fibers from waste peel: a generalized model for predicting operating parameters. Biomass Conv. Bioref. 13, 9155–9164 (2023). https://doi.org/10.1007/s13399-021-01791-5

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  • DOI: https://doi.org/10.1007/s13399-021-01791-5

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