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FABRICATION OF SAWDUST BRIQUETTES USING LOCAL BANANA PULP AS A BINDER

  • Lindrose Nyathi - Chemical and Processing Engineering Department, Manicaland State University of Applied Sciences, Zimbabwe
  • Gratitude Charis - Chemical, Materials and Metallurgical Engineering Department, Botswana International University of Science and Technology, Botswana - Chemical and Processing Engineering Department, Manicaland State University of Applied Sciences, Zimbabwe
  • Marko Chigondo - Chemical and Processing Engineering Department, Manicaland State University of Applied Sciences, Zimbabwe
  • Munashe Maposa - Chemical and Processing Engineering Department, Manicaland State University of Applied Sciences, Zimbabwe
  • Delroy Nyadenga - Chemical and Processing Engineering Department, Manicaland State University of Applied Sciences, Zimbabwe
  • Knowledge Nyenyayi - Chemical and Processing Engineering Department, Manicaland State University of Applied Sciences, Zimbabwe

DOI 10.31025/2611-4135/2022.15193

Released under CC BY-NC-ND

Copyright: © 2022 CISA Publisher

Abstract

Sawdust is generated in large quantities in sawmills in Manicaland province in Zimbabwe, posing an environmental threat if incinerated or left to accumulate. This presents an opportunity for valorising the waste into briquettes. To make the briquettes cost effective, a cheap and locally available binder is needed. Hence, the use of banana waste pulp (green banana, ripe banana, pseudo-stem pith and fruit-bunch-stem) as a sawdust briquettes binder was investigated in this study. The quality of fabricated briquettes was evaluated based on relative density, shatter index, ignition time, burning rate, and time taken to boil a constant amount of water. The briquettes showed improved qualities with the increase in binder ratios. The sawdust-binder ratio of 1:4 showed the best briquettes qualities. Factor rating method was done in order to obtain the best scored (scale 0-100) briquettes reflecting weightier factors (scale 0-1). The weightiest factors were time taken to boil water (0.25) and shatter index (0.25), with three other factors weighing 0.5. The best five binder formulations in their order were; banana-pseudo stem-pith (pith) and ripe banana (RB) in the ratio of 3:1 respectively (score weight of 68.75), fruit-bunch-stem, banana-pseudo-stem-pith (pith), green banana (GB) and ripe banana (RB) in the ratio of 2:2:1:1 respectively (score weight of 68.3), banana-pseudo-stem-pith (pith), ripe banana (RB) and green banana (GB) 2:1:1 respectively (score weight of 66.95), banana-pseudo-stem-pith, ripe banana and green banana in the ratios of 2,5:1,5:1 respectively (score weight of 66.05) and banana-pseudo-stem-pith and ripe banana in the ratios of 1:1 (score weight 65.55).

Keywords

Editorial History

  • Received: 17 Mar 2022
  • Revised: 19 May 2022
  • Accepted: 06 Jun 2022
  • Available online: 30 Jun 2022

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