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| dc.contributor.author | Moges, Asfaw Mengistu | |
| dc.date.accessioned | 2023-06-01T07:13:58Z | |
| dc.date.available | 2023-06-01T07:13:58Z | |
| dc.date.issued | 2022-06 | |
| dc.identifier.uri | http://ir.bdu.edu.et/handle/123456789/15304 | |
| dc.description.abstract | Skin and hide chrome shaving wastes from tanneries are generated during leather processing. The chrome shaving wastes contained significant quantity of protein and chromium which was dumped into sites or land fill, consequently creating the major environmental problem of the tanning industries throughout the world. The objective of this work is to indicate a method or technique to develop retanning agent for use in leather industry from the waste generated by the tanning industry. The extracted chrome shaving hydrolysate, containing the protein fractions was prepared by alkaline hydrolysis in the presence of sodium hydroxide at a pH of 11.5-12.20. As SPSS result, the effect of time, temperature, alkaline concentration and their interaction on yield of collagen hydrolysate were significant mean that there was difference in treatment mean if the F value from SPSS is greater than the F Value from appendix where as the interaction of alkaline concentration and temperature was no significant impact because the F value from SPSS is less than the F value from appendix. As the result indicated that the moisture, ash, total solid, protein, fat and chromic oxide content of the collagen hydrolysate was found to be 45.32%,11%,109 gm/L,74.81%,0.48 and nil respectively. Organoleptic properties and physical tests of the leather article prepared. Evaluated by experts and found to be on graph with that of the control leathers. Thermo gravimetric analysis result indicated that the thermal transition temperatures of thermal decomposition were accompanied by weight loss for CPrF and for PrH mass which was response to thermal stability for PrH is slightly better. The FTIR result indicates that the bands at around 1510-1528 cm -1 and ~1400 cm -1 signified the presence of (-NH3 + ) and (–COO -) for PrH which was pronounced during retanning and dying process to give better color depth, tear strength, tensile strength. The major finding of the study was PrH filler which was extracted from chrome shaving waste through hydrolysis method in protein extractor which was computable, effective and efficient for leather process application. This study also answered the disposal problem associated with the solid waste generated form tanning industries as well as economical beneficial. The proposed methodology could be easily adopted by all leather industries. Key word Collagen, Protein, Hydrolysis, chrome shaving, extraction, retanning | en_US |
| dc.language.iso | en_US | en_US |
| dc.subject | Chemical and Food Engineering | en_US |
| dc.title | Extraction of Protein-Based Value-Added Product from Chrome Shavings and Substitute in Leather Processing: a Case Study of Wallia Leather and Leather Products Factory | en_US |
| dc.type | Thesis | en_US |
