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Vol.2 , No. 6, Publication Date: Jan. 4, 2016, Page: 89-94
 Spectroscopic analysis of both samples after pretreatment with different concentrations sodium carbonate also indicate that the concentration of chromium in leather shaving was higher than that in its counterpart. The percentage recovery of chromium from both samples was determined with considerations given to parameters to examine the effect of acid concentration, and contact time. In most cases, the percentage recovery of chromium was observed to be higher for samples from leather buffing waste than that in leather shaving waste although the recorded amount of chromium in the latter was higher. It was discovered from this study that although more chromium was found in leather shaving waste than leather buffing waste, the percentage recovery of the metal from leather buffing waste was higher considering the parameters used in this study. Optimum recovery of chromium from both samples was however achieved when they were treated with 25% solution of sodium carbonate, carbonized at 600°C, acidified with 1.0M sulphuric acid, contacted with steam at temperature of 100°Cin the reactor for a maximum period of 40minutes. With these results, further study can be carried out to recycle and ascertain the efficiency of chromium extracted in leather tanning process.&picture=http://www.aascit.org/aascit/decorators/img/journal/905.jpg)
| [1] | Putshaka J. D., Department of Research and Development, Nigeria Institute of Leather and Science Technology, Zaria, Kaduna State - Nigeria. |
| [2] | Yakubu A., Department of Research and Development, Nigeria Institute of Leather and Science Technology, Zaria, Kaduna State - Nigeria. |
| [3] | Aliyu Jauro, Department of Chemistry, Abubakar Tafawa Balewa University, Bauchi State -Nigeria. |
| [4] | Harami H. M., Department of Chemistry, Abubakar Tafawa Balewa University, Bauchi State -Nigeria. |
| [5] | Kolo M., Department of Chemistry, Abubakar Tafawa Balewa University, Bauchi State -Nigeria. |
Samples of solid waste from the tanning industry in the form of buffing and shaving wastes were subjected to series of treatment in an attempt to extract chromium III from them. Results obtained from analysis of samples containing this metal show that leather buffing waste contained more moisture and volatile matter than that in leather shaving waste, while the latter contained more ash and chromium than the former. An upward trend in extractable chromium concentration in both leather shaving waste and leather buffing waste was observed with increase in the amount of alkali (sodium carbonate) Spectroscopic analysis of both samples after pretreatment with different concentrations sodium carbonate also indicate that the concentration of chromium in leather shaving was higher than that in its counterpart. The percentage recovery of chromium from both samples was determined with considerations given to parameters to examine the effect of acid concentration, and contact time. In most cases, the percentage recovery of chromium was observed to be higher for samples from leather buffing waste than that in leather shaving waste although the recorded amount of chromium in the latter was higher. It was discovered from this study that although more chromium was found in leather shaving waste than leather buffing waste, the percentage recovery of the metal from leather buffing waste was higher considering the parameters used in this study. Optimum recovery of chromium from both samples was however achieved when they were treated with 25% solution of sodium carbonate, carbonized at 600°C, acidified with 1.0M sulphuric acid, contacted with steam at temperature of 100°Cin the reactor for a maximum period of 40minutes. With these results, further study can be carried out to recycle and ascertain the efficiency of chromium extracted in leather tanning process.
Keywords
Chromium III, Hexavalent Chromium, Carcinogenic, Extraction, Tannery Solid Wastes, Buffing Waste, Shaving Waste, Carbonization
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