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| dc.contributor.author | SHIFERAW, SEGENET | |
| dc.date.accessioned | 2020-03-17T06:31:31Z | |
| dc.date.available | 2020-03-17T06:31:31Z | |
| dc.date.issued | 2020-03-17 | |
| dc.identifier.uri | http://hdl.handle.net/123456789/10475 | |
| dc.description.abstract | Releasing of wastewater contaminated with chromium has become a serious environmental problem in recent years. The removal and recovery of chromium from tannery wastewaters is crucial for environmental protection and economic reasons. Thus, this work focuses on investigating low cost powdered marble for effective removal of hexavalent chrome from aqueous solutions. Powdered marble was characterized by using FTIR for its Surface chemistry, XRD for morphology and crystallites and methyl blue adsorption for surfaceare determination. Adsorption experiments were carried out in a batch process and various Experimental Parameters such as temperature, initial concentration of chromium, adsorbent dose, stirring time and solution pH on the chromium adsorption were examined. Experimental results revealed that high removal efficiency; reaching a maximum value of 98.15% was achieved at alkaline media of pH >6 with the dose 40 g L-1. It was also found that Cr (VI) removal was increased with the increment of the adsorbent dosage and contact time until equilibrium reached. The results obtained for adsorption of chromium ions on to PMW ware well described by the Freundlich and Langmuir models. The best fit of Langmuir isotherm (R2=0.9911) indicate that the process may be chemisorption. Generally, this study showed that powdered marble is an effective and cheap adsorbent for the removal of Cr(VI) from aqueous solutions of leather industrial wastes. | en_US |
| dc.language.iso | en | en_US |
| dc.subject | Chemical Engineering | en_US |
| dc.title | REMOVAL EFFICIENCY OF HEXAVALENT CHROMIUM FROM TANNERY WASTEWATER USING INDUSTRIAL WASTE POWDERED MARBL | en_US |
| dc.type | Thesis | en_US |
