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| dc.contributor.author | Yesuf, Kedir | |
| dc.date.accessioned | 2020-03-18T07:47:54Z | |
| dc.date.available | 2020-03-18T07:47:54Z | |
| dc.date.issued | 2020-03-18 | |
| dc.identifier.uri | http://hdl.handle.net/123456789/10629 | |
| dc.description.abstract | Chromium(VI) discharge to the environment is becoming great concern for world. Even though there are enormous techniques for removal of chromium(VI), there is still a huge gap on alleviating the problem. Therefore, introducing feasible chromium(VI) removal technique using low cost available basalt rock was investigated in this study. The adsorbent was prepared by simple size reduction and activation method. The adsorbent prepared was characterized by XRD and FTIR. It was found that it contains mainly SiO2 and Al2O3 which have high affinity property and was characterized with functional groups (like carboxyl, and hydroxyl) which are responsible for adsorption mechanism. The adsorption potential of the rock was first checked in batch adsorption experiment. The adsorption capacity was found to be 14 mg g-1 which is adequate adsorption capacity comparing with other adsorbents. The batch adsorption result shows that Langmuir adsorption isotherm describes the adsorption process better than Freundlich with R2>0.9 supporting the nature of adsorption as a monolayer. Then continuous adsorption experiments were performed in fixed bed column to evaluate: - the effect of operating parameters, simplified fixed bed models, and desorption behavior of the adsorbent. The breakthrough curves served as indication of fixed bed behavior. It was observed that the saturation time of the bed is longer as the column depth increases and flow rate decrease. The adsorption data obtained in fixed bed column was simulated using simplified fixed bed models. It was found that the experimental results showed good agreement with the BDST and Yoon-Nelson model. It was found also that the adsorbent was successfully tested to reuse for four consecutive cycles. The adsorption capacity of regenerated basalt rock adsorbent for Cr(VI) was 2 mg g-1 in the fourth cycle, and the adsorbent retained approximately 23% of its original Cr(VI) adsorption capacity. Result of this research indicated that adsorbent prepared from basalt rock had a profound adsorption capacity in removal of chromium(VI) from aqueous solution in a continuous adsorption bed column. | en_US |
| dc.language.iso | en | en_US |
| dc.subject | Process Engineering | en_US |
| dc.title | Removal of Hexavalent Chromium from Aqueous Solution using Basalt Rock Adsorbent in Packed Bed Column | en_US |
| dc.type | Thesis | en_US |
