Abraham, Aynekugnem (2015) Chromium Removal from Chromium Rich Tannery Wastewater using Eucalyptus camaldulensis Dehnh. Bark Powder as an Adsorbent, the Case of Modjo Tannery, Ethiopia. Masters thesis, Addis Ababa University.
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Abstract
Tannery industries are the main source of chromium in the environment which is carcinogenic to human, hinder development of plants. Since removal by adsorption is cost effective, not time consuming and environmentally friendly, it has been widely studied by many scholars for the remediation of heavy metals. This work objective was to use E. camaldulnesis bark powder as an adsorbent for the removal of chromium from chromium rich tannery wastewater at different pH, contact time, adsorbent dose and initial concentration. The bark’s powder physico-chemical characterization shows that it is reddish in color with porosity of 74.9%, ash content 4.5%, moisture content 1.58%, bulk density 1.55g/cm3, particle density 0.389 g/cm3, carbon 16.41% and nitrogen 2.63%. FT-IR analysis revealed the presence of multiple functional groups in the adsorbent. The effects of experimental parameters such as, pH of initial concentration of chromium solutions, contact time, dosage of adsorbent and initial concentration of chromium in the solutions were thoroughly investigated. The result showed that 90% and above removal capacity at pH 5, 2.5h contact time and 20g/L of adsorbent dose. With this optimum condition kinetics and isotherm of the adsorption process were analyzed using different models. The result revealed that kinetics of the process fitted well the pseudo-second order kinetic model and from the tested isotherm models the Feundlich model was found to be the best fit. All this indicate that E. camaldulnesis bark powder has a good potential to be used as an alternative low cost adsorbent for the removal of chromium from tannery wastewater.
| Item Type: | Thesis (Masters) |
|---|---|
| Uncontrolled Keywords: | Adsorption, chromium, E. camaldulnesis bark powder, Isotherm and Kinetics |
| Subjects: | G Geography. Anthropology. Recreation > GE Environmental Sciences Q Science > Q Science (General) Q Science > QD Chemistry |
| Divisions: | Africana |
| Depositing User: | Selom Ghislain |
| Date Deposited: | 18 Jun 2018 09:53 |
| Last Modified: | 18 Jun 2018 09:53 |
| URI: | http://thesisbank.jhia.ac.ke/id/eprint/4346 |
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