Fluoride Removal using Modified Spent Diatomaceous Earth Adsorbents
| dc.contributor.advisor | Kiflie, Zebene(PhD) | |
| dc.contributor.author | Wolde, Temesgen | |
| dc.date.accessioned | 2018-07-27T12:28:44Z | |
| dc.date.accessioned | 2023-11-10T15:01:13Z | |
| dc.date.available | 2018-07-27T12:28:44Z | |
| dc.date.available | 2023-11-10T15:01:13Z | |
| dc.date.issued | 2017-10 | |
| dc.description.abstract | Elevated concentrations of fluoride in drinking water are a serious health concern. Dental and skeletal fluorosis being the most commonly reported fluoride-related diseases in Ethiopian rift valley. Various naturally occurring materials have been explored as adsorbents for the removal of fluoride from water .This study investigate the fluoride removal capacity of spent diatomaceous earth from aqueous solution. The spent diatomaceous earth was collected, washed and dried in an oven at 110 0C for 24 hrs. The dried 10 gram of spent diatomaceous earth was reacted in 100 ml of 0.1M HCl and dried in an oven at 110 0C .The dried spent diatomaceous are powdered, sieved and preserved. The effect of processing conditions (pH, initial fluoride concentration, adsorbent dose and contact time) was investigated using batch adsorption experiments. The adsorption efficiency was increased with increasing contact time and adsorbent dose and decreased with increasing pH and initial fluoride concentration. At low pH (2) maximum amount of fluoride was adsorbed by acid treated spent diatomaceous earth (58.48). Response surface methodology (RSM) involving Box–Behnken design was used to optimize the adsorption process of fluoride ions. The second order mathematical model was developed by regression analysis of the experimental data obtained from 29 batch runs. The optimum pH, initial fluoride concentration, adsorbent dose and contact time were found by desirability function to be 2.02,24.04mg/l, 18.83g and 2.95 hr respectively. Fluoride removal was 43.19% at the optimum combination of process parameters. The results of validation experiments conducted at optimum conditions for the removal of fluoride ions (42.94%) indicate that the predicted values are in good agreement with the experimental result. The adsorption data were well fitted to the Langmuir and Freundlich isotherm model. The adsorption capacity was 0.321 mg/g. Acid treated spent diatomaceous earth could be used as adsorbent for fluoride ion containing aqueous solution | en_US |
| dc.identifier.uri | http://etd.aau.edu.et/handle/12345678/10283 | |
| dc.language.iso | en | en_US |
| dc.publisher | Addis Ababa University | en_US |
| dc.subject | Diatomaceous Earth Adsorbents | en_US |
| dc.title | Fluoride Removal using Modified Spent Diatomaceous Earth Adsorbents | en_US |
| dc.type | Thesis | en_US |