Mirwan, Agus Aluminum leaching from water treatment sludge using hydrochloric acid and kinetic study. Environmental Science and Pollution Research.
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Abstract
Abstract Water treatment sludge (WTS) is abundantly produced in the world; the waste contributes to the environmental problems. Therefore, for WTS utilization, aluminum leaching was employed using hydrochloric acid in this study. Al leaching efficiency increased from 72% to 80% as hydrochloric acid concentration increased from 1 to 4 M. Decreasing the particle size and increasing the temperature increased Al leaching efficiency. The proposed kinetic model revealed that the rate-controlling step followed a series of two leaching mechanisms: initially controlled by product-layer diffusion and then by a chemically controlled reaction. For instance, at 70 °C, the initial stage is well fitted by product-layer diffusion (R2 = 0.87) compared to R2 = 0.60 for chemical reaction; while for the second stage, R2 = 0.95 was observed via chemical reaction compared to R2 = 0.74 for productlayer diffusion. The activation energies in these two stages were 9.58 kJ/mol and 10.73 kJ/mol, respectively. The proposed model was well validated by using data from literature and thus will be useful for other applications of leaching and extraction processes. Keywords Waste . Environmental problem . Mechanism . Model . Chemical surface . Diffusion . Removal
| Item Type: | Article |
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| Subjects: | Q Science > QD Chemistry |
| Depositing User: | S.Kom Handoko Handoko |
| Date Deposited: | 24 Jun 2020 04:10 |
| Last Modified: | 24 Jun 2020 04:10 |
| URI: | http://eprints.ulm.ac.id/id/eprint/9774 |
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