Removal of Cadmium lons from Industrial Wastewater by Cementation | ||||
| Journal of High Institute of Public Health | ||||
| Article 3, Volume 30, Issue 1, January 2000, Page 39-48 | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jhiph.2000.317221 | ||||
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| Authors | ||||
| S A. Nosier1; W El-Shalt2 | ||||
| 1Department of Chemical Engineering, Faculty of Engineering, Alexandria University, Egypt | ||||
| 2Department of Environmental Health, High Institute of Public Health, Alexandria University, Egypt | ||||
| Abstract | ||||
| Electroplating wastewater constitute a major source for environmental pollution with heavy metal ions such as Cu++, Cd++, Pb++ and Cr6+ These ions are lethal to man and aquatic life as well, therefore should be removed from wastewater before disposal of waste. The present work is concerned with the removal of Cd++ from wastewater by cementation on zinc in a batch stirred tank reactor lined with a cylindrical zinc sheet. The rate of Cd++ removal was studied under different conditions of impeller rotation speed, initial Cd++ concentration, temperature and time of cementation. It was found that the rate of Cd++ removel increases with increasing impeller rotation speed, temperature, initial concentration and residence time. Mechanistic study of the reaction through activation energy [8.6 kcal/mole] determination showed that cementation of Cd++ on zinc is a diffusion controlled reaction. Visual observations showed that cadmium deposits on zinc in the form of powder. Cadmium powder is a valuable salable product which can improve the economy of the process. Suggestions for improving the efficiency of the present technique by using baffled vessels have been concluded. | ||||
| Keywords | ||||
| Cadmium lons; Industrial Wastewater; Cementation | ||||
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