Removal of Cu2+ and Zn2+ in aqueous solutions by sorption onto mixed fly ash
- 31 May 2001
- journal article
- Published by Elsevier BV in Fuel
- Vol. 80 (6), 851-856
- https://doi.org/10.1016/s0016-2361(00)00153-8
Abstract
Disposal of a growing amount of fly ash creates environmental problems due to the leachability of their heavy metal content. However, fly ash is shown to be efficient in the removal of heavy metallic ions in the aqueous phase, for example, in the polluted wastewater resulting from desulfurization treatment in power plants. The objectives of this work were to study the removal of Cu2+ and Zn2+ in water by sorption onto fly ash and fly ash mixture. The stability of the resulting cake was also approached in terms of leaching capability. Experimental design methodology was used in order to identify influential parameters and to evaluate their interactions. Temperature, fly ash to ion concentration ratio, and ash quality were particularly studied. Different ashes and a fly ash mixture were investigated. They each have alkaline reaction with water to a different extent, and this allows the control of the pH solution without lime addition. Final metal ion concentration in solution, sorption capacity and ion leaching were determined. The results are discussed in order to get the optimal operating parameters in terms of ion control to develop industrial techniques to remove and stabilize heavy metal ions present in wastewater.Keywords
This publication has 6 references indexed in Scilit:
- Air oxidation of aqueous sodium sulfide solutions with coal fly ashWater Research, 1999
- Removal of CU, ZN and PB by adsorption onto fly ash and fly ash/lime mixingWater Science & Technology, 1999
- Influence of pH on Removal of Heavy Metallic Cations by Fly Ash in Aqueous SolutionEnvironmental Technology, 1998
- Sorption of Organic Contaminants by Fly Ash in a Single Solute SystemEnvironmental Science & Technology, 1995
- Fly ash as a sorbent for the removal of biologically resistant organic matterResources, Conservation and Recycling, 1992
- Copper(II) removal from aqueous solutions by fly ashWater Research, 1985