Article ID Journal Published Year Pages File Type
9680991 Desalination 2005 6 Pages PDF
Abstract
The objective of this work is to compare the removal of Ca2+, Mg2+, Na+ and K+ by kaolinite and carbon-materials prepared from pyrolysis of sewage sludge mixed with kaolinite. Three carbon-based materials were prepared by pyrolysis of the sewage sludge, the sludge with a 5% of kaolinite and the sludge with a 10% of kaolinite at 650°C, leading to SL-650, SL-650-5 and SL-650-10, respectively. The addition of kaolinite to the sewage sludge increased the cation exchange capacity of the final carbon-materials prepared by pyrolysis process. The increment raised to 37.6% and 45.3%, respectively, in the SL-650-5 and SL-650-10 with respect to the SL-650. The kaolinite and the carbon-based materials were mixed with solutions with different concentrations of Ca2+, Mg2+, Na+ or K+ (100 and 200 mg L−1). Results shown that the highest was pH, highest was the percentage of Ca2+ and Mg2+ removal by kaolinite and carbon-based materials. Nevertheless, the removal of Na+ and K+ was negligible. Results show that kaolinite and carbon-materials prepared by pyrolysis of mixtures of sewage sludge and kaolinite can be effective to the to reduce the hardness of water.
Related Topics
Physical Sciences and Engineering Chemical Engineering Filtration and Separation
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