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DOI: https://doi.org/10.4491/eer.2017.179
Removal of sulphate from landfill leachate by crystallization
Ahmet Aygun1, Selim Dogan2, Mehmet Emin Argun2, and Havva Ates2
1Department of Environmental Engineering, Faculty of Engineering and Natural Sciences, Bursa Technical University, Bursa 16310, Turkey
2Department of Environmental Engineering, Engineering Faculty, Selcuk University, Konya 42003, Turkey
Corresponding Author: Ahmet Aygun ,Tel: +90-224-300-3590, Fax: +90-224-300-3419, Email: ahmet.aygun@btu.edu.tr
Received: November 15, 2017;  Accepted: May 7, 2018.
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ABSTRACT
The present study explores the applicability of response surface methodology (RSM) in conjunction with central composite design (CCD) matrix to statistically optimize ettringite crystallization process for the removal of sulphate from landfill leachate. A three factor-five coded level CCD with 20 runs, was performed to estimate the best fitted model. The RSM results indicated that the fitted quadratic regression model could be appropriate to predict sulfate removal efficiency. The pH was identified as the most dominant parameter affecting sulphate removal. 61.6% of maximum sulphate removal efficiency was obtained at pH of 11.06 for a 1.87 of Ca/SO4 and 0.51 of Al/SO4 molar ratios. The operating cost for ettringite crystallization at optimized conditions was calculated to be 0.52 $/m3. The significance of independent variables and their interactions were tested by analysis of variance. Scanning electronic microscope (SEM) and SEM coupled with energy dispersive X-Ray spect
Keywords: Ettringite crystallization | Leachate | Response surface methodology (RSM) | Scanning electron microscope (SEM) | Sulphate removal
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