Multimetal Adsorption Isotherm Studies of Ground Granulated Blast Furnace Slag from Municipal Solid Waste Leachate
Publication: Journal of Hazardous, Toxic, and Radioactive Waste
Volume 25, Issue 2
Abstract
This paper aims to study the simultaneous adsorption of multiple heavy metal ions present in municipal solid waste (MSW) leachate. Leachate samples have been found to contain the heavy metal ions copper [Cu (1.22 mg/L)], zinc [Zn (2.86 mg/L)], lead [Pb (2.62 mg/L)], chromium [Cr (1.5 mg/L)], and nickel [Ni (0.65 mg/L)]. Ground granulated blast furnace slag (GGBS) will be used in this paper as adsorbent. The adsorptive capability of GGBS will be studied using the extended Langmuir isotherm model, Langmuir–Freundlich isotherm model, and multicomponent isotherm model. The extended Langmuir adsorption isotherm model fits the experimental values better than the other two models. The synergism, antagonism, and noninteraction effects will be studied based on the equilibrium metal uptake values. For all heavy metals present in the leachate used in this paper, the values of qmix/qo were >0, which indicated that multimetal adsorption was feasible by GGBS. This is the indication of enormous active sites on its surface. In addition, this was confirmed by the values of qmix/qo, because synergism was followed by antagonism. Ni ions showed a higher synergism effect that increased with an increase in GGBS dose. The adsorption effect of Cr experienced a transition from antagonism to synergism effect above 0.4 g of GGBS dose, which indicated the competition between Ni and Cr. The interactive effect for Pb fluctuated. Cu and Zn showed a strong antagonistic effect, Pb showed a moderate synergic effect, and Cr and Ni showed a strong synergic effect. The dose of GGBS has a predominant role in the adsorption of multiple heavy metal ions.
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Data Availability Statement
The data related to the collection of samples, sampling, analysis, and amount of multiple heavy metal ions removed using GGBS that support the findings of this paper are available from the corresponding author upon reasonable request.
The three multicomponent adsorption isotherm models developed using fminsearch tool in MATLAB used during the paper are given in the submitted article as Appendixes I, II, and III.
Acknowledgments
The authors wish to express their sincere gratitude for the support extended by the authorities of Annamalai University, Annamalai Nagar, Tamil Nadu, India in carrying out the research work in Environmental Engineering Laboratory, Department of Civil Engineering, Faculty of Engineering and Technology, Annamalai University.
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Published In
Journal of Hazardous, Toxic, and Radioactive Waste
Volume 25 • Issue 2 • April 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: May 28, 2020
Accepted: Oct 29, 2020
Published online: Jan 12, 2021
Published in print: Apr 1, 2021
Discussion open until: Jun 12, 2021
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