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Title: Competitive adsorption between arsenic and fluoride from binary mixture on chemically treated laterite
Authors: Rathore V.K.
Dohare D.K.
Mondal, Prasenjit
Published in: Journal of Environmental Chemical Engineering
Abstract: The present paper deals with individual as well as simultaneous removal of arsenic and fluoride from synthetic water using acid-base treated laterite in batch mode along with management of the spent adsorbent. Optimum conditions for maximum removal of both arsenic and fluoride in single component system are found as pH 5, adsorbent dose 20 g L-1, contact time 300 min with initial concentration of arsenic and fluoride as 500 ?g L-1 and 10000 ?g L-1 respectively. Adsorption isotherm data fitted well to Langmuir model and under the optimum conditions the Langmuir adsorption capacity of present adsorbent is found to be 769 ?g g-1 for arsenic and 526 ?g g-1 for fluoride. Single component adsorption followed Pseudo 2nd order kinetics. The binary adsorption experiments were performed at the same optimum conditions with varying concentrations of arsenic and fluoride. The combined adsorptions of arsenic in binary systems do not differ much, while fluoride shows antagonistic behavior. The extended Freundlich model is found to best represent the apparent equilibrium adsorption phenomena in binary system. The present adsorbent is able to simultaneously reduce the arsenic and fluoride concentration below permissible limits of USEPA drinking water standards. Solidification technique was used for the management of the spent adsorbent by its immobilization in form of a clay brick. Leaching test results revealed that leaching of arsenic and fluoride from the spent adsorbent is well below the permissible limits as per the USEPA norms. © 2016 Elsevier Ltd. All rights reserved.
Citation: Journal of Environmental Chemical Engineering (2016), 4(2): 2417-2430
Issue Date: 2016
Publisher: Elsevier Ltd
Keywords: Acid-base treated laterite
Binary adsorption
Binary adsorption isotherms
Spent adsorbent management
ISSN: 22133437
Author Scopus IDs: 50162189900
Author Affiliations: Rathore, V.K., Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee, 247667, India
Dohare, D.K., Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee, 247667, India
Mondal, P., Department of Chemical Engineering, Indian Institute of Technology Roorkee, Roorkee, 247667, India
Funding Details: Facilities provided by Indian Institute of Technology Roorkee, Roorkee (India) and financial support provided by the Ministry of Drinking Water, Government of India, New Delhi under grant number MRD-623-CHD is greatly acknowledged. Appendix A
Corresponding Author: Mondal, P.; Department of Chemical Engineering, Indian Institute of Technology RoorkeeIndia; email:
Appears in Collections:Journal Publications [CH]

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