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A Study of Fluoride and Arsenic Adsorption from Aqueous Solution Using Alum Sludge Based Adsorbent
알럼 슬러지 기반 흡착제를 이용한 수용액상 불소 및 비소 흡착에 관한 연구
Econ. Environ. Geol. 2020 Dec;53(6):667-75
Published online December 31, 2020;  https://doi.org/10.9719/EEG.2020.53.6.667
Copyright © 2020 the Korean society of economic and environmental gelology.

Joon Hak Lee1,2, Won Hyun Ji1, Jin Soo Lee1, Seong Sook Park2, Kung Won Choi2, Chan Ung Kang3 and Sun Joon Kim2*
이준학1,2 · 지원현1 · 이진수1 · 박성숙2 · 최궁원2 · 강찬웅3 · 김선준2*

1Institute of Mine Reclamation Technology, Mine Reclamation Corporation 2, Wonju 26464, Republic of Korea
2 Department of Earth Resources and Environmental Engineering, Hanyang University, Seoul 04763, Republic of Korea
3 Golden Engineering CO, LTD, Seoul 05836, Republic of Korea
1한국광해관리공단, 광해방지연구실, 2한양대학교 공과대학 자원환경공학과, 3(주)골든엔지니어링
Received October 5, 2020; Revised November 27, 2020; Accepted December 1, 2020.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
 Abstract
An Alum-sludge based adsorbent (ASBA) was synthesized by the hydrothermal treatment of alum sludge obtained from settling basin in water treatment plant. ASBA was applied to remove fluoride and arsenic in artificially-contaminated aqueous solutions and mine drainage. The mineralogical crystal structure, composition, and specific surface area of ASBA were identified. The result revealed that ASBA has irregular pores and a specific surface area of 87.25 m2 g-1 on its surface, which is advantageous for quick and facile adsorption. The main mineral components of the adsorbent were found to be quartz(SiO2), montmorillonite((Al,Mg)2Si4O10(OH)2·4H2O) and albite(NaAlSi3O8). The effects of pH, reaction time, initial concentration, and temperature on removal of fluoride and arsenic were examined. The results of the experiments showed that, the adsorbed amount of fluoride and arsenic gradually decreased with increasing pH. Based on the results of kinetic and isotherm experiments, the maximum adsorption capacity of fluoride and arsenic were 7.6 and 5.6 mg g-1, respectively. Developed models of fluoride and arsenic were suitable for the Langmuir and Freundlich models. Moreover, As for fluoride and arsenic, the increase rate of adsorption concentration decreased after 8 and 12 hr, respectively, after the start of the reaction. Also, the thermodynamic data showed that the amount of fluoride and arsenic adsorbed onto ASBA increased with increasing temperature from 25o C to 35o C, indicating that the adsorption was endothermic and non-spontaneous reaction. As a result of regeneration experiments, ASBA can be regenerated by 1N of NaOH. In the actual mine drainage experiment, it was found that it has relatively high removal rates of 77% and 69%. The experimental results show ASBA is effective as an adsorbent for removal fluoride and arsenic from mine drainage, which has a small flow rate and acid/neutral pH environment.
Keywords : Alum sludge, adsorption, mine drainage, fluoride, arsenic

 

December 2020, 53 (6)