Green and Sustainable Chemistry, 2018, 8, 295-310 http://www.scirp.org/journal/gsc ISSN Online: 2160-696X ISSN Print: 2160-6951 DOI: 10.4236/gsc.2018.84020 Oct. 10, 2018 295 Green and Sustainable Chemistry Passive Remediation of Acid Mine Drainage Using Ball-Milling Modified Indonesian Natural Bentonite: Laboratory Batch and Column Sorption of Manganese Widyawanto Prastistho 1,2* , Winarto Kurniawan 1 , Hirofumi Hinode 1 1 Department of International Development Engineering, Tokyo Institute of Technology, Tokyo, Japan 2 Department of Environmental Engineering, Universitas Pembangunan Nasional “Veteran”, Yogyakarta, Indonesia Abstract Manganese (Mn) is an essential element for human body. However, elevated concentration of manganese causes severe problem and disease. Acid mine drainage (AMD), wastewater generated due to open-pit mining, commonly contains Mn with exceeded concentration. This study is to investigate the improvement of ball-milling modified Indonesian natural bentonite (INB) for manganese (Mn) removal from AMD and to increase the pH through batch and column sorption test as a passive treatment system approach. The batch sorption test result showed the maximum Mn adsorbed (Q m ) on INB from the Langmuir model increased from 4.69 to 17.12 mg/g after milling. The column sorption test result also showed the amount of Mn adsorbed on INB until breakthrough time (q u ) and until saturation time (q) increased after mil- ling. The q u increased from 1.27 to 10.06 mg/g, and the q increased from 4.55 to 12.91 mg/g. The mass transfer zone (MTZ) became significantly shorter after milling from 0.22 to 0.07 cm. The Thomas model exhibited the equili- brium uptake of Mn (q 0 ) increased after milling from 3.91 to 13.72 mg/g. In equilibrium condition, both unmilled and milled INB showed the pH in- creased from ≈3 to 8. Keywords Bentonite, Ball-Milling, Manganese, Acid Mine Drainage, Batch and Column Sorption 1. Introduction Acid mine drainage (AMD) is mining wastewater generated when the sulfide How to cite this paper: Prastistho, W., Kurniawan, W. and Hinode, H. (2018) Pas- sive Remediation of Acid Mine Drainage Using Ball-Milling Modified Indonesian Natural Bentonite: Laboratory Batch and Column Sorption of Manganese. Green and Sustainable Chemistry, 8, 295-310. https://doi.org/10.4236/gsc.2018.84020 Received: September 1, 2018 Accepted: October 7, 2018 Published: October 10, 2018 Copyright © 2018 by authors and Scientific Research Publishing Inc. This work is licensed under the Creative Commons Attribution International License (CC BY 4.0). http://creativecommons.org/licenses/by/4.0/ Open Access