Evaluation of mixtures of peat,zero-valent iron and alkalinity amendments for treatment of acid rock drainage |
| |
| Institution: | 1. Department of Earth and Environmental Sciences & The Earth and Environmental Science System Research Center, Chonbuk National University, Jeonju-si, Jeollabuk-do, 561-756, Republic of Korea;2. Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada;1. Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver, BC, Canada;2. Ministry of Forests, Lands and Natural Resource Operations, Prince George, BC, Canada;3. Department of Earth and Environmental Sciences, Chonbuk National University, Jeonju, Jeollabuk-do 561-756, Republic of Korea;4. The Earth and Environmental Science System Research Center, Chonbuk National University, Jeonju, Jeollabuk-do 561-756, Republic of Korea;5. Atomic Energy of Canada Limited, Chalk River Laboratories, Chalk River, ON, Canada;1. Institute for Veterinary Medical Research, Centre for Agricultural Research, Hungarian Academy of Sciences, H-1143, Hungária krt. 21, Budapest, Hungary;2. Seqomics Biotechnology Ltd., H-6782, Vállalkozók útja 7, Mórahalom, Hungary;3. Institute of Biochemistry, Biological Research Centre, Hungarian Academy of Sciences, H-6726, Temesvári krt. 62, Szeged, Hungary;1. Nuclear Physics Institute, v.v.i., Academy of Sciences of the Czech Republic, ?e? 130, CZ-25068 ?e? near Prague, Czech Republic;2. Institute of Geology, v.v.i., Academy of Sciences of the Czech Republic, Rozvojová 269, CZ-16500 Prague 6, Czech Republic;4. Institute of Microbiology, v.v.i., Academy of Sciences of the Czech Republic, Vídeňská 1083, CZ-142 20 Prague 4, Czech Republic;1. School of Integrative Engineering, Chung-Ang University, 84 Heukseok-Ro, Dongjak-gu, Seoul 156-756, Republic of Korea;3. Institute of High Performance Computing, 1 Fusionopolis Way, #16-16 Connexis North, Singapore 138632, Republic of Singapore;4. Nano-Mechanical Systems Research Division, Korea Institute of Machinery & Materials (KIMM), 171 Jang-dong, Yuseong-gu, Daejeon 305-343, Republic of Korea;5. School of Chemical Engineering and SAINT, Sungkyunkwan University, Suwon 440-746, Republic of Korea;1. Institute of Ecology and Earth Sciences, University of Tartu, Vanemuise 46, 51014 Tartu, Estonia;2. Hydrosystems and Bioprocesses Research Unit, National Research Institute of Science and Technology for Environment and Agriculture (Irstea), 1 rue Pierre-Gilles de Gennes CS 10030, F92761 Antony Cedex, France;3. L''UNAM Université, Ecole des Mines de Nantes, CNRS, GEPEA UMR 6144, 4 rue Alfred Kastler, BP 20722, F-44307 Nantes, France |
| |
| Abstract: | Reactive mixtures to be used in a permeable reactive barrier (PRB) for the treatment of low quality groundwater derived from a mine waste rock storage site were evaluated. Low pH drainage water from the site contained high concentrations of sulfate and dissolved metals, including Al, Co, Ni, and Zn. Column experiments were conducted to evaluate whether mixtures containing either peat moss (as an organic carbon source) or a mixture of peat moss and granular zero-valent iron (ZVI) filings, in addition to small amounts of lime and/or limestone, were suitable treatment materials for removing these metals from the water. The experimental results showed that the mixtures promote bacterially-mediated sulfate reduction and metal removal by precipitation of metal sulfides, metal carbonate/hydroxide precipitation, and adsorption under relatively high pH conditions (pH of 7–8). Both reactive mixtures removed influent dissolved metals to near or below the limit of detection in the effluent throughout the experiment; however, influent-level concentrations of the metals of interest gradually moved through the column containing peat alone, as the pH neutralizing ability in the mixture was consumed. In contrast, the column containing both peat and ZVI showed very little breakthrough of the influent metals, suggesting that the longevity of the mixture including ZVI will be much longer than the mixture containing peat alone. The results show that both reactive mixtures should be effective in a PRB installation as long as neutral pH conditions and microbial activity are maintained. The cost to performance ratio of the two reactive mixtures will be a key factor in determining which mixture is best suited for a particular site. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
