We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Removal of Arsenic, Boron, and Selenium from Excavated Rocks by Consecutive Washing.
- Authors
Tabelin, Carlito; Basri, Amir; Igarashi, Toshifumi; Yoneda, Tetsuro
- Abstract
This paper describes the leaching behavior and release mechanisms of arsenic (As), boron (B), and selenium (Se) from excavated rocks using sequential extraction for solid-phase fractionation, batch experiments with pH variation, and consecutive batch experiments with changes in the solid-liquid mixing ratios. Arsenic in the excavated rock was mostly found with the sulfides/organic matter fraction while majority of the leachable B and Se were associated with the exchangeable phases. The leaching of As was strongly pH dependent, Se was pH dependent only around the acidic region, and B was pH independent. Consecutive washing technique with deionized water effectively lowered the B and Se concentrations in the leachate below the drinking water standards of Japan, but was inefficient in the removal of As. Arsenic exhibited non-conservative leaching behavior and its movement was affected by processes like dissolution, precipitation, and pyrite oxidation. In contrast, B and Se behaved more conservatively, resulting in their easy removal from the excavated rock by simple washing and dilution.
- Subjects
ROCK excavation; ARSENIC removal (Water purification); PH effect; SOLID phase extraction; SOLID-liquid interfaces; CHEMISTRY experiments; DISSOLUTION (Chemistry)
- Publication
Water, Air & Soil Pollution, 2012, Vol 223, Issue 7, p4153
- ISSN
0049-6979
- Publication type
Article
- DOI
10.1007/s11270-012-1181-x