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Removal of Arsenic, Boron, and Selenium from Excavated Rocks by Consecutive Washing

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Title: Removal of Arsenic, Boron, and Selenium from Excavated Rocks by Consecutive Washing
Authors: Tabelin, Carlito Baltazar Browse this author →ORCID
Basri, Amir Hamzah Mohd Browse this author
Igarashi, Toshifumi Browse this author →KAKEN DB
Yoneda, Tetsuro Browse this author →KAKEN DB
Keywords: Arsenic
Boron
Selenium
Excavated rocks
Washing
Issue Date: Sep-2012
Publisher: Springer Netherlands
Journal Title: Water, Air, & Soil Pollution
Volume: 223
Issue: 7
Start Page: 4153
End Page: 4167
Publisher DOI: 10.1007/s11270-012-1181-x
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.
Rights: The final publication is available at www.springerlink.com
Type: article (author version)
URI: http://hdl.handle.net/2115/50286
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: Tabelin, Carlito Baltazar

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