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The formation of Fe colloids and layered double hydroxides as sequestration agents in the natural remediation of mine drainage

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Title: The formation of Fe colloids and layered double hydroxides as sequestration agents in the natural remediation of mine drainage
Authors: Chikanda, Frances Browse this author
Otake, Tsubasa Browse this author →KAKEN DB
Koide, Aoi Browse this author
Ito, Akane Browse this author
Sato, Tsutomu Browse this author →KAKEN DB
Keywords: Passive treatment
Fe colloid transport
Seasonal variation
Issue Date: 20-Jun-2021
Publisher: Elsevier
Journal Title: Science of the total environment
Volume: 774
Start Page: 145183
Publisher DOI: 10.1016/j.scitotenv.2021.145183
Abstract: The increasing need to treat wastewater from mine effluents has drawn attention to passive treatment systems. Colloids are common in mine waters and are highly reactive, so their formation, characteristics, behavior, and the critical factors that affect them need to be understood for designing efficient treatment systems. An investigation was conducted at the abandoned Ainai mine drainage, Japan, where aeration is utilized to remove Fe, As, and Zn from circumneutral wastewater drainage, during rainy and dry seasons of 2016 and 2018 respectively, based on observations of physiochemical characteristics, elemental concentrations in dissolved and colloidal fractions, transmission electron microscopy, and synthetic experiments. In this circumneutral Fe-rich mine drainage, Fe2+ is oxidized to Fe3+, resulting in the formation of Fe colloids that incorporate As during their formation. Colloid formation increases turbidity, and, in the rainy season, increased colloidal interaction enhances their aggregation and higher flow rates lead to greater mobilization of the colloids. Zn-bearing colloids are rare in Ainai mine drain-age because the Zn concentrations are low. However, Zn-Fe layered double hydroxide (LDH) was identified and confirmed by geochemical modelling and experiments. The Zn-Fe LDH was formed by isomorphous substitution of Zn into an Fe2+-Fe3+-CO32-LDH, at pH greater than 7.5, thereby achieving efficient natural remediation of Zn and As in the drainage.
Type: article
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: 佐藤 努

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