Seasonal effects of natural attenuation on drainage contamination from artisanal gold mining, Cambodia: Implication for passive treatment

Tum, Sereyroith; Toda, Kanako; Matsui, Tatsuya; Kikuchi, Ryosuke; Kong, Sitha; Meas, Panha; Ear, Unsovath; Ohtomo, Yoko; Otake, Tsubasa; Sato, Tsutomu

Seasonal effects of natural attenuation on drainage contamination from artisanal gold mining, Cambodia: Implication for passive treatment

Tum, Sereyroith; Toda, Kanako; Matsui, Tatsuya et al.

Science of the total environment, 2022, 806(Part 1), 150398

Permalink : https://hdl.handle.net/2115/83053

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アクセス権	open access
URI	https://hdl.handle.net/2115/83053
タイトル	Seasonal effects of natural attenuation on drainage contamination from artisanal gold mining, Cambodia: Implication for passive treatment
著者	Tum, Sereyroith ; Toda, Kanako ; Matsui, Tatsuya ; Kikuchi, Ryosuke ; Kong, Sitha ; Meas, Panha ; Ear, Unsovath ; Ohtomo, Yoko ; Otake, Tsubasa ; Sato, Tsutomu
著者名 Tum, Sereyroith
著者名 Toda, Kanako
著者名 Matsui, Tatsuya
e-Rad_Researcher 50832854 著者名 Kikuchi, Ryosuke
著者名 Kong, Sitha
著者名 Meas, Panha
著者名 Ear, Unsovath
e-Rad_Researcher 80612902 著者名 Ohtomo, Yoko
e-Rad_Researcher 80544105 著者名 Otake, Tsubasa
e-Rad_Researcher 10313636 著者名 Sato, Tsutomu
言語	英語
キーワード	Artisanal mining
	Natural attenuation
	Passive treatment
	Seasonal dynamics
	Schwertmannite
	Arsenic
発行日	2022-02-01
出版者	Elsevier
収録物名	Science of the total environment
巻(号)	806(Part 1)
ページ	150398
抄録	In Mondulkiri province, Cambodia, artisanal gold miners dump tailings and wastewater from gold processing into a tributary of the Prek Te River. In the rainy season, heavy metal concentrations in the tributary decrease below the WHO drinking water standard levels through natural attenuation; however, this does not occur in the dry season. To further understand the natural attenuation mechanism, detailed analyses of the wastewater from tail-ing and tributary water, tributary sediments, waste rock, and ore minerals were undertaken in both seasons. The high concentration of dissolved Fe in the contaminated tributary plays a significant role in As removal during the rainy season, whereas other elements such as Ni, Se, and Cu concentration decrease due to dilution. Schwertmannite formation, controlled by iron-oxidizing bacteria, was only found at the bottom of the tributary during the rainy season. In the dry season, As, Ni, Se, and Cu concentrations remained at their original levels be-cause there was no formation of schwertmannite or dilution by rainwater. The existing schwertmannite also starts to dissolve as the pH decreases. Seasonal dynamics cause the failure of natural attenuation; thus, methods for maintaining its effectiveness in the dry season are needed. In addition, geochemical modeling was conducted to determine the significant roles of schwertmannite formation and dilution of rainwater in the tributary. Schwertmannite is a potential adsorbent for As removal from drainage. However, dilution provided indirect and direct impacts on the tributary, such as increasing the pH and diluting the concentration of toxic elements.
資源タイプ	学術雑誌論文
出版タイプ	Version of Record
権利情報	© <2022>. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/
PISSN	0048-9697
関連情報 (isIdenticalTo)	出版社版DOI https://doi.org/10.1016/j.scitotenv.2021.150398