CONTINUOUS REMOVAL OF ARSENIC USING A DHS REACTOR WITH ARSENITE-OXIDIZING BACTERIA
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- SEGAWA Nami
- 岩手大学大学院工学研究科社会環境工学専攻
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- KANNO Kento
- 岩手大学工学部社会環境工学科
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- ISHIKAWA Nao
- 岩手大学工学部社会環境工学科
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- ITO Ayumi
- 岩手大学大学院工学研究科フロンティア材料機能工学専攻
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- NAKAMURA Kanji
- 東北学院大学工学部環境建設工学科
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- UMITA Teruyuki
- 岩手大学工学部社会環境工学科
Bibliographic Information
- Other Title
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- 亜ヒ酸酸化能を有する細菌群を用いたヒ素の連続除去処理
- アヒサン サンカノウ オ ユウスル サイキングン オ モチイタ ヒソ ノ レンゾク ジョキョ ショリ
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Abstract
The health impairment caused by ingestion of the arsenic in groundwater is serious especially in Asian areas. Ferrous iron (Fe (II)) is detected in groundwater with arsenic. In order to improve the efficiency of coagulation or adsorption process for arsenic removal, arsenite (As (III)) which is a predominant form in groundwater needs to be oxidized to arsenate (As (V)) as a pretreatment. In this research, arsenite-oxidizing bacteria are enriched from activated sludge, then 16S rRNA gene analysis was conducted. Arsenite oxidization characteristics under different culture conditions (DO, pH, and temperature) were examined and the optimum conditions of pH and temperature were 7 and 30°C, respectively. For the purpose of developing an economical arsenic removal method without an aeration equipment, an oxidizer, and a flocculant, a Down-Flow Hanging Sponge (DHS) reactor with fixed arsenite-oxidizing bacteria was examined. As a result, when the inflow concentrations of As (III) and Fe(II) were 0.5 mg/L and 25 mg/L, respectively, the average arsenic removal efficiency was about 95 %. This efficiency was correspondent to the water quality standard for drinking water value of 0.01 mg/L.
Journal
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- Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research)
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Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research) 70 (7), III_535-III_542, 2014
Japan Society of Civil Engineers