Leistungsfähigkeit semi-passiver Systeme für die biologische Behandlung arsenreicher, saurer Grubenwässer: Ergebnisse von einem Jahr Monitoring an der Carnoulès Miene (Südfrankreich) - Archive ouverte HAL Access content directly
Journal Articles Mine Water and the Environment Year : 2022

Leistungsfähigkeit semi-passiver Systeme für die biologische Behandlung arsenreicher, saurer Grubenwässer: Ergebnisse von einem Jahr Monitoring an der Carnoulès Miene (Südfrankreich)

Performance of Semi-passive Systems for the Biological Treatment of High-As Acid Mine Drainage: Results from a Year of Monitoring at the Carnoulès Mine (Southern France)

Comportamiento de los sistemas semipasivos para el tratamiento biológico de los drenajes mineros con alto contenido en ácido: resultados de un año de seguimiento en la mina de Carnoulès (sur de Francia)

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Abstract

Two semi-passive treatment systems for iron (Fe) and arsenic (As) removal in AMD were installed and monitored in-situ for more than a year. These technologies were designed to treat the As-enriched AMD (≈ 1 g/L Fe(II) and 100 mg/L As(III)) of the ancient Carnoulès mine. The treatment was based on biological Fe and As oxidation by indigenous bacteria, and subse- quent immobilization of As by ferric hydroxysulfates. Forced aeration and wood/pozzolana or plastic support were used for biofilm attachment. The system performance ranged from 86 to 98% for Fe oxidation, 30 to 60% for Fe removal, and 50 to 80% for As removal at a hydraulic retention time of 9 h. No significant difference were measured between the two biofilm supports. The wood/pozzolana support had a shorter delay for performance recovery after interruptions. Iron oxidation rates were similar to those obtained in the Carnoulès AMD stream and laboratory bioreactor, while As oxidation seemed to be enhanced. The sludge accumulated between 39 and 91 mg/g of As, mainly in the As(V) oxidation state; jarosite and amor- phous ferric hydroxysulfate phases were the main Fe and As scavengers. Challenging environmental conditions during the long monitoring period confirm the robustness of the treatment units. The data will be useful in designing future full-scale treatment systems adapted to As-rich AMD.
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Dates and versions

hal-03717097 , version 1 (29-07-2022)

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Camila Diaz-Vanegas, Corinne Casiot, Lin Liming, Laurent de Windt, M. Hery, et al.. Performance of Semi-passive Systems for the Biological Treatment of High-As Acid Mine Drainage: Results from a Year of Monitoring at the Carnoulès Mine (Southern France). Mine Water and the Environment, 2022, 41, pp.679-694. ⟨10.1007/s10230-022-00885-4⟩. ⟨hal-03717097⟩
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