Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/18597
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Title

Field application of calcite Dispersed Alkaline Substrate (calcite-DAS) for passive treatment of acid mine drainage with high Al and metal concentrations

AuthorsRötting, Tobias S.; Caraballo, Manuel A.; Serrano, José A.; Ayora, Carlos CSIC ORCID; Carrera, Jesús CSIC ORCID
Issue DateJun-2008
PublisherElsevier
CitationApplied Geochemistry 23(6): 1660-1674 (2008)
AbstractPassive treatment systems are widely used for remediation of acid mine drainage (AMD), but existing designs are prone to clogging or loss of reactivity due to Al- and Fe-precipitates when treating water with high Al and heavy metal concentrations. Dispersed alkaline substrate (DAS) mixed from a fine-grained alkaline reagent (e.g. calcite sand) and a coarse inert matrix (e.g. wood chips) had shown high reactivity and good hydraulic properties in previous laboratory column tests. In the present study, DAS was tested at pilot field scale in the Iberian Pyrite Belt (SW Spain) on metal mine drainage with pH near 3.3, net acidity 1400–1650 mg/L as CaCO3, and mean concentrations of 317 mg/L Fe (95% Fe(II)), 311 mg/L Zn, 74 mg/L Al, 20 mg/L Mn, and 1.5–0.1 mg/L Cu, Co, Ni, Cd, As and Pb. The DAS-tank removed an average of 870 mg/L net acidity as CaCO3 (56% of inflow), 25% Fe, 93% Al, 5% Zn, 95% Cu, 99% As, 98% Pb, and 14% Cd, but no Mn, Ni or Co. Average gross drain pipe alkalinity was 181 mg/L as CaCO3, which increased total Fe removal to 153 mg/L (48%) in subsequent sedimentation ponds. Unfortunately, the tank suffered clogging problems due to the formation of a hardpan of Al-rich precipitates. DAS lifetime could probably be increased by lowering Al-loads.
Publisher version (URL)http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6VDG-4S0YXM7-1&_user=145085&_rdoc=1&_fmt=&_orig=search&_sort=d&_docanchor=&view=c&_acct=C000012098&_version=1&_urlVersion=0&_userid=145085&md5=6a33e9da582f968a624cc235deded7a7
URIhttp://hdl.handle.net/10261/18597
DOI10.1016/j.apgeochem.2008.02.023
ISSN0883-2927
Appears in Collections:(Geo3Bcn) Artículos

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