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Sulfate removal from mine-impacted water by electrocoagulation: statistical study, factorial design, and kinetics

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Abstract

This work aimed to remove sulfate and acidity from mine-impacted water (MIW) via electrocoagulation (EC), a technique which stands as an advanced alternative to chemical coagulation in pollutant removal from wastewaters. The multiple electrochemical reactions occurring in the aluminum anode and the stainless steel cathode surfaces can form unstable flakes of metal hydroxysulfate complexes, causing coagulation, flocculation, and floatation; or, adsorption of sulfate on sorbents originated from the electrochemical process can occur, depending on pH value. Batch experiments in the continuous mode of exposition using different current densities (35, 50, and 65 A m−2) were tested, and a statistical difference between their sulfate removals was detected. Furthermore, the intermittent mode of exposure was also tested by performing a 22-factorial design to verify the combination with different current densities, concluding that better efficiencies of sulfate removal were obtained in the continuous mode of exposition, even with lower current densities. After 5 h of electrocoagulation, sulfate could be removed from MIW with a mean efficiency of 70.95% (in continuous mode of exposition and 65 A m−2 current density), and this sulfate removal follows probable third-order decay kinetics in accordance with the quick drop in sulfate concentration until 3 h of exposure time, remaining virtually constant at longer times.

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Abbreviations

AMD:

acid mine drainage

ANOVA:

analysis of variance method

EC:

electrocoagulation

MAV:

maximum allowed value

MIW:

mine-impacted water

SD:

standard deviation

SRB:

sulfate-reducing bacteria

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Authors and Affiliations

  1. Department of Environmental Engineering, Federal University of Santa Catarina (UFSC), Campus Reitor João David Ferreira Lima, Trindade, Florianópolis, SC, 88040-900, Brazil

    Caroline Rodrigues, Hioná V. Dal Magro Follmann, Dámaris Núñez-Gómez, Maria Eliza Nagel-Hassemer, Flávio R. Lapolli & María Ángeles Lobo-Recio

  2. Department of Energy and Sustainability, UFSC, Campus Araranguá, Rod. Gov. Jorge Lacerda,3201, Jardim das Avenidas, Araranguá, SC, 88906-072, Brazil

    María Ángeles Lobo-Recio

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  1. Caroline Rodrigues
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  2. Hioná V. Dal Magro Follmann
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  3. Dámaris Núñez-Gómez
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  4. Maria Eliza Nagel-Hassemer
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  5. Flávio R. Lapolli
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  6. María Ángeles Lobo-Recio
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Contributions

Caroline Rodrigues has contributed for the conceptualization, methodology, investigation, writing the original draft, and review and editing the manuscript; Hioná V. Dal Magro Follmann for the software, investigation, and formal analysis; Dámaris Núñez-Gómez for the conceptualization, methodology, and writing the original draft; Maria Eliza Nagel-Hassemer for writing, reviewing, and editing; Flávio R. Lapolli for project administration and funding acquisition; and María Ángeles Lobo-Recio for the conceptualization, supervision, writing, reviewing, and editing.

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Correspondence to Caroline Rodrigues.

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Rodrigues, C., Follmann, H.V., Núñez-Gómez, D. et al. Sulfate removal from mine-impacted water by electrocoagulation: statistical study, factorial design, and kinetics. Environ Sci Pollut Res 27, 39572–39583 (2020). https://doi.org/10.1007/s11356-020-09758-1

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