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Simultaneous removal of tetrathionate and copper from simulated acidic mining water in bioelectrochemical and electrochemical systems

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Simultaneous removal of tetrathionate and copper from simulated acidic mining water in bioelectrochemical and electrochemical systems. / Sulonen, Mira L.K.; Kokko, Marika E.; Lakaniemi, Aino-Maija; Puhakka, Jaakko A.

In: Hydrometallurgy, Vol. 176, 2018, p. 129-138.

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@article{be75957c793043608c33676fd324c7af,
title = "Simultaneous removal of tetrathionate and copper from simulated acidic mining water in bioelectrochemical and electrochemical systems",
abstract = "This study demonstrates (bio)electrochemical tetrathionate (S4O6 2 −) degradation with simultaneous elemental copper recovery from simulated acidic mining water. The effect of applied external voltage on anodic tetrathionate removal, cathodic copper removal and current density was studied using two-chamber flow-through bioelectrochemical (MEC) and abiotic electrochemical (EC) systems. At low applied cell voltages (≤ 0.5 V), the highest tetrathionate removal rate (150–170 mg L− 1 d− 1) and average current density (15–30 mA m− 2) was obtained with MEC. At applied external voltages above 0.75 V, abiotic EC provided the highest average current density (410–3600 mA m− 2). In bioelectrochemical systems, the current generation likely proceeds via intermediary reaction products (sulfide and/or thiosulfate), while in electrochemical system tetrathionate is oxidized directly on the electrode. The copper removal rates remained low (< 10 mg L− 1 d− 1) in all systems at applied cell voltages below 0.5 V, but increased up to a maximum of 440 mg L− 1 d− 1 in MEC and to 450 mg L− 1 d− 1 in EC at applied cell voltage of 1.5 V. After seven days of operation at applied cell voltage of 1.5 V, copper removal efficiency was 99.9{\%} in both MEC and EC and the average tetrathionate removal rates were 160 mg L− 1 d− 1 and 190 mg L− 1 d− 1, respectively. This study shows that by applying external voltage, tetrathionate and copper can be efficiently removed from acidic waters with bioelectrochemical and electrochemical systems.",
keywords = "Bioelectrochemical system, Copper removal, Electrochemical system, Reduced inorganic sulfur compound, Tetrathionate",
author = "Sulonen, {Mira L.K.} and Kokko, {Marika E.} and Aino-Maija Lakaniemi and Puhakka, {Jaakko A.}",
year = "2018",
doi = "10.1016/j.hydromet.2018.01.023",
language = "English",
volume = "176",
pages = "129--138",
journal = "Hydrometallurgy",
issn = "0304-386X",
publisher = "Elsevier",

}

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TY - JOUR

T1 - Simultaneous removal of tetrathionate and copper from simulated acidic mining water in bioelectrochemical and electrochemical systems

AU - Sulonen, Mira L.K.

AU - Kokko, Marika E.

AU - Lakaniemi, Aino-Maija

AU - Puhakka, Jaakko A.

PY - 2018

Y1 - 2018

N2 - This study demonstrates (bio)electrochemical tetrathionate (S4O6 2 −) degradation with simultaneous elemental copper recovery from simulated acidic mining water. The effect of applied external voltage on anodic tetrathionate removal, cathodic copper removal and current density was studied using two-chamber flow-through bioelectrochemical (MEC) and abiotic electrochemical (EC) systems. At low applied cell voltages (≤ 0.5 V), the highest tetrathionate removal rate (150–170 mg L− 1 d− 1) and average current density (15–30 mA m− 2) was obtained with MEC. At applied external voltages above 0.75 V, abiotic EC provided the highest average current density (410–3600 mA m− 2). In bioelectrochemical systems, the current generation likely proceeds via intermediary reaction products (sulfide and/or thiosulfate), while in electrochemical system tetrathionate is oxidized directly on the electrode. The copper removal rates remained low (< 10 mg L− 1 d− 1) in all systems at applied cell voltages below 0.5 V, but increased up to a maximum of 440 mg L− 1 d− 1 in MEC and to 450 mg L− 1 d− 1 in EC at applied cell voltage of 1.5 V. After seven days of operation at applied cell voltage of 1.5 V, copper removal efficiency was 99.9% in both MEC and EC and the average tetrathionate removal rates were 160 mg L− 1 d− 1 and 190 mg L− 1 d− 1, respectively. This study shows that by applying external voltage, tetrathionate and copper can be efficiently removed from acidic waters with bioelectrochemical and electrochemical systems.

AB - This study demonstrates (bio)electrochemical tetrathionate (S4O6 2 −) degradation with simultaneous elemental copper recovery from simulated acidic mining water. The effect of applied external voltage on anodic tetrathionate removal, cathodic copper removal and current density was studied using two-chamber flow-through bioelectrochemical (MEC) and abiotic electrochemical (EC) systems. At low applied cell voltages (≤ 0.5 V), the highest tetrathionate removal rate (150–170 mg L− 1 d− 1) and average current density (15–30 mA m− 2) was obtained with MEC. At applied external voltages above 0.75 V, abiotic EC provided the highest average current density (410–3600 mA m− 2). In bioelectrochemical systems, the current generation likely proceeds via intermediary reaction products (sulfide and/or thiosulfate), while in electrochemical system tetrathionate is oxidized directly on the electrode. The copper removal rates remained low (< 10 mg L− 1 d− 1) in all systems at applied cell voltages below 0.5 V, but increased up to a maximum of 440 mg L− 1 d− 1 in MEC and to 450 mg L− 1 d− 1 in EC at applied cell voltage of 1.5 V. After seven days of operation at applied cell voltage of 1.5 V, copper removal efficiency was 99.9% in both MEC and EC and the average tetrathionate removal rates were 160 mg L− 1 d− 1 and 190 mg L− 1 d− 1, respectively. This study shows that by applying external voltage, tetrathionate and copper can be efficiently removed from acidic waters with bioelectrochemical and electrochemical systems.

KW - Bioelectrochemical system

KW - Copper removal

KW - Electrochemical system

KW - Reduced inorganic sulfur compound

KW - Tetrathionate

U2 - 10.1016/j.hydromet.2018.01.023

DO - 10.1016/j.hydromet.2018.01.023

M3 - Article

VL - 176

SP - 129

EP - 138

JO - Hydrometallurgy

JF - Hydrometallurgy

SN - 0304-386X

ER -