A novel bioelectrochemical system for chemical-free permanent treatment of acid mine drainage.
Identifieur interne : 004F97 ( Ncbi/Checkpoint ); précédent : 004F96; suivant : 004F98A novel bioelectrochemical system for chemical-free permanent treatment of acid mine drainage.
Auteurs : Guillermo Pozo [Belgique] ; Sebastien Pongy [France] ; Jürg Keller [Australie] ; Pablo Ledezma [Australie] ; Stefano Freguia [Australie]Source :
- Water research [ 1879-2448 ] ; 2017.
Abstract
The mining sector is currently under unprecedented pressure due to stringent environmental regulations. As a consequence, a permanent acid mine drainage (AMD) treatment is increasingly being regarded as a desirable target with direct benefits for the environment and the operational and economic viability of the resources sector. In this study we demonstrate that a novel bioelectrochemical system (BES) can deliver permanent treatment of acid mine drainage without chemical dosing. The technology consists of a two-cell bioelectrochemical setup to enable the removal of sulfate from the ongoing reduction-oxidation sulfur cycle to less than 550 mg L(-1) (85 ± 2% removal from a real AMD of an abandoned silver mine), thereby also reducing salinity at an electrical energy requirement of 10 ± 0.3 kWh kg(-1) of SO4(2-)-S removed. In addition, the BES operation drove the removal and recovery of the main cations Al, Fe, Mg, Zn at rates of 151 ± 0 g Al m(-3) d(-1), 179 ± 1 g Fe m(-3) d(-1), 172 ± 1 g Mg m(-3) d(-1) and 46 ± 0 g Zn m(-3) d(-1) into a concentrate stream containing 263 ± 2 mg Al, 279 ± 2 mg Fe, 152 ± 0 mg Mg and 90 ± 0 mg Zn per gram of solid precipitated after BES fed-rate control treatment. The solid metal-sludge was twice less voluminous and 9 times more readily settleable than metal-sludge precipitated using NaOH. The continuous BES treatment also demonstrated the concomitant precipitation of rare earth elements together with yttrium (REY), with up to 498 ± 70 μg Y, 166 ± 27 μg Nd, 155 ± 14 μg Gd per gram of solid, among other high-value metals. The high-REY precipitates could be used to offset the treatment costs.
DOI: 10.1016/j.watres.2017.09.058
PubMed: 28987953
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In this study we demonstrate that a novel bioelectrochemical system (BES) can deliver permanent treatment of acid mine drainage without chemical dosing. The technology consists of a two-cell bioelectrochemical setup to enable the removal of sulfate from the ongoing reduction-oxidation sulfur cycle to less than 550 mg L(-1) (85 ± 2% removal from a real AMD of an abandoned silver mine), thereby also reducing salinity at an electrical energy requirement of 10 ± 0.3 kWh kg(-1) of SO4(2-)-S removed. In addition, the BES operation drove the removal and recovery of the main cations Al, Fe, Mg, Zn at rates of 151 ± 0 g Al m(-3) d(-1), 179 ± 1 g Fe m(-3) d(-1), 172 ± 1 g Mg m(-3) d(-1) and 46 ± 0 g Zn m(-3) d(-1) into a concentrate stream containing 263 ± 2 mg Al, 279 ± 2 mg Fe, 152 ± 0 mg Mg and 90 ± 0 mg Zn per gram of solid precipitated after BES fed-rate control treatment. The solid metal-sludge was twice less voluminous and 9 times more readily settleable than metal-sludge precipitated using NaOH. The continuous BES treatment also demonstrated the concomitant precipitation of rare earth elements together with yttrium (REY), with up to 498 ± 70 μg Y, 166 ± 27 μg Nd, 155 ± 14 μg Gd per gram of solid, among other high-value metals. The high-REY precipitates could be used to offset the treatment costs.</div></front></TEI><affiliations><list><country><li>Australie</li><li>Belgique</li><li>France</li></country></list><tree><country name="Belgique"><noRegion><name sortKey="Pozo, Guillermo" sort="Pozo, Guillermo" uniqKey="Pozo G" first="Guillermo" last="Pozo">Guillermo Pozo</name></noRegion></country><country name="France"><noRegion><name sortKey="Pongy, Sebastien" sort="Pongy, Sebastien" uniqKey="Pongy S" first="Sebastien" last="Pongy">Sebastien Pongy</name></noRegion></country><country name="Australie"><noRegion><name sortKey="Keller, Jurg" sort="Keller, Jurg" uniqKey="Keller J" first="Jürg" last="Keller">Jürg Keller</name></noRegion><name sortKey="Freguia, Stefano" sort="Freguia, Stefano" uniqKey="Freguia S" first="Stefano" last="Freguia">Stefano Freguia</name><name sortKey="Ledezma, Pablo" sort="Ledezma, Pablo" uniqKey="Ledezma P" first="Pablo" last="Ledezma">Pablo Ledezma</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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