Sequential precipitation of Cu and Fe using a three-stage sulfidogenic fluidized-bed reactor system

Effect of hydraulic retention time on metal precipitation in sulfate reducing inverse fluidized bed reactors

“…Previous authors have used several settling tanks to separate metals based on their differences in settling rate as well as on the manipulation of other operational parameters such as the pH . Due to its configuration, the use of the IFB reactor is a step forward to this approach as it acts not only as a sulfate reducing (sulfide producing) bioreactor but also as a settler for recovery of CuS precipitates, whereas the remaining metal sulfides with higher solubility product can be recovered in subsequent settlers.…”

“…(a)) followed the solubility product order (Table ). Accordingly, CuS precipitates settle faster than other metals such as Fe and Zn, probably due to their higher tendency to agglomerate . This is because nucleation particles tend to agglomerate more in comparison with crystals, and the lower the solubility product value (Table ), the higher the number of these particles …”

Potencial do reator anaeróbio de leito fixo-estruturado e fluxo descendente para o tratamento de drenagem ácida de minas em co-digestão com vinhaça

“…Desta forma, as DAM são caracterizadas por altas concentrações de sulfato, as quais chegam a ultrapassar 2000 mg.L -1 , acidez pronunciada e elevado conteúdo de metais, tais como ferro, cobre, zinco, alumínio, chumbo e cádmio (MELLO et al, 2014;UCAR et al, 2011). A Tabela 3.1 apresenta a composição média de algumas DAM encontradas no Brasil.…”

“…Entretanto, nem sempre o processo se dá de forma satisfatória, uma vez que os metais precipitados podem permanecer retidos no material suporte, no grânulo ou biofilme, dificultando a sua recuperação (VILLA-GOMEZ et al, 2011). Algumas alternativas propostas consistem na utilização de reatores em série, os quais possibilitam a ocorrência da redução biológica do sulfato e da precipitação dos sulfetos metálicos em estágios separados (XINGYU et al, 2013;UCAR et al, 2011).…”

Mine waste or future resource? Integrating industrial ecology thinking into a mining project

“…During this period of storage, some acid mine drainage may have already occurred and some minerals irreversibly lost. It also means waste management related environmental impacts were not avoided, such as land use, energy and infrastructure requirements.One of the most common technologies related to waste re-processing in the academic literature is bioprocessing, either in a bioreactor (e.g Sánchez-Andrea et al 2014;Ucar et al 2011). or directly within the waste deposit (e.g.Dold 2008;Peek, Barnes & Tuzun 2011).…”