High efficiency reactor for the biooxidation of ferrous iron

Mazuelos, Alfonso; Carranza, Francisco; Palencia, I.; Romero, R.

doi:10.1016/s0304-386x(00)00141-9

Cited by 48 publications

(29 citation statements)

References 7 publications

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“…Active bioreactors can also effectively oxidize Fe(II) and remove Fe(T) from solution and are considerably more effective than passive systems on a space basis. Acidophilic Fe(II) oxidizers Acidithiobacillus spp., Leptospirillum spp., and Ferrovum myxofaciens have all been enriched in both fixed-film and suspended-growth laboratory-scale bioreactors for AMD treatment (39)(40)(41)(42). Natural, mine-impacted microbial communities dominated by Ferrovum myxofaciens and Gallionella-related strains were also enriched in pilot-scale bioreactors (33,43,44).…”

mentioning

confidence: 99%

Geochemical and Temporal Influences on the Enrichment of Acidophilic Iron-Oxidizing Bacterial Communities

Sheng

Bibby

Grettenberger

et al. 2016

Appl Environ Microbiol

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Two acid mine drainage (AMD) sites in the Appalachian bituminous coal basin were selected to enrich for Fe(II)-oxidizing microbes and measure rates of low-pH Fe(II) oxidation in chemostatic bioreactors. Microbial communities were enriched for 74 to 128 days in fed-batch mode, then switched to flowthrough mode (additional 52 to 138 d) to measure rates of Fe(II) oxidation as a function of pH (2.1 to 4.2) and influent Fe(II) concentration (80 to 2,400 mg/liter). Biofilm samples were collected throughout these operations, and the microbial community structure was analyzed to evaluate impacts of geochemistry and incubation time. Alpha diversity decreased as the pH decreased and as the Fe(II) concentration increased, coincident with conditions that attained the highest rates of Fe(II) oxidation. The distribution of the seven most abundant bacterial genera could be explained by a combination of pH and Fe(II) concentration. Acidithiobacillus, Ferrovum, Gallionella, Leptospirillum, Ferrimicrobium, Acidiphilium, and Acidocella were all found to be restricted within specific bounds of pH and Fe(II) concentration. Temporal distance, defined as the cumulative number of pore volumes from the start of flowthrough mode, appeared to be as important as geochemical conditions in controlling microbial community structure. Both alpha and beta diversities of microbial communities were significantly correlated to temporal distance in the flowthrough experiments. Even after long-term operation under nearly identical geochemical conditions, microbial communities enriched from the different sites remained distinct. While these microbial communities were enriched from sites that displayed markedly different field rates of Fe(II) oxidation, rates of Fe(II) oxidation measured in laboratory bioreactors were essentially the same. These results suggest that the performance of suspended-growth bioreactors for AMD treatment may not be strongly dependent on the inoculum used for reactor startup. IMPORTANCEThis study showed that different microbial communities enriched from two sites maintained distinct microbial community traits inherited from their respective seed materials. Long-term operation (up to 128 days of fed-batch enrichment followed by up to 138 days of flowthrough experiments) of these two systems did not lead to the same, or even more similar, microbial communities. However, these bioreactors did oxidize Fe(II) and remove total iron [Fe(T)] at very similar rates. These results suggest that the performance of suspended-growth bioreactors for AMD treatment may not be strongly dependent on the inoculum used for reactor startup. This would be advantageous, because system performance should be well constrained and predictable for many different sites. N iche models use environmental and geochemical information to explain and predict the composition and diversity of microbial communities. In these models, different geochemical conditions act as key niche parameters controlling microbial community composition. For example, pH (1-4),...

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mentioning

confidence: 99%

Geochemical and Temporal Influences on the Enrichment of Acidophilic Iron-Oxidizing Bacterial Communities

Sheng

Bibby

Grettenberger

et al. 2016

Appl Environ Microbiol

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“…A 40 mm high empty space separated each floor from the next one. These empty spaces had three holes for sampling and for possible additions of acid and oxygen (Mazuelos et al, 2000). The packing of each floor was supported by plastic screens.…”

Section: Reactor Systemmentioning

confidence: 99%

Using biochemical system to improve cinnabar dissolution

Wang

et al. 2013

Bioresource Technology

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“…En relación a la etapa de biooxidación, el diseño de biorreactores es un tema que está siendo ampliamente estudiado en los últimos años [13][14][15] , por lo que este trabajo se atendrá, fundamentalmente, al apartado de lixiviación férrica. El tipo de biorreactor que da lugar a las mayores productividades, cumpliendo los requisitos antes citados, es el lecho fijo inundado [13] .…”

Section: I In Nt Tr Ro Od Du Uc Cc Ci Ió óN Nunclassified

“…El tipo de biorreactor que da lugar a las mayores productividades, cumpliendo los requisitos antes citados, es el lecho fijo inundado [13] . Se trata de un reactor continuo de lecho fijo, constituido por partículas discretas de un material inerte sobre las que se soporta la biomasa ferrooxidante (Acidithiobacillus ferrooxidans y Leptospirillum ferrooxidans) formando biopelículas.…”

Section: I In Nt Tr Ro Od Du Uc Cc Ci Ió óN Nunclassified

Recuperación de cobre en escorias mediante biolixiviación indirecta

Mazuelos¹,

Iglesias²,

Romero³

et al. 2009

Rev. metal.

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R Re ec cu up p e er r a ac ci io o n n d d e e c co o b b r re e e en n e es sc co o r ri ia as s m m e ed d i ia an n t te e b bi i o ol l i ix xi iv v i ia ac ci i ó ón n i in nd di ir re ec ct ta a ( (• •) )A. Mazuelos * , N. Iglesias * , R. Romero ** , O. Forcat * y F. Carranza * R Re es su um me en n En los procesos pirometalúrgicos, parte del cobre se pierde en la escoria que se genera como residuo del proceso, pudiendo estar presente en ella, en concentraciones muy superiores a las de muchas menas. El cobre se encuentra formando parte de pequeñas partículas de mata, metal blanco y blister, ocluidas en fase de fayalita. En este trabajo se ha probado la viabilidad técnica del proceso BRISA, que está basado en la biolixiviación indirecta, para el tratamiento de este residuo. Se ha caracterizado una escoria con un 2 % en cobre, desde los planos químico, granulométrico y metalográfico. Este material se ha lixiviado con disoluciones de sulfato férrico en reactores agitados, estudiándose el efecto de diversas variables. A partir de los resultados obtenidos, e incluyendo un estudio económico, con resultados muy atractivos, se han seleccionado las mejores condiciones de operación y se ha diseñado la etapa de lixiviación para una planta de 30 t/h de capacidad. En esta planta sería posible alcanzar extracciones de cobre superiores al 70 % con un tiempo de residencia de sólo 5 h. La etapa de biooxidación suministraría el férrico necesario pese a haber presente Cu(II) en el circuito en concentraciones de hasta 30 g/l. P Pa al la ab br ra as s c cl la av ve eEscoria; Biolixiviación indirecta; Proceso BRISA; Lixiviación férrica; Sulfuros de Cobre.C Co op pp pe er r r re ec co ov ve er ry y f fr ro om m s sl la ag g b by y i in nd di ir re ec ct t b bi io ol le ea ac ch hi in ng g A Ab bs st tr ra ac ct tThe main source of copper loss from a smelter is copper in discard slag. Slag can contain Cu in concentrations very much higher than those of many ores. Cu is present in slag entrained in very small drops of matte, white metal and blister copper occluded in fayalitic phase. In this work, the technical viability of the BRISA process, that is based on the indirect bioleaching, for this residue has been proved. A sample of slag, containing 2 % of copper, has been chemical, granulometrical and metallographic characterized and it has been leached with ferric sulphate solutions in agitated reactors. The influence of several variables have been investigated. Once the best operating conditions had been selecting and an economic estimation had been done (with very really attractive results), the leaching stage has been designed for a plant of 30 tonnes per hour capacity. Cu extractions higher than 70% can be achieved with a residence time of only five hours. Despite of Cu(II) concentration in fed is as high as 30 g/l, biooxidation stage can supply Fe(III) demanded by ferric leaching stage. K Ke ey yw wo or rd ds sCopper-slag; Indirect bioleaching; BRISA process; Ferric leaching; Copper sulphides. REVISTA DE METALURGIA, 45 (2)

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High efficiency reactor for the biooxidation of ferrous iron

Cited by 48 publications

References 7 publications

Geochemical and Temporal Influences on the Enrichment of Acidophilic Iron-Oxidizing Bacterial Communities

Geochemical and Temporal Influences on the Enrichment of Acidophilic Iron-Oxidizing Bacterial Communities

Using biochemical system to improve cinnabar dissolution

Recuperación de cobre en escorias mediante biolixiviación indirecta

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