Pyrite biomining proficiency of sulfur dioxygenase (SDO) enzyme extracted from Acidithiobacillus thiooxidans

2021 ◽  
Vol 111 ◽  
pp. 207-212
Author(s):  
Mathiyazhagan Narayanan ◽  
Devarajan Natarajan ◽  
Sabariswaran Kandasamy ◽  
Arunachalam Chinnathambi ◽  
Sulaiman Ali Alharbi ◽  
...  
2017 ◽  
Vol 24 (24) ◽  
pp. 20082-20092 ◽  
Author(s):  
Hugo Ramírez-Aldaba ◽  
Jorge Vazquez-Arenas ◽  
Fabiola S. Sosa-Rodríguez ◽  
Donato Valdez-Pérez ◽  
Estela Ruiz-Baca ◽  
...  

2021 ◽  
Author(s):  
Ling Tan ◽  
Thomas Jones ◽  
Jianping Xie ◽  
Xinxing Liu ◽  
Gordon Southam

Abstract Weathering of the Merensky reef was enhanced under laboratory conditions by Fe- and S-oxidizing bacteria: Acidithiobacillus ferrooxidans, Acidithiobacillus thiooxidans, and Leptospirillum ferrooxidans. These bacteria preferentially colonized pyrrhotite and pyrite, versus pentlandite and chalcopyrite (all of which were common within the rock substrate), promoting weathering. Weathering of base metal sulfides resulted in the precipitation of Fe oxides, Fe phosphate, and elemental sulfur as secondary minerals. Fe pyroxene weathered readily under acidic conditions and resulted in mineral dissolution, while other silicates (orthopyroxene and plagio-clase) precipitated Fe phosphate spherules or coatings on their surface. The deterioration of the platinum group metal (PGM) matrix (base metal sulfides and silicates) and the occurrence of a platinum grain associated with platinum nanoparticles observed in the biotic thin sections demonstrate that biogeochemical acid weathering is an important step in the active release of intact PGM grains. A platinum grain embedded in secondary Fe oxides/phosphate that had settled by gravity within the weathering solution demonstrates that secondary minerals that formed during weathering of PGM-hosting minerals also represent targets in PGM exploration by trapping and potentially slowing PGM migration. Dispersion halos surrounding or occurring downstream from PGM occurrences will likely produce two physical target classes—i.e., grains and colloids—under surficial weathering conditions.


2018 ◽  
Vol 45 ◽  
pp. 00021 ◽  
Author(s):  
Vlasta Ondrejka Harbulakova ◽  
Adriana Estokova ◽  
Alena Luptakova

Vegetation and microorganisms present the biological factors that deteriorate concrete. These problems are very visible in places like sewage, underground and hydraulic structures, chemical plants, industrial structures, liquid-containing structures, agricultural structures or marine environments. The most significant biodeteriogens are the sulphur-oxidising bacteria Acidithiobacillus thiooxidans (A. thiooxidans) and the sulphatereducing bacteria (Desulfovibrio spp.) that are responsible for the so-called sulphuretum consortium. Microorganisms that produce sulphuric acid accelerate the deterioration of concrete sewer pipes in a process termed Microbially Induced Concrete Corrosion (MIC). The paper considers the assessment of the release of calcium and silicon from concrete composites with and without coal fly ash by sulphur-oxidizing bacteria. The concrete mixture contained coal fly ash as 5 wt. % and wt. 10 % cement replacement. Prepared composites were exposed to an aggressive microbial environment under laboratory conditions for 3 months. The pH values were measured and studied during this time period. A different resistance against MIC was observed for the concrete composites of different compositions. The highest amount of calcium leached-out from the concrete was in the case of the composites where 10 % cement was replaced by fly ash.


2019 ◽  
Vol 132 ◽  
pp. 69-75 ◽  
Author(s):  
Patrícia Cardoso Matias ◽  
Edson Marcio Mattiello ◽  
Wedisson Oliveira Santos ◽  
Jorge Luis Badel ◽  
Víctor Hugo Alvarez V.

Author(s):  
Gerardo Andrés Caicedo Pineda ◽  
Marco Antonio Márquez Godoy

<p>Se llevaron a cabo procesos de biodesulfurización de dos carbones colombianos ricos en azufre (“Mina Vieja” y “Vampiro”), en reactores de lecho empacado a nivel de erlenmeyer, utilizando un consorcio de Acidithiobacillus ferrooxidans (ATCC 23270) y Acidithiobacillus thiooxidans (ATCC 15494), evaluando la adición de cisteína a la solución lixiviante. Los ensayos fueron monitoreados por medidas de hierro en solución, pH y potencial redox. Adicionalmente, se hicieron análisis mineralógicos por difracción de rayos X (DRX) antes y después de los experimentos. Los ensayos sin adición de cisteína alcanzaron una oxidación de pirita de 45.3% y 57.9% para “Mina Vieja” y “Vampiro” respectivamente. Cuando se adicionó cisteína, la oxidación aumentó en 14.9% para “Mina Vieja” y 6.4% para “Vampiro”. Por otra parte, todos los ensayos evidenciaron remoción de caolinita, debido a su interacción con el ácido sulfúrico del medio. Con base en los resultados obtenidos, los componentes del carbón influenciaron tanto crecimiento bacteriano como la eficiencia de la cisteína sobre el grado de pirita oxidada.</p>


2017 ◽  
Vol 34 (1) ◽  
pp. 119-129 ◽  
Author(s):  
P. F. Ferreira ◽  
E. F. C. Sérvulo ◽  
A. C. A. da Costa ◽  
D. M. Ferreira ◽  
M. L. D. P. Godoy ◽  
...  

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