Maximum Temperature Limits for Acidophilic, Mesophilic Bacteria in Biological Leaching Systems

Maximum temperature limits for acidophilic, mesophilic bacteria in biological leaching systems.

The maximum temperature for growth (T(max)) was determined for pure and mixed cultures of acidophilic thiobacilli. The experimental system was based on incubating the cultures in liquid media exposed to a linear temperature gradient. The T(max) values varied within the range of 36.1 to 43.6 degrees C.

Metal Leaching from Spent Petroleum Catalyst by Acidophilic Bacteria in Presence of Pyrite

This paper describes studies on the recovery of metals from spent hydro-processing catalyst using mixed acidophilic culture in presence of pyrite. This culture was initially grown in the 9K medium (absence of 9 g/L Fe(II)) where ferrous sulphate (FeSO4) was replaced by pyrite, and then applied in this bioleaching study. Bacterial action on pyrite catalysed the formation of ferric ion (Feþ3), pr...

Leaching of pyrite by acidophilic heterotrophic iron-oxidizing bacteria in pure and mixed cultures.

Seven strains of heterotrophic iron-oxidizing acidophilic bacteria were examined to determine their abilities to promote oxidative dissolution of pyrite (FeS2) when they were grown in pure cultures and in mixed cultures with sulfur-oxidizing Thiobacillus spp. Only one of the isolates (strain T-24) oxidized pyrite when it was grown in pyrite-basal salts medium. However, when pyrite-containing cu...

Effects of acidophilic protozoa on populations of metal-mobilizing bacteria during the leaching of pyritic coal

Five acidophilic protozoa (three flagellates, one ciliate and one amoeba) were isolated from acid mine water and a coal biotreatment plant, and grown in mixed cultures with acidophilic bacteria. Cultures were routinely maintained in ferrous sulphate media: in media containing pyrite or pyritic coal, protozoa grew in cultures containing coarse-grain (61-200 pm) but not fine-grain (c 61 pm) miner...

Cellulosomes from mesophilic bacteria.