Extraction of Zinc from Industrial Waste by a Penicillium sp.
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Tests showed that the highest yield of solubilized zinc occurred with a 2.5% substrate (93% zinc extracted after 13 days), while the formation of citric acid by Penicillium sp.Abstract:
Zinc was extracted from a filter residue of a copper works (58.6% zinc) by a Penicillium sp. isolated from a metal-containing location. By isotachophoresis citric acid was identified as the leaching agent. Citrate was only formed when the leaching substrate was present. This production of citrate was different in several ways from that achieved by Aspergillus niger: glucose was utilized before fructose; the initial concentration of zinc was 50 to 500 times higher than usual in citrate fermentations with A. niger; citrate production stopped when 80 to 90% of the zinc was leached, although sufficient sugar for further synthesis was still present; and in synthetic media citrate production by A. niger needs an acidic environment (pH 2), while the formation of citric acid by Penicillium sp. occurred in a pH range of 7 to 4. Tests with different concentrations of waste material (0.5, 2.5, and 5%) showed that the highest yield of solubilized zinc occurred with a 2.5% substrate (93% zinc extracted after 13 days).read more
Citations
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Interactions of fungip with toxic metals
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Fungal production of citric and oxalic acid: importance in metal speciation, physiology and biogeochemical processes.
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References
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Environmental Factors that Influence the Toxicity of Heavy Metal and Gaseous Pollutants to Microorganisms
H. Babich,Guenther Stotzky +1 more
TL;DR: This review will be limited to gaseous and heavy metal pollutants, although it is clearly recognized that the toxicity of other pollutants, such as polybrominated biphenyls (PBBs) polychlorinated biphetamines (PCBs), insecticides, components of oil spills, etc., are also influenced by abiotic environmental factors.
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The effect of the sugar source on citric acid production by Aspergillus niger
TL;DR: The activity of aconitase showed a direct relationship to the citric acid production rate, and the activity was highest when sucrose was the sugar source, and lowest when galactose was the source.
Journal ArticleDOI
The citric acid fermentation by Aspergillus niger: regulation by zinc of growth and acidogenesis
William S. M. Wold,Isamu Suzuki +1 more
TL;DR: The results suggest that zinc plays a role in the regulation of growth and citric acid accumulation and Iron, manganese, calcium at concentrations as high as 5-10 muM had no influence on either growth or citrate accumulation.
Journal ArticleDOI
Leaching of a silicate and carbonate copper ore with heterotrophic fungi and bacteria, producing organic acids
Hildegard Kiel,W. Schwartz +1 more
TL;DR: Leaching of metals with carbon-heterotrophic microorganisms and organic acids as active agents has been performed with Timna copper ore containing 1.1% copper as carbonates and silicate and with some other metal oxides.