If you have acid resistance and acidophilic bacteria both in order to treat acidic wastewater containing heavy metal ions. what do you think which one would you prefer pls explain in brief?
Dear Himanshu,
Microbial solubilizing of metals in acid environments is successfully used in industrial bioleaching of ores or biomining to extract metals such as copper, gold, uranium and others. This is done mainly by acidophilic and other microorganisms that mobilize metals and generate acid mine drainage or AMD, causing serious environmental problems. However, bioremediation or removal of the toxic metals from contaminated soils can be achieved by using the specific properties of the acidophilic microorganisms interacting with these elements.
http://www.scielo.cl/scielo.php?pid=S0716-97602013000400008&script=sci_arttext
In addition, you can read the following paper entitled "The adaptation of gram-negative bacteria to acidic environmental conditions with implication in heavy metals removal processes " published in Romanian Biotechnological Letters Vol. 16, No.6, 2011, Supplement which describes the biosorption of heavy metals by some microorganisms:
Bacteria that live in acidic environments are very important for industrial biotechnology. The physiological, biochemical and ecological studies, including the isolation of new acidophilic heterotrophic bacteria, will allow a better understanding of their signification for biodiversity and bioremediation. The aim of the present paper was to study the biosorption of heavy metallic ions by 8 strains and 3 populations of aerobe heterotrophic bacteria. They presented a maximum activity of
acidophilic heterotrophic populations at acidity and temperature values close to the physico-chemical properties of habitats from which they were taken. The use of silicagel, zeolite and molecular sieve was proved efficient in the immobilization of neutrophilic and acidophilic heterotrophic bacteria by accentually decreasing of the optical density of cultures. Also, higher percentages biosorption of several metallic ions were obtained using populations of acidophilic bacteria compared with purified
strains, which confirms the adaptation of populations to higher concentrations of Cu2+ (68%), Zn2+ (80%) and Ni2+ (84%). In the experiments of the chromium removal from industrial waste water by the acidophilic heterotrophic bacterial strains an extraction of the hexavalent chrome of 86.78 - 99.95% was noticed. The same experiments evidenced the fact that Cr3+ and Cr6+ were removed in bigger
percentages (73.33% and 94.07%) after 48 hours contact between neutrophilic bacterial population and industrial waste water.
http://www.rombio.eu/rbl6vol16Supplement/2%20Cismasiu%20Carmen%20Madalina.pdf
Rafik
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