Ecological Study of Some Factors effect on Bioremoval of chromium by microbial isolates.

N. Al-Azzawi, Muhammed

	Ecological Study of Some Factors effect on Bioremoval of chromium by microbial isolates.
journal of al-qadisiyah for pure science(quarterly)
Article 1, Volume 9, Issue 1, 2009, Pages 107-123 PDF (0 K)
Author
Muhammed N. Al-Azzawi
Abstract
Four samples were collected from waste water of Tannery factory , as triplicates , within a month. Chemicals and physical measurements where carried out on these samples , included : Do , BOD , TSS , TDS and chromium concentration. Four bacterial isolated had been isolated from the Tannery factory : Proteus vulgaris 1C , Staphylococcus aureus 2C , Pseudomonas aeroginosa 3C , Escherichia coli 4C. P. aeruginosa 3C was the most efficient in bioremoval of chromium from its aqueous solution in average of (132 ± 5.4) mg / ml and removal percentage reached (90.5 %). Markedly , bacteria isolated characterized by a dominance of gram negative bacteria over the gram positive. In relation to metal resistance P. aeruginosa 3C showed the lowest chromium resistance level UP to (1900) mg / L whereas S. aureus 2C showed the highest level among other isolates reached (5100) mg / L. It was noted that temperature and pH had a significant effect on metal biosorption by bacteria isolated. On contrary time of contact did not significant effect the amount of biosorped metal. The present study established a reverse relationship between the amount of biosorped metal and its tolerance level. Since the most efficient isolates P. aeruginosa 3C. Furthermore P. aeruginosa 3C succeeded in remove approximately all chromium ions from the sample taken from Tannery waste water.

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