Biological removal of carcinogenic chromium(VI) using mixed Pseudomonas strains.
The contamination of soil and wastewaters with Cr(VI) is a major problem. It has been suggested that microbial methods for Cr(VI) reduction are better than chemical methods, as they do not add other ions or toxic chemicals to the environment. In this study an aerobic reduction of Cr(VI) to Cr(III) by employing mixed Pseudomonas cultures isolated from a marshy land has been reported. The role of chromium concentration, temperature, pH and additives on the microbial reduction of Cr(VI) has been investigated. NADH was found to enhance the rate of reduction of Cr(VI). Complete reduction of chromium(VI) has been possible even at chromium(VI) concentrations of 300 ppm. Ions like SO(4)(2-) and poly-phenols inhibited the metabolic activity relating to Cr(VI) reduction. Under optimal conditions 100 mg/L of Cr(VI) was completely reduced within 180 min.
Aravindhan
Rathinam
R
Chemical Laboratory, Central Leather Research Institute, Adyar, Chennai 600 020, India.
Sreeram
Kalarical Janardhanan
KJ
Rao
Jonnalagadda Raghava
JR
Nair
Balachandran Unni
BU
D002857:Chromium / Q000032:analysis / Q000737:chemistry / Q000378:metabolism*; D052918:Environmental Restoration and Remediation / Q000379:methods*; D005419:Flavonoids; D006863:Hydrogen-Ion Concentration; D007477:Ions; D007700:Kinetics; D010087:Oxides; D010636:Phenols; D059808:Polyphenols; D011549:Pseudomonas / Q000378:metabolism*; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000032:analysis / Q000737:chemistry / Q000378:metabolism*; D013457:Sulfur Compounds; D013997:Time Factors
D005419:Flavonoids; D007477:Ions; D010087:Oxides; D010636:Phenols; D059808:Polyphenols; D012989:Soil Pollutants; D013457:Sulfur Compounds; D002857:Chromium; C405951:sulfur monoxide; C074702:chromium hexavalent ion