Hexavalent chromate reduction by immobilized Streptomyces griseus.
Hexavalent chromium, which is a mutagen and carcinogen, was efficiently reduced by Streptomyces griseus. This activity was associated with the cell. Cr(6+) reduction by free as well as immobilized cells was studied: cells in PVA-alginate had the highest (100%) Cr(6+) removal efficiency in 24 h with reduction rates similar to free cells. Immobilized cells completely reduced 25 mg Cr(6+) l(-1) in 24 h. PVA-alginate immobilized cells could be reused four times to completely reduce 25 mg Cr(6+) l(-1) in 24 h each time. Chromate in a simulated effluent containing Cu(2+), Mg(2+), Mn(2+) and Zn(2+) was completely reduced by PVA-alginate immobilized cells within 9 h.
Poopal
Ashwini C
AC
Division of Biochemical Sciences, National Chemical Laboratory, Pune, 411008, India.
Laxman
R Seeta
RS
D000180:Acrylic Resins; D000362:Agar; D000464:Alginates; D018914:Cells, Immobilized / Q000378:metabolism; D002857:Chromium / Q000378:metabolism*; D003470:Culture Media; D020723:Glucuronic Acid; D006603:Hexuronic Acids; D008863:Microspheres; D010084:Oxidation-Reduction; D011142:Polyvinyl Alcohol; D012685:Sepharose; D013305:Streptomyces griseus / Q000166:cytology / Q000378:metabolism*; D000099166:Polyacrylamides
D000180:Acrylic Resins; D000362:Agar; D000464:Alginates; D002857:Chromium; D003470:Culture Media; D020723:Glucuronic Acid; D006603:Hexuronic Acids; D011142:Polyvinyl Alcohol; D012685:Sepharose; D000099166:Polyacrylamides; C074702:chromium hexavalent ion