Bioaccumulation of metals using immobilized Zoogloea ramigera
Zoogloea ramigera, a bacterium which produces an extracellular polysaccharide, was used to develop a system which would efficiently remove a variety of metals from polluted water. The organism was grown in a defined or complex medium, immobilized in calcium-alginate, crosslinked with 1% polyethyleneimine (PEI), placed into fluidized or packed-bed reactors, and exposed to various metal solutions. The Ca-alginate immobilized Zoogloea ramigera removed 90% or more Cd from 0.5 ppm to 250 ppm metal-amended solutions. Cd alone and Cd, Sr, Mn, Cu, and Zn in mixed metal solutions was/were adsorbed at 95% efficiency or better when three fluidized-bed reactors were placed in sequence. In the same system Pb was removed at 81.3% and 74.7% when present in 10 ppm and 20 ppm solutions. Inefficiency for Pb was due to the formation of PbSO{sub 4} which resulted in the formation of an insoluble precipitate. Studies comparing ethylene oxide killed cells to live cells showed that metal binding was dependent on the presence of the extracellular polysaccharide produced by Zoogloea ramigera, and not on cellular activity.
- Research Organization:
- Oklahoma Univ., Norman, OK (USA)
- OSTI ID:
- 5599276
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ALKALINE EARTH METALS
BACTERIA
BIOLOGICAL ACCUMULATION
CADMIUM
CARBOHYDRATES
CLEANING
COPPER
DECONTAMINATION
ELEMENTS
FLUIDIZED BED REACTORS
FUEL DISPERSION REACTORS
GROWTH
HOMOGENEOUS REACTORS
IMMOBILIZED CELLS
MANGANESE
METALS
MICROORGANISMS
ORGANIC COMPOUNDS
PACKED BED
POLLUTION
POLYSACCHARIDES
REACTORS
SACCHARIDES
STRONTIUM
TRANSITION ELEMENTS
WATER POLLUTION
ZINC