Hexavalent Chromium Reduction: Relevant Research

Hexavalent Chromium Reduction: Relevant Research

1. Bioremediation of Hexavalent Chromium Widely Discharged in Leather Tanning Effluents

   • Environmental Problems
     • Release of chrome salts into the environment
   • Hexavalent chromium removal
     • 97.2% during 96 hours of incubation in the laboratory
   • Methodology used
     • Isolation and selection of strains with high chromium reduction capacity and gene analysis
   • Type of microorganism
     • Strain CR-1 is a Gram-negative spiral bacterium with no spores and polar flagella and exhibits strictly anaerobic growth

2. Treatment of high-concentration chromium-containing wastewater by sulfate-reducing bacteria acclimated with ethanol

   • Environmental Problems
     • Industrial wastewater from metallurgy, metal processing and electroplating, among others.
   • Methodology used
     • Spectrophotometric method of diphenylcarbohydrazide
   • Hexavalent chromium removal
     • Strain (CR-1) with chromium reducing capacity of 500 mg/L Cr(VI). 1:5 ratio
   • Type of microorganism
     • Microbacterim SPP

3. Chromate Tolerance and Removal of Bacterial Strains Isolated from Uncontaminated and Chromium-Polluted Environments.

   • Environmental Problems
     • Environmental contamination by hexavalent chromium
   • Methodology used
     • Spectrophotometric method
   • Hexavalent chromium removal
     • NCr1a and PCr12 strains exhibited high chromate removal activity (73.7% and 74.4%, respectively).
   • Type of microorganism
     • Group Bacillus cereus . B. cereus

4. Identification of the Main Mechanisms Involved in the Tolerance and Bioremediation of Cr(VI) by Bacillus Sp. SFC 500-1E

   • Environmental Problems
     • Chromium from discharges into surface waters.
   • Methodology used
     • Biochemical tests and spectrophotometer
   • Hexavalent chromium removal
     • SFC 500-1 was able to remove phenol at environmentally relevant concentrations (1000 mg l(-1) ) and reduce Cr (VI) to Cr (III), which was immobilized in the bacterial biomass.
   • Type of microorganism
     • Acinetobacter and Bacillus genus

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