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Biological Treatment of Drug Wastewater with Focus on Cyanide Compound

Moradkhani, Mahboobeh | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45451 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Yaghmaei, Soheyla; Rustaazad, Reza
  7. Abstract:
  8. HCN is a highly valuable precursor to many chemical compounds ranging from polymers to pharmaceutical. Although cyanide can be destroyed and recovered by several processes, it is still widely discussed and examined due to its potential toxicity and environmental impact. The treatment methods for cyanide in common use today are physicochemical processes which have high operating costs and also produce chemical waste. Recently, biological processes have been studied because they are inexpensive and no effect to the environment. Therefore to achieve this object, Stimulation of indigenous microorganisms for waste degradation is a common technology. The process effluent from the gold extraction plant contains high amounts of cyanide; So in this study, the ability of isolated microorganisms from soil sample of Takab gold mine in treating cyanide were investigated. Four bacteria (M1-M4) which utilize cyanide as a Nitrogen source were isolated after enrichment in a liquid medium containing potassium cyanide and glucose under alkaline on i ion Mi oo ani e e in a e a 30 C and PH=10-10.5 on a rotary shaker (150rpm). The isolated bacterial strains were investigated through variety of bacteriological and biochemical tests as well as standard tests such as gram stain, colony morphology and also in soil sample the cyanide biodegradation. Our results indicate that microorganism M3 was the best strain which tolerates 500ppm cyanide and degrades 93.5% of it within thirteen days
  9. Keywords:
  10. Cyanide ; Biological Treatment ; Soil ; Microorganisms

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