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Choosing a Suitable Microalgae for Bioremediation of Heavy Metals Regarding Iran's Clamate

Alizadeh, Mahsa | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47751 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Yaghmaei, Soheyla
  7. Abstract:
  8. The pollution of water resources with heavy metals as a result of industrial activities threatens the lives of all living organisms. Therefore, separation of heavy metals from wastewater before entering our invironment is very important. Various chemical and physical methods such as absorption, chemical precipitation, extraction by solvent and ion exchange can be used to separate heavy metals but each of these methods have their own problems such as imperfect separation of heavy metals, need for expensive facilities and refining systems, high energy consumption and leaving pollutant residuals that need to be separated. On the other hand, the methods mentioned above can not separate heavy metals when the concentration of heavy metals is in the range of 10 to 100 milligrams per liter. Using biological methods in wastewater treatment can solve some of the problems faced in chemical and physical methods. In recent years, Using various biomass to separate heavy metals from wastewater has gained attraction. Using microorganisms like microalgae that has a great potential to separate heavy metals is very important. In this project, our aim is to isolate a Nickel-resistant microalgae from wastewater and compare its' metal absorption capacity with Chlorella Vulgaris. The effect of parameters such as temperature, initial concentration of microalgae and initial concentration of Nickel on Nickel absorption was studied. Experiments show that the initial concentration of 77.5 milligrams per liter of nickel is the optimum concentration that leads to highest absorption with both Chlorella Vulgaris and the isolated algae. Chlorella Vulgaris is more sensitive to temperature changes that the isolated microalgae and increasing the concentration of algae increases Nickel ansorption
  9. Keywords:
  10. Heavy Metals ; Bioelimination ; Microalgae ; Water Pollution

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