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Experimental Studies on Recovery Process of Microalgae using Electric Current and Membrane

Sabermanesh, Mohammad Hossein | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47674 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Vosughi, Manoochehr; Moslemi, Mohammad Reza
  7. Abstract:
  8. Microalgae is a major problem in water resources due to its adverse influence on water treatment process and water quality like color, odor and taste. In addition microalgae removal is an important process in food and pharmacy industry. Electrocoagulation is a potential method for microalgae removal. Another method for microalgae recovery is membrane treatment. This study is focusing on using both methods separately and simultaneously. To achieve this, the removal of Chlorella Vulgaris, a fresh water microalgae, was used in experiments. In first phase the experiments were solely on electrocoagulation and the effect of several parameters including current density, electrocoagulation duration, electrode material, settlement duration and initial pH was investigated. Then after implementing the optimum values for each parameter, in the second phase, the effect of electrocoagulation on Hollow-Fiber membrane treatment was investigated. The results of phase 1 showed that the Aluminum electrode was better than Iron electrode achieving 86 percent removal efficiency in 60 minutes. The results also illustrated that in 60-minute processes the removal efficiency for current densities of 0.5, 1, 2, 3 mA/cm2 was 45, 75, 82, 90 respectively. The optimum current density was 1 mA/cm2. Results also illustrated that with rise of the current density and EC duration, the efficiency increases. It is also indicated that initial pH has a significant effect on removal efficiency. For instance in 60-minute experiments the removal efficiency of the solutions with pH of 5, 6, 7, 8 and 9 was 88, 86, 86, 62 and 48 respectively. The experiments in phase 2 indicated that 210 minutes of electrocoagulation increased the resistance of membrane from 0.46E9 cm-1 to 1.00E9 cm-1. It also decreased the percentage of irreversible fouling to total fouling from 8.3 to 3.3, 4.9 and 5.0 in different experiments
  9. Keywords:
  10. Microalgae ; Electrocoagulation ; Membranes ; Flocculation ; Chlorelavulgaris ; Water Treatment

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