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Experimental Investigation of Effective Parameters on Performance of Micro-sized Bio-electrochemical Systems

Mehran, Narges | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50017 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Yaghmaei, Soheila
  7. Abstract:
  8. This study is a report on the fabrication of a novel single-chamber micro-structure microbial fuel cell consisting of spiral anode chamber. A 3×3 cm plexiglass plate with 1 mm thickness was used as main body. A spiral microchannel (1 mm in width and 226 mm in length) was cut using a laser beam as an anodic compartment. Two types of microbial fuel cells with the same anode electrode (stainless steel mesh) and different cathode electrodes (stainless steel mesh and carbon cloth) were constructed in order to investigate the effect of cathode electrode material on microbial fuel cell performance. In both batch and continuous mode, higher power density was obtained by microbial fuel cell with carbon cloth cathode (4.2 mW/m^2 and 32.7 mW/m^2 in continuous and batch mode respectively). Due to better results of microbial fuel cell with carbon cloth cathode, other experimental tests relevant to substrate flow rate and concentration were performed with this cell. By changing the flow rate, maximum power density was observed at 500 μl/h, 800 μl/h and 500 μl/h for nutrient broth, 1.2 g/L of glucose solution and 9.3 g/L of urea solution respectively. By decreasing glucose concentration from 1.2 to 0.4 g/L , and urea concentration from 9.3 to 2.3 g/L, maximum power density declining trend was observed in both substrates. In order to run microbial electrolysis cell tests, the carbon cloth cathode was covered completely. By varying applied voltage from 400 to 800 mv and changing substrate concentration (glucose and urea) in presence of 30 kΩ resistance in circuit, the maximum produced hydrogen flow rate was observed at 800 mv of applied voltage of 0.24 (m_(H_2)^3)/(m_substrate^3 d) and 0.22 (m_(H_2)^3)/(m_substrate^3 d) for 1.2 g/L of glucose solution and 9.3 g/L of urea solution. After pure culture testes were finished, mixed culture tests were started by using anaerobic facultative sludge of municipal wastewater as microorganism and artificial wastewater as substrate. By increasing artificial waste water COD from 800 to 2000 mg/L, the maximum power density of 23.4 mW/m^2 and the maximum produced hydrogen flow rate of 0.34 (m_(H_2)^3)/(m_substrate^3 d) at COD of 1400 mg/L and flow rate of 100 μl/h were obtained
  9. Keywords:
  10. Microbial Electrolysis Cell ; Bioelectrochemical Systems ; Micro Structural Examination ; Operating Condition ; Experimental Investigation ; Single Chamber Microbial Fuel Cell

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