| Summary: | 碩士 === 康寧大學 === 休閒資源暨綠色產業研究所 === 101 === This study aimed to build a microbial fuel cell (MFC) system and to perform tests in three sets of environments with different cathode chambers and anode chambers: (1) the anode chamber contained strict anaerobes and the cathode chamber contained Nannochloropsis oculate; (2) the anode chamber contained Aurantiochytrium sp. and the cathode chamber contained buffer solution; and (3) the anode chamber contained Aurantiochytrium sp. and the cathode chamber contained Nannochloropsis oculate. There were a total of nine testing procedures.
The results of the experiments: (1) for the two systems with the cathode chamber containing Nannochloropsis oculate, if the anode chamber contained strict anaerobes, the maximum power density PDmax and the CE value of the MFC system were 41.5mW/m2 and 1.795%, respectively, when the resistance reached 220Ω. And while the anode chamber contained Aurantiochytrium sp., the maximum power density PDmax and the CE value of the MFC system were 22.0mW/m2 and 1.035%, respectively, when the resistance reached 330Ω. The results of the two systems were in inverse proportion due to the different species in the anode chamber. In the case with the anode chamber containing strict anaerobes, low resistance lead to maximum power density. On the other hand, in the case with the anode chamber containing Aurantiochytrium sp., high resistance lead to maximum power density; (2) Comparing the cases with the anode chamber containing Aurantiochytrium sp., if the cathode chamber contained buffer solution, the maximum power density PDmax and the CE value of the MFC system were 34.9mW/m2 and 1.302%, respectively, when the resistance reached 510Ω. In these cases with the anode chamber containing Aurantiochytrium sp., the two MFC systems with different cathode chamber environments reached maximum power density with high resistances.
The micro algae growth rates in the cathode chambers of the MFC systems with high resistances (0.0453hr-1 and 0.1038hr-1) were higher than with low resistances (0.0383 hr-1 and 0.0892 hr-1). The differences in COD removal efficiencies of the MFC systems in different experiments were significant. In Part I, when the anode chamber contained strict anaerobes, the corresponding COD removal efficiency was over 95%. In Part II and Part III, the anode chamber contained Aurantiochytrium sp., and the corresponding COD removal efficiencies were must lower than Part I. In Part II, the COD removal efficiency was over 75%, and in Part III above 85%. Therefore, the removal efficiency with the anode chamber containing strict anaerobes was much higher than that with the anode chamber containing Aurantiochytrium sp.. And placing Nannochloropsis oculate in the cathode chamber could efficiently improve the COD removal efficiency of the MFC system.
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