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Water based pH regulation cyanobacteria electrical characteristics of microbial fuel cell research

Author: WuZuoZuo
Tutor: LiXiuFen
School: Jiangnan University
Course: Environmental Engineering
Keywords: Sedimentary microbial fuel cell pH Cyanobacteria acidizing fluid Cyclic voltammetry (CV) Electron transport characteristics
CLC: TM911.4
Type: Master's thesis
Year: 2010
Downloads: 193
Quote: 0
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Abstract


Sedimentary microbial fuel cell (Sediment Microbial Fuel Cell, SMFC) is a new non-membrane microbial fuel cell (Microbial Fuel Cell, MFC) system has a simple structure, low cost, no secondary pollution, etc., only to achieve waste or waste resource utilization, and its structure is particularly suitable for polluted lakes, rivers and other bodies of water in situ remediation for electricity is not high powered underwater devices. In this study, cyanobacteria acidizing fluid as substrate, from battery performance, electrical characteristics and the anode biofilm production characteristics and other aspects discussed the cathode / anode pH on SMFC system operation characteristics, combined with cyclic voltammetry (Cyclic Voltammetry, CV ) in-depth analysis of the cyanobacterial water SMFC electron transport system characteristics, not only for cyanobacterial harmless, resources to provide a new method, but also enrich and expand the application fields of MFC, has important theoretical and practical significance. The main contents and results are as follows: (1) cathode / anode pH on SMFC system start-up and battery performance studies show that alkaline anode, cathode acidic conditions conducive SMFC electricity production. a pH of 7/7 (cathode / anode) system, the maximum power density of only 49.47mW/m2, pH 7/5.5 system, the maximum power of the lowest density of 27.65 mW/m2, and the pH of the system the maximum power 5.5/8.5 the highest density of 87.74 mW/m2. COD removal of pH on the anode system have a greater impact, but because SMFC is a complex microbial system, while there methanogenesis, fermentation processes and other related redox reaction, the power density of the battery and COD removal rate is not showed significant correlation. (2) cathode / anode pH on SMFC system electricity production characteristics of studies have shown that the cathode acidic conditions, the system can reduce ohmic losses SMFC anode alkaline electricity production can be increased thereby reducing microbial metabolic activity and activation of the anode potential resistance, and ultimately improve system power density output. 5.5/8.5 pH of the system anode potential lowest -528 mV, the cathode potential of up to 146 mV, so the battery output voltage is the highest, at 674 mV. In this case, the apparent resistance of the battery the minimum of 360Ω, the output power density maximum is 87.74 mW/m2. External resistance is large, SMFC power output (discharge) more stable. (3) cathode / anode system pH on SMFC anode biofilm characteristics of studies have shown that extracellular polymeric substances (Extracellular Polymeric Substances, EPS) anode biofilm formation and maintenance of an important role. Anode under acidic conditions, microbial resistance to external pH changes for the secretion of extracellular polysaccharides adsorb more, pH 7/5.5 system for the polysaccharide content in EPS highest 18.82mg/gVS. Anode neutral and alkaline conditions, the appropriate pH to help the growth of microorganisms on the anode surface easy to form a stable biofilm, biofilm and significantly improve the electrochemical activity of the anode, pH 5.5/8.5 system of the biomass of the anode , the amount of biofilm containing P 8.23μgP / g carbon felt. CV scanning curve of the system peak reduction peak current up to and the largest number of anode electron transfer mechanism showing diversity. SEM shows that, in this case the anode membrane bacilli, and a small amount of bacteria and filamentous bacteria. (4) combined with cyclic voltammetry electrochemical means of cyanobacterial water SMFC electron transfer system features in-depth analysis, the results showed that the electron transfer system and the current generated mainly dependent biofilm formation and direct contact with the anode to improve the system The current density output can be optimized to achieve the anode biofilm forming ability. However, cytochrome and nanowires What is the main mechanism of electron transfer, still need further study.

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CLC: > Industrial Technology > Electrotechnical > Independent power supply technology (direct power) > Chemical power sources,batteries, fuel cells > Fuel cell
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