不同底物对微生物燃料电池产电影响及电能收集研究

发布时间：2018-02-26 03:33

本文关键词： 微生物燃料电池底物电化学反应电能管理系统　出处：《天津工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：微生物燃料电池(Microbial fuel cell,MFC)是利用微生物作为催化剂降解底物产生电能的生物处理技术,可以实现废水能源化。针对不同水质及负荷下MFC产电性能的差异,本文采用不同废水作为MFC的底物进行产电研究,为产电优化提供理论依据;针对电能低难于利用问题,本文采用电能管理系统(Power management system,PMS)收集MFC的电能,为MFC实用化技术提供新的解决方案。本文研究了人工配水、生活污水、啤酒废水对MFC产电性能的影响:包括底物对MFC启动期产电性能、COD去除率和库伦效率(Coulombic efficiency,CE)、电极电位、动力学过程、极化曲线和功率密度的影响,然后通过PMS收集MFC电能,实现间歇高电压、高功率输出。主要结论如下:(1)人工配水、生活污水、啤酒废水均可以启动MFC,稳定电压依次为0.60V、0.56V、0.44V。底物种类、电导率对启动期稳定电压有影响。以人工配水为对照,生活污水电导率高,电荷转移内阻、溶液内阻小,底物利用率高,电压与人工配水相当。啤酒废水电导率低,电荷转移内阻、溶液内阻大,底物利用率低,电压低于人工配水。(2)底物COD浓度对MFC产电性能有影响。底物浓度增加时,产电微生物活性增强,阳极氧化电位降低,阴极还原电位升高,总电位增加,氧化还原能力增强,底物利用率高。浓度变化时,阳极电位增幅大于阴极电位增幅,阳极电位是影响MFC产电的主要因素。(3)底物种类、电导率与MFC产电性能有着密切的关系。以人工配水为对照,生活污水MFC的COD去除率高,底物利用率高,溶液传质内阻小,产电能力高,溶液中传质是影响产电的主要因素;啤酒废水MFC的COD去除效率低,底物利用率低导致电荷转移内阻大,电导率低引起溶液内阻大,溶液中传质、电极表面的电化学反应是影响产电的主要因素。(4)采用PMS后,MFC的放电电压范围为1.60-2.00V,输出功率范围为2.56-4.00mW,为扩大MFC的应用范围、较低电压输出的问题提供了解决方案。
[Abstract]:Microbial fuel cell (MFCs) is a biological treatment technology that uses microorganism as a catalyst to degrade the substrate to produce electric energy, which can realize the energy conversion of wastewater. According to the difference of electric performance of MFC under different water quality and load, In this paper, different waste water is used as the substrate of MFC to study power generation, which provides the theoretical basis for power generation optimization. In order to solve the problem of low and difficult utilization of electric energy, the power management system is used to collect the electric energy of MFC. In this paper, the effects of artificial water distribution, domestic sewage and beer wastewater on the electrical properties of MFC were studied, including the removal rate of MFC and Coulombic efficiency of Coulombic efficiency and electrode potential. Dynamic process, polarization curve and influence of power density, and then collect MFC electric energy through PMS to realize intermittent high voltage and high power output. The main conclusions are as follows: 1) artificial water distribution, domestic sewage, All the beer wastewater can start MFC, and the stable voltage is 0.60V / 0.56V / 0.44V. the type of substrate and the conductivity have influence on the stable voltage during start-up. Compared with artificial water, domestic sewage has high conductivity, charge transfer resistance, low internal resistance of solution and high utilization of substrate. The voltage is equivalent to that of artificial water. Beer wastewater has low conductivity, charge transfer resistance, large solution resistance, low substrate utilization, and lower voltage than artificial water. 2) the concentration of COD in the substrate has an effect on the electrical properties of MFC. The activity of electroproducing microorganism increased, the anodic oxidation potential decreased, the cathodic reduction potential increased, the total potential increased, the redox ability increased, and the substrate utilization rate was high. When the concentration changed, the increase of anode potential was greater than that of cathode potential. Anode potential is the main factor affecting the generation of MFC. The electrical conductivity is closely related to the electrical properties of MFC. Compared with artificial water, the COD removal rate of domestic sewage MFC is high, the substrate utilization ratio is high, and the internal resistance of solution mass transfer is small. The removal efficiency of MFC in beer wastewater is low, the low substrate utilization ratio leads to the large internal resistance of charge transfer, the low conductivity leads to the internal resistance of solution and the mass transfer in the solution. The electrochemical reaction on the electrode surface is the main factor affecting the generation of electricity. (4) the discharge voltage range of PMS is 1.60-2.00 V and the output power range is 2.56-4.00 MW, which provides a solution to the problem of expanding the application range of MFC and lower voltage output.
【学位授予单位】：天津工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM911.45

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