啤酒—电镀废水双处理微生物燃料电池的构建及群落结构分析

发布时间：2018-03-23 02:23

  本文选题：微生物燃料电池　切入点：啤酒废水　出处：《山西师范大学》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)是一种以产电微生物作为催化剂,直接将化学能转化为电能的装置,是微生物与电池技术相结合与发展的产物。MFC可以处理多种废水,包括染料废水、啤酒废水、糖蜜废水、生活污水、电镀废水等。其中,啤酒废水和糖蜜废水具有浓度高且有机物含量高的特点,可以用于MFC阳极底物,为阳极产电微生物提供营养;电镀废水因其含有重金属离子,使其具有强氧化性和高氧化还原电位的特点,可以用于MFC阴极液作为电子受体。此外,MFC还具有淡化海水和产能发电等多重功能,对未来的现实应用研究具有深远的意义。本研究首先构建了分别以啤酒废水、糖蜜废水和啤酒-糖蜜混合废水作为阳极底物,电镀废水作为阴极电极液的MFC;其次,平行构建阳极电极有效面积为25 cm2、50 cm2和75 cm2的MFC;随后,平行构建阳极电极液温度分别为20±2℃和35±2℃的MFC,考察各个装置的产电性能和污水处理效果;最后采用454高通量测序技术对MFC阳极微生物群落进行了分析。实验结果显示:(1)以糖蜜废水作为阳极电极液的MFC产电量和COD去除率最高,啤酒废水次之,啤酒-糖蜜混合废水最低。其最高电压和功率密度可达356.3 mV和36.21 mW/m2,第3周期时COD去除率达到最高的69.29%,实验结束时阴极银离子浓度最低至304 mg/L;(2)以阳极电极有效面积为75cm2的MFC产电量和COD去除率最高,50 cm2次之,25cm2最低。其最高电压和功率密度可达375.1 mV和18.76mW/m2,第3周期时COD去除率达到最高的68.88%,实验结束时阴极银离子浓度最低至309 mg/L;(3)以阳极室电极液温度为35±2℃的MFC产电量和COD去除率最高,20±2℃最低。其最高电压和功率密度可达312.4 mV和19.52 mW/m2,第3周期时COD去除率达到最高的68.17%,实验结束时阴极银离子浓度最低至305 mg/L;(4)在以啤酒废水作为阳极diajiye的MFC中,其产电优势菌有8种,其中Ethanoligenens_uncultured_bacterium为主要优势菌种。Pectinatus_unclassified、Bacteroidales_unclassified、Raoultella_unclassified、Enterobacter_unclassified和Veillonellaceae_unclassified为未知菌种。研究表明,构建啤酒-电镀废水双处理MFC具有可行性,阳极电极液、阳极电极有效面积和温度都对双极室MFC的产电性能和污水处理效率有影响,以啤酒废水作为阳极电极液的MFC中Ethanoligenens_uncultured_bacterium为主要优势菌种。
[Abstract]:Microbial Fuel cell (MFC) is a device that directly converts chemical energy into electric energy using electroproducing microorganism as catalyst. It is a product of the combination and development of microorganism and battery technology. MFC can treat many kinds of wastewater, including dye wastewater. Beer wastewater, molasses wastewater, domestic sewage, electroplating wastewater, etc. Among them, beer wastewater and molasses wastewater have the characteristics of high concentration and high organic content, which can be used as anode substrate of MFC and provide nutrition for anode electroproducing microorganism. Electroplating wastewater can be used as electron acceptor because of its strong oxidation and high redox potential because of its heavy metal ions. In addition, it also has many functions such as desalination of seawater and power generation. It is of great significance for future practical application research. Firstly, MFCs with beer wastewater, molasses wastewater and beer-molasses mixed wastewater as anode substrate and electroplating wastewater as cathode electrode solution were constructed. The effective area of anode electrode was 25 cm ~ (2) ~ (2) cm2 and 75 cm2 respectively, and then, the anode electrode solution temperature was 20 卤2 鈩，

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