填充床电极微生物燃料电池处理废水产电研究

发布时间：2018-04-30 14:04

本文选题：微生物燃料电池 + 填充床电极　；参考：《中国矿业大学》2017年硕士论文

【摘要】：该论文以钢丝球、颗粒活性炭以及钢丝球和颗粒活性炭混合材料作为微生物燃料电池(MFC)填充床阳极的电极材料,通过分析MFC的产电特性比选出最优的阳极填充材料;再采用此阳极材料搭建填充床MFC,研究阴阳极室理化条件对填充床MFC的产电性能影响;并探讨填充床MFC阳极产电微生物对苯酚、高盐度等逆环境的耐受能力和对有害物质的降解能力。试验启动过程中,MFC阴极材料为钢丝球和活性炭组成的复合填充阴极,阴极氧化剂为高锰酸钾,试验接种菌种为徐州市某白酒厂废水处理系统的厌氧池污泥,MFC采用序批式方式启动运行,运行周期为24小时。试验结果表明钢丝球填充阳极MFC经过24小时顺利启动,稳定运行后最大外电压为0.5V,最大功率密度为3197mW/m3。钢丝球阳极填充床MFC的启动速度、外电压、功率密度等重要指标在三种MFC阳极中均为最优。通过对MFC主要产电性能指标的对比分析发现钢丝球作为MFC阳极填充床电极最优,其主要原因是钢丝球具有较大的比较面积为阳极产电微生物提供附着生长的空间,并且钢丝球作为一个整体具有良好的导电性和稳定性。采用钢丝球阳极填充床MFC探讨阴阳极室条件对填充床MFC产电性能影响,重点关注阴极高锰酸钾浓度、PH值、水力循环以及阳极底物浓度和PH值对MFC产电性能的影响。试验结果表明增加阴极高锰酸钾浓度会增加阴极电势从而增强MFC的产电性能;高锰酸钾阴极最佳阴极PH为5;MFC的最大功率密度随水力循环流量的增加是先增加后减小,阴极增加水力循环会增强阴极的传质效率同时防止二氧化锰在阴极沉积,但过大的水力梯度会促使氧化剂进入MFC阳极破坏阳极厌氧环境从而降低MFC的产电性能;MFC阳极底物浓度存在产电限制浓度,当有机底物浓度低于限制浓度时产电性能与底物浓度正相关,当有机底物浓度高于限制浓度时产电性能不受有机底物浓度影响,本试验中的限制浓度为2700 mg/L;本试验中产电菌最适的PH值为7到8。采用钢丝球填充床阳极MFC探讨阳极产电微生物对苯酚和高盐度的耐受能力。试验结果表明MFC阳极产电微生物对苯酚有较强的耐受能力和降解能力,当阳极液苯酚浓度达到450mg/L时MFC的产电性能才受到了抑制,24小时候后更换阴极液,MFC的产电能力得以恢复。MFC的阳极微生物对盐度有良好的耐受能力,当氯化钠浓度达到50g/L时MFC的产电性能才能受到明显抑制,恢复阳极正常盐度后经过24后MFC的产电性能能够得以恢复。
[Abstract]:In this paper, steel wire ball, granular activated carbon and hybrid material of steel wire ball and granular activated carbon are used as electrode materials of microorganism fuel cell (MFCs) filled bed anode, and the optimal anode filling material is selected by analyzing the electrical characteristics of MFC. The effect of the physical and chemical conditions of anode and anode chamber on the electrical properties of packed bed MFC was studied, and the electroproducing microorganism of MFC anode in packed bed was investigated. Tolerance to adverse environments such as high salinity and ability to degrade harmful substances. During the start-up of the test, the cathode material of MFC is a composite filled cathode composed of steel wire ball and activated carbon, and the cathode oxidant is potassium permanganate. The anaerobic sludge cell (MFC), which was inoculated in a liquor plant wastewater treatment system in Xuzhou City, was started in sequence batch mode, and the operation period was 24 hours. The test results show that the wire ball filled anode MFC starts smoothly after 24 hours, the maximum external voltage is 0.5V and the maximum power density is 3197mW / m3after stable operation. The starting speed, external voltage and power density of the steel wire ball anode packed bed MFC are all optimal in the three kinds of MFC anodes. By comparing and analyzing the main electrical properties of MFC, it is found that the steel wire ball is the best electrode for MFC anode packed bed, and the main reason is that the steel wire ball has a large comparative area to provide the space for the adhesion and growth of the anode electrically producing microorganism. And the wire ball as a whole has good conductivity and stability. The effect of anode and anode chamber conditions on the electrical properties of MFC was investigated by using steel wire ball anode packed bed (MFC). The effect of concentration of cathode potassium permanganate (KMnO), hydraulic cycle, and the concentration of anode substrate and PH on the electrical properties of MFC was focused on. The experimental results show that increasing the concentration of potassium permanganate at the cathode increases the cathode potential and enhances the electrical properties of the MFC, and the maximum power density of the MFC increases first and then decreases with the increase of hydraulic circulation flow. An increase in hydraulic cycling increases the mass transfer efficiency of the cathode and prevents manganese dioxide from depositing at the cathode. However, if the hydraulic gradient is too large, the oxidant will enter the anaerobic environment of MFC anode to destroy the anode, which will reduce the electrical performance of MFC and the concentration of anode substrate of MFC will be limited by the concentration of electricity. When the concentration of organic substrate is lower than the limited concentration, the electrical performance is positively correlated with the concentration of substrate, and when the concentration of organic substrate is higher than the limited concentration, the electrical performance is not affected by the concentration of organic substrate. The limiting concentration in this experiment is 2700 mg / L, and the optimum PH value of electrogenic bacteria in this experiment is 7 to 8. The resistance of anodic electroproducing microorganisms to phenol and high salinity was investigated by using MFC of steel wire ball packed bed anode. The results showed that MFC anodic electroproducing microorganisms had strong tolerance and degradation ability to phenol. When the concentration of phenol in anodic solution reached 450mg/L, the electrical properties of MFC were inhibited. After 24 hours, the electricity production ability of replacing cathode solution was recovered. The anode microorganism of MFC had good tolerance to salinity. When the concentration of sodium chloride reached 50g/L, the electrical properties of MFC could be obviously inhibited, and the electrical properties of MFC could be restored after 24 years after the normal salinity of anode was restored.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X703;TM911.45

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