【作者】 孙伟；

【导师】 宫磊；

【作者基本信息】 青岛科技大学 ， 环境工程， 2013， 硕士

【摘要】 构建了“H”型双室微生物燃料电池(microbial fuel cell,MFC),以厌氧活性污泥接种,研究了醋酸钠与直接大红共基质对MFC产电性能以及阳极室内直接大红脱色和COD去除的影响,同时研究了过硫酸铵和铁氰化钾分别作为阴极电子受体时对MFC产电性能及阳极COD去除率的影响。经过三个周期连续更换醋酸钠底物后,MFC成功启动。进一步考察了醋酸钠初始浓度、直接大红初始浓度以及不同外阻对MFC产电性能以及阳极室内脱色、COD去除的影响。结果表明,MFC能够以醋酸钠和直接大红为共基质实现同步产电与脱色。电池输出电压由醋酸钠浓度0.5g/L时的213.2mV增大到2.0g/L时的404.1mV；输出功率由0.5g/L时的65.53mW/m3增大到2.0g/L时的80.62mW/m3。增加醋酸钠浓度会提高MFC输出电压和输出功率,但无限增大醋酸钠浓度并不能无限制地提高电池电压和输出功率。随醋酸钠浓度增大,直接大红脱色率均大于70%,但相差不大。醋酸钠实验浓度范围内,COD去除率均大于80%,同样醋酸钠初始浓度对COD去除率影响不大直接大红对MFC中的产电微生物的活性有抑制作用,但直接大红在较低浓度范围内变化对MFC最终电压输出以及直接大红脱色和COD去除影响不大。在直接大红浓度为100-250mg/L的范围内,MFC最终输出电压均能达到430mV左右,输出功率在60mW/m3以上。MFC对直接大红最终脱色率均在70%以上,COD去除率在70%～80%左右。直接大红浓度越大,达到脱色平衡和COD去除平衡的时间会相对延长。重新启动MFC,考察了不同过硫酸铵和铁氰化钾浓度以及不同阴阳极体积比对MFC产电性能和阳极室内COD去除的影响。结果表明：阴阳极溶液体积相等、外阻为1000ΩΩ时：对于过硫酸铵(10.Og/L),电池的最大输出电压为654mV,最大开路电压为1029.0mV,电池内阻最小为982.5Ω,最大体积功率密度为385mW/m3；对于铁氰化钾(10.0g/L),电池的最大输出电压为413mV,最大开路电压为711.8mV,电氾内阻最小为2339.4Ω,最大体积功率密度为78mW/m3随着电子受体浓度的增加,阳极最大COD去除率先增大后减小.阴阳极溶液体积比一定程度上会影响电池输出功率,阴极与阳极体积比小于等于1时,电池输出功率大于阴极与阳极体积比大于1的。更多还原

【Abstract】 A H-type two-chambered microbial fuel cell (MFC), using anaerobic activated sludge as inoculums, was constructed to investigate the effect of sodium acetate and Congo red as co-substrates on electricity generation of MFC and decolorization and COD removal of MFC anode chamber, and the effect of ammonium persulfate and potassium ferricyanide as cathodic electron acceptor respectively on the performance of MFC.After several cycle gradual addition of acetate, MFC was successfully started up. Then the effect of initial acetate and Congo red and different external resistance on electricity generation of MFC and decolorization and COD removal of MFC anode chamber were studied. The results show that acetate and Congo red can be used by microorganisms to generate electricity and decolorization. The voltage output of MFC increases from213.2mV to404.1mV and the power output increases from65.53mW/m3to80.62mW/m3when concentration of sodium acetate changes from0.5g/L to2.0g/L. The voltage output and power output can be increased with higher acetate concentration, but is not increased infinitely. With concentration of acetate increasing, Congo red decolorization are all greater than70%, COD removal rate are all higher than80%, but the difference is not significant.Activity of current producing microorganisms is kept down by the addition of Congo red, but the final voltage output as well as Congo red decolorization and COD removal are not affected obviously. The voltage output of MFC are all above430mV and the power output are all about70%～80%. The higher the concentration of Congo red, the balance time of decolorization and COD removal will be prolonged relatively.MFC was restarted up. Then the effect of different concentration of ammonium persulfate and potassium ferricyanide on electricity generation of MFC and COD removal of MFC anode chamber were investigated. The results show that when the volume of the cathode and athode is equal and the external resistance is1000Ω, ammonium persulfate (10.0g/L) as the electron acceptor has the maximum open circuit voltage of1029.0mV, the minimum internal resistance of982.5Ω and the maximum power output of385mW/m3.Potassium ferricyanide (10.0g/L) as electron acceptor has the maximum open eircuit voltage of711.8mV, the minimum internal resistance of2339.4Q and the maximum power output of78mW/m3.The power output is influenced by the volume ratio of the anode and cathode to a certain extent. With the concentration of electron acceptor, anode maximum COD removal first increases, then decreases When the volume ratio of cathode and anode is less than1or equal to1, the power output is higher than that more than1.更多还原