阳极添加三价铁离子对沉积型微生物燃料电池运行特性的影响

Effect of Fe(Ⅲ) added into anode region on performance of sediment microbial fuel cell

以剩余污泥为底物和接种物,借助电化学交流阻抗等电化学分析方法,研究了阳极投加三价铁离子对沉积型微生物燃料电池(sediment microbial fuel cell,SMFC)电能输出及内阻分布的影响。结果表明,500 mg/L铁离子可有效改善SMFC的运行特性,功率密度峰值、底物降解速率和阳极污泥絮体大小分别上升到103.09 m W/m^2、35.68 mg VSS/(m^3/h)和190.33μm。电化学阻抗谱分析表明,阴极欧姆内阻及极化内阻随铁离子浓度增加而降低,阳极内阻则随铁离子浓度增加先降低后增加,当三价铁离子添加浓度为500 mg/L时,阳极欧姆内阻和活化内阻与对照组相比分别下降了45.28%和47.97%。

With the aid of electrochemical impedance spectroscopy analysis,the effect of Fe（ Ⅲ） added into the anode region on the power output and impedance distribution of sediment microbial fuel cell（ SMFC）treating waste activated sludge was explored. The results showed that 500 mg/L Fe（ Ⅲ） enhanced the performance of SMFC. The maximum power density,substrate degradation rate and the sludge floc sizes rose to 103. 09 mW/m^2,35. 68 mg VSS/（ m^3·h） and 190. 33 μm,respectively. Electrochemical impedance spectroscopy analysis showed that the ohmic resistance and the polarization resistance of cathode decreased with increasing the concentration of Fe（ Ⅲ）. And the resistance of the anode firstly declined,and then climbed as increasing the concentration of Fe（ Ⅲ）. With 500 mg/L of Fe（ Ⅲ）,the ohmic and activate resistances of the anode dropped45. 28% and 47. 97% compared with the control respectively.