不同类型油田采出水作为阳极底物对MFC电压的影响

The Influence on Voltage of MFCs by Three Oilfield Wastewaters

考察水驱采出水、聚驱采出水和三元复合驱采出水3种主要油田废水分别作为阳极底物时对3组微生物燃料电池(MFC)输出电压的影响及影响因素,考察采出水中主要难降解有机物的去除效果。结果表明,使用成分更为复杂、COD值高的聚驱采出水和三元复合驱采出水作为阳极底物的MFC产生的电压较大,可达到647和570 mV,水驱采出水最小,为270 mV;一个运行周期内,随着反应进行3个微生物燃料电池的阴极电势相对稳定,阳极电势有明显升高趋势,输出电压的变化主要来自阳极的贡献。阳极底物的COD去除效果和库伦效率均对阳极电势产生影响。其中,微生物燃料电池对废水中表面活性剂的去除效果最好,在进水浓度为67.8 mg/L时,出水浓度为2.1 mg/L,去除率达到96.90%;不同采出水的石油和聚合物的去除效果符合MFC的输出电压和阳极底物COD值变化规律。

The vohage is the critical electrochemical parameter in microbial fuel cells （MFCs）. There are three major oilfield wastewaters in- cluding water flooding produced water, polymer flooding produced water and ASP flooding produced water. These three wastewaters were used as anode substrate of three MFCs. The influence and the influencing factors of the output voltage of the three MFCs and the produced water main refractory organics removal effect were studied. The results showed that the voltage of MFCs with polymer flooding and asp flooding pro- duced water, which contained more complex components and had relatively high COD values, as anode substrate can achieve 647 mV and 570 mV, bigger than the voltage of MFC with water flooding produced water as substrate, which minimum for 270 mV. During this reaction period, MFCs cathode potential stays relative stable, however, anode potential shows a remarkable increasing trend, thus, the anode contributes most- ly to the change in output voltage. COD removal effect of anode substrate and the coulombic efficiency are both influencing factor s of the an- ode potential. The microbial fuel cell for wastewater of surfaetant, remove the best effect, with the influent concentration of 67.8 mg/L, the effluent of 2.1 mg/L, removal rate of 96.90%. For different produced water, oil and polymer removal effect abide by the MFC output voltage and COD value changing law.