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电活性生物膜因为能直接向胞外产生电子,将生物能直接转化成电能,所以近年来已经成为国际领域内的研究热点.在电活性生物膜内部,一方面存在着复杂的生物电化学过程,另一方面微生物及生物膜生长又涉及复杂的质量传递过程.本文针对电活性生物膜不同生长阶段的质量传递损失和电荷传递损失展开研究,以期找到在不同时期内其产能的限制因素,这将对于电活性生物膜性能的改善具有至关重要的作用.本研究结果表明,80 h时,电荷传递阻抗占总内阻的99.8%.因此在电活性生物膜运行初期,电荷传递阻抗成为限制其产能的主要因素.随着运行时间的增长,电荷传递阻抗的比例不断下降,430和460 h时分别为86.9%和72.9%.运行到500 h后,电荷传递阻抗的比例下降到33.1%.然而此时,传质阻抗的占比上升到38.6%.因此当电荷性生物膜逐渐成熟时,电荷阻抗和传质阻抗共同成为其产能的限制因素.因此在电活性生物膜不同生长阶段,采用不同的方法来降低其对应的内阻对提高产电性能至关重要.
In recent years, electroactive biofilms have become the research hotspot in the field because they can directly generate electrons into the extracellular body and directly transform bioenergy into electrical energy.In the electroactive biofilm, on the one hand, there are complex bioelectrochemical processes , On the other hand, the growth of microorganism and biofilm involves complex mass transfer process.In this paper, we study the mass transfer loss and charge transfer loss in different growth stages of electroactive biofilm in order to find the limiting factor of its productivity in different periods, which Will play an important role in improving the performance of electroactive biofilm.The results of this study show that the charge transfer resistance accounts for 99.8% of the total internal resistance at 80 h.Therefore, during the initial operation of electroactive biofilm, the charge transfer resistance becomes a limit The main factors of its production capacity are as follows: The proportion of charge transfer impedance declines with the increase of operating time, which is 86.9% and 72.9% respectively at 430 and 460 h. After 500 h, the ratio of charge transfer impedance decreases to 33.1%. However, in this case, the mass transfer impedance increased to 38.6%, so that as the charge-forming biofilm gradually matures, the charge-transfer and mass-transfer impedances together become its productivity Therefore, in the different growth stages of electroactive biofilms, it is very important to adopt different methods to reduce the corresponding internal resistance to improve the electricity production performance.