微生物燃料电池阳极区域传质模拟

摘要

In microbial fuel cell anode region of biochemical reactions and with diffusion mass transfer mathematical model,taking into account the proliferation of cases,the biofilm substrate degradation and cell performance was simulated. Analyse the biofilm thickness variation over time,biomass and substrate concentration relationship between the MFC obtained polarization curves and power density curve. The results show that: increase of biomass, biofilm growth is not uniform in a certain period of time; substrate concentration affect the growth of microorganisms;meanwhile microbial fuel cell polarization curves for the activation polarization and concentration polarization zone section segment is also affected.%目的 研究微生物燃料电池阳极区域内部传质过程.方法 在微生物燃料电池阳极区域传质过程分析的基础上,提出阳极区域传质的几何模型,建立底物扩散传质、质量守恒、生物反应动力学和电极反应动力学模型.通过对阳极区域传质过程的模拟,研究了底物一次性投加和多次投加过程中底物质量浓度、生物量和电极表面生物膜层的变化规律,同时考察了生物量和底物质量浓度对微生物燃料电池产电的影响.结果 在底物总投加量一定的情况下,多次投加培养的生物量比一次性投加培养的生物量多,底物分解速率多次投加快于一次投加；增加生物量有利于降低活化极化和浓差极化；高底物质量浓度增加了浓差极化,低底物质量浓度增加了活化极化.结论 利用微生物燃料电池数学模型可以对电池内部物质传递及生化反应过程进行数值模拟.