微生物燃料电池对阳极溶液中可溶性有机物的氧化降解是通过附着在电极上的生物膜进行的.本文建立了微生物燃料电池阳极生物膜一维数学模型,采用有限容积法对控制方程进行离散,对组分方程和电势方程进行耦合求解,研究了生物膜的孔隙率、液相主体浓度和电导率对产电性能的影响.计算结果表明孔隙的存在对生物膜的产能具有积极作用;底物主体浓度较低时,底物浓度是限制电子产生的主要因素,随着底物主体浓度的升高,电导率是限制微生物电子生成的主要因素,提高电导率可以改善生物膜上的电子产生速率.高电导率不仅降低了生物膜内电子传递的阻力,而且也间接地提高了靠近液相主体的生物膜区域的电子生成速率.
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