小球藻生物阴极型微生物燃料电池的基础特性

Research on Basic Characteristics of a Microbial Fuel Cell with Chlorella vulgaris Biocathode

利用自行设计的阴极管状光生物反应器式微生物燃料电池(MFC)作为实验模型,考察了阴极室投加小球藻后不同光暗周期下电池的产电、阴极溶氧及阴极藻的生长情况.结果表明,阴极投加小球藻后,电池产电性能明显提高,光暗间歇组最大功率密度为24.4mW/m2,持续光照组最大功率密度为27.5mW/m2.阴极溶氧及电化学分析证实溶氧是影响电压变化的主要因素,持续光照组溶氧较稳定,但比光暗间歇组光照阶段溶氧水平低;MFC阴极室培养小球藻不会对其造成毒害,光暗间歇时小球藻生长较好.运行小球藻生物阴极型MFC采用光暗间歇培养较好,并可适当延长光照时间.

Using the modified microbial fuel cell （MFC） with a tubular photo-bioreactor for a cathode compartment as the experimental model, the electricity generation of MFC, catholyte dissolved oxygen （DO）, and growth of Chlorella vulgaris in the cathode chamber were investigated under different light-dark cycles, when C. vulgaris was added in the chamber. The results showed the electricity generation of MFC with C. vulgaris biocathode was obviously enhanced, the maximum power density reached 27.5 mW/m2 in constant illumination group, and 24.4 mW/m2 in light-dark group. The analysis of DO and cyclic voltammetry curve proved that DO was the key factor affecting the electricity generation, and the DO value was more stable in constant illumination group, but lower than that in light-dark group in lighting phase. Moreover, no poison against the cultivation of C. vulgaris was found in the chamber. C. vulgaris grew well, especially in light-dark group. It is suggested that the MFC with C. vulgaris biocathode is better operated under light-dark cycle, and the period of cycle prolonged.