共基质下微生物燃料电池同步脱色甲基橙与产电性能

采用双室方形微生物燃料电池(MFC),以葡萄糖作为共基质,研究了共基质浓度对典型偶氮染料甲基橙在MFC阳极室中脱色效率及同步产电的影响。结果表明,在0~1.5 g/L浓度范围内,共基质浓度越大,甲基橙脱色率、COD去除率和最大输出电压越高。在共基质浓度为1.5 g/L,进水甲基橙为300 mg/L的条件下,8 h的脱色率高达95%,且在1 000 Ω外电阻下,最大输出电压达到662 mV;在无共基质条件下,8 h内对300 mg/L甲基橙的脱色率仅为7.5%,最大输出电压仅达到140 mV。厌氧对照实验表明,甲基橙在MFC中可以实现加速脱色,反应8 h后甲基橙在MFC中的脱色率提高了57%。该研究为开发新型MFC降解偶氮染料废水技术提供了理论依据。

Simultaneous methyl orange decolorization and electricity generation in microbial fuel cell with co-substrate

Two-chambered cubic microbial fuel cells with glucose as co-substrate and methyl orange as characteristic pollutant were constructed to investigate the effects of co-substrate concentration on methyl orange decolorization efficiency and electricity generation. The results showed that the decolorization efficiency, COD removal rate and the maximum voltage output increased with an increase of co-substrate concentration in the studied concentration range of 0~1.5 g/L. The decolorization efficiency of 300 mg/L methyl orange reached 95% in 8 hours and the maximum voltage outputs was 662 mV under 1 000 Ω external resistance. If there was no co-substrate existed in the anode chamber, the decolorization efficiency of 300 mg/L methyl orange only reached 7.5% and the maximum voltage output was only 140 mV during 8 hours. Moreover, compared to the open-circuit comparison experiments, accelerated decolorization efficiency of MO was realized in MFC, the decolorization efficiency increased by 57% during 8 hours. This study provided the theoretical basis for a new way to treat azo dye by MFC.