基于pH值调控的沉积型微生物燃料电池(SMFC)运行特性

pH REGULATION OF SEDIMENT MICROBIAL FULL CELL PERFORMANCE

以蓝藻发酵液为处理对象,分别研究两极区pH值对沉积型微生物燃料电池(Sediment Microbial FuelCell,SMFC)运行特性的影响.结果表明,阳极碱性(pH=8.5)阴极酸性(pH=5.5)时,SMFC输出功率最高(83.55 mW·m-2),COD去除率(63%)仅次于阴、阳极中性(阴、阳极pH值均为7)时(48.74 mW·m-2,68%).通过稳态放电法确定阳极碱性阴极酸性条件下最大输出功率达98.94 mW·m-2,极化曲线拟合其内阻为360Ω.此外,从电池电势方面进一步考察SMFC产电特性.研究结果表明可以通过调节阴阳极pH优化SMFC产电性能.

The microbial activity in sediment microbial fuel cell（SMFC） is heavily influenced by anodic pH value,and the reductive reaction of electrons,protons and oxygen is affected by cathodic pH value.Moreover,the two pH values influence each other through the proton transfer.Using cyanobacterium acidogenic fermentation as main fuel of SMFC system,the influence of anodic pH and cathodic pH value on the SMFC performance was investigated in this paper,and a novel method for treating cyabacteria is provided.The results show that the SMFC produced the highest power density（83.55 mW·m-2） at pH 8.5 in anode and 5.5 in cathode,with COD removal efficiency of 63%,which is second only to that of the SMFC at pH 7 in both chambers（48.74 mW·m-2,68%）.The highest power density（98.94 mW·m-2） and an internal resistance（360 Ω） was obtained using the steady discharging method.In addition,the performance of SMFC was investigated in terms of cell potential,further suggesting that the performance of SMFC could be optimized by adjusting the pH of anodic or cathodic chamber.