樊立萍1,*,温越霄1,2

Preparation of anodes by SA-PQ-11/CF to improve MFC wastewater treatment efficiency and power generation performance

摘要:

为提高微生物燃料电池(MFC)的废水处理效果和发电性能,制备了一种海藻酸钠-聚季铵盐11/碳毡(SA-PQ-11/CF)阳极,分别以制药废水和糖蜜废水为阳极液,以碳毡为阴极,构建微生物燃料电池(MFC)实验系统,通过扫描电子显微镜(SEM)、电化学阻抗谱(EIS)、循环伏安特性(CV)、化学需氧量(COD)对其性能进行表征。结果显示,SA-PQ-11/CF阳极具有较大的比表面积,MFC的溶液电阻和电荷转移电阻也得到明显降低。阳极液为制药废水时,采用SA-PQ-11/CF阳极的MFC的稳态输出电压和COD去除率分别约为0.22 V和62%,较常规碳毡阳极时分别提高了100%和130%。阳极液为糖蜜废水时,采用SA-PQ-11/CF阳极的MFC的稳态输出电压和COD去除率分别为0.15 V和43%,分别较采用常规碳毡阳极时提高了275%和95%。基于SA-PQ-11的阳极改性能够有效提高MFC的废水处理效果和产电能力。

Abstract:

In order to improve the wastewater treatment effect and power generation performance of microbial fuel cell (MFC), a kind of carbon felt (CF) anode modified by sodium alginate and polyquaternium 11 (SA-PQ-11/CF) was prepared. A microbial fuel cell (MFC) experimental system was constructed using pharmaceutical wastewater and molasses wastewater as anode solutions and carbon felt as cathode, respectively, and its performance was characterized by scanning electron microscope (SEM), electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV) and chemical oxygen demand (COD). The results showed that the SA-PQ-11/CF anode had a larger specific surface area, and the solution resistance and charge transfer resistance of MFC were also significantly reduced. When the anolyte was pharmaceutical wastewater, the steady-state output voltage and the COD removal rate of MFC using SA-PQ-11/CF anode were about 0.22 V and 62%, respectively, which were 100% and 130% higher than those using CF. When the anolyte was molasses wastewater, the steady-state voltage and COD of MFC using SA-PQ-11/CF anode were 0.15 V and 43%, respectively, which were 275% and 95% higher than those using CF anode. The anode modification based on SA-PQ-11 can effectively improve the wastewater treatment efficiency and power generation capacity of MFC.