The Key Technology Research Of Microbial Fuel Cell Applied To Wastewater Treatmen

In this paper, it introduced the mechanism of microbial fuel cell （MFC） and thelatest research process.On this basis, the single chamber microbial fuel cell （MFC）without proton exchange membrane was established by using common carbon clothas the anode and glucose as the sole substrate. We tested the concentration of CODand NO₃^-in the beginning and ending. At the same time an air-cathode tube-formsingle chamber microbial fuel cell （MFC） without proton exchange membrane wasestablished by using common carbon cloth as the anode and glucose as the solesubstrate, and its performance was studied. Culture medium solutions containingglucose, glucose and nitrate, glucose and sulfate or glucose and iron chloride wereindividually added into the anodic chamber in corresponding treatments. Voltageoutput of the MFC and the initial and terminal concentrations of each substratewere monitored. And constructed a two-chambered microbial fuel cell （MFC） and asimilar abiotic fuel cell--steel fuel cell （SFC）,studies the influence of eliminationeffect about various variables （anode material, size of salt bridge and so on） to thenitrate. The results show that:The removal efficiencies of MFC for COD and nitrate were63.8%and74.5%respectively, the average degradation rate of COD and nitrate is about13.59mgCOD/L då'Œ5.83mgNO₃^-/L d.It indicated that MFC is a highly effectiveway to remove nitrate.Higher oxidation and reduction potential of the electron acceptor in MFCwillgreatly influence electron acceptance and transmission by the anode. Data fromthis study suggest that the affinity to electrons for the common carbon cloth anodein an MFC is probably between that ofnitrate and sulfate, close to ferric iron.The different choice of cathode and anode material, the different size of saltbridge can have a very tremendous influence to the nitrate elimination.Theresearch indicated that the density reduction of nitrate increases along with thediameter of salt bridge increases, increases along with the length of salt bridgereduces. The degeneration efficiency of MFC and SFC to nitrate are equally71.46%and67.99%, the average degeneration speed of nitrate is8mgNO₃^-/L dapproximately.A positive correlation between the nitrate removal rate in cathode chamber and the output voltage of the MFC.The results show that: MFC can be enhanced the treatment of highconcentration organic wastewater, which was higher than that by traditionalanaerobic treatment technology, and it could generate power. And MFC will also bedesigned to enhanced denitrification, and promoting the nitrate degradation. MFChas great potential in the development of wastewater treatment as a newtechnology.