| With the development of the global economic, the pollution of the water and sludge will become serious. In the present study of various sewage treatment process, there are a huge amount of sludge. And it caused a serious problem of environment. And the microbial fuel cell is a new technology of waste organic. Rely on the anaerobic degradation of organic substances in the fuel cell, we can get power from the organic pollutants in the form of electricity.So there is two sets of the same design of reactor, one is membrane-less microbial fuel cell reactor, the other is a A/O reactor. Under the same conditions, there is a study of the urban sewage treatment effect, synchronization sludge reduction and the performance of the electricity production, when they are dealing with the same sewage. The integration of environmental analytical tools, we analysised the effect of the reactor to remove sewage. While in the electrochemical principles, we also analysis the polarization characteristics of the MFC, the internal resistance value, the power density and coulombic efficiency. There is extracellular biological organic matter in the sludge. Then it extracted by XAD-8/XAD-4resin. And get several component. Then we do infrared spectroscopy, fluorescence spectroscopy and other features analysis of the sequential extraction components.Studies have shown that the membrane-less MFC is to use the sewage as the inoculums and the culture medium. And after35d, we successfully launched the MFC, and it get into the steady state. The MFC reactor’s sewage treatment effect was better, with the COD removal rate of90%, the ammonia removal rate of80%. The oxygen catalytic reaction in the cathode is the key step of the MFC battery performance. And the cathode and anode potentials were very stable, about0.1V of the cathode potential,-0.23V of the anode potential. Then it showed a stable power output at0.43V. And also found that the internal resistance of the MFC was358Ω, the maximum output power was0.0776W/m3, the coulomb efficiency is1.12%.Compared with the A/O system, the MFC system have a better treatment effect, the effluent COD value of32.39mg/L, the removal rate is more than89%. The ammonia is about2mg/L, the removal rate is92%. But with the reduction of HRT, the effect of the A/O and MFC reactor produce major changes. Ammonia nitrogen removal effect rapidly down, while the COD change a little. With the HRT change from24h to8h, the removal efficiency decreased from90%to30%. The nitrate concentration in the water quickly reduces from30mg/L to5mg/L. And the internal resistance first increase and then decrease, while the power density and coulombic efficiency continued to reduce. Using intermittent aeration and controlling the aeration mode, which can effectively increase the reactor to remove organic matter and ammonia nitrogen in the sewage, while producing little effect change of electrical properties of membrane-less MFC system. In the four aeration modes, open circuit voltage is0.428V,0.445V,0.430V and0.399V, the internal resistance is430Ω,410Ω,378Ω,510Ω, maximum output power density is0.134W/m3,0.141W/m30.150W/m3, and0.093W/m3, the coulomb efficiency is1.79%,1.84%,1.90%,1.2%, respectively.The sludge generated by the MFC reactor, is850mg/L in the amount of sludge, and the sludge settling index is123mL/g. Compared with the A/O system, it show good in the two areas. And in the EBOM of sludge of the MFC system, there are many fluorescent. In addition to soluble microbial products and aromatic protein, there is still humic acid substances fluorophores in the HPO-N and TPI-A which was conducive to MFC microbial to transfer electron. |
PDF Full Text Request