| Population, environment, resources and development constitute the world’s mostprominent four problems, especially among our most difficult environmental andresource issues. Especially as a dry country, how to use a minimum of energy andinvestment to achieve the maximization of wastewater treatment efficiency hasbecome an important direction of the majority of scholars think that the researchprocess is often subject to constraints of another problem: that is accompanied bysewage (waste) water governance standards at the same time generate a lot of sludgeproblems. Microbial fuel cells have to waste because of the reaction substrates and theability to achieve the removal of pollutants generated currents into account, opened upnew ideas sewage treatment process, not only does not require energy input, butprovides a very practical value of electricity, even report has found the source of thesludge reduction effect. Therefore, we designed a class A2/O biological cathodemicrobial fuel cell for wastewater treatment effect study MFC process, producingelectrical properties and sludge reduction effect, and further to find correlation andconditionality between the three.In this paper, self-designed and constructed class A2/O type MFC system assewage treatment target, after26days to complete the boot, stable output voltage of0.515V, where the anode potential is-0.48V, the cathode potential is0.035V. Duringstable operation, its basic electrochemical performance indicators: internal resistanceequal to421Ω, the maximum power density is0.3067W/m3, the hydraulic retentiontime of24h of conditions, Coulomb efficiency gain of1.99%. MFC systems sewagetreatment effects are slightly better than the A2/O system. Among them, the removalefficiency of COD and ammonia nitrogen at about90%, about40%of total nitrogenremoval and phosphorus removal rate was68%. HRT have a greater impact for theremoval of ammonia, when the HRT increased from8h to24h, ammonia nitrogenremoval rate increased from20%to90%. Aeration aeration mode is reasonably45minutes,45minutes interval, can not only obtain a good effect of sewage treatment, itsaves operating costs of energy consumption of the system.Compared to three systems, MFC system sludge production minimum, A2/Osystem, followed by the maximum static test system. Which, MFC system than theA2/O system reduced sludge production14.53%,62.1%decrease than the staticexperimental system. MFC system sludge Yobs and A2/O systems and static control system compared to an average reduction of11%and38%. Under the sameconditions the operating conditions, the MFC cathode activated sludge system hasbetter sludge activity. The presence of the MFC and A2/O and two systems of sludgesupernatant significant differences in the protein content of EPS, EPS higher proteincontent in the supernatant of polysaccharide and protein distribution of the twosystems are similar, but the content is much lower than the protein. Compared withA2/O system, the amount of polysaccharide concentration in aerobic sludge MFCsystem is slightly lower. MFC systems and A2/O system at different sampling pointsmeasured elemental mass percentages are quite different, but with a certain regularity.Each reaction zone are the most abundant elements carbon, oxygen, followed bynitrogen and hydrogen content of less and less, sulfur content in the least.Significantly different sludge aerobic zone, anoxic zone anaerobic sludge and sludgecomponents in addition to the two systems of elemental S, the remaining C, N, H, Oare four elements in the aerobic zone sewage the highest percentage of the mass ofmud, slightly higher than the anaerobic zone anoxic zone. |
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