Experiment Study On The Electricity Generation Performance And Effect Of Nitrogen Removal Of Double Chamber Microbial Fuel Cell

Microbial fuel cell is a newly-developing wastewater resource utilization technology, which can both purify waste water and recycle energy substances in the waste water. The basic principle of MFC is that microorganism can be used as a catalyst, and the chemical energy can be translated into electrical using organic matter in wastewater as fuel. Currently, there are dual pressures of environment pollution and lack of energy; applying MFC has the advantages of both electricity production and waste water purification, which has been opening up a new and wide road for effluent treatment.This paper constructed a dual chamber microbial fuel cell, investigated the electrical properties under four different conditions MFC cathode(cathode aeration 1, potassium ferricyanide cathode, the cathode 2 and hypoxia aeration capacity cathode), and mainly focused on the improvements of using potassium ferricyanide as electron acceptor on cathode properties. Consequently, it drew the following conclusions: when nitrite was used as an electron acceptor, the open circuit voltage of biocathode hypoxia was lowest, only 433.5 m V; When potassium ferricyanide with lower overpotential was used as an electron acceptor, the maximum open circuit voltage of MFC is 744.2 m V; and potassium ferricyanide not only can make MFC get higher electricity production performance, but be able to producing persistent improvement on cathode.Migration and transformation of ammonia in aerobic cathode MFC have been studied and the results showed that the rate of NH4 + migrate across the proton exchange membrane to the cathode is related to current density.When current density is smaller, there has linear positive correlation between NH4+ migration rate and current density; when the current density reaches a higher value, N H4+ migration rate will reach its maximum value, and then the increase of current density will not cause further increase on rate of migration of NH4+. In addition, the aerobic cathode MFC can be used to recycle the ammonia from synthetic leachate.Autotrophic anti- nitrification MFC was built, and this experiment emphasized on the influence of DO, electron transfer and influent nitrite load of the cathode of MFC on denitrification performance and capacity electrical properties. Meanwhile, the experiment studied the process of producing N2 O during the autotrophic denitrification in anti- nitrosation MFC, based on which it proposed the approaches of N2 O reduction. The results showed that: at low concentration of DO, output power of MFC is lower, whereas the effect of the anti-nitrosation is relatively better, furthermore, the output of N2 O during anti-nitrification process is lower in low-oxygen environment; the high nitrite concentration will inhibit anti-nitrosation reaction to result in the accumulation of N2 O.