Design And Development Of Immobilized Microbiological Fuel Cell-electro Fenton Sewage Treatment System

In recent years,rural sewage treatment,as one of the important research directions in the field of environment,has received extensive attention.At present,the mainstream technology only focuses on the treatment of single domestic sewage,and it is difficult to form an effective synchronous treatment scheme for the township industrial wastewater,which accounts for a large proportion in the rural sewage.Based on this,the Immobilized Microbial Fuel Cell-Electro Fenton（IMFC-EF）wastewater treatment system was constructed in this thesis.The system can directly use the electric energy generated by electrogenerating microorganisms to degrade domestic sewage to treat industrial wastewater,so as to realize the synchronous treatment of domestic sewage and industrial wastewater.The main contents,methods and conclusions are as follows:1.Melamine-derived carbon sponges（MCS）loaded with nano zero-valent iron（n ZVI）was synthesized by means of high temperature calcination,liquid phase reduction and vacuum freeze drying.The material was tested and analyzed by a variety of physical and chemical characterization methods,and was used as the cathode catalyst of IMFC-EF system.The catalytic effect of Fenton reaction on the degradation of Rhodamine B（Rh B）and its influencing factors were also investigated.The results showed that n ZVI was successfully loaded on MCS.MCS@n ZVI-3 synthesized by 0.3mol/L Fe Cl₃·6H₂O precursor had the best catalytic effect.Under the conditions of p H3,H₂O₂ dosage of 5 m M,Fe SO₄ dosage of 0.02 g/L,and catalyst dosage of 0.1g/L,the degradation efficiency of Rh B was more than 95%within 10 min.The degradation was almost complete within 30 min.2.In order to further improve the power output and pollutant degradation efficiency of IMFC-EF system,the electrochemical performance of IMFC-EF system was analyzed by voltage,current,volumetric power density and other parameters.Through the optimization experiment of the operating parameters of IMFC-EF system,it was proved that the immobilized microorganism can improve the system electrical energy.When the initial p H of cathode solution was 3 and the external resistance was 100Ω,the system output energy was the highest.Then,Rh B degradation experiments were carried out for the system.Under the condition of no catalyst,the COD removal efficiency in the anode room reached 84%,and the Rh B degradation efficiency in the cathode room was 45.39%in 12 h.Under the condition of catalyst,the COD removal efficiency in the anode chamber reached 80.9%,the Rh B degradation efficiency in the cathode chamber reached 90%in 12 h,and the Coulomb Efficiency was 3.039%.The system can treat 1 L anode wastewater and 660 m L cathode wastewater per day.Finally,Rh B degradation experiments were carried out under different applied voltages.Regardless of the presence of catalyst,the optimal external voltage of the system was0.4V.