Optimization Of Operating Conditions For Treatment Of Phenol-Containing Wastewater By MFC-MBR Coupling System

In the production process of the coal coke industry,the petroleum industry,the production or use of phenol and other phenolic compounds,a large amount of phenol-containing wastewater is produced.The phenolic compound is a prototype poison,which not only poses a health threat to the human body.It will also affect the normal production of aquaculture,animal husbandry and agriculture.At present,there are many treatment methods for phenol-containing wastewater,including physical methods,chemical methods,and biological methods.The most common application is the biological method.Microbial Fuel Cell and Membrane Bioreactor are two of the biological methods.Since MFC and MBR have structural similarities,there is a possibility of coupling the two in one reactor,namely the MFC-MBR coupling system.At present,the main research directions of MFC-MBR coupling system are three aspects:(1)MFC and MBR coupling system control membrane fouling mechanism research.(2)Research on reactor configuration of MFC and MBR coupling system.(3)Research on membrane materials of MFC and MBR coupling systems.However,research on the use of phenol-free wastewater to treat refractory degradation is rare.Therefore,this study constructed an MFC-MBR coupling system to treat phenol-containing wastewater,using simulated wastewater as an experimental water source,and domesticated MFC-MBR coupling by means of gradient acclimation.The system explores its optimal operating conditions by controlling variables and structurally improves it.Found the following conclusions:The MFC-MBR coupling system was constructed,and the anaerobic pool sludge of the sewage treatment plant was used as the inoculating source.The external resistance was1000?,the aeration intensity was 2L/min,and the magnetic stirrer stirring intensity was30r/min.In the end,the highest voltage output of 0.74V can be achieved.When verifying the feasibility of the coupling system MFC-MBR to treat phenol,it was found that the addition of phenol at the MFC cathode would change its electricity production.After adding 500COD phenol to the cathode,the maximum voltage can reach 0.74V,and the maximum power density can be Up to 101.4 mW/m~2,the internal resistance is 163?,and the maximum voltage can reach 0.71V,the maximum power density can reach 65.885 mW/m~2,and the internal resistance is 277?when compared with the MFC cathode without reaction substrate.Through analysis,we believe that the oxidizing ability of the hydroxyl group(-OH)in phenol is stronger than that of oxygen.Taking HRT,external resistance and influent COD as operating conditions,considering the power generation and pollutant degradation ability,we found that the optimal operating condition of MFC-MBR coupling system is HTR3h,external resistance 150?,influent COD value 500mg/L,aeration intensity 2L/min,magnetic stirrer strength 30r/min.Under this condition,a power density of 96.8 mW/m ~2 and a COD degradation rate of 80.3%were obtained.The MFC-MBR coupling system is structurally improved.The electric energy generated by the MFC-MBR coupling system is used as the power source.The external electric field is constructed by carbon felt around the MBR membrane module,and the effect of the electric field force on the membrane contaminants is alleviated.This study provides reliable theoretical analysis and experimental support for the treatment of phenol-containing refractory wastewater by MFC-MBR coupling system,which is helpful to realize the application value of this technology in the treatment of phenol-containing wastewater.