Research On Degradation Of Antibics Simulated Wastewaer By Microbial Fuel Cell

Global water pollution is more and more serious in recent years, which gradually turned into a bigproblem of restricting the sustainable economic development. Therefore, we need to find a wastewatertreatment technology of low cost, less energy consumption and good economic benefits to alleviate thecurrent crisis. As a new wastewater treatment technology and energy development process, microbial Fuelcells (MFC) was widely researched.Antibiotics are an important group of pharmaceuticals in human and veterinary medicine. Largeamounts of antibiotics are produced, consumed and widely used in prevention and treatment of diseases.Because of the abuse of antibiotics, the large number of unabsorbed antibiotics emerged into theenvironment through a variety of ways have generated diverse toxic effects to organisms. Hence, it isnecessary to explore an effective method to remove the residual antibiotic. In this study, A two-chamberedMFC with carbon paper as electrode was made, which using glucose as substrate and K3Fe(CN)6aselectron accsptor to treat antibiotics-contain wastewater （metronidazole, chloramphenicol andsulfanilamide）, aiming to study the degradation efficiency of antibiotics, the effects of kinds andconcentration of antibiotics on output voltage, output power and electrode polization performance. Themain contents and conclusions are as follows:1. The MFC was used to treat the metronidazole-contained wastewater. When compared MFC withanaerobic reactor to dealed with the same initial concentration of metronidazole, we have found MFCtreatment effect was significantly superior to conventional anaerobic reactor. The removal efficiency ofmetronidazole gradually decreased with the increase of the concentration of metronidazole; We alsoinvestigated the effect of initial concentration of metronidazole on the performance of electricity production,the maximum output voltage, output power gradually decreased with the increase of the concentration ofmetronidazole; It was also noteworthy that using1.0g/L glucose and10mg/L metronidazole as the fuel,the metronidazole was removed by almost85%, the maximum power density was99.23mW/m2at acurrentdensity of787.5mA/m2, this result indicated that the low concentration of metronidazole could be removed in MFCs at the same time producting electricity; SEM images further proved successful bacterialgrowth, and most bacteria are globar and arranged in chains on the carbon paper.2. The two-chambered MFC was used to treat the chloramphenicol-contained wastewater. It was foundthat the degradation of chloramphenicol due to the effect of microbial metabolism rather than celladsorption by comparing the MFC with traditional anaerobic and abiotic control group. Secondly we haveinvestigated the effect of initial concentration of chloramphenicol on the degradation effiency of MFC, wehave found that with the increase of concentration of chloramphenicol, wastewater degradation efficiencyobviously decreased. Finally, we examine the initial concentration of the substrate impact on the treatmenteffect, with the initial concentration of the substrate increasing, the chloramphenicol degradation efficiencyhave been improved. The degradation efficiency of chloramphenicol was only17%without of substrate,when the concentration of the substrste in the range of0.5-1.5g/L, the degradation efficiency ofchloramphenicol was maintained at78%-86%. Which have proved the degradation of chloramphenicolneeds glucose as co-substrates to provide electron of substrate (glucose).3. The two-chambered MFC was also used to treat sulfanilamide simulated wastewater. Weinvestigated the degradation efficiency of sulfanilamide and the performance of electricity generation,when using the glucose and sulfanilamide mixed solution as the fuel. The results showed that: the influentwas1.0g/L glucose and30mg/L sulfanilamide, the sulfanilamide was removed by almost90%, theglucose was removed by almost98%. We also investigated the effect of initial concentration ofsulfanilamide on the performance of electricity production, found that the addition of sulfanilamide couldenhance anodic polarization conditions, which result from power density, the maximum output voltagevalue and the stable time greatly improved.