Study On Degradation Of Pollutants In MFC And Hydrogen Generation In MEC

Energy has been the material basis of human survival and development,But a lot of consumption of fossil fuels will cause a series of environmental problems.So it will be the future trend of energy development that looking for an efficient and environmentally friendly new clean energy alternative to traditional fossil fuels.Biomass is an abundant renewable resource,but the utilization rate is less than 5%.Microbial fuel cell,as a source of biomass energy,is a kind of chemical energy into electrical energy new technology,This technology have not only mild operating conditions,but also a wide range of"fuel"source.More importantly,it is efficient,clean,safe,good continuity,and it has broad prospects for development.In recent years,it has become the focus of international research.Coking wastewater is a highly toxic,biodegradable industrial waste water which is rich in a large number of phenols,ammonia,sulfides and other pollutants.Since the status of China's industrial development to produce large amounts of toxic waste and other hard coking degradation of industrial wastewater,which caused a lot of pressure on the environment.How to deal with industrial waste is a big industry problem.Conventional waste water treatment is not only to bring economic pressure and easy to produce secondary pollutants.MFC wastewater treatment has high efficient and it can be wastewater chemical energy into electrical energy.So it hidden potential economic benefits.In this paper,microbial fuel cell technology is used.In the third chapter,coking wastewater bacteria is used as biological catalyst for degradation of phenol,ammonia and sulfides and contrast their electricity production performance and analysis and comparison of three electricity producing bacteria by the MFC electricity production by bacteria differences 16s rRNA sequencing.In the fourth chapter,coking wastewater bacteria is used as biological catalyst for MEC hydrogen production.In an external 0.5V,0.7V,0.9V voltage,compared the electrolytic hydrogen production performance while comparing the differences between MEC anode bacteria and raw coking wastewater bacteria.Coking wastewater bacteria as biocatalysts are degradation of phenol,ammonia and sulfides.Its main conclusions are as follows:When using glucose as the matrix domestication to generate mature biofilm.Replace the substrate is glucose and ammonia(phenol sulfide)and domesticated online according to certain gradient.Eventual replacement pure toxic substances domesticated.After acclimation anti-toxic bacteria produce electricity to be screened separately.Three cell output power are gradually increased and the maximum power of the final stable were 697 mW/m~2(1868 mA/m~2),324 mW/m~2(579 mA/m~2)and 1215mW/m~2(3470 mA/m~2).By cyclic voltammetry test match find that ammonia MFC and phenol MFC have redox peaks,but sulfide MFC have no redox peaks.Graphics were leaf-shaped.This may be ammonia MFC and phenol MFC were screened out their strengths bacteria itself to produce intermediate which are used to transmit electronic while sulfide MFC can not produce intermediate.By contrast impedance,the final three sets of battery internal resistance are 168.55?,425.49?and 89.39?.The resistance of sulfide MFC is minimized.Chronoamperometry figure shows sulfide MFC have higher current,ammonia MFC and phenol MFC have lower current.Tafel analysis shows the exchange current density of the order are sulphide MFC>ammonia MFC>phenol MFC.Ammonium chloride MFC anode carbon felt produced mainly electrical bacteria:Pseudomonas,Clostridium,Bacteroides leaf.Phenol MFC anode carbon felt produced mainly electrical bacteria:comamonas bacterium,red fungus,flavobacterium.Sulfide MFC anode carbon felt mainly electricity bacteria:Bacillus,Brucella.This shows that tuberculosis is an effective bacteria produce electricity and it has strong anti-toxic.Coking wastewater bacteria as biological catalyst for MEC hydrogen production.Its main conclusions are as follows:External 0.5V,0.7V,0.9V voltage were used to compare the performance of hydrogen production in MEC eperiments.It find that MEC can produce hydrogen under 0.5V voltage,but hydrogen yield is small.MEC can effectively produce hydrogen under o.7V and0.9V voltage.Compared with the electrolyzed water with the theoretical minimum voltage of 1.23V,it has been greatly improved.It will produce a certain amount of methane gas under the 0.5V and 0.7V voltage,but it produce no methane gas basically under 0.9V voltage.This shows It can suppress the generation of methane gas under 0.9V voltage.By metagenomic sequencing 16S rRNA analysis and SEM analysis find a large number of rice-like and end to end cable bacteria after MEC domesticated.The bacterium belongs to the family of bacteria Desulfobulbaceae.Such bacteria can utilize oxygen and sulfide metabolites to produce electricity.