Study On The Process And Mechanism Of Enhanced Degradation Of Organic Wastewater By Microbial Electric Fenton System

The microbial electric Fenton system is a kind of electric reaction that uses its own cathode to generate H2O2,and by adding a small amount of Fe2+,the Fenton reaction can occur,generating a large number of hydroxyl radicals(·OH),which have strong oxidizing properties.Degradation of organic wastewater.However,there are many factors influencing the microbial electric Fenton system,so this paper studies the effects of microbial electric Fenton system on the degradation of organic wastewater.The three-dimensional response surface analysis method is used to optimize the experimental reaction conditions,and the mathematical model is used to optimize the conditions.The study found that increasing the capacity of the cathode to produce hydrogen peroxide can greatly improve the ability of the microbial electric Fenton system to degrade organic polluted wastewater.Therefore,in Chapter 6 of this paper,we studied the modification of the cathode of the microbial electric Fenton system with a catalyst to improve its ability to degrade organic wastewater.The effects of two catalysts,functionalized carbon black and functionalized carbon nanotubes,on the cathode modification were studied.(1)The construction of the microbial electric Fenton system,the construction of the dual-chamber electric Fenton system,the construction of the microbial electric Fenton system is mainly the pre-cultivation of anode microorganisms,so that the electricity-producing microorganisms are enriched on the anode carbon fiber brush to form a stable organism Membrane,and can produce electricity stably,through microbial scanning electron microscopy and microbial high-throughput sequencing,analysis of anode microbial morphology,structure,and microbial community.(2)To study the influence of microbial electro-Fenton system on printing and dyeing wastewater(methyl orange printing and dyeing wastewater)under different conditions,mainly to study different applied voltages,different pHs,different Fe2+concentrations,different gas flows,different initial methyl orange concentrations,etc.Influence of factors on the systematic treatment of methyl orange printing and dyeing wastewater by microbial starch.Studies have shown that the treatment effect is best when the pH is 3,Fe2+(9 mM),applied voltage(0.6 V),methyl orange(60 mg·L-1),gas ventilation rate(12 mL·min-1).The degradation rate of orange is 93.8%,and the concentration of methyl orange is degraded from 60 mg·L-1 to 3.72 mg·L-1.(3)Using three-dimensional response surface analysis method,through condition optimization,design 44 sets of experiments,through 44 sets of experiments can optimize the best processing conditions,and through infrared analysis and liquid mass spectrometry analysis can be concluded that malachite green It is completely degraded under optimal conditions.Experimental conditions:pH 3,gas flow Q 16 ml·min-1,voltage 0.6 V,initial concentration 45 mg·L-1,Fe2+concentration 7.5 mM.Under this condition,the degradation rate of malachite green by the microbial electric Fenton system is 98%.(4)Using the microbial electric Fenton system to deeply process landfill leachate,the study found that the cathode can increase the amount of hydrogen peroxide produced,then the microbial electric Fenton system can achieve its ability to degrade landfill leachate.Therefore,the microbial electric Fenton cathode was modified to improve its ability to produce hydrogen peroxide.Functionalized carbon black and functionalized carbon nanotubes are the best choices,so these two catalysts are used to modify the cathode.The catalyst was loaded with 0.4 mg·cm-2,and functionalized carbon nanotubes(O-CNT)promoted the degradation rate of landfill leachate to 91%,and COD could eventually be degraded to 84 mg-L-1.