Mn₃O₄ Coating Enhanced Low-temperature Plasma Regeneration Of Wasted Activated Carbon

The amount of waste activated carbon produced in my country is increasing year by year.Improper disposal of waste activated carbon can easily form secondary solid（dangerous）waste,causing environmental pollution and waste of renewable resources.Low-temperature plasma regeneration treatment of waste activated carbon has the characteristics of short time,high efficiency,and simple process flow.However,there are still problems such as high energy consumption and processing efficiency to be improved.Based on the shortcomings in the regeneration treatment of waste activated carbon by low-temperature plasma technology,this paper applies Mn₃O₄coating to self-made low-temperature plasma reactor electrodes,and carries out research on the regeneration and treatment of waste activated carbon by dielectric barrier and Mn₃O₄catalytic technology,which is the disposal and resource utilization of waste activated carbon.provide technical support.In order to explore the influence of Mn₃O₄coating on plasma discharge performance,the changes of plasma discharge mode,discharge power and energy density before and after Mn₃O₄coating were compared and analyzed,and the activity of Mn₃O₄on the reaction system O₃,·OH during the discharge process was analyzed.The impact of particles.In order to study the energy efficiency of Mn₃O₄coating-assisted enhancement of low-temperature plasma regeneration of waste activated carbon,it was investigated to obtain suitable discharge conditions for the degradation of toluene at different discharge voltages,discharge times and air flow rates;the effects of regeneration times and activated carbon loss on the adsorption performance of waste activated carbon were investigated.It shows that VOCs,CO₂,O₃and other substances in the discharge system change and transform under different discharge voltages and different air flow rates.In order to realize the promotion of Mn₃O₄coating-assisted intensified low-temperature plasma regeneration treatment of industrial waste activated carbon,carry out the application research of regenerating waste activated carbon for organic waste gas and organic wastewater,analyze the degradation products of organic pollutants adsorbed by waste activated carbon with the help of GCMS,and analyze the regeneration process Energy consumption,to prove the energy efficiency of organic waste activated carbon regeneration in industrial applications.The results show:（1）The electrical performance analysis of Mn₃O₄coated low temperature plasma reactor electrode found that the discharge waveform of Mn₃O₄coating is sinusoidal and has burrs,indicating that Mn₃O₄coating will not affect the dielectric barrier discharge mode;when the voltage is 12kV,Mn₃O₄The discharge power of coating mode is 88.05W,which is 11.44%lower than that of No Load;the energy density is10566.16J/L,which is 1364.56J/L lower than that of No Load,indicating that Mn₃O₄coating can effectively reduce the energy consumption of plasma discharge.Analyzing the active particles during the auxiliary discharge process of Mn₃O₄coating,it is found that when the discharge voltage is 13kV,the maximum O₃concentration is826.13mg/m3;when the air flow rate is 0.5L/min,the O₃concentration decreases the most,with a decrease of 105.42mg/m3.When the discharge voltage is 12kV,the air flow rate is 0.5L/min,and·OH concentration is 2.54mg/L,which is 3.10 times that of No Load,indicating that Mn₃O₄coating improve the low-temperature plasma technology to regenerate waste activated carbon.（2）Regeneration treatment and adsorption of toluene waste activated carbon carbon found that when the discharge voltage is 12kV,the discharge time is 30min,and the air flow rate is 0.5L/min,the degradation efficiency of toluene adsorbed by the Mn₃O₄coating on the waste activated carbon is 99.78%,which is higher than21.07%higher;VOCs concentration and CO₂concentration first increase and then decrease with time.The greater the discharge voltage,the faster the concentration rises.When the voltage is 13kV,the maximum VOCs concentration is 182.25mg/m³,and the CO₂concentration is 9034.28mg/m³.When the air flow rate is 0.5L/min,the VOCs decline rate and the CO₂growth rate are the fastest,and the concentration drops to 0mg/m³at28.43min;5 times of regeneration,the activated carbon loss rate increases from12.45%to 18.30%,and the regeneration adsorption efficiency.The decrease from95.44%to 83.64%.It indicates that the loss of activated carbon has affected the adsorption effect,and the degradation rate of toluene has dropped from 99.74%to99.24%.It shows that Mn₃O₄coating is helpful to realize the regeneration and utilization of waste activated carbon.（3）Mn₃O₄coating enhanced low-temperature plasma regeneration treatment of industrial waste activated carbon found that when the discharge voltage is 12kV,the discharge time is 30min,and the air flow rate is 0.5L/min,the degradation rate of n-nonane in the industrial waste gas activated carbon is 88.02%,and the degradation rate of toluene is 88.02%.97.21%,biphenyl degradation rate 72.84%,caprolactam degradation rate 67.26%;discharge voltage 12kV,discharge time 30min,air flow rate is 0.3L/min,dodecane degradation rate in industrial organic wastewater is 99.42%,caprolactam degradation rate is 99.23%.（4）Comparing the product comparison before and after industrial waste activated carbon regeneration treatment,Tianyuan VOCs,Jinfeng VOCs,Tianyuan sewage industrial waste activated carbon regeneration treatment,no secondary intermediate products were produced,and the process energy efficiency was 6.13g/k Wh,5.36g/k Wh and 3.44g/k Wh,indicating that Mn₃O₄coating enhanced low-temperature plasma discharge has a good removal effect on the treatment of exhaust gas and wastewater activated carbon,and can realize the regeneration treatment of waste activated carbon.