Study On Indoor Formaldehyde Waste Gas Treatment Using Dielectric Barrier Discharge Synergistic Adsorption

Indoor formaldehyde is one of the main pollutants in limited space air,which has certain harm to human health.Its treatment technology and research progress have been paid more attention.Traditional methods such as plant absorption,adsorption,and ozone oxidation are prone to secondary pollution,and the effect on low-concentration pollution is not obvious.One of the effective ways to control air pollution is non-thermal plasma technology,which is the main research target of environmental protection industry in the future.In this paper,the research on purifying simulated indoor formaldehyde exhaust gas by coaxial cylindrical dielectric barrier discharge non-thermal plasma technology is carried out.The purification effects of formaldehyde treatment by single dielectric barrier discharge,single adsorption and dielectric barrier discharge synergistic adsorption are compared and analyzed.The effects of discharge parameters,process parameters,electrode materials,adsorbents and other factors on the purification rate of formaldehyde were discussed.The comparison of the purification effects of the three treatment techniques shows that the synergistic technology can effectively improve the purification effect of the pollutant formaldehyde.The results showed that:（1）Purify the indoor formaldehyde exhaust gas by a single dielectric barrier discharge.In the selected parameter range,the discharge voltage increases,the effective discharge power increases,the formaldehyde purification rate increases,and the effective energy utilization rate increases first and then decreases,up to 0.04715mg·kJ^-1.Under the same conditions,the adsorption order of formaldehyde by four adsorbents is 4A-molecular sieve>γ-Al₂O₃>ceramic particle>ceramic raschig ring.（2）Using a one-stage packed bed coaxial cylindrical structure DBD reactor to simulate the simulated indoor formaldehyde exhaust gas,in the range of test parameters,the formaldehyde purification rate increases and then decreases with the increase of the discharge frequency,the gas flow rate and the initial concentration of gas is related to the purification rate of formaldehyde.When the background gas is air atmosphere,the addition of adsorbent can obviously improve the purification effect of formaldehyde.The purification rate of formaldehyde increases first and then decreases with the increase of the filled amount of adsorbent and there is an optimum peak value.（3）Orthogonal experiment was carried out on the optimalγ-Al₂O₃ adsorbent in combination with dielectric barrier discharge purification of formaldehyde.The order of influence on the formaldehyde purification rate in the selected parameters was discharge voltage>inlet flow rate>discharge frequency>effective discharge zone length>the amount of adsorbent filling.The optimal scheme of this test is discharge voltage 12kV,discharge frequency 130Hz,intake flow rate1.0L/min,effective discharge zone length 60mm,and adsorbent filled amount 28mL.Figure[51]Table[19]Reference[83]...