Volatile organic compounds(VOCs)are typical pollutants that affect air quality.Discharge plasma is thought to be a potential method that can remove VOCs from flue gas.In this experiment,pulsed corona discharge plasma combined with a biological tower was carried out to remove the benzene series,and toluene was selected as the typical VOC.The results indicated that the removal efficiency of toluene by pulsed corona plasma was slightly higher than that of direct current(DC)corona plasma,while its energy efficiency was much higher than DC corona plasma.Under the optimal experimental conditions of pulse voltage 8.5 kV,initial toluene concentration 1400 mg m-3,and toluene flow rate of 121 h-1,the toluene removal efficiency reached 77.11％by the single method of pulsed corona discharge plasma,and the energy efficiency was up to 1.515 g/(kW·h)under the pulse voltage of 4.0 kV.The trickling biofilter was constructed by using the screened and domesticated Acinetobacter baumannii,and the highest toluene removal efficiency by the pulsed corona discharge plasma combined with the trickling biofilter rose up to 97.84％.Part of the toluene was degraded into CO2,H2O,and some intermediate products such as o-diphenol under the influence of Acinetobacter baumannii.When the remaining waste gas passed through the discharge plasma reactor,the benzene ring structure could be directly destroyed by the collision between toluene and plasma.Meanwhile,O·,OH,and some other oxidizing radicals generated by the discharge also join into the oxidative decomposition of toluene and its intermediate products,thereby further improving the removal efficiency of toluene.Therefore,the two-stage plasma-biofilter system not only showed a high toluene removal efficiency,but also had a good energy efficiency.The results of this study will provide theoretical support and technical reference for industrial VOC treatment.

Hao HUANG;Lihao HE;Yuxuan WANG;Liang CHEN;Hui HU;Mi ZHANG

School of Environmental Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,People's Republic of China;China-EU Institute for Clean and Renewable Energy,Huazhong University of Science and Technology,Wuhan 430074,People's Republic of China;Nanjing Research Institute of Electronics Technology,Nanjing 210039,People's Republic of China;Huawei Digital Power Technologies Co.Ltd.,Shenzhen 518031,People's Republic of China

等离子体科学和技术（英文版）

[1]Hao HUANG;Lihao HE;Yuxuan WANG;Liang CHEN;Hui HU;Mi ZHANG-.Experimental study on toluene removal by a two-stage plasma-biofilter system)[J].等离子体科学和技术（英文版）,2022(12):125-133

biofilter,trickling,diphenol

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