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Improvement of trickling biofilter purification performance on treating chlorobenzene in waste gases using surfactant

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Journal of Shanghai University(English Edition) 2007年第6期11卷 607-612页

作者：刘强邓瑜衡 AR0WOLO E Babajide School of Environmental and Chemical Engineering Shanghai University

A laboratory-scale trickling biofilter column, filled with Raschig rings and inoculated with Pseudomonas putida （ATCC 1785） was used to ＇purify chlorobenzene contained waste gases. Sodium dodecyl sulfonate （SDS） was used to enhance the performance of trickling biofilter. Purification performance of the trickling biofilter was examined for chiorobenzene inlet concentration of 1.20,-5.04 g/m^3 at different EBRTs between 76N153 s. Without SDS addition, with simultaneous increase in chlorobenzene inlet loading rate and gas flow rate, 100% removal efficiency was achieved at EBRT of 109 s and inlet loadings below 5120 mg/m^3. Addition of SDS to nutrient solution led to improvement of trickling biofilter purification performance. By introducing 25 mg/L SDS, the removal efficiency was increased by 21% and elimination capacity up to 234 g/（m^3.h） was achieved at chlorobenzene inlet loading of 241 g/（m^3.h）. Although SDS concentration experienced a low rate reduction after continuous nutrient solution recirculation, this result has period little influence on trickling biofilter＇s removal efficiency in monitoring period.

关键词： trickling biofilter chlorobenzene surfactant sodium dodecyl sulfonate (SDS).

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Experimental study on toluene removal by a two-stage plasma-biofilter system

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Plasma Science and Technology 2022年第12期24卷 139-147页

作者： Hao HUANG Lihao HE Yuxuan WANG Liang CHEN Hui HU Mi ZHANG School of Environmental Science and Engineering Huazhong University of Science and TechnologyWuhan 430074People's Republic of China China-EU Institute for Clean and Renewable Energy Huazhong University of Science and TechnologyWuhan 430074People's Republic of China Nanjing Research Institute of Electronics Technology Nanjing 210039People's Republic of China Huawei Digital Power Technologies Co.Ltd. Shenzhen 518031People's Republic of China

Volatile organic compounds(VOCs) are typical pollutants that affect air *** plasma is thought to be a potential method that can remove VOCs from flue *** 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 *** 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 *** the optimal experimental conditions of pulse voltage 8.5 kV,initial toluene concentration 1400 mg m^(-3),and toluene flow rate of 121h^(-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 *** 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 CO_(2),H_(2)O,and some intermediate products such as o-diphenol under the influence of Acinetobacter *** the remaining waste gas passed through the discharge plasma reactor,the benzene ring structure could be directly destroyed by the collision between toluene and ***,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 ***,the two-stage plasma-biofilter system not only showed a high toluene removal efficiency,but also had a good energy *** results of this study will provide theoretical support and technical reference for industrial VOC treatment.

关键词： pulsed corona discharge VOCs purification trickling biofilter combined removal

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