| Theoretical model for removal of volatile organic compound (VOC) air pollutant in trickling biofilter |
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| 作者姓名： | 廖强 陈蓉 朱恂 |
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| 作者单位： | Institute of Engineering Thermophysics，Chongqing University，Institute of Engineering Thermophysics，Chongqing University，Institute of Engineering Thermophysics，Chongqing University Chongqing 400044，China，Chongqing 400044，China，Chongqing 400044，China |
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| 基金项目： | This work was supported by the National Natural Science Foundation of China (Grant No. 50006015) the Key Research Project of Chongqing Science and Technology Committee (Grant No. 2001-6681) and the Applied Foundation Research Project of Chongqing Scien |
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| 摘 要： | Low concentration VOC waste gas and effluvial gas, emitted from the organic chemical plant, coal chemical plant, latex regeneration plant, paint spray booth, etc., have greatly polluted the at-mosphere and harmed people抯 health. The recovery of low concentration VOC waste gas is val-ueless and its treatment is very difficult and expensive. Therefore, the treatment of VOC waste gas is one of the difficult problems in environmental protection. The biological treatment technology of VOC was…
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| 收稿时间： | 3 January 2005 |
Theoretical model for removal of volatile organic compound (VOC) air pollutant in trickling biofilter |
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| Liao?Qiang?Email author,Chen?Rong,Zhu?Xun.Theoretical model for removal of volatile organic compound (VOC) air pollutant in trickling biofilter[J].Science in China(Technological Sciences),2003,46(3):245-258. |
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| Authors: | Email author" target="_blank">Liao?Qiang?Email author Chen?Rong Zhu?Xun |
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| Affiliation: | Institute of Engineering Thermophysics, Chongqing University, Chongqing 400044, China |
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| Abstract: | This paper presents an analytical model for predicting VOC waste gas degradation in a trickling biofilter. To facilitate the analysis, the packed bed is simplified into a series of straight capillary tubes covered by the biofilm. The gas-liquid flow field through the tube is divided into the liquid film flow on the biofilm and the gas core flow in the center. The biofilm consists of a reaction free zone close to solid wall and a reaction zone beneath the liquid film. The capillary tube model accounts for the effect of mass transport resistance in the liquid film and the biofilm, the gas-liquid interfacial mass transport resistance, the biochemical reaction, and the limitation of oxygen to biochemical reaction. The liquid film thickness in the capillary tube is obtained by simultaneously solving a set of hydrodynamic equations representing the momentum transport behaviors of the gas-liquid two-phase flow. The mass transport equations are established for gas core, liquid film, and biofilm combined with biochemical kinetics equations. An iterative computation process is employed to solve the discrete equations. The predicted purification efficiencies of VOC waste gas in trickling biofilter are found to be in good agreement with the experimental data. It has been revealed that for a fixed inlet concentration of toluene, the purification efficiency of trickling biofilter decreases with the increase in gas flow rate and liquid flow rate. The purification efficiency of VOC waste gas is dominated by mass transport resistance in liquid film and biofilm. The highest biodegradation rate occurs at the inlet of waste gas in trickling biofilter. |
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| Keywords: | trickling biofilter purification of low concentration VOC waste gas capillary tube model |
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