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›› 2007, Vol. 7 ›› Issue (2): 293-297.

• 反应与分离 • 上一篇    下一篇

生物过滤塔降解含乙苯废气动力学模型

王宝庆,马广大   

  1. 南开大学环境科学与工程学院
  • 出版日期:2007-04-20 发布日期:2007-04-20

The Biodegradation Kinetic Model of Ethylbenzene Waste Gas in Biofilters

WANG Bao-qing,MA Guang-da   

  1. Institute of Environmental Science and Engineering, Nankai University
  • Online:2007-04-20 Published:2007-04-20

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摘要： 以陶粒作为生物过滤床的填料净化含乙苯废气. 通过对乙苯降解过程的分析，在稳态条件下建立了生物膜内Dx微元上的物质平衡方程. 并通过适当假设条件，将模型进行简化求解，得出了零级反应方程及一级反应方程. 用实验数据对方程进行了拟合，结果表明，生物过滤塔对乙苯的生物降解过程为零级反应扩散限制过程. 以葡萄球菌(Staphylococcus)为乙苯降解菌，停留时间大于28.3 s、气体流量小于1 m3/h、入口浓度小于6500 mg/m3时，用实验数据回归得出了bQgCg,in1/2=19.22. 用该方程，针对不同的入口浓度Cg,in，在一定的气速条件下可得出相应的b值，将其代入方程Cg(h)=Cg,in(1-bh)2，可计算出生物过滤塔不同高度处的出口浓度Cg(h)值. 该方程对于实际应用具有指导意义.

关键词: 生物过滤塔, 含乙苯废气, 动力学模型

Abstract: An experimental investigation on purification of ethylbenzene waste gas is conducted in a biofilter packed with ceramic pellets. The biofiltration model is derived from a mass balance based on diffusion and biodegradation reaction of ethylbenzene. The results show that the zero order biodegradation kinetic model in the case of diffusion limitation within the biofilm fits the experimental results well. The bQgCg,in1/2 is equal to a constant of 19.22 under the conditions of Staphylococcus as biodegradation bacteria, residence time more than 28.3 s, gas flowrate less than 1.0 m3/h, inlet concentration less than 6500 mg/m3. The value of b could be obtained from above equation if the values of Cg,in and Qg are given. Then Cg(h) could be calculated from the equation of Cg(h)=Cg,in(1-bh)2. Therefore, it is significant that the obtained equation can offer a reference for design of biofiter.

Key words: biofilter, ethylbenzene waste gas, kinetic model