摘要
本文在生物膜滴滤塔废气净化的毛细管模型基础上,研究了气、液两相流量、填料的比表面积、孔隙率、生物膜覆盖率和甲苯进口浓度等参数对生物滴滤塔净化效率的影响。计算结果表明:随着气、液流量的增加,降解效率降低;当孔隙率一定,随着填料的比表面积增大,降解效率升高;当填料比表面积一定时,存在一个对应于最大净化效率的最佳孔隙率;生物膜覆盖率越大,净化效率也越高;随着甲苯进口浓度升高,净化效率降低;填料床越高,净化效率越高。
A capillary tube model is established to study the purification efficiency of biotrickling bed for VOC waste gas. The mass diffusion coefficient is modified by the tortosity of porous bed. Based on this model, the effects of gas flux, fluid flux, the specific surface area and porosity of packed material, the coverage fraction of biofilm, the toluene inlet concentration, and the height of packing bed on purification efficiency are theoretically investigated, respectively. The computed results show that the purification efficiency decreases with the increases of liquid flux and gas flux. For a fixed porosity of packed material, a larger specific surface area leads to higher purification efficiency. Under a specific surface area of packed material, there exists an optimum porosity corresponding to the highest purification efficiency. As the coverage fraction of biofilm and the height of packing bed increasing, the purification efficiency increases. A higher inlet concentration of toluene and shorter packed bed induce less purification efficiency.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2005年第1期122-124,共3页
Journal of Engineering Thermophysics
基金
国家自然科学基金资助项目(No.50006015)重庆市科技攻关项目(No.2001-6681)重庆市应用基础研究项目(No.2001-6877)
