生物过滤塔降解含乙苯废气动力学模型  

The Biodegradation Kinetic Model of Ethylbenzene Waste Gas in Biofilters

作　　者：王宝庆[1] 马广大[2] 

机构地区：[1]南开大学环境科学与工程学院,天津300071 [2]西安建筑科技大学环境与市政工程学院,陕西西安710055

出　　处：《过程工程学报》2007年第2期293-297,共5页The Chinese Journal of Process Engineering

基　　金：陕西省教育厅专项科研计划基金(编号:01JK186);南开大学科研启动基金(编号:J02012)

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Δx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 m^3/h、入口浓度小于6500 mg/m^3时,用实验数据回归得出了βQ_gC_(g,in)^(1/2)=19．22．利用该方程,针对不同的入口浓度C_(g,in),在一定的气速条件下可得出相应的β值,将其代入方程C_(g(h))=C_(g,in)(1-βh)~2,可计算出生物过滤塔不同高度处的出口浓度C_(g(h))值．该方程对于实际应用具有指导意义．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 βQgCg,in^1/2 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 m^3/h, inlet concentration less than 6500 mg/m^3. The value of fl 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-βh）^2. Therefore, it is significant that the obtained equation can offer a reference for design of biofiter.

关 键 词：生物过滤塔 含乙苯废气 动力学模型 

分 类 号：X701[环境科学与工程—环境工程]