生物滴滤塔去除高浓度H_(2)S废气的模拟研究  

Simulation study on the removal of high concentration H_(2)S waste gas by biotrickling filter

作　　者：谢乐 蒋崇文[1] XIE Le;JIANG Chongwen(College of Chemistry and Chemical Engineering,Central South University,Changsha 410083,Hunan,China)

机构地区：[1]中南大学化学化工学院,湖南长沙410083

出　　处：《化工学报》2021年第8期4346-4353,共8页CIESC Journal

基　　金：湖南省自然科学基金项目(2018JJ2482)。

摘　　要：以生物滴滤塔(BTF)去除高浓度H_(2)S废气为研究对象,建立了一维轴向扩散反应器模型和双基质生物降解反应动力学模型,通过比较单基质模型和双基质模型在不同H_(2)S入口浓度条件下的模拟结果和实验结果,验证了双基质模型的有效性和可行性,研究了生物膜中H_(2)S的动态去除过程,考察了BTF在不同液相H_(2)S浓度和空床停留时间条件下的除臭性能。研究表明,当生物膜表面H_(2)S浓度为7589.3 mg/m3时,生物膜中传质-生物降解过程需要0.75 s才能达到稳态;较厚的生物膜使得内扩散阻力增大,生物降解反应速率分布的不均匀性增大,O2浓度对生物降解速率的影响将越来越显著;进气速度和喷淋浓度可显著影响BTF中H_(2)S的去除率。In this study,a one-dimensional axial dispersion reactor model and a two-substrate biodegradation kinetic model were established for the removal of high concentration H_(2)S waste gas by biotrickling filter(BTF).The simulation results of one-substrate model and two-substrate model were compared with each other under different inlet H_(2)S concentrations,proving the validity and feasibility of the two-substrate model.Then the dynamic removal process of H_(2)S in the biofilm was investigated.Furthermore,the two-substrate model was applied to investigate the deodorization performance of BTF under varying liquid phase H_(2)S concentrations and empty bed retention time.Studies have shown that when the H_(2)S concentration on the surface of the biofilm is 7589.3 mg/m3,the mass transfer-biodegradation process in the biofilm needs 0.75 s to reach a steady state.A thicker biofilm may lead to an increase of the internal diffusion resistance and the nonuniformity of biodegradation rate.Thus,the O2 concentration has a significant effect on the biodegradation rate.The inlet velocity and spray concentration can significantly affect the removal rate of H_(2)S in BTF.

关 键 词：生物滴滤塔 硫化氢 传质 模型 反应工程 

分 类 号：TQ031[化学工程]