CIESC Journal ›› 2021, Vol. 72 ›› Issue (8): 4346-4353.DOI: 10.11949/0438-1157.20201672

• Energy and environmental engineering • Previous Articles     Next Articles

Simulation study on the removal of high concentration H2S waste gas by biotrickling filter

Le XIE(),Chongwen JIANG()   

  1. College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, Hunan, China
  • Received:2020-11-19 Revised:2021-02-17 Online:2021-08-05 Published:2021-08-05
  • Contact: Chongwen JIANG

生物滴滤塔去除高浓度H2S废气的模拟研究

谢乐(),蒋崇文()   

  1. 中南大学化学化工学院,湖南 长沙 410083
  • 通讯作者: 蒋崇文
  • 作者简介:谢乐(1989—),男,博士,讲师,xiele2018@csu.edu.cn
  • 基金资助:
    湖南省自然科学基金项目(2018JJ2482)

Abstract:

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 H2S 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 H2S concentrations, proving the validity and feasibility of the two-substrate model. Then the dynamic removal process of H2S in the biofilm was investigated. Furthermore, the two-substrate model was applied to investigate the deodorization performance of BTF under varying liquid phase H2S concentrations and empty bed retention time. Studies have shown that when the H2S 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 H2S in BTF.

Key words: biotrickling filter, hydrogen sulfide, mass transfer, model, reaction engineering

摘要:

以生物滴滤塔(BTF)去除高浓度H2S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H2S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H2S的动态去除过程,考察了BTF在不同液相H2S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H2S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H2S的去除率。

关键词: 生物滴滤塔, 硫化氢, 传质, 模型, 反应工程

CLC Number: