新型聚乙烯填料生物滴滤床净化硫化氢气体的启动研究

研究了新型高密度聚乙烯改良型拉西环填料生物滴滤床净化硫化氢气体的启动过程,重点比较了启动过程中不同的挂膜方式对启动时间及效能的影响.结果表明,采用液相连续流强化挂膜法成膜时间短,在环境温度20～28℃时7 d可以挂膜成功.在启动过程中,随着工艺参数的突然改变(GRT缩短)和入口浓度波动,液相连续流强化挂膜后反应器的硫化氢去除率更稳定.在进气浓度最高为343 mg/m³时硫化氢去除率稳定在95%以上.试验过程中还发现,将SO₄^2-浓度作为活性污泥驯化完成的监测指标、液相S^2-去除率作为挂膜完成的监测指标更合理.启动结束后,通过2种途径减去喷淋液中的碳源并未影响硫化氢的去除率,这进一步表明生物滴滤床中硫化氢的净化主要由自养菌完成.

Study on the Start-up of an Innovative Polyethylene Carrier Biotrickling Filter Treating Waste Gas Containing Hydrogen Sulphide

Start-up of an innovative biotrickling bed packed with high density polyethylene carrier was studied. Two biofilm formation methods, continuous liquid stream (CLS) and gas-liquid phase joint (GLJ) biofilm formation, were studied for a quick start-up of biotrickling bed reactor treating gaseous hydrogen sulfide. Results show that the start-up time of the former is shorter, i. e. about 7 d at temperature 20- 28 degrees C . More steady performance was found in the reactor with CLS biofilm formation when sudden changes of GRT and inlet sulfide concentration happened. The removal efficiency of the former kept above 95% when inlet hydrogen sulphide concentration below 343 mg/m(3). Furthermore, the removal efficiency of S2- from the liquid used as the monitoring parameter of biofilm formation is suggested. After start-up period accomplished, no notable influence observed on removal efficiency when reducing supply of carbon source in trickling liquid through two different methods. The results show that the elimination of hydrogen sulphide in waste gas mainly attributed to autotrophic bacteria.