生物滴滤床对H_2S废气的去除效率研究

本试验采用生物滴滤床(BTF)工艺净化制药厂污水站H2S废气。装置采用实验室分离纯化的菌种经现场培养扩增后所得的高浓度混合菌菌液,在8d内迅速完成启动;试验过程H2S气量为11.3m3/h,平均浓度为385.6mg/m3,平均空床停留时间(EBRT)为13.5s,H2S的平均去除效率96%,且去除率稳定。随着污染物在BTF内EBRT的减少,去除率逐渐减小;H2S去除负荷极限ECmax为209.6g/(m3.h),且80%的去除负荷由填料床的下层承担;增加液体喷淋量有助于强化处理效果,但液膜厚度对净化效率有着负面影响,循环液中的SO42-累积浓度>28g/L时,去除率低于90%。试验结果表明,BTF系统运行稳定,适应性好,应用于工业废气处理是可行的。

STUDY ON REMOVAL EFFICIENCY OF PURIFYING HYDROGEN SULFIDE IN BIOTRICKLING FILTER

A biotrickling filter is used to do a test of purifying H_2S emissions from pharmaceutical factory.The outfit uses highly concentrated mix fungus which is separated and purified in the laboratory and raise to extend in field-pilot,rapidly completes the startup in 8 days; The air flow of biotrickling filter (BTF) is 11.3 m~3/h, the average density is 385.6 mg/m~3 ,the average empty-bed residence time (EBRT) is 13.5 s ,the H_2S removal efficiency(RE) reached 96%,and the RE is steady.With pollutant reducing the EBRT in BTF,RE is reduced gradually; the EC_ max of BTF is 209.6 g/(m~3·h) ,and about 80% is undertaken by the lower floor of packing. To increase liquid quantity is helpful to improve removal effect,but the thickness of fluid film has negative influence to the RE.When the SO~ 2-_4 density of BTF accumulate more than 28 g/L ,RE is less than 90%.The results show that the BTF system runs steadily and adapts well,which is feasible to purify industrial waste gases.