复合催化膜生物反应器处理一氧化氮废气研究

Nitric Oxide Removal with a Fe-TiO_2/PSF Hybrid Catalytic Membrane Bioreactor

采用溶胶-凝胶法以聚砜(PSF)中空纤维膜为载体制备了Fe-Ti O_2/PSF复合催化膜,以此构建新型复合催化膜生物反应器(HCMBR),实现膜催化与硝化反硝化耦合烟气脱硝,进一步提高NO去除能力.采用Fe-Ti O_2/PSF复合催化膜生物反应器(HCMBR)处理一氧化氮废气,实现了180 d长时间高效稳定运行,NO去除效率可达93.2%,去除能力可达167.1g·(m^3·h)^(-1).适宜运行条件为:气体停留时间9 s、自然光光照强度670 lx,p H为6.8~7.2,n C/n N=3.7.Fe-Ti O_2/PSF复合催化膜加入,复合催化膜生物反应器去除NO的效率比膜生物反应器提高了1.4%~13%,在Fe-Ti O_2/PSF复合催化膜附着稳定的生物膜后,复合催化膜生物反应器去除NO的效率比湿式膜催化反应器提高了59.5%~66%.

The Fe-doped titanium dioxide（ Fe-Ti O_2） was prepared by the sol-gel method and was loaded on polysulfone（ PSF） hollow fiber membrane. A novel Fe-Ti O_2/PSF hybrid catalytic membrane biofilm reactor（ HCMBfR） was investigated for nitric oxide removal,to further improve the elimination capacity. HCMBfR exhibited a good stability in the 180-day operation period,the NO removal efficiency was up to 93. 2% and the maximum elimination capacity reached 167. 1 g·（ m^3·h）^（-1）. The additional use of the biofilm to wet Fe-Ti O_2/PSF membrane catalysis reactor led to the enhancement of NO removal efficiency from 59. 5% to 66%. The NO removal efficiency in the intimate coupling of Fe-Ti O_2/PSF hybrid catalytic membrane and biofilm reactor（ HCMBfR） increased from 1. 4% to13% as compared to that of the membrane biofilm reactor（ MBfR） only. The optimal illumination intensity,gas residence time,p H and n C/n N were 670 lx,9 s,6. 8-7. 2 and 3. 7,respectively.