Removal of Nitrogen oxides from Tail Gases by Immobilized Microorganisms Technology
As we all know, nitrogen oxides(NOx) are important air pollutants, which not only are harmful to human body, but also cause acid rain or photochemical smog. This paper deals with the removal of nitrogen oxides from tail gases by immobilized microorganisms, nitrifying bacteria and denitrifying bacteria from activated sludge in sewage treatment plant are co-immobilized by adopting different materials, which including the agar, activated carbon, PVA and sodium alginate etc., the effects of different methods of immobilization on NOx removal rate are studied, the results show that immobilized microorganisms using activated carbon as carrier is superior to the other immobilization methods, the maximum NOx removal rate of 95.62％ is obtained and the outlet NOx concentration is lower than 100mg/m3;in addition, the mass transfer mechanism of NOx in bio-filter is also investigated;the results show that the NOx liquidphase mass transfer rate is faster than biochemistry reaction rate, majority of NOx transfer into liquid phase and are degraded by microorganisms in liquid phase, the influence of residence time on NOx removal rate is also researched, the optimal residence time is about 7s.
Nitrogen oxides removal immobilized microorganisms activated carbon
REN Xiaoli ZHU Kaijin ZHAO Kunzhu
Department of Environmental and safety Engineering，Taiyuan Institute of Technology
国际会议
The 6th International Symposium of Asia Institute of Urban Environment(亚洲城市环境学会第六届国际会议)
长春
英文
775-778
2009-09-20（万方平台首次上网日期，不代表论文的发表时间）