固定化微生物两级还原耦合络合吸收工艺脱除NO_x的动力学研究  

Kinetics study on chelate absorption coupled with two-stage bio-reduction by immobilized microorganisms in NO_x removal

作　　者：林添明[1] 周作明[1] 荆国华[1] 

机构地区：[1]华侨大学化工学院,福建厦门361021

出　　处：《热力发电》2013年第8期49-54,共6页Thermal Power Generation

基　　金：国家自然科学基金(21077035);教育部"新世纪优秀人才支持计划"(NCET-11-0851);福建省高等学校新世纪优秀人才支持计划(11FJRC02)

摘　　要：分析了固定化微生物两级还原耦合络合吸收工艺脱除NOx的动力学过程,建立了生物反应器内固定化微生物还原Fe(Ⅱ)EDTA-NO和Fe(Ⅲ)EDTA的生化反应模型以及固定化生物小球的扩散-反应模型。分析结果表明:固定化反硝化菌还原Fe(Ⅱ)EDTA-NO的最大反应速度γmax为6.97×10-6 mmol/(m3·s-1),半饱和常数Km为0.001 6mmol/m3;固定化铁还原菌还原Fe(Ⅲ)EDTA的最大反应速度γ′max为6.805×10-5 mmol/(m3·s-1),半饱和速率常数K′m为0.013 73mmol/m3;Fe(Ⅱ)EDTA-NO和Fe(Ⅲ)EDTA的微生物还原过程均由内扩散控制,后期设计运用中应着力提高小球内反应物的扩散速率。The kinetic process of NOxremoval by employing an integrated process of metal chelate absorption coupled with two-stage bio-reduction using immobilized microorganisms was investigated.Several models were developed such as the bio-reduction of Fe(Ⅱ)EDTA-NO and Fe(Ⅲ)EDTA in immobilized microorganisms reactor and diffusion-reaction in immobilized beads.The results indicated that the maximum reaction rate of Fe(Ⅱ)EDTA-NO reduction by immobilized bacteria in bio-reactor was 6.97×10-6 mmol/(m3.s-1)and the half-saturation constant was 0.001 6mmol/m3.The maximum reaction rate of Fe(Ⅲ)EDTA reduction by immobilized bacteria in bio-reactor was 6.805×10-5 mmol/(m3.s-1)and the half-saturation constant was 0.013 73 mmol/m3.Furthermore,the bioreduction of Fe(Ⅱ)EDTA-NO and Fe(Ⅲ)EDTA were both controlled by interior diffusion.

关 键 词：烟气脱氮 固定化微生物 两级还原 络合吸收 扩散-反应 动力学 

分 类 号：X511[环境科学与工程—环境工程]