络合吸收脱除NO体系中Fe^Ⅲ（EDTA）的生物还原  

Microbial Reduction of FeⅢ (EDTA) in the System of Nitric Oxide Removal by Metal Chelate Absorption

作　　者：荆国华[1] 李伟[1] 施耀[1] 周作明[2] 

机构地区：[1]浙江大学环境工程研究所,杭州310027 [2]华侨大学环境工程系,泉州362021

出　　处：《环境科学》2005年第6期19-23,共5页Environmental Science

基　　金：国家自然科学基金项目(20176052)

摘　　要：利用驯化得到的微生物还原FeⅢ(EDTA)的研究结果表明,葡萄糖比乙醇和甲醇更适合于作为该体系的碳源;由于硝酸盐在反应过程中对FeⅢ(EDTA)的微生物还原形成抑制,选择铵盐为微生物生长的氮源;反应最适pH值范围为6～7;温度在30℃～40℃范围之间变化,FeⅢ(EDTA)还原率相差不大,温度大于40℃以后,还原率随温度升高而下降.碳源量和菌体接种量满足还原反应需要即可,过量碳源或菌体接种量对还原率没有明显的促进作用.在实验考察的浓度范围内,FeⅢ(EDTA)的生物还原符合1级反应动力学,最大反应速率γmax=1.3 mmol·(L·h),半饱和速率常数km=53.5 mmol·L-1.Reduction of Fe^Ⅲ （EDTA） with cultivated microorganisms in the system of nitric oxide removal by metal chelate absorption was investigated. Supplemental glucose stimulates the formation of Fe^Ⅲ （EDTA） more than ethanol and methanol as the carbon sources. Ammonium salt was used to be as the nitric source instead of nitrate, which inhibits the reduction of Fe^Ⅲ （EDTA） due to the competition between the two electron acceptors. The optimal pH value was from 6 to 7. The reduction percentage of Fe^Ⅲ （EDTA） varied little with the range of 30℃ -40℃ and decreased quickly with a temperature higher than 40℃. The bio-reduction could be achieved efficiently with enough carbon source and cell inoculation. The reduction rate did not increase with adding more amount of carbon source or cell inoculation. The bio-reduction rate could be described by Michaelis-Menten equation and fitted to the first order reaction kinetics. The maximum reaction rates γmax and the Michaelis constant km were 1.3 mmol· （ L· h）^ - 1 and 53.5 mmol· L^-1 respectively.

关 键 词：Fe^Ⅲ(EDTA) 生物还原 NOx 烟气脱氮 

分 类 号：X701[环境科学与工程—环境工程]