Experimental study on the inhibition of biological reduction of Fe(III)EDTA in NO(x) absorption solution.
Scrubbing of NO(x) from the gas phase with Fe(II)EDTA has been shown to be highly effective. A new biological method can be used to convert NO to N(2) and regenerate the chelating agent Fe(II)EDTA for continuous NO absorption. The core of this biological regeneration is how to effectively simultaneous reduce Fe(III)EDTA and Fe(II)EDTA-NO, two mainly products in the ferrous chelate absorption solution. The biological reduction rate of Fe(III)EDTA plays a main role for the NO(x) removal efficiency. In this paper, a bacterial strain identified as Klebsiella Trevisan sp. was used to demonstrate an inhibition of Fe(III)EDTA reduction in the presence of Fe(II)EDTA-NO. The competitive inhibition experiments indicted that Fe(II)EDTA-NO inhibited not only the growth rate of the iron-reduction bacterial strain but also the Fe(III)EDTA reduction rate. Cell growth rate and Fe(III)EDTA reduction rate decreased with increasing Fe(II)EDTA-NO concentration in the solution.
Li
Wei
W
Institute of Environmental Engineering, Zhejiang University, Hangzhou 310027, China.
Wu
Cheng-Zhi
CZ
Zhang
Shi-Han
SH
Shi
Yao
Y
Lei
Le-Cheng
LC
D000327:Adsorption; D002614:Chelating Agents / Q000378:metabolism*; D004492:Edetic Acid / Q000037:antagonists & inhibitors / Q000378:metabolism; D005290:Ferric Compounds / Q000037:antagonists & inhibitors / Q000378:metabolism*; D007501:Iron / Q000378:metabolism*; D007709:Klebsiella / Q000254:growth & development / Q000378:metabolism*; D009589:Nitrogen Oxides / Q000378:metabolism*; D010084:Oxidation-Reduction
D002614:Chelating Agents; D005290:Ferric Compounds; D009589:Nitrogen Oxides; D004492:Edetic Acid; D007501:Iron; C019179:Fe(III)-EDTA