Abstract: Ferrous chelate absorption is deemed a promising method for NO removal from flue gas, but the key problem is the difficulty to regenerate the absorption solution, i.e. the complexes of Fe^II(EDTA)NO and Fe^III(EDTA) in the solution. Two bacterial strains isolated recently from the sludge of the denitrification step of a municipal wastewater treatment plant could be applied effectively to regenerate the absorbent were Pseudomonas sp. and klebsiella trevisan sp. Pseudomonas sp. exhibited high reduction ability on Fe^II(EDTA)NO and the klebsiella trevisan sp. was more suitable for Fe^III(EDTA) reduction.

Key words: Microorganism, NO_x, Fe^II(EDTA)NO, Fe^III(EDTA)

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