Regeneration of nitric oxide chelate absorption solution by two heterotrophic bacterial strains.

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) re-duction.