[Microorganisms oxidizing maleic acid in sewage]

The bacteria of genera Pseudomonas oxidizing maleic, fumaric, italic acids and their anhydrides in sewage of industry of maleic anhydride have been isolated from active sludge. During the autoselection a strain of P. stutzeri 832 capable to oxidize 12.5 - 25.0 g/l of maleic acid on 90 - 70% correspondingly in 3 days has been isolated. Destructive activity of isolated strain was retained after 5-year storage in lyophylized state and under vaseline oil.